Re: [PATCH 02/16] mfd: madera: Add common support for Cirrus Logic Madera codecs

[Lee Jones <lee.jones@xxxxxxxxxx>]

On Wed, 05 Apr 2017, Richard Fitzgerald wrote:

> This adds the generic core support for Cirrus Logic "Madera" class codecs.
> These are complex audio codec SoCs with a variety of digital and analogue
> I/O, onboard audio processing and DSPs, and other features.
> 
> These codecs are all based off a common set of hardware IP so can be
> supported by a core of common code (with a few minor device-to-device
> variations).
> 
> Signed-off-by: Charles Keepax <ckeepax@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
> Signed-off-by: Nikesh Oswal <Nikesh.Oswal@xxxxxxxxxxxxxxxx>
> Signed-off-by: Richard Fitzgerald <rf@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
> ---
>  Documentation/devicetree/bindings/mfd/madera.txt |  79 +++
>  MAINTAINERS                                      |   3 +
>  drivers/mfd/Kconfig                              |  23 +
>  drivers/mfd/Makefile                             |   4 +
>  drivers/mfd/madera-core.c                        | 689 +++++++++++++++++++++++
>  drivers/mfd/madera-i2c.c                         | 130 +++++
>  drivers/mfd/madera-spi.c                         | 131 +++++
>  drivers/mfd/madera.h                             |  52 ++
>  include/linux/mfd/madera/core.h                  | 175 ++++++
>  include/linux/mfd/madera/pdata.h                 |  88 +++
>  10 files changed, 1374 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/mfd/madera.txt
>  create mode 100644 drivers/mfd/madera-core.c
>  create mode 100644 drivers/mfd/madera-i2c.c
>  create mode 100644 drivers/mfd/madera-spi.c
>  create mode 100644 drivers/mfd/madera.h
>  create mode 100644 include/linux/mfd/madera/core.h
>  create mode 100644 include/linux/mfd/madera/pdata.h
> 
> diff --git a/Documentation/devicetree/bindings/mfd/madera.txt b/Documentation/devicetree/bindings/mfd/madera.txt
> new file mode 100644
> index 0000000..a6c3260
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mfd/madera.txt
> @@ -0,0 +1,79 @@
> +Cirrus Logic Madera class audio codecs multi-function device
> +
> +These devices are audio SoCs with extensive digital capabilities and a range
> +of analogue I/O.
> +
> +See also the child driver bindings in:
> +bindings/extcon/extcon-madera.txt
> +bindings/gpio/gpio-madera.txt
> +bindings/interrupt-controller/cirrus,madera.txt
> +bindings/pinctrl/cirrus,madera-pinctrl.txt
> +bindings/regulator/madera-ldo1.txt
> +bindings/regulator/madera-micsupp.txt
> +bindings/sound/madera.txt
> +
> +Required properties:
> +
> +  - compatible : One of the following chip-specific strings:
> +        "cirrus,cs47l35"
> +        "cirrus,cs47l85"
> +        "cirrus,cs47l90"
> +        "cirrus,cs47l91"
> +        "cirrus,wm1840"
> +
> +  - reg : I2C slave address when connected using I2C, chip select number when
> +    using SPI.
> +
> +  - DCVDD-supply : Power supply for the device as defined in
> +    bindings/regulator/regulator.txt
> +    Mandatory on CS47L35, CS47L90, CS47L91
> +    Optional on CS47L85, WM1840
> +
> +  - AVDD-supply, DBVDD1-supply, DBVDD2-supply, CPVDD1-supply, CPVDD2-supply :
> +    Power supplies for the device
> +
> +  - DBVDD3-supply, DBVDD4-supply : Power supplies for the device
> +    (CS47L85, CS47L90, CS47L91, WM1840)
> +
> +  - SPKVDDL-supply, SPKVDDR-supply : Power supplies for the device
> +    (CS47L85, WM1840)
> +
> +  - SPKVDD-supply : Power supply for the device
> +    (CS47L35)
> +
> +Optional properties:
> +
> +  - MICVDD-supply : Power supply, only need to be specified if
> +    powered externally
> +
> +  - reset-gpios : One entry specifying the GPIO controlling /RESET.
> +    As defined in bindings/gpio.txt.
> +    Although optional, it is strongly recommended to use a hardware reset
> +
> +  - MICBIASx : Initial data for the MICBIAS regulators, as covered in
> +    Documentation/devicetree/bindings/regulator/regulator.txt.
> +    One for each MICBIAS generator (MICBIAS1, MICBIAS2, ...)
> +    (all codecs)
> +
> +    One for each output pin (MICBIAS1A, MIBCIAS1B, MICBIAS2A, ...)
> +    (all except CS47L85, WM1840)
> +
> +    The following following additional property is supported for the generator
> +    nodes:
> +      - cirrus,ext-cap : Set to 1 if the MICBIAS has external decoupling
> +        capacitors attached.
> +
> +Example:
> +
> +codec: cs47l85@0 {

Node names should be generic.

You can swap these round if you want, so:

cs47l85: codec@0 {

... is valid.

> +	compatible = "cirrus,cs47l85";
> +	reg = <0>;
> +
> +	reset-gpios = <&gpio 0>;
> +
> +	MICBIAS1 {
> +		regulator-min-microvolt = <900000>;
> +		regulator-max-microvolt = <3300000>;
> +		cirrus,ext-cap = <1>;
> +	};
> +};
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 02995c9..d28e53f 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -3266,7 +3266,10 @@ L:	patches@xxxxxxxxxxxxxxxxxxxxxxxxxxx
>  T:	git https://github.com/CirrusLogic/linux-drivers.git
>  W:	https://github.com/CirrusLogic/linux-drivers/wiki
>  S:	Supported
> +F:	Documentation/devicetree/bindings/mfd/madera.txt
>  F:	include/linux/mfd/madera/*
> +F:	drivers/mfd/madera*
> +F:	drivers/mfd/cs47l*
>  
>  CLEANCACHE API
>  M:	Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
> diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> index ce3a918..f0f9979 100644
> --- a/drivers/mfd/Kconfig
> +++ b/drivers/mfd/Kconfig
> @@ -203,6 +203,29 @@ config MFD_CROS_EC_SPI
>  	  response time cannot be guaranteed, we support ignoring
>  	  'pre-amble' bytes before the response actually starts.
>  
> +config MFD_MADERA
> +	bool
> +	select REGMAP
> +	select MFD_CORE
> +
> +config MFD_MADERA_I2C
> +	tristate "Cirrus Logic Madera codecs with I2C"
> +	select MFD_MADERA
> +	select REGMAP_I2C
> +	depends on I2C
> +	help
> +	  Support for the Cirrus Logic Madera platform audio SoC
> +	  core functionality controlled via I2C.
> +
> +config MFD_MADERA_SPI
> +	tristate "Cirrus Logic Madera codecs with SPI"
> +	select MFD_MADERA
> +	select REGMAP_SPI
> +	depends on SPI_MASTER
> +	help
> +	  Support for the Cirrus Logic Madera platform audio SoC
> +	  core functionality controlled via SPI.
> +
>  config MFD_ASIC3
>  	bool "Compaq ASIC3"
>  	depends on GPIOLIB && ARM
> diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
> index fa86dbe..c41f6c9 100644
> --- a/drivers/mfd/Makefile
> +++ b/drivers/mfd/Makefile
> @@ -72,6 +72,10 @@ obj-$(CONFIG_MFD_WM8350_I2C)	+= wm8350-i2c.o
>  wm8994-objs			:= wm8994-core.o wm8994-irq.o wm8994-regmap.o
>  obj-$(CONFIG_MFD_WM8994)	+= wm8994.o
>  
> +obj-$(CONFIG_MFD_MADERA)	+= madera-core.o
> +obj-$(CONFIG_MFD_MADERA_I2C)	+= madera-i2c.o
> +obj-$(CONFIG_MFD_MADERA_SPI)	+= madera-spi.o
> +
>  obj-$(CONFIG_TPS6105X)		+= tps6105x.o
>  obj-$(CONFIG_TPS65010)		+= tps65010.o
>  obj-$(CONFIG_TPS6507X)		+= tps6507x.o
> diff --git a/drivers/mfd/madera-core.c b/drivers/mfd/madera-core.c
> new file mode 100644
> index 0000000..ab5fe9b
> --- /dev/null
> +++ b/drivers/mfd/madera-core.c
> @@ -0,0 +1,689 @@
> +/*
> + * Core MFD support for Cirrus Logic Madera codecs
> + *
> + * Copyright 2015-2017 Cirrus Logic
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + */
> +
> +#include <linux/device.h>
> +#include <linux/delay.h>
> +#include <linux/err.h>
> +#include <linux/gpio.h>
> +#include <linux/mfd/core.h>
> +#include <linux/module.h>
> +#include <linux/notifier.h>
> +#include <linux/of.h>
> +#include <linux/of_device.h>
> +#include <linux/of_gpio.h>
> +#include <linux/platform_device.h>
> +#include <linux/pm_runtime.h>
> +#include <linux/regmap.h>
> +#include <linux/regulator/consumer.h>
> +#include <linux/regulator/machine.h>
> +#include <linux/regulator/of_regulator.h>
> +
> +#include <linux/mfd/madera/core.h>
> +#include <linux/mfd/madera/registers.h>
> +
> +#include "madera.h"
> +
> +#define CS47L35_SILICON_ID	0x6360
> +#define CS47L85_SILICON_ID	0x6338
> +#define CS47L90_SILICON_ID	0x6364
> +
> +#define MADERA_32KZ_MCLK2	1
> +
> +static const char * const madera_core_supplies[] = {
> +	"AVDD",
> +	"DBVDD1",
> +};
> +
> +static const struct mfd_cell madera_ldo1_devs[] = {
> +	{ .name = "madera-ldo1", .of_compatible = "cirrus,madera-ldo1" },
> +};
> +
> +static const struct mfd_cell cs47l35_devs[] = {
> +	{ .name = "madera-pinctrl", .of_compatible = "cirrus,madera-pinctrl" },
> +	{ .name = "madera-irq", },

I believe this should be "interrupt-controller".

irq is ambiguous.

Same goes for the ones below.

> +	{ .name = "madera-micsupp", .of_compatible = "cirrus,madera-micsupp" },
> +	{ .name = "madera-gpio",    .of_compatible = "cirrus,madera-gpio" },
> +	{ .name = "madera-extcon",  .of_compatible = "cirrus,madera-extcon" },
> +	{ .name = "cs47l35-codec",  .of_compatible = "cirrus,cs47l35-codec" },
> +	{ .name = "madera-haptics", .of_compatible = "cirrus,madera-haptics" },
> +};
> +
> +static const struct mfd_cell cs47l85_devs[] = {
> +	{ .name = "madera-pinctrl", .of_compatible = "cirrus,madera-pinctrl" },
> +	{ .name = "madera-irq", },
> +	{ .name = "madera-micsupp", .of_compatible = "cirrus,madera-micsupp" },
> +	{ .name = "madera-gpio",    .of_compatible = "cirrus,madera-gpio" },
> +	{ .name = "madera-extcon",  .of_compatible = "cirrus,madera-extcon" },
> +	{ .name = "cs47l85-codec",  .of_compatible = "cirrus,cs47l85-codec" },
> +	{ .name = "madera-haptics", .of_compatible = "cirrus,madera-haptics" },
> +};
> +
> +static const struct mfd_cell cs47l90_devs[] = {
> +	{ .name = "madera-pinctrl", .of_compatible = "cirrus,madera-pinctrl" },
> +	{ .name = "madera-irq", },
> +	{ .name = "madera-micsupp", .of_compatible = "cirrus,madera-micsupp" },
> +	{ .name = "madera-gpio",    .of_compatible = "cirrus,madera-gpio" },
> +	{ .name = "madera-extcon",  .of_compatible = "cirrus,madera-extcon" },
> +	{ .name = "cs47l90-codec",  .of_compatible = "cirrus,cs47l90-codec" },
> +	{ .name = "madera-haptics", .of_compatible = "cirrus,madera-haptics" },
> +};
> +
> +const char *madera_name_from_type(enum madera_type type)
> +{
> +	switch (type) {
> +	case CS47L35:
> +		return "CS47L35";
> +	case CS47L85:
> +		return "CS47L85";
> +	case CS47L90:
> +		return "CS47L90";
> +	case CS47L91:
> +		return "CS47L91";
> +	case WM1840:
> +		return "WM1840";
> +	default:
> +		return "Unknown";
> +	}
> +}
> +EXPORT_SYMBOL_GPL(madera_name_from_type);
> +
> +#define MADERA_BOOT_POLL_MAX_INTERVAL_US  5000
> +#define MADERA_BOOT_POLL_TIMEOUT_US	 25000
> +
> +static int madera_wait_for_boot(struct madera *madera)
> +{
> +	unsigned int val;
> +	int ret;
> +
> +	/*
> +	 * We can't use an interrupt as we need to runtime resume to do so,
> +	 * so we poll the status bit. This won't race with the interrupt
> +	 * handler because it will be blocked on runtime resume.
> +	 */
> +	ret = regmap_read_poll_timeout(madera->regmap,
> +				       MADERA_IRQ1_RAW_STATUS_1,
> +				       val,
> +				       (val & MADERA_BOOT_DONE_STS1),
> +				       MADERA_BOOT_POLL_MAX_INTERVAL_US,
> +				       MADERA_BOOT_POLL_TIMEOUT_US);
> +	/*
> +	 * BOOT_DONE defaults to unmasked on boot so we must ack it.
> +	 * Do this unconditionally to avoid interrupt storms
> +	 */
> +	regmap_write(madera->regmap, MADERA_IRQ1_STATUS_1,
> +		     MADERA_BOOT_DONE_EINT1);
> +
> +	if (ret)
> +		dev_err(madera->dev, "Polling BOOT_DONE_STS failed: %d\n", ret);

Why isn't this under the call to regmap_read_poll_timeout()?

> +	pm_runtime_mark_last_busy(madera->dev);
> +
> +	return ret;
> +}
> +
> +static int madera_soft_reset(struct madera *madera)
> +{
> +	int ret;
> +
> +	ret = regmap_write(madera->regmap, MADERA_SOFTWARE_RESET, 0);
> +	if (ret != 0) {
> +		dev_err(madera->dev, "Failed to soft reset device: %d\n", ret);
> +		return ret;
> +	}
> +	usleep_range(1000, 2000);

Why have you chosen 1000 => 2000?

If you obtained specific information from the datasheet, please quote
it in the comment here.

> +	return 0;
> +}
> +
> +static void madera_enable_hard_reset(struct madera *madera)
> +{
> +	if (madera->reset_gpio)
> +		gpiod_set_value_cansleep(madera->reset_gpio, 0);
> +}
> +
> +static void madera_disable_hard_reset(struct madera *madera)
> +{
> +	if (madera->reset_gpio) {
> +		gpiod_set_value_cansleep(madera->reset_gpio, 1);
> +		usleep_range(1000, 2000);
> +	}
> +}
> +
> +#ifdef CONFIG_PM
> +static int madera_runtime_resume(struct device *dev)
> +{
> +	struct madera *madera = dev_get_drvdata(dev);
> +	int ret;
> +
> +	dev_dbg(madera->dev, "Leaving sleep mode\n");

Nit: Less code to just use 'dev', no?

> +	ret = regulator_enable(madera->dcvdd);
> +	if (ret) {
> +		dev_err(madera->dev, "Failed to enable DCVDD: %d\n", ret);
> +		return ret;
> +	}
> +
> +	regcache_cache_only(madera->regmap, false);
> +	regcache_cache_only(madera->regmap_32bit, false);
> +
> +	ret = madera_wait_for_boot(madera);
> +	if (ret)
> +		goto err;
> +
> +	ret = regcache_sync(madera->regmap);
> +	if (ret) {
> +		dev_err(madera->dev,
> +			"Failed to restore 16-bit register cache\n");
> +		goto err;
> +	}
> +
> +	ret = regcache_sync(madera->regmap_32bit);
> +	if (ret) {
> +		dev_err(madera->dev,
> +			"Failed to restore 32-bit register cache\n");
> +		goto err;
> +	}
> +
> +	return 0;
> +
> +err:
> +	regcache_cache_only(madera->regmap_32bit, true);
> +	regcache_cache_only(madera->regmap, true);
> +	regulator_disable(madera->dcvdd);
> +
> +	return ret;
> +}
> +
> +static int madera_runtime_suspend(struct device *dev)
> +{
> +	struct madera *madera = dev_get_drvdata(dev);
> +
> +	dev_dbg(madera->dev, "Entering sleep mode\n");
> +
> +	regcache_cache_only(madera->regmap, true);
> +	regcache_mark_dirty(madera->regmap);
> +	regcache_cache_only(madera->regmap_32bit, true);
> +	regcache_mark_dirty(madera->regmap_32bit);
> +
> +	regulator_disable(madera->dcvdd);
> +
> +	return 0;
> +}
> +#endif
> +
> +const struct dev_pm_ops madera_pm_ops = {
> +	SET_RUNTIME_PM_OPS(madera_runtime_suspend,
> +			   madera_runtime_resume,
> +			   NULL)
> +};
> +EXPORT_SYMBOL_GPL(madera_pm_ops);
> +
> +unsigned int madera_get_num_micbias(struct madera *madera)
> +{
> +
> +	switch (madera->type) {
> +	case CS47L35:
> +		return 2;
> +	case CS47L85:
> +	case WM1840:
> +		return 4;
> +	case CS47L90:
> +	case CS47L91:
> +		return 2;
> +	default:
> +		dev_warn(madera->dev, "No micbias known for codec %s\n",
> +			 madera_name_from_type(madera->type));
> +		return 0;
> +	}
> +}
> +EXPORT_SYMBOL_GPL(madera_get_num_micbias);

Looks very subsystem specific.  Where is this called from?

> +unsigned int madera_get_num_childbias(struct madera *madera,
> +				      unsigned int micbias)
> +{
> +	/*
> +	 * micbias argument reserved for future codecs that don't
> +	 * have the same number of children on each micbias
> +	 */
> +
> +	switch (madera->type) {
> +	case CS47L35:
> +		return 2;
> +	case CS47L85:
> +	case WM1840:
> +		return 0;
> +	case CS47L90:
> +	case CS47L91:
> +		return 4;
> +	default:
> +		dev_warn(madera->dev, "No child micbias known for codec %s\n",
> +			 madera_name_from_type(madera->type));
> +		return 0;
> +	}
> +}
> +EXPORT_SYMBOL_GPL(madera_get_num_childbias);

As above.

> +#ifdef CONFIG_OF
> +const struct of_device_id madera_of_match[] = {
> +	{ .compatible = "cirrus,cs47l35", .data = (void *)CS47L35 },
> +	{ .compatible = "cirrus,cs47l85", .data = (void *)CS47L85 },
> +	{ .compatible = "cirrus,cs47l90", .data = (void *)CS47L90 },
> +	{ .compatible = "cirrus,cs47l91", .data = (void *)CS47L91 },
> +	{ .compatible = "cirrus,wm1840", .data = (void *)WM1840 },
> +	{},
> +};
> +EXPORT_SYMBOL_GPL(madera_of_match);
> +
> +unsigned long madera_of_get_type(struct device *dev)
> +{
> +	const struct of_device_id *id = of_match_device(madera_of_match, dev);
> +
> +	if (id)
> +		return (unsigned long)id->data;
> +	else
> +		return 0;
> +}
> +EXPORT_SYMBOL_GPL(madera_of_get_type);
> +#endif
> +
> +static int madera_prop_get_core_pdata(struct madera *madera)

Will this ever do more than obtain a GPIO?

If not, please consider renaming the function.

> +{
> +	int ret;
> +
> +	madera->reset_gpio = devm_gpiod_get_optional(madera->dev,
> +						     "reset",
> +						     GPIOD_OUT_LOW);
> +	if (IS_ERR(madera->reset_gpio)) {
> +		ret = PTR_ERR(madera->reset_gpio);
> +
> +		if (ret == -EPROBE_DEFER)
> +			return ret;
> +		else if ((ret < 0) && (ret != -EINVAL))
> +			dev_warn(madera->dev,
> +				 "DT property reset-gpio is malformed: %d\n",
> +				 ret);
> +	}

This hunk looks like it could be simplified.

> +	return 0;
> +}
> +
> +static void madera_configure_micbias(struct madera *madera)
> +{
> +	unsigned int num_micbias = madera_get_num_micbias(madera);
> +	struct madera_micbias_pdata *pdata;
> +	struct regulator_init_data *init_data;
> +	unsigned int num_child_micbias;
> +	unsigned int val, mask, reg;
> +	int i, j, ret;
> +
> +	for (i = 0; i < num_micbias; i++) {
> +		pdata = &madera->pdata.micbias[i];
> +		init_data = &pdata->init_data;
> +
> +		if (!init_data->constraints.max_uV &&
> +		    !init_data->constraints.valid_ops_mask)
> +			continue;	/* pdata not set */
> +
> +		/* Apply default for bypass mode */
> +		if (!init_data->constraints.max_uV)
> +			init_data->constraints.max_uV = 2800;
> +
> +		val = (init_data->constraints.max_uV - 1500000) / 100000;
> +		val <<= MADERA_MICB1_LVL_SHIFT;
> +
> +		mask = MADERA_MICB1_LVL_MASK | MADERA_MICB1_EXT_CAP |
> +			MADERA_MICB1_BYPASS | MADERA_MICB1_RATE;
> +
> +		if (pdata->ext_cap)
> +			val |= MADERA_MICB1_EXT_CAP;
> +
> +		/* if no child biases the discharge is set in the parent */
> +		num_child_micbias = madera_get_num_childbias(madera, i + 1);
> +		if (num_child_micbias == 0) {
> +			mask |= MADERA_MICB1_DISCH;
> +
> +			switch (init_data->constraints.active_discharge) {
> +			case REGULATOR_ACTIVE_DISCHARGE_ENABLE:
> +				val |= MADERA_MICB1_DISCH;
> +				break;
> +			default:
> +				break;
> +			}
> +		}
> +
> +		if (init_data->constraints.soft_start)
> +			val |= MADERA_MICB1_RATE;
> +
> +		if (init_data->constraints.valid_ops_mask &
> +		    REGULATOR_CHANGE_BYPASS)
> +			val |= MADERA_MICB1_BYPASS;
> +
> +		reg = MADERA_MIC_BIAS_CTRL_1 + i;
> +		ret = regmap_update_bits(madera->regmap, reg, mask, val);
> +		if (ret)
> +			dev_warn(madera->dev, "Failed to write 0x%x (%d)\n",
> +				 reg, ret);
> +
> +		dev_dbg(madera->dev, "Set MICBIAS_CTRL_%d mask=0x%x val=0x%x\n",
> +			i + 1, mask, val);
> +
> +		/* Configure the child micbias pins */
> +		val = 0;
> +		mask = 0;
> +		for (j = 0; j < num_child_micbias; j++) {
> +			mask |= (MADERA_MICB1A_DISCH << (j * 4));
> +
> +			init_data = &pdata->pin[j].init_data;
> +			switch (init_data->constraints.active_discharge) {
> +			case REGULATOR_ACTIVE_DISCHARGE_ENABLE:
> +				val |= (MADERA_MICB1A_DISCH << (j * 4));
> +				break;
> +			default:
> +				break;
> +			}
> +		}
> +
> +		if (mask) {
> +			reg = MADERA_MIC_BIAS_CTRL_5 + (i * 2);
> +			ret = regmap_update_bits(madera->regmap, reg, mask, val);
> +			if (ret)
> +				dev_warn(madera->dev,
> +					 "Failed to write 0x%x (%d)\n",
> +					 reg, ret);
> +
> +			dev_dbg(madera->dev,
> +				"Set MICBIAS_CTRL_%d mask=0x%x val=0x%x\n",
> +				i + 5, mask, val);
> +		}
> +	}
> +}

This 'stuff' looks like it should be moved out to the sub-device
drivers.

> +int madera_dev_init(struct madera *madera)
> +{
> +	struct device *dev = madera->dev;
> +	const char *name;
> +	unsigned int hwid;
> +	int (*patch_fn)(struct madera *) = NULL;
> +	const struct mfd_cell *mfd_devs;
> +	int n_devs = 0;
> +	int i, ret;
> +
> +	dev_set_drvdata(madera->dev, madera);
> +	BLOCKING_INIT_NOTIFIER_HEAD(&madera->notifier);
> +
> +	if (dev_get_platdata(madera->dev)) {
> +		memcpy(&madera->pdata, dev_get_platdata(madera->dev),
> +		       sizeof(madera->pdata));
> +
> +		/* We use 0 in pdata to indicate a GPIO has not been set */
> +		if (madera->pdata.reset > 0) {
> +			/* Start out with /RESET asserted */
> +			ret = devm_gpio_request_one(madera->dev,
> +						madera->pdata.reset,
> +						GPIOF_DIR_OUT | GPIOF_INIT_LOW,
> +						"madera reset");
> +			if (ret) {
> +				dev_err(dev, "Failed to request /RESET: %d\n",
> +					ret);
> +				return ret;
> +			}
> +
> +			madera->reset_gpio = gpio_to_desc(madera->pdata.reset);
> +		}
> +	} else {
> +		ret = madera_prop_get_core_pdata(madera);
> +		if (ret)
> +			return ret;
> +	}
> +
> +	if (!madera->reset_gpio)
> +		dev_warn(madera->dev,
> +			 "Running without reset GPIO is not recommended\n");

I suggest moving all of the above into madera_prop_get_core_pdata()
and renaming it to  madera_get_gpio().

It also looks like it could be simplified to reduce indentation.

> +	regcache_cache_only(madera->regmap, true);
> +	regcache_cache_only(madera->regmap_32bit, true);
> +
> +	for (i = 0; i < ARRAY_SIZE(madera_core_supplies); i++)
> +		madera->core_supplies[i].supply = madera_core_supplies[i];
> +
> +	madera->num_core_supplies = ARRAY_SIZE(madera_core_supplies);
> +
> +	switch (madera->type) {
> +	case CS47L35:
> +	case CS47L90:
> +	case CS47L91:

Perhaps a comment here to say why these devices do not require LDO1
devices.

> +		break;
> +	case CS47L85:
> +	case WM1840:
> +		ret = mfd_add_devices(madera->dev, PLATFORM_DEVID_NONE,
> +				      madera_ldo1_devs,
> +				      ARRAY_SIZE(madera_ldo1_devs),
> +				      NULL, 0, NULL);
> +		if (ret != 0) {

Please use these checks in order of preference:

if (ret)
if (ret < 0)
if (ret != 0)

... depending on the situation.

Here the former will do.

> +			dev_err(dev, "Failed to add LDO1 child: %d\n", ret);
> +			return ret;
> +		}
> +		break;
> +	default:
> +		dev_err(madera->dev, "Unknown device type %d\n", madera->type);
> +		return -ENODEV;
> +	}
> +
> +	ret = devm_regulator_bulk_get(dev, madera->num_core_supplies,
> +				      madera->core_supplies);
> +	if (ret) {
> +		dev_err(dev, "Failed to request core supplies: %d\n", ret);
> +		goto err_devs;
> +	}
> +
> +	/*
> +	 * Don't use devres here because the only device we have to get
> +	 * against is the MFD device and DCVDD will likely be supplied by
> +	 * one of its children. Meaning that the regulator will be
> +	 * destroyed by the time devres calls regulator put.
> +	 */
> +	madera->dcvdd = regulator_get_exclusive(madera->dev, "DCVDD");
> +	if (IS_ERR(madera->dcvdd)) {
> +		ret = PTR_ERR(madera->dcvdd);
> +		dev_err(dev, "Failed to request DCVDD: %d\n", ret);
> +		goto err_devs;
> +	}
> +
> +	ret = regulator_bulk_enable(madera->num_core_supplies,
> +				    madera->core_supplies);
> +	if (ret) {
> +		dev_err(dev, "Failed to enable core supplies: %d\n", ret);
> +		goto err_dcvdd;
> +	}
> +
> +	ret = regulator_enable(madera->dcvdd);
> +	if (ret) {
> +		dev_err(dev, "Failed to enable DCVDD: %d\n", ret);
> +		goto err_enable;
> +	}
> +
> +	madera_disable_hard_reset(madera);
> +
> +	regcache_cache_only(madera->regmap, false);
> +	regcache_cache_only(madera->regmap_32bit, false);
> +
> +	/*
> +	 * Verify that this is a chip we know about before we
> +	 * starting doing any writes to its registers
> +	 */
> +	ret = regmap_read(madera->regmap, MADERA_SOFTWARE_RESET, &hwid);
> +	if (ret) {
> +		dev_err(dev, "Failed to read ID register: %d\n", ret);
> +		goto err_reset;
> +	}
> +
> +	switch (hwid) {
> +	case CS47L35_SILICON_ID:
> +	case CS47L85_SILICON_ID:
> +	case CS47L90_SILICON_ID:
> +		break;
> +	default:
> +		dev_err(madera->dev, "Unknown device ID: %x\n", hwid);
> +		ret = -EINVAL;
> +		goto err_reset;
> +	}
> +
> +	/* If we don't have a reset GPIO use a soft reset */
> +	if (!madera->reset_gpio) {
> +		ret = madera_soft_reset(madera);
> +		if (ret)
> +			goto err_reset;
> +	}
> +
> +	ret = madera_wait_for_boot(madera);
> +	if (ret) {
> +		dev_err(madera->dev, "Device failed initial boot: %d\n", ret);
> +		goto err_reset;
> +	}
> +
> +	ret = regmap_read(madera->regmap, MADERA_HARDWARE_REVISION,
> +			  &madera->rev);
> +	if (ret) {
> +		dev_err(dev, "Failed to read revision register: %d\n", ret);
> +		goto err_reset;
> +	}
> +	madera->rev &= MADERA_HW_REVISION_MASK;
> +
> +	name = madera_name_from_type(madera->type);
> +
> +	switch (hwid) {
> +	case CS47L35_SILICON_ID:
> +		if (IS_ENABLED(CONFIG_MFD_CS47L35)) {
> +			switch (madera->type) {
> +			case CS47L35:
> +				patch_fn = cs47l35_patch;
> +				mfd_devs = cs47l35_devs;
> +				n_devs = ARRAY_SIZE(cs47l35_devs);
> +				break;
> +			default:
> +				break;
> +			}
> +		}
> +		break;
> +	case CS47L85_SILICON_ID:
> +		if (IS_ENABLED(CONFIG_MFD_CS47L85)) {
> +			switch (madera->type) {
> +			case CS47L85:
> +			case WM1840:
> +				patch_fn = cs47l85_patch;
> +				mfd_devs = cs47l85_devs;
> +				n_devs = ARRAY_SIZE(cs47l85_devs);
> +				break;
> +			default:
> +				break;
> +			}
> +		}
> +		break;
> +	case CS47L90_SILICON_ID:
> +		if (IS_ENABLED(CONFIG_MFD_CS47L90)) {
> +			switch (madera->type) {
> +			case CS47L90:
> +			case CS47L91:
> +				patch_fn = cs47l90_patch;
> +				mfd_devs = cs47l90_devs;
> +				n_devs = ARRAY_SIZE(cs47l90_devs);
> +				break;
> +			default:
> +				break;
> +			}
> +		}
> +		break;
> +	default:
> +		break;
> +	}
> +
> +	if (!n_devs) {
> +		dev_err(madera->dev, "Device ID 0x%x not a %s\n", hwid, name);
> +		ret = -ENODEV;
> +		goto err_reset;
> +	}
> +
> +	dev_info(dev, "%s silicon revision %d\n", name, madera->rev);
> +
> +	/* Apply hardware patch */
> +	if (patch_fn) {
> +		ret = patch_fn(madera);
> +		if (ret) {
> +			dev_err(madera->dev, "Failed to apply patch %d\n", ret);
> +			goto err_reset;
> +		}
> +	}
> +
> +	/* Init 32k clock sourced from MCLK2 */
> +	ret = regmap_update_bits(madera->regmap,
> +			MADERA_CLOCK_32K_1,
> +			MADERA_CLK_32K_ENA_MASK | MADERA_CLK_32K_SRC_MASK,
> +			MADERA_CLK_32K_ENA | MADERA_32KZ_MCLK2);
> +	if (ret) {
> +		dev_err(madera->dev, "Failed to init 32k clock: %d\n", ret);
> +		goto err_reset;
> +	}
> +
> +	madera_configure_micbias(madera);
> +
> +	pm_runtime_set_active(madera->dev);
> +	pm_runtime_enable(madera->dev);
> +	pm_runtime_set_autosuspend_delay(madera->dev, 100);
> +	pm_runtime_use_autosuspend(madera->dev);
> +
> +	ret = mfd_add_devices(madera->dev, PLATFORM_DEVID_NONE,
> +			      mfd_devs, n_devs,
> +			      NULL, 0, NULL);
> +	if (ret) {
> +		dev_err(madera->dev, "Failed to add subdevices: %d\n", ret);
> +		goto err_pm_runtime;
> +	}
> +
> +	return 0;
> +
> +err_pm_runtime:
> +	pm_runtime_disable(madera->dev);
> +err_reset:
> +	madera_enable_hard_reset(madera);
> +	regulator_disable(madera->dcvdd);
> +err_enable:
> +	regulator_bulk_disable(madera->num_core_supplies,
> +			       madera->core_supplies);
> +err_dcvdd:
> +	regulator_put(madera->dcvdd);
> +err_devs:
> +	mfd_remove_devices(dev);
> +
> +	return ret;
> +}
> +EXPORT_SYMBOL_GPL(madera_dev_init);
> +
> +int madera_dev_exit(struct madera *madera)
> +{
> +	/* Prevent any IRQs being serviced while we clean up */
> +	disable_irq(madera->irq);
> +
> +	/*
> +	 * DCVDD could be supplied by a child node, we must disable it before
> +	 * removing the children, and prevent PM runtime from turning it back on
> +	 */
> +	pm_runtime_disable(madera->dev);
> +
> +	regulator_disable(madera->dcvdd);
> +	regulator_put(madera->dcvdd);
> +
> +	mfd_remove_devices(madera->dev);
> +	madera_enable_hard_reset(madera);
> +
> +	regulator_bulk_disable(madera->num_core_supplies,
> +			       madera->core_supplies);
> +	return 0;
> +}
> +EXPORT_SYMBOL_GPL(madera_dev_exit);
> diff --git a/drivers/mfd/madera-i2c.c b/drivers/mfd/madera-i2c.c
> new file mode 100644
> index 0000000..8c90780
> --- /dev/null
> +++ b/drivers/mfd/madera-i2c.c
> @@ -0,0 +1,130 @@
> +/*
> + * I2C bus interface to Cirrus Logic Madera codecs
> + *
> + * Copyright 2015-2017 Cirrus Logic
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + */
> +
> +#include <linux/device.h>
> +#include <linux/err.h>
> +#include <linux/i2c.h>
> +#include <linux/module.h>
> +#include <linux/regmap.h>
> +#include <linux/of.h>
> +
> +#include <linux/mfd/madera/core.h>
> +
> +#include "madera.h"
> +
> +static int madera_i2c_probe(struct i2c_client *i2c,
> +			    const struct i2c_device_id *id)
> +{
> +	struct madera *madera;
> +	const struct regmap_config *regmap_16bit_config = NULL;
> +	const struct regmap_config *regmap_32bit_config = NULL;
> +	unsigned long type;
> +	int ret;
> +
> +	if (i2c->dev.of_node)
> +		type = madera_of_get_type(&i2c->dev);

Just call this madera_get_type() and do the OF || !OF checking in
there.

> +	else
> +		type = id->driver_data;
> +
> +	switch (type) {
> +	case CS47L35:
> +		if (IS_ENABLED(CONFIG_MFD_CS47L35)) {
> +			regmap_16bit_config = &cs47l35_16bit_i2c_regmap;
> +			regmap_32bit_config = &cs47l35_32bit_i2c_regmap;
> +		}
> +		break;
> +	case CS47L85:
> +	case WM1840:
> +		if (IS_ENABLED(CONFIG_MFD_CS47L85)) {
> +			regmap_16bit_config = &cs47l85_16bit_i2c_regmap;
> +			regmap_32bit_config = &cs47l85_32bit_i2c_regmap;
> +		}
> +		break;
> +	case CS47L90:
> +	case CS47L91:
> +		if (IS_ENABLED(CONFIG_MFD_CS47L90)) {
> +			regmap_16bit_config = &cs47l90_16bit_i2c_regmap;
> +			regmap_32bit_config = &cs47l90_32bit_i2c_regmap;
> +		}
> +		break;
> +	default:
> +		dev_err(&i2c->dev,
> +			"Unknown Madera I2C device type %ld\n", type);
> +		return -EINVAL;
> +	}
> +
> +	if (!regmap_16bit_config) {
> +		dev_err(&i2c->dev,
> +			"Kernel does not include support for %s\n",
> +			madera_name_from_type(type));
> +		return -EINVAL;
> +	}
> +
> +	madera = devm_kzalloc(&i2c->dev, sizeof(*madera), GFP_KERNEL);
> +	if (!madera)
> +		return -ENOMEM;
> +
> +	madera->regmap = devm_regmap_init_i2c(i2c, regmap_16bit_config);
> +	if (IS_ERR(madera->regmap)) {
> +		ret = PTR_ERR(madera->regmap);
> +		dev_err(&i2c->dev,
> +			"Failed to allocate 16-bit register map: %d\n",	ret);
> +		return ret;
> +	}
> +
> +	madera->regmap_32bit = devm_regmap_init_i2c(i2c, regmap_32bit_config);
> +	if (IS_ERR(madera->regmap_32bit)) {
> +		ret = PTR_ERR(madera->regmap_32bit);
> +		dev_err(&i2c->dev,
> +			"Failed to allocate 32-bit register map: %d\n", ret);
> +		return ret;
> +	}
> +
> +	madera->type = type;
> +	madera->dev = &i2c->dev;
> +	madera->irq = i2c->irq;
> +
> +	return madera_dev_init(madera);
> +}
> +
> +static int madera_i2c_remove(struct i2c_client *i2c)
> +{
> +	struct madera *madera = dev_get_drvdata(&i2c->dev);
> +
> +	madera_dev_exit(madera);

Nit: \n here please.

> +	return 0;
> +}
> +
> +static const struct i2c_device_id madera_i2c_id[] = {
> +	{ "cs47l35", CS47L35 },
> +	{ "cs47l85", CS47L85 },
> +	{ "cs47l90", CS47L90 },
> +	{ "cs47l91", CS47L91 },
> +	{ "wm1840", WM1840 },
> +	{ }
> +};
> +MODULE_DEVICE_TABLE(i2c, madera_i2c_id);
> +
> +static struct i2c_driver madera_i2c_driver = {
> +	.driver = {
> +		.name	= "madera",
> +		.pm	= &madera_pm_ops,
> +		.of_match_table	= of_match_ptr(madera_of_match),
> +	},
> +	.probe		= madera_i2c_probe,
> +	.remove		= madera_i2c_remove,
> +	.id_table	= madera_i2c_id,
> +};
> +
> +module_i2c_driver(madera_i2c_driver);
> +
> +MODULE_DESCRIPTION("Madera I2C bus interface");
> +MODULE_AUTHOR("Richard Fitzgerald <rf@xxxxxxxxxxxxxxxxxxxxxxxxxxx>");
> +MODULE_LICENSE("GPL v2");
> diff --git a/drivers/mfd/madera-spi.c b/drivers/mfd/madera-spi.c
> new file mode 100644
> index 0000000..e7e13f0
> --- /dev/null
> +++ b/drivers/mfd/madera-spi.c
> @@ -0,0 +1,131 @@
> +/*
> + * SPI bus interface to Cirrus Logic Madera codecs
> + *
> + * Copyright 2015-2017 Cirrus Logic
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + */
> +
> +#include <linux/device.h>
> +#include <linux/err.h>
> +#include <linux/module.h>
> +#include <linux/regmap.h>
> +#include <linux/of.h>
> +#include <linux/spi/spi.h>
> +
> +#include <linux/mfd/madera/core.h>
> +
> +#include "madera.h"
> +
> +static int madera_spi_probe(struct spi_device *spi)
> +{
> +	const struct spi_device_id *id = spi_get_device_id(spi);
> +	struct madera *madera;
> +	const struct regmap_config *regmap_16bit_config = NULL;
> +	const struct regmap_config *regmap_32bit_config = NULL;
> +	unsigned long type;
> +	int ret;
> +
> +	if (spi->dev.of_node)
> +		type = madera_of_get_type(&spi->dev);
> +	else
> +		type = id->driver_data;

As above.

> +	switch (type) {
> +	case CS47L35:
> +		if (IS_ENABLED(CONFIG_MFD_CS47L35)) {
> +			regmap_16bit_config = &cs47l35_16bit_spi_regmap;
> +			regmap_32bit_config = &cs47l35_32bit_spi_regmap;
> +		}
> +		break;
> +	case CS47L85:
> +	case WM1840:
> +		if (IS_ENABLED(CONFIG_MFD_CS47L85)) {
> +			regmap_16bit_config = &cs47l85_16bit_spi_regmap;
> +			regmap_32bit_config = &cs47l85_32bit_spi_regmap;
> +		}
> +		break;
> +	case CS47L90:
> +	case CS47L91:
> +		if (IS_ENABLED(CONFIG_MFD_CS47L90)) {
> +			regmap_16bit_config = &cs47l90_16bit_spi_regmap;
> +			regmap_32bit_config = &cs47l90_32bit_spi_regmap;
> +		}
> +		break;
> +	default:
> +		dev_err(&spi->dev,
> +			"Unknown Madera SPI device type %ld\n", type);
> +		return -EINVAL;
> +	}
> +
> +	if (!regmap_16bit_config) {
> +		dev_err(&spi->dev,
> +			"Kernel does not include support for %s\n",
> +			madera_name_from_type(type));
> +		return -EINVAL;
> +	}
> +
> +	madera = devm_kzalloc(&spi->dev, sizeof(*madera), GFP_KERNEL);
> +	if (!madera)
> +		return -ENOMEM;
> +
> +	madera->regmap = devm_regmap_init_spi(spi, regmap_16bit_config);
> +	if (IS_ERR(madera->regmap)) {
> +		ret = PTR_ERR(madera->regmap);
> +		dev_err(&spi->dev,
> +			"Failed to allocate 16-bit register map: %d\n",	ret);
> +		return ret;
> +	}
> +
> +	madera->regmap_32bit = devm_regmap_init_spi(spi, regmap_32bit_config);
> +	if (IS_ERR(madera->regmap_32bit)) {
> +		ret = PTR_ERR(madera->regmap_32bit);
> +		dev_err(&spi->dev,
> +			"Failed to allocate 32-bit register map: %d\n",	ret);
> +		return ret;
> +	}
> +
> +	madera->type = type;
> +	madera->dev = &spi->dev;
> +	madera->irq = spi->irq;
> +
> +	return madera_dev_init(madera);
> +}
> +
> +static int madera_spi_remove(struct spi_device *spi)
> +{
> +	struct madera *madera = spi_get_drvdata(spi);
> +
> +	madera_dev_exit(madera);

As above.

> +	return 0;
> +}
> +
> +static const struct spi_device_id madera_spi_ids[] = {
> +	{ "cs47l35", CS47L35 },
> +	{ "cs47l85", CS47L85 },
> +	{ "cs47l90", CS47L90 },
> +	{ "cs47l91", CS47L91 },
> +	{ "wm1840", WM1840 },
> +	{ },
> +};
> +MODULE_DEVICE_TABLE(spi, madera_spi_ids);
> +
> +static struct spi_driver madera_spi_driver = {
> +	.driver = {
> +		.name	= "madera",
> +		.owner	= THIS_MODULE,
> +		.pm	= &madera_pm_ops,
> +		.of_match_table	= of_match_ptr(madera_of_match),
> +	},
> +	.probe		= madera_spi_probe,
> +	.remove		= madera_spi_remove,
> +	.id_table	= madera_spi_ids,
> +};
> +
> +module_spi_driver(madera_spi_driver);
> +
> +MODULE_DESCRIPTION("Madera SPI bus interface");
> +MODULE_AUTHOR("Richard Fitzgerald <rf@xxxxxxxxxxxxxxxxxxxxxxxxxxx>");
> +MODULE_LICENSE("GPL v2");
> diff --git a/drivers/mfd/madera.h b/drivers/mfd/madera.h
> new file mode 100644
> index 0000000..57f6add
> --- /dev/null
> +++ b/drivers/mfd/madera.h
> @@ -0,0 +1,52 @@
> +/*
> + * madera.h  --  MFD internals for Cirrus Logic Madera codecs

Please remove the file name from this header.

> + * Copyright 2015-2016 Cirrus Logic

This needs updating.

> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + */
> +
> +#ifndef MADERA_MFD_H
> +#define MADERA_MFD_H
> +
> +#include <linux/pm.h>
> +#include <linux/of.h>

Alphabetical.

> +struct madera;
> +
> +extern const struct dev_pm_ops madera_pm_ops;
> +extern const struct of_device_id madera_of_match[];
> +
> +int madera_dev_init(struct madera *madera);
> +int madera_dev_exit(struct madera *madera);
> +
> +#ifdef CONFIG_OF
> +unsigned long madera_of_get_type(struct device *dev);
> +#else
> +static inline unsigned long madera_of_get_type(struct device *dev)
> +{
> +	return 0;
> +}
> +#endif

If you move to a generic get_type approach you can remove these
lines.

> +extern const struct regmap_config cs47l35_16bit_spi_regmap;
> +extern const struct regmap_config cs47l35_32bit_spi_regmap;
> +extern const struct regmap_config cs47l35_16bit_i2c_regmap;
> +extern const struct regmap_config cs47l35_32bit_i2c_regmap;
> +int cs47l35_patch(struct madera *madera);
> +
> +extern const struct regmap_config cs47l85_16bit_spi_regmap;
> +extern const struct regmap_config cs47l85_32bit_spi_regmap;
> +extern const struct regmap_config cs47l85_16bit_i2c_regmap;
> +extern const struct regmap_config cs47l85_32bit_i2c_regmap;
> +int cs47l85_patch(struct madera *madera);
> +
> +extern const struct regmap_config cs47l90_16bit_spi_regmap;
> +extern const struct regmap_config cs47l90_32bit_spi_regmap;
> +extern const struct regmap_config cs47l90_16bit_i2c_regmap;
> +extern const struct regmap_config cs47l90_32bit_i2c_regmap;
> +int cs47l90_patch(struct madera *madera);

Where do these live?

> +#endif
> diff --git a/include/linux/mfd/madera/core.h b/include/linux/mfd/madera/core.h
> new file mode 100644
> index 0000000..59b05f8
> --- /dev/null
> +++ b/include/linux/mfd/madera/core.h
> @@ -0,0 +1,175 @@
> +/*
> + * MFD internals for Cirrus Logic Madera codecs
> + *
> + * Copyright 2015-2017 Cirrus Logic
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + */
> +
> +#ifndef MADERA_CORE_H
> +#define MADERA_CORE_H
> +
> +#include <linux/interrupt.h>
> +#include <linux/regmap.h>
> +#include <linux/notifier.h>
> +#include <linux/gpio/consumer.h>
> +#include <linux/regulator/consumer.h>
> +#include <linux/mfd/madera/pdata.h>
> +#include <linux/irqchip/irq-madera.h>
> +#include <sound/madera-pdata.h>

Alphabetical.

> +enum madera_type {
> +	CS47L35 = 1,
> +	CS47L85 = 2,
> +	CS47L90 = 3,
> +	CS47L91 = 4,
> +	WM1840 = 7,
> +};
> +
> +#define MADERA_MAX_CORE_SUPPLIES	2
> +#define MADERA_MAX_GPIOS		40
> +
> +#define CS47L35_NUM_GPIOS		16
> +#define CS47L85_NUM_GPIOS		40
> +#define CS47L90_NUM_GPIOS		38
> +
> +
> +/* Notifier events */
> +#define MADERA_NOTIFY_VOICE_TRIGGER	0x1
> +#define MADERA_NOTIFY_HPDET		0x2
> +#define MADERA_NOTIFY_MICDET		0x4
> +
> +/* GPIO Function Definitions */
> +#define MADERA_GP_FN_ALTERNATE		0x00
> +#define MADERA_GP_FN_GPIO		0x01
> +#define MADERA_GP_FN_DSP_GPIO		0x02
> +#define MADERA_GP_FN_IRQ1		0x03
> +#define MADERA_GP_FN_IRQ2		0x04
> +#define MADERA_GP_FN_FLL1_CLOCK		0x10
> +#define MADERA_GP_FN_FLL2_CLOCK		0x11
> +#define MADERA_GP_FN_FLL3_CLOCK		0x12
> +#define MADERA_GP_FN_FLLAO_CLOCK	0x13
> +#define MADERA_GP_FN_FLL1_LOCK		0x18
> +#define MADERA_GP_FN_FLL2_LOCK		0x19
> +#define MADERA_GP_FN_FLL3_LOCK		0x1A
> +#define MADERA_GP_FN_FLLAO_LOCK		0x1B
> +#define MADERA_GP_FN_OPCLK_OUT		0x40
> +#define MADERA_GP_FN_OPCLK_ASYNC_OUT	0x41
> +#define MADERA_GP_FN_PWM1		0x48
> +#define MADERA_GP_FN_PWM2		0x49
> +#define MADERA_GP_FN_SPDIF_OUT		0x4C
> +#define MADERA_GP_FN_HEADPHONE_DET	0x50
> +#define MADERA_GP_FN_MIC_DET		0x58
> +#define MADERA_GP_FN_DRC1_SIGNAL_DETECT	0x80
> +#define MADERA_GP_FN_DRC2_SIGNAL_DETECT	0x81
> +#define MADERA_GP_FN_ASRC1_IN1_LOCK	0x88
> +#define MADERA_GP_FN_ASRC1_IN2_LOCK	0x89
> +#define MADERA_GP_FN_ASRC2_IN1_LOCK	0x8A
> +#define MADERA_GP_FN_ASRC2_IN2_LOCK	0x8B
> +#define MADERA_GP_FN_DSP_IRQ1		0xA0
> +#define MADERA_GP_FN_DSP_IRQ2		0xA1
> +#define MADERA_GP_FN_DSP_IRQ3		0xA2
> +#define MADERA_GP_FN_DSP_IRQ4		0xA3
> +#define MADERA_GP_FN_DSP_IRQ5		0xA4
> +#define MADERA_GP_FN_DSP_IRQ6		0xA5
> +#define MADERA_GP_FN_DSP_IRQ7		0xA6
> +#define MADERA_GP_FN_DSP_IRQ8		0xA7
> +#define MADERA_GP_FN_DSP_IRQ9		0xA8
> +#define MADERA_GP_FN_DSP_IRQ10		0xA9
> +#define MADERA_GP_FN_DSP_IRQ11		0xAA
> +#define MADERA_GP_FN_DSP_IRQ12		0xAB
> +#define MADERA_GP_FN_DSP_IRQ13		0xAC
> +#define MADERA_GP_FN_DSP_IRQ14		0xAD
> +#define MADERA_GP_FN_DSP_IRQ15		0xAE
> +#define MADERA_GP_FN_DSP_IRQ16		0xAF
> +#define MADERA_GP_FN_HPOUT1L_SC		0xB0
> +#define MADERA_GP_FN_HPOUT1R_SC		0xB1
> +#define MADERA_GP_FN_HPOUT2L_SC		0xB2
> +#define MADERA_GP_FN_HPOUT2R_SC		0xB3
> +#define MADERA_GP_FN_HPOUT3L_SC		0xB4
> +#define MADERA_GP_FN_HPOUT4R_SC		0xB5
> +#define MADERA_GP_FN_SPKOUTL_SC		0xB6
> +#define MADERA_GP_FN_SPKOUTR_SC		0xB7
> +#define MADERA_GP_FN_HPOUT1L_ENA	0xC0
> +#define MADERA_GP_FN_HPOUT1R_ENA	0xC1
> +#define MADERA_GP_FN_HPOUT2L_ENA	0xC2
> +#define MADERA_GP_FN_HPOUT2R_ENA	0xC3
> +#define MADERA_GP_FN_HPOUT3L_ENA	0xC4
> +#define MADERA_GP_FN_HPOUT4R_ENA	0xC5
> +#define MADERA_GP_FN_SPKOUTL_ENA	0xC6
> +#define MADERA_GP_FN_SPKOUTR_ENA	0xC7
> +#define MADERA_GP_FN_HPOUT1L_DIS	0xD0
> +#define MADERA_GP_FN_HPOUT1R_DIS	0xD1
> +#define MADERA_GP_FN_HPOUT2L_DIS	0xD2
> +#define MADERA_GP_FN_HPOUT2R_DIS	0xD3
> +#define MADERA_GP_FN_HPOUT3L_DIS	0xD4
> +#define MADERA_GP_FN_HPOUT4R_DIS	0xD5
> +#define MADERA_GP_FN_SPKOUTL_DIS	0xD6
> +#define MADERA_GP_FN_SPKOUTR_DIS	0xD7
> +#define MADERA_GP_FN_SPK_SHUTDOWN	0xE0
> +#define MADERA_GP_FN_SPK_OVH_SHUTDOWN	0xE1
> +#define MADERA_GP_FN_SPK_OVH_WARN	0xE2
> +#define MADERA_GP_FN_TIMER1_STATUS	0x140
> +#define MADERA_GP_FN_TIMER2_STATUS	0x141
> +#define MADERA_GP_FN_TIMER3_STATUS	0x142
> +#define MADERA_GP_FN_TIMER4_STATUS	0x143
> +#define MADERA_GP_FN_TIMER5_STATUS	0x144
> +#define MADERA_GP_FN_TIMER6_STATUS	0x145
> +#define MADERA_GP_FN_TIMER7_STATUS	0x146
> +#define MADERA_GP_FN_TIMER8_STATUS	0x147
> +#define MADERA_GP_FN_EVENTLOG1_FIFO_STS	0x150
> +#define MADERA_GP_FN_EVENTLOG2_FIFO_STS	0x151
> +#define MADERA_GP_FN_EVENTLOG3_FIFO_STS	0x152
> +#define MADERA_GP_FN_EVENTLOG4_FIFO_STS	0x153
> +#define MADERA_GP_FN_EVENTLOG5_FIFO_STS	0x154
> +#define MADERA_GP_FN_EVENTLOG6_FIFO_STS	0x155
> +#define MADERA_GP_FN_EVENTLOG7_FIFO_STS	0x156
> +#define MADERA_GP_FN_EVENTLOG8_FIFO_STS	0x157
> +
> +struct snd_soc_dapm_context;
> +
> +struct madera {
> +	struct regmap *regmap;
> +	struct regmap *regmap_32bit;
> +
> +	struct device *dev;
> +
> +	enum madera_type type;
> +	unsigned int rev;
> +
> +	struct gpio_desc *reset_gpio;
> +
> +	int num_core_supplies;
> +	struct regulator_bulk_data core_supplies[MADERA_MAX_CORE_SUPPLIES];
> +	struct regulator *dcvdd;
> +	bool internal_dcvdd;
> +
> +	struct madera_pdata pdata;
> +
> +	struct device *irq_dev;
> +	int irq;
> +
> +	unsigned int out_clamp[MADERA_MAX_OUTPUT];
> +	unsigned int out_shorted[MADERA_MAX_OUTPUT];
> +	unsigned int hp_ena;
> +
> +	struct snd_soc_dapm_context *dapm;
> +
> +	struct blocking_notifier_head notifier;
> +};

Please supply a kerneldoc header for this struct.

> +unsigned int madera_get_num_micbias(struct madera *madera);
> +unsigned int madera_get_num_childbias(struct madera *madera,
> +				      unsigned int micbias);
> +
> +const char *madera_name_from_type(enum madera_type type);
> +
> +static inline int madera_call_notifiers(struct madera *madera,
> +					unsigned long event,
> +					void *data)
> +{
> +	return blocking_notifier_call_chain(&madera->notifier, event, data);
> +}
> +#endif
> diff --git a/include/linux/mfd/madera/pdata.h b/include/linux/mfd/madera/pdata.h
> new file mode 100644
> index 0000000..6d930aa
> --- /dev/null
> +++ b/include/linux/mfd/madera/pdata.h
> @@ -0,0 +1,88 @@
> +/*
> + * Platform data for Cirrus Logic Madera codecs
> + *
> + * Copyright 2015-2017 Cirrus Logic
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + */
> +
> +#ifndef MADERA_PDATA_H
> +#define MADERA_PDATA_H
> +
> +#include <linux/kernel.h>
> +#include <linux/regulator/machine.h>
> +

Why the '\n'?

> +#include <linux/regulator/madera-ldo1.h>
> +#include <linux/regulator/madera-micsupp.h>
> +#include <linux/irqchip/irq-madera-pdata.h>
> +#include <sound/madera-pdata.h>

Alphabetical

> +#define MADERA_MAX_MICBIAS		4
> +#define MADERA_MAX_CHILD_MICBIAS	4
> +
> +#define MADERA_MAX_GPSW			2
> +
> +struct pinctrl_map;
> +
> +/** MICBIAS pin configuration */

Kerneldoc comment with no kerneldoc ??

Same as below.

> +struct madera_micbias_pin_pdata {
> +	/** Regulator configuration for pin switch */

Just use Kerneldoc instead.

Same for all of these structs.

> +	struct regulator_init_data init_data;
> +};
> +
> +/** Regulator configuration for an on-chip MICBIAS */
> +struct madera_micbias_pdata {
> +	/** Configuration of the MICBIAS generator */
> +	struct regulator_init_data init_data;
> +
> +	bool ext_cap;    /** External capacitor fitted */
> +
> +	/**
> +	 * Configuration for each output pin from this MICBIAS
> +	 * (Not used on CS47L85 and WM1840)
> +	 */
> +	struct madera_micbias_pin_pdata pin[MADERA_MAX_CHILD_MICBIAS];
> +};
> +
> +struct madera_pdata {
> +	/** GPIO controlling /RESET, if any */
> +	int reset;
> +
> +	/** Substruct of pdata for the LDO1 regulator */
> +	struct madera_ldo1_pdata ldo1;
> +
> +	/** Substruct of pdata for the MICSUPP regulator */
> +	struct madera_micsupp_pdata micsupp;
> +
> +	/** Substruct of pdata for the irqchip driver */
> +	struct madera_irqchip_pdata irqchip;
> +
> +	/** Base GPIO */
> +	int gpio_base;
> +
> +	/**
> +	 * Array of GPIO configurations
> +	 * See Documentation/pinctrl.txt
> +	 */
> +	const struct pinctrl_map *gpio_configs;
> +	int n_gpio_configs;
> +
> +	/** MICBIAS configurations */
> +	struct madera_micbias_pdata micbias[MADERA_MAX_MICBIAS];
> +
> +	/**
> +	 * Substructure of pdata for the ASoC codec driver
> +	 * See include/sound/madera-pdata.h
> +	 */
> +	struct madera_codec_pdata codec;
> +
> +	/**
> +	 * General purpose switch mode setting
> +	 * See the SW1_MODE field in the datasheet for the available values
> +	 */
> +	u32 gpsw[MADERA_MAX_GPSW];
> +};
> +
> +#endif

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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