Re: [PATCH v2 3/4] mfd: tps65917: Add driver for the TPS65917 PMIC

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Hi Nishanth,

On Tuesday 20 May 2014 07:45 PM, Nishanth Menon wrote:
On 05/20/2014 04:11 AM, Keerthy wrote:
[...]
+config MFD_TPS65917
+	bool "TI TPS65917 series chips"
+	select MFD_CORE
+	select REGMAP_I2C
+	select REGMAP_IRQ
+	depends on I2C=y
^^ why =y?
Palmas derived. I will knock off the 'y'

+	help
+	  If you say yes here you get support for the TPS65917
+	  PMIC chips from Texas Instruments. The device provides
+	  5 confgurable SPMSs and 5 LDOs, thermal protection module,
+	  GPADC.
+
  config MFD_TPS80031
  	bool "TI TPS80031/TPS80032 Power Management chips"
  	depends on I2C=y
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 2851275..248a60b 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -69,6 +69,7 @@ tps65912-objs                   := tps65912-core.o tps65912-irq.o
  obj-$(CONFIG_MFD_TPS65912)	+= tps65912.o
  obj-$(CONFIG_MFD_TPS65912_I2C)	+= tps65912-i2c.o
  obj-$(CONFIG_MFD_TPS65912_SPI)  += tps65912-spi.o
+obj-$(CONFIG_MFD_TPS65917)	+= tps65917.o
  obj-$(CONFIG_MFD_TPS80031)	+= tps80031.o
  obj-$(CONFIG_MENELAUS)		+= menelaus.o
diff --git a/drivers/mfd/tps65917.c b/drivers/mfd/tps65917.c
new file mode 100644
index 0000000..dbd67c5
--- /dev/null
+++ b/drivers/mfd/tps65917.c
@@ -0,0 +1,573 @@
+/*
+ * TI TPS65917 Integrated power management chipsets
+ *
+ * Copyright (C) 2014 Texas Instruments Incorporated - http://www.ti.com/
+ *
+ * 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.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether expressed or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License version 2 for more details.
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/regmap.h>
+#include <linux/err.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/tps65917.h>
+#include <linux/of_device.h>
<snip>
+
+static int tps65917_voltaile_regs[] = {
+	TPS65917_SMPS1_CTRL,
+	TPS65917_SMPS2_CTRL,
+	TPS65917_SMPS3_CTRL,
+	TPS65917_SMPS4_CTRL,
+	TPS65917_SMPS5_CTRL,
+	TPS65917_LDO1_CTRL,
+	TPS65917_LDO2_CTRL,
+	TPS65917_LDO3_CTRL,
+	TPS65917_LDO4_CTRL,
+	TPS65917_LDO5_CTRL,
+};
+
+static bool is_volatile_reg(struct device *dev, unsigned int reg)
+{
+	int i;
+
+	/*
+	 * Caching all the required regulator registers.
+	 */
+
+	for (i = 0; i < 11; i++)
+		if (reg == tps65917_voltaile_regs[i])
+			return true;
+
+	return false;
+}
+
+static const struct regmap_config tps65917_regmap_config[TPS65917_NUM_CLIENTS] = {
+	{
+		.reg_bits = 8,
+		.val_bits = 8,
+		.volatile_reg = is_volatile_reg,
+		.cache_type = REGCACHE_NONE,
Assume you wanted cached here, since you are marking certain registers
as volatile?
[...]

Yes. I will correct this.

+};
+
+int tps65917_ext_control_req_config(struct tps65917 *tps65917,
+				    enum tps65917_external_requestor_id id,
+				    int ext_ctrl, bool enable)
+{
kernel doc style documentation
[...]

+static struct tps65917 *tps65917_dev;
+
+static const struct of_device_id of_tps65917_match_tbl[] = {
+	{
+		.compatible = "ti,tps65917",
+	},
+	{ },
+};
+MODULE_DEVICE_TABLE(of, of_tps65917_match_tbl);
+
+static int tps65917_i2c_probe(struct i2c_client *i2c,
+			      const struct i2c_device_id *id)
+{
[...]
+	/*
+	 * If we are probing with DT do this the DT way and return here
+	 * otherwise continue and add devices using mfd helpers.
+	 */
+	if (node) {
+		ret = of_platform_populate(node, NULL, NULL, &i2c->dev);
+		if (ret < 0)
+			goto err_irq;
+		else if (pdata->pm_off && !pm_power_off)
+			tps65917_dev = tps65917;
and where is the actual power off function?

I will add that.


+	}
+
+	return ret;
+
+err_irq:
+	regmap_del_irq_chip(tps65917->irq, tps65917->irq_data);
+err_i2c:
+	for (i = 1; i < TPS65917_NUM_CLIENTS; i++) {
+		if (tps65917->i2c_clients[i])
+			i2c_unregister_device(tps65917->i2c_clients[i]);
+	}
+	return ret;
+}
+
+static int tps65917_i2c_remove(struct i2c_client *i2c)
+{
+	struct tps65917 *tps65917 = i2c_get_clientdata(i2c);
+	int i;
+
+	regmap_del_irq_chip(tps65917->irq, tps65917->irq_data);
+
+	for (i = 1; i < TPS65917_NUM_CLIENTS; i++) {
+		if (tps65917->i2c_clients[i])
+			i2c_unregister_device(tps65917->i2c_clients[i]);
+	}
+
+	return 0;
+}
+
+static const struct i2c_device_id tps65917_i2c_id[] = {
+	{ "tps65917", },
+};
+MODULE_DEVICE_TABLE(i2c, tps65917_i2c_id);
+
+static struct i2c_driver tps65917_i2c_driver = {
+	.driver = {
+		   .name = "tps65917",
+		   .of_match_table = of_tps65917_match_tbl,
+		   .owner = THIS_MODULE,
+	},
+	.probe = tps65917_i2c_probe,
+	.remove = tps65917_i2c_remove,
+	.id_table = tps65917_i2c_id,
+};
+
+static int __init tps65917_i2c_init(void)
+{
+	return i2c_add_driver(&tps65917_i2c_driver);
+}
+/* init early so consumer devices can complete system boot */
+subsys_initcall(tps65917_i2c_init);
Should we let them just defer?

[...]

Guess most drivers in the mfd folder use subsys_initcall


diff --git a/include/linux/mfd/tps65917.h b/include/linux/mfd/tps65917.h
new file mode 100644
index 0000000..8232e22
--- /dev/null
+++ b/include/linux/mfd/tps65917.h
+
+struct tps65917 {
+	struct device *dev;
+
+	struct i2c_client *i2c_clients[TPS65917_NUM_CLIENTS];
+	struct regmap *regmap[TPS65917_NUM_CLIENTS];
+
+	/* Stored chip id */
+	int id;
+
+	struct tps65917_pmic *pmic;
+
+	/* IRQ Data */
+	int irq;
+	u32 irq_mask;
+	/* mutext for irq */
+	struct mutex irq_lock;
+	struct regmap_irq_chip_data *irq_data;
+};
For all structures, could you use kerneldoc style documentation?
See: Documentation/kernel-doc-nano-HOWTO.txt +273


+static inline int tps65917_read(struct tps65917 *tps65917, unsigned int base,
+				unsigned int reg, unsigned int *val)
Again for all functions expected to be called by other driver(such as
regulator) to mfd, kernel-doc style documentation?

[...]

Ok.

Thanks,
Keerthy
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