linux-kernel - Re: [PATCH V5 4/5] gpio: max77620: add gpio driver for MAX77620/MAX20024

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Date:	Mon, 1 Feb 2016 08:32:28 +0000
From:	Lee Jones <lee.jones@...aro.org>
To:	Rob Herring <robh@...nel.org>
Cc:	Laxman Dewangan <ldewangan@...dia.com>, pawel.moll@....com,
	mark.rutland@....com, ijc+devicetree@...lion.org.uk,
	galak@...eaurora.org, linus.walleij@...aro.org, gnurou@...il.com,
	broonie@...nel.org, a.zummo@...ertech.it,
	alexandre.belloni@...e-electrons.com, lgirdwood@...il.com,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-gpio@...r.kernel.org, rtc-linux@...glegroups.com,
	swarren@...dia.com, treding@...dia.com, k.kozlowski@...sung.com,
	Chaitanya Bandi <bandik@...dia.com>
Subject: Re: [PATCH V5 4/5] gpio: max77620: add gpio driver for
 MAX77620/MAX20024

On Fri, 29 Jan 2016, Rob Herring wrote:

> On Wed, Jan 27, 2016 at 07:40:07PM +0530, Laxman Dewangan wrote:
> > MAXIM Semiconductor's PMIC, MAX77620/MAX20024 has 8 GPIO
> > pins. It also supports interrupts from these pins.
> > 
> > Add GPIO driver for these pins to control via GPIO APIs.
> > 
> > Signed-off-by: Laxman Dewangan <ldewangan@...dia.com>
> > Signed-off-by: Chaitanya Bandi <bandik@...dia.com>
> > ---
> > Changes from V1:
> > - Use the gpiochip_add_data and get the chip data from core APIs.
> > - Cleanups based on comment received on mfd/rtc.
> > - Avoid duplication on error message.
> > 
> > Changes form V2:
> > - Run coccicheck and checkpatch in strict mode for the alignment.
> > - update based on api changes from core.
> > 
> > Changes from V3: 
> > - Change all sys initcall to module driver.
> > - change the max77620_read argument to unisgned int from u8.
> > 
> > Changes from V4: 
> > - Added DT binding document as devicetree/bindings/gpio/gpio-max77620.txt
> > 
> >  .../devicetree/bindings/gpio/gpio-max77620.txt     |  25 ++
> >  drivers/gpio/Kconfig                               |   9 +
> >  drivers/gpio/Makefile                              |   1 +
> >  drivers/gpio/gpio-max77620.c                       | 292 +++++++++++++++++++++
> >  4 files changed, 327 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/gpio/gpio-max77620.txt
> >  create mode 100644 drivers/gpio/gpio-max77620.c
> > 
> > diff --git a/Documentation/devicetree/bindings/gpio/gpio-max77620.txt b/Documentation/devicetree/bindings/gpio/gpio-max77620.txt
> > new file mode 100644
> > index 0000000..410e716
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/gpio/gpio-max77620.txt
> > @@ -0,0 +1,25 @@
> > +GPIO driver for MAX77620 Power management IC from Maxim Semiconductor.
> > +
> > +Device has 8 GPIO pins which can be configured as GPIO as well as the
> > +special IO functions.
> > +
> > +Required properties:
> > +-------------------
> > +- gpio-controller : 	Marks the device node as a gpio controller.
> > +- #gpio-cells : 	Should be two.  The first cell is the pin number and
> > +			the second cell is used to specify the gpio polarity:
> > +				0 = active high
> > +				1 = active low
> > +For more details, please refer generic GPIO DT binding document
> > +<devicetree/bindings/gpio/gpio.txt>.
> 
> I would just fold these 2 properties into the main max77620 document.

As these are simple/generic options, I'm happy to support that.

Also happy to support them staying in their own subsystem doc
i.e. this one, for consistency.

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