Re: [PATCH v5 4/6] mfd: tps65219: Add driver for TI TPS65219 PMIC

[jerome Neanne <jneanne@baylibre.com>]

On 31/10/2022 12:13, Biju Das wrote:
> Hi,
> 
>> Subject: [PATCH v5 4/6] mfd: tps65219: Add driver for TI TPS65219 PMIC
>>
>> The TPS65219 is a power management IC PMIC designed to supply a wide range
>> of SoCs in both portable and stationary applications. Any SoC can control
>> TPS65219 over a standard I2C interface.
>>
>> It contains the following components:
>> - Regulators.
>> - Over Temperature warning and Shut down.
>> - GPIOs
>> - Multi Function Pins (MFP)
>> - power-button
>>
>> This patch adds support for tps65219 PMIC. At this time only the
>> functionalities listed below are made available:
>>
>> - Regulators probe and functionalities
>> - warm and cold reset support
>> - SW shutdown support
>> - Regulator warnings via IRQs
>> - Power-button via IRQ
>>
>> Signed-off-by: Jerome Neanne <jneanne@baylibre.com>
>> Signed-off-by: Markus Schneider-Pargmann <msp@baylibre.com>
>> ---
>>   MAINTAINERS                  |   1 +
>>   drivers/mfd/Kconfig          |  14 ++
>>   drivers/mfd/Makefile         |   1 +
>>   drivers/mfd/tps65219.c       | 320 ++++++++++++++++++++++++++++++++
>>   include/linux/mfd/tps65219.h | 345 +++++++++++++++++++++++++++++++++++
>>   5 files changed, 681 insertions(+)
>>   create mode 100644 drivers/mfd/tps65219.c  create mode 100644
>> include/linux/mfd/tps65219.h
>>
>> diff --git a/MAINTAINERS b/MAINTAINERS
>> index f35b29ffd5fb..960df879c635 100644
>> --- a/MAINTAINERS
>> +++ b/MAINTAINERS
>> @@ -14926,6 +14926,7 @@ F:	drivers/mfd/menelaus.c
>>   F:	drivers/mfd/palmas.c
>>   F:	drivers/mfd/tps65217.c
>>   F:	drivers/mfd/tps65218.c
>> +F:	drivers/mfd/tps65219.c
>>   F:	drivers/mfd/tps65910.c
>>   F:	drivers/mfd/twl-core.[ch]
>>   F:	drivers/mfd/twl4030*.c
>> diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig index
>> abb58ab1a1a4..1a846c7dd0c2 100644
>> --- a/drivers/mfd/Kconfig
>> +++ b/drivers/mfd/Kconfig
>> @@ -1576,6 +1576,20 @@ config MFD_TPS65218
>>   	  This driver can also be built as a module.  If so, the module
>>   	  will be called tps65218.
>>
>> +config MFD_TPS65219
>> +	tristate "TI TPS65219 Power Management IC"
>> +	depends on I2C && OF
>> +	select MFD_CORE
>> +	select REGMAP_I2C
>> +	select REGMAP_IRQ
>> +	help
>> +	  If you say yes here you get support for the TPS65219 series of
>> Power
>> +	  Management ICs. These include voltage regulators, GPIOs and
>> +	  push/power button that are often used in portable devices.
>> +
>> +	  This driver can also be built as a module. If so, the module
>> +	  will be called tps65219.
>> +
>>   config MFD_TPS6586X
>>   	bool "TI TPS6586x Power Management chips"
>>   	depends on I2C=y
>> diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile index
>> 858cacf659d6..a8ff3d6ea3ab 100644
>> --- a/drivers/mfd/Makefile
>> +++ b/drivers/mfd/Makefile
>> @@ -101,6 +101,7 @@ obj-$(CONFIG_TPS6507X)		+= tps6507x.o
>>   obj-$(CONFIG_MFD_TPS65086)	+= tps65086.o
>>   obj-$(CONFIG_MFD_TPS65217)	+= tps65217.o
>>   obj-$(CONFIG_MFD_TPS65218)	+= tps65218.o
>> +obj-$(CONFIG_MFD_TPS65219)	+= tps65219.o
>>   obj-$(CONFIG_MFD_TPS65910)	+= tps65910.o
>>   obj-$(CONFIG_MFD_TPS65912)	+= tps65912-core.o
>>   obj-$(CONFIG_MFD_TPS65912_I2C)	+= tps65912-i2c.o
>> diff --git a/drivers/mfd/tps65219.c b/drivers/mfd/tps65219.c new file mode
>> 100644 index 000000000000..c1638483e069
>> --- /dev/null
>> +++ b/drivers/mfd/tps65219.c
>> @@ -0,0 +1,320 @@
>> +// SPDX-License-Identifier: GPL-2.0
>> +//
>> +// Driver for TPS65219 Integrated Power Management Integrated Chips
>> +(PMIC) // // Copyright (C) 2022 BayLibre Incorporated -
>> +
>> +#include <linux/device.h>
>> +#include <linux/err.h>
>> +#include <linux/i2c.h>
>> +#include <linux/init.h>
>> +#include <linux/interrupt.h>
>> +#include <linux/irq.h>
>> +#include <linux/kernel.h>
>> +#include <linux/module.h>
>> +#include <linux/of_device.h>
>> +#include <linux/of.h>
>> +#include <linux/platform_device.h>
>> +#include <linux/reboot.h>
>> +#include <linux/regmap.h>
>> +#include <linux/slab.h>
> 
> Do you need all the includes??
>
No! you're right, I'll remove not needed.
>> +
>> +#include <linux/mfd/core.h>
>> +#include <linux/mfd/tps65219.h>
>> +
>> +static int tps65219_warm_reset(struct tps65219 *tps) {
>> +	return regmap_update_bits(tps->regmap, TPS65219_REG_MFP_CTRL,
>> +				  TPS65219_MFP_WARM_RESET_I2C_CTRL_MASK,
>> +				  TPS65219_MFP_WARM_RESET_I2C_CTRL_MASK);
>> +}
>> +
>> +static int tps65219_cold_reset(struct tps65219 *tps) {
>> +	return regmap_update_bits(tps->regmap, TPS65219_REG_MFP_CTRL,
>> +				  TPS65219_MFP_COLD_RESET_I2C_CTRL_MASK,
>> +				  TPS65219_MFP_COLD_RESET_I2C_CTRL_MASK);
>> +}
>> +
>> +static int tps65219_soft_shutdown(struct tps65219 *tps) {
>> +	return regmap_update_bits(tps->regmap, TPS65219_REG_MFP_CTRL,
>> +				  TPS65219_MFP_I2C_OFF_REQ_MASK,
>> +				  TPS65219_MFP_I2C_OFF_REQ_MASK);
>> +}
>> +
>> +static int tps65219_restart(struct notifier_block *this,
>> +			    unsigned long reboot_mode, void *cmd) {
>> +	struct tps65219 *tps;
>> +
>> +	tps = container_of(this, struct tps65219, nb);
>> +	if (!tps) {
>> +		pr_err("tps65219: Restarting failed because the pointer to
>> tps65219 is invalid\n");
> Why not dev_error?
Because I can't get correct device then: if !tps, I can't get tps->dev 
Then can't reference device in dev_error. Do you have a better 
suggestion than this pr_err?

Best regards,
Jerome.