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

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Message-ID: <49b680f8-d7d7-8ea3-894c-73cbfacc5ba4@huawei.com>
Date:   Thu, 15 Oct 2020 11:23:27 +0800
From:   "Leizhen (ThunderTown)" <thunder.leizhen@...wei.com>
To:     Rob Herring <robh@...nel.org>
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 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?

I'm going to send v2 based on this idea.

> 
> Rob
> 
> .
>