linux-kernel - Re: [PATCH 6/6] dt-bindings: misc: correct the property name cmd-gpios to cmd-gpio

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Message-ID: <CAL_JsqJKOeZybxnu+Z2ugaGwebrnbtmJ8n0st-=n3NbAf9_pyw@mail.gmail.com>
Date:   Fri, 16 Oct 2020 09:13:49 -0500
From:   Rob Herring <robh@...nel.org>
To:     "Leizhen (ThunderTown)" <thunder.leizhen@...wei.com>
Cc:     Dan Murphy <dmurphy@...com>, Pavel Machek <pavel@....cz>,
        linux-leds <linux-leds@...r.kernel.org>,
        Lee Jones <lee.jones@...aro.org>,
        Benson Leung <bleung@...omium.org>,
        Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        Guenter Roeck <groeck@...omium.org>,
        Mark Brown <broonie@...nel.org>,
        linux-spi <linux-spi@...r.kernel.org>,
        Lubomir Rintel <lkundrak@...sk>,
        devicetree <devicetree@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 6/6] dt-bindings: misc: correct the property name
 cmd-gpios to cmd-gpio

On Wed, Oct 14, 2020 at 10:23 PM Leizhen (ThunderTown)
<thunder.leizhen@...wei.com> wrote:
>
>
>
> On 2020/10/14 21:50, Rob Herring wrote:
> > On Wed, Oct 14, 2020 at 09:29:26AM +0800, Leizhen (ThunderTown) wrote:
> >>
> >>
> >> On 2020/10/14 1:32, Dan Murphy wrote:
> >>> Zhen
> >>>
> >>> On 10/13/20 11:08 AM, Zhen Lei wrote:
> >>>> The property name used in arch/arm/boot/dts/mmp2-olpc-xo-1-75.dts is
> >>>> cmd-gpio.
> >>>>
> >>>> arch/arm/boot/dts/mmp2-olpc-xo-1-75.dts:235:
> >>>> cmd-gpio = <&gpio 155 GPIO_ACTIVE_HIGH>;
> >>>>
> >>>> Signed-off-by: Zhen Lei <thunder.leizhen@...wei.com>
> >>>> ---
> >>>>   Documentation/devicetree/bindings/misc/olpc,xo1.75-ec.yaml | 6 +++---
> >>>>   1 file changed, 3 insertions(+), 3 deletions(-)
> >>>>
> >>>> diff --git a/Documentation/devicetree/bindings/misc/olpc,xo1.75-ec.yaml b/Documentation/devicetree/bindings/misc/olpc,xo1.75-ec.yaml
> >>>> index b3c45c046ba5e37..c7a06a9650db2ed 100644
> >>>> --- a/Documentation/devicetree/bindings/misc/olpc,xo1.75-ec.yaml
> >>>> +++ b/Documentation/devicetree/bindings/misc/olpc,xo1.75-ec.yaml
> >>>> @@ -24,7 +24,7 @@ properties:
> >>>>     compatible:
> >>>>       const: olpc,xo1.75-ec
> >>>>   -  cmd-gpios:
> >>>> +  cmd-gpio:
> >>>
> >>> Preference is gpios not gpio. But Rob H accept or reject
> >>
> >> Look at the search result below. It seems that the driver have not been merged into mainline.
> >
> > Yes, in drivers/platform/olpc/olpc-xo175-ec.c.
> >
> > Your mistake is the gpiod api takes just 'cmd' as the GPIO core handles
> > both forms.
>
> OK, thanks for your information. I have found that it defined by gpio_suffixes[].
>
> >
> >> But the property name is really used as cmd-gpio at mmp2-olpc-xo-1-75.dts:235, I don't think
> >> the mmp2-olpc-xo-1-75.dts can make a mistake. Otherwise, the driver will not work properly.
> >> Meanwhile, Both names cmd-gpios and cmd-gpio seem to be in use. But I prefer cmd-gpio, after
> >> all, only one gpio is assigned now. The motorola,cmd-gpios add "s" because it contains 3 gpio.
> >
> > The preference is it is always '-gpios' just like it's always
> > 'interrupts' or 'clocks'.
> >
> > However, whether to change this is really up to the OLPC folks. Given
> > the driver has always supported both forms, it should be okay to change
> > the dts. Though there could be other users besides the kernel.
>
> If both "cmd-gpios" and "cmd-gpio" are supported, should we use enum to list both
> of them in yaml? or use patternProperties?

No, we pick one or the other. Given Lubomir is okay with a dts change,
we should use just 'cmd-gpios'.

Rob