linux-kernel - Re: [PATCH v2 1/1] dt-bindings: misc: add support for both property names cmd-gpios and cmd-gpio

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Date:   Thu, 15 Oct 2020 15:59:28 +0800
From:   "Leizhen (ThunderTown)" <thunder.leizhen@...wei.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
CC:     Rob Herring <robh+dt@...nel.org>, Pavel Machek <pavel@....cz>,
        Dan Murphy <dmurphy@...com>,
        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 v2 1/1] dt-bindings: misc: add support for both property
 names cmd-gpios and cmd-gpio



On 2020/10/15 15:01, Geert Uytterhoeven wrote:
> Hi Zhen,
> 
> Thanks for your patch!
> 
> On Thu, Oct 15, 2020 at 6:52 AM Zhen Lei <thunder.leizhen@...wei.com> wrote:
>> The definition "gpio_suffixes[] = { "gpios", "gpio" }" shows that both
>> property names "cmd-gpios" and "cmd-gpio" are supported. But currently
>> only "cmd-gpios" is allowed in this yaml, and the name used in
>> mmp2-olpc-xo-1-75.dts is cmd-gpio. As a result, the following errors is
>> reported.
>>
>> slave: 'cmd-gpios' is a required property
>> slave: 'cmd-gpio' does not match any of the regexes: 'pinctrl-[0-9]+'
>>
>> Signed-off-by: Zhen Lei <thunder.leizhen@...wei.com>
>> ---
>>  Documentation/devicetree/bindings/misc/olpc,xo1.75-ec.yaml | 14 ++++++++++----
>>  1 file changed, 10 insertions(+), 4 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..dd549380a085709 100644
>> --- a/Documentation/devicetree/bindings/misc/olpc,xo1.75-ec.yaml
>> +++ b/Documentation/devicetree/bindings/misc/olpc,xo1.75-ec.yaml
>> @@ -24,15 +24,21 @@ properties:
>>    compatible:
>>      const: olpc,xo1.75-ec
>>
>> -  cmd-gpios:
>> +  spi-cpha: true
>> +
>> +patternProperties:
>> +  "^cmd-gpio[s]?$":
>>      description: GPIO uspecifier of the CMD pin
>>      maxItems: 1
> 
> In general, the *-gpio form is deprecated.  So why complicate the DT
> bindings by adding support for deprecated properties?

I just don't know this information. So this patch can be ignored.

> 
>   1. Explicitly allowing deprecated properties means new users may be
>      added,
>   2. Once all in-tree DTS files are converted, the warnings will be gone
>      anyway,
>   3. Out-of-tree DTB will still work, as it's very unlikely support for
>      the "gpio" suffix can/will be dropped anytime soon,
>   4. If anyone runs the validator on out-of-tree DTS files, the most
>      probable intention is to fix any detected issues anyway, and the
>      files can be updated, too,
>   5. If any out-of-tree code or tooling relies on the *-gpio form, it
>      may already be broken.
> 
>> -  spi-cpha: true
>> -
>>  required:
>>    - compatible
>> -  - cmd-gpios
>> +
>> +oneOf:
>> +  - required:
>> +      - cmd-gpio
>> +  - required:
>> +      - cmd-gpios
>>
>>  additionalProperties: false
> 
> Gr{oetje,eeting}s,
> 
>                         Geert
>