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

[Biju Das <biju.das.jz@bp.renesas.com>]

> Subject: Re: [PATCH v5 4/6] mfd: tps65219: Add driver for TI TPS65219
> PMIC
> 
> 
> 
> 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 -
> >> +
> >> +
> >> +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?

How container_of can fail?

Cheers,
Biju