linux-kernel - Re: [PATCH v3 4/6] [media] c8sectpfe: Update binding to reset-gpios

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Message-ID: <20150901090916.GM4796@x1>
Date:	Tue, 1 Sep 2015 10:09:16 +0100
From:	Lee Jones <lee.jones@...aro.org>
To:	Javier Martinez Canillas <javier@...hile0.org>
Cc:	Peter Griffin <peter.griffin@...aro.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	srinivas.kandagatla@...il.com, maxime.coquelin@...com,
	patrice.chotard@...com,
	Mauro Carvalho Chehab <mchehab@....samsung.com>,
	linux-media@...r.kernel.org,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	valentinrothberg@...il.com, hugues.fruchet@...com
Subject: Re: [PATCH v3 4/6] [media] c8sectpfe: Update binding to reset-gpios

On Tue, 01 Sep 2015, Javier Martinez Canillas wrote:
> On Fri, Aug 28, 2015 at 7:52 PM, Peter Griffin <peter.griffin@...aro.org> wrote:
> > gpio.txt documents that GPIO properties should be named
> > "[<name>-]gpios", with <name> being the purpose of this
> > GPIO for the device.
> >
> > This change has been done as one atomic commit.
> >
> > Signed-off-by: Peter Griffin <peter.griffin@...aro.org>
> > Acked-by: Lee Jones <lee.jones@...aro.org>
> > ---
> >  Documentation/devicetree/bindings/media/stih407-c8sectpfe.txt | 6 +++---
> >  arch/arm/boot/dts/stihxxx-b2120.dtsi                          | 4 ++--
> >  drivers/media/platform/sti/c8sectpfe/c8sectpfe-core.c         | 2 +-
> >  3 files changed, 6 insertions(+), 6 deletions(-)
> >
> > diff --git a/Documentation/devicetree/bindings/media/stih407-c8sectpfe.txt b/Documentation/devicetree/bindings/media/stih407-c8sectpfe.txt
> > index d4def76..e70d840 100644
> > --- a/Documentation/devicetree/bindings/media/stih407-c8sectpfe.txt
> > +++ b/Documentation/devicetree/bindings/media/stih407-c8sectpfe.txt
> > @@ -35,7 +35,7 @@ Required properties (tsin (child) node):
> >
> >  - tsin-num     : tsin id of the InputBlock (must be between 0 to 6)
> >  - i2c-bus      : phandle to the I2C bus DT node which the demodulators & tuners on this tsin channel are connected.
> > -- rst-gpio     : reset gpio for this tsin channel.
> > +- reset-gpios  : reset gpio for this tsin channel.
> 
> The documentation is a bit outdated, the GPIO subsystem supports both
> -gpio and -gpios, see commit:
> 
> dd34c37aa3e8 ("gpio: of: Allow -gpio suffix for property names")
> 
> So it makes sense to me to use -gpio instead of -gpios in this case
> since is a single GPIO. Also rst is already a descriptive name since
> that's how many datasheets name a reset pin. I'm not saying I'm
> against this patch, just pointing out since the commit message is a
> bit misleading.

As I suggested this patch, I feel I must comment.

My order of preference would be:

 reset-gpio
 reset-gpios
 rst-gpio
 rst-gpios

This current patch is No2, so it's okay to stay IMHO.

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