On Tue, 14 Jun 2022, Satya Priya wrote:
> Use i2c_new_dummy_device() to register pm8008-regulator
> client present at a different address space, instead of
> defining a separate DT node. This avoids calling the probe
> twice for the same chip, once for each client pm8008-infra
> and pm8008-regulator.
>
> As a part of this define pm8008_regmap_init() to do regmap
> init for both the clients and define pm8008_get_regmap() to
> pass the regmap to the regulator driver.
>
> Signed-off-by: Satya Priya <quic_c_skakit@xxxxxxxxxxx>
> Reviewed-by: Stephen Boyd <swboyd@xxxxxxxxxxxx>
> ---
> Changes in V15:
> - None.
>
> Changes in V14:
> - None.
>
> Changes in V13:
> - None.
>
> drivers/mfd/qcom-pm8008.c | 34 ++++++++++++++++++++++++++++++++--
> include/linux/mfd/qcom_pm8008.h | 9 +++++++++
> 2 files changed, 41 insertions(+), 2 deletions(-)
> create mode 100644 include/linux/mfd/qcom_pm8008.h
>
> diff --git a/drivers/mfd/qcom-pm8008.c b/drivers/mfd/qcom-pm8008.c
> index 569ffd50..55e2a8e 100644
> --- a/drivers/mfd/qcom-pm8008.c
> +++ b/drivers/mfd/qcom-pm8008.c
> @@ -9,6 +9,7 @@
> #include <linux/interrupt.h>
> #include <linux/irq.h>
> #include <linux/irqdomain.h>
> +#include <linux/mfd/qcom_pm8008.h>
> #include <linux/module.h>
> #include <linux/of_device.h>
> #include <linux/of_platform.h>
> @@ -57,6 +58,7 @@ enum {
>
> struct pm8008_data {
> struct device *dev;
> + struct regmap *regulators_regmap;
> int irq;
> struct regmap_irq_chip_data *irq_data;
> };
> @@ -150,6 +152,12 @@ static struct regmap_config qcom_mfd_regmap_cfg = {
> .max_register = 0xFFFF,
> };
>
> +struct regmap *pm8008_get_regmap(const struct pm8008_data *chip)
> +{
> + return chip->regulators_regmap;
> +}
> +EXPORT_SYMBOL_GPL(pm8008_get_regmap);
Seems like abstraction for the sake of abstraction.
Why not do the dereference inside the regulator driver?
> static int pm8008_init(struct regmap *regmap)
> {
> int rc;
> @@ -217,11 +225,25 @@ static int pm8008_probe_irq_peripherals(struct pm8008_data *chip,
> return 0;
> }
>
> +static struct regmap *pm8008_regmap_init(struct i2c_client *client,
> + struct pm8008_data *chip)
> +{
> + struct regmap *regmap;
> +
> + regmap = devm_regmap_init_i2c(client, &qcom_mfd_regmap_cfg);
> + if (!regmap)
> + return NULL;
> +
> + i2c_set_clientdata(client, chip);
> + return regmap;
> +}
This function seems superfluous.
It's only called once and it contains a single call.
Just pop the call directly into probe.
> static int pm8008_probe(struct i2c_client *client)
> {
> int rc;
> struct pm8008_data *chip;
> struct gpio_desc *reset_gpio;
> + struct i2c_client *regulators_client;
> struct regmap *regmap;
>
> chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
> @@ -229,11 +251,19 @@ static int pm8008_probe(struct i2c_client *client)
> return -ENOMEM;
>
> chip->dev = &client->dev;
> - regmap = devm_regmap_init_i2c(client, &qcom_mfd_regmap_cfg);
> + regmap = pm8008_regmap_init(client, chip);
> if (!regmap)
> return -ENODEV;
>
> - i2c_set_clientdata(client, chip);
> + regulators_client = i2c_new_dummy_device(client->adapter, client->addr + 1);
> + if (IS_ERR(regulators_client)) {
> + dev_err(&client->dev, "can't attach client\n");
> + return PTR_ERR(regulators_client);
> + }
> +
> + chip->regulators_regmap = pm8008_regmap_init(regulators_client, chip);
> + if (!chip->regulators_regmap)
> + return -ENODEV;
>
> reset_gpio = devm_gpiod_get(chip->dev, "reset", GPIOD_OUT_LOW);
> if (IS_ERR(reset_gpio))
> diff --git a/include/linux/mfd/qcom_pm8008.h b/include/linux/mfd/qcom_pm8008.h
> new file mode 100644
> index 0000000..3814bff
> --- /dev/null
> +++ b/include/linux/mfd/qcom_pm8008.h
> @@ -0,0 +1,9 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +// Copyright (c) 2022 Qualcomm Innovation Center, Inc. All rights reserved.
> +#ifndef __QCOM_PM8008_H__
> +#define __QCOM_PM8008_H__
> +
> +struct pm8008_data;
> +struct regmap *pm8008_get_regmap(const struct pm8008_data *chip);
> +
> +#endif
--
Lee Jones [李琼斯]
Principal Technical Lead - Developer Services
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