linux-kernel - Re: [PATCH v4 04/15] dt-bindings: gpio: Add AXP192 GPIO bindings

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Date:   Sun, 03 Jul 2022 12:31:16 +0100
From:   Aidan MacDonald <aidanmacdonald.0x0@...il.com>
To:     Samuel Holland <samuel@...lland.org>
Cc:     wens@...e.org, linus.walleij@...aro.org, brgl@...ev.pl,
        robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        jic23@...nel.org, sre@...nel.org, lee.jones@...aro.org,
        lgirdwood@...il.com, broonie@...nel.org, lars@...afoo.de,
        quic_gurus@...cinc.com, sebastian.reichel@...labora.com,
        andy.shevchenko@...il.com, michael@...le.cc, rdunlap@...radead.org,
        linux-gpio@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-iio@...r.kernel.org,
        linux-pm@...r.kernel.org
Subject: Re: [PATCH v4 04/15] dt-bindings: gpio: Add AXP192 GPIO bindings


Samuel Holland <samuel@...lland.org> writes:

> On 6/29/22 9:30 AM, Aidan MacDonald wrote:
>> The AXP192 PMIC is different enough from the PMICs supported by
>> the AXP20x GPIO driver to warrant a separate driver. The AXP192
>> driver also supports interrupts and pinconf settings.
>> 
>> Signed-off-by: Aidan MacDonald <aidanmacdonald.0x0@...il.com>
>> ---
>>  .../bindings/gpio/x-powers,axp192-gpio.yaml   | 68 +++++++++++++++++++
>>  1 file changed, 68 insertions(+)
>>  create mode 100644 Documentation/devicetree/bindings/gpio/x-powers,axp192-gpio.yaml
>> 
>> diff --git a/Documentation/devicetree/bindings/gpio/x-powers,axp192-gpio.yaml
>> b/Documentation/devicetree/bindings/gpio/x-powers,axp192-gpio.yaml
>> new file mode 100644
>> index 000000000000..ceb94aa2bc97
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/gpio/x-powers,axp192-gpio.yaml
>> [...]
>> +
>> +required:
>> +  - compatible
>> +  - "#gpio-cells"
>> +  - gpio-controller
>> +  - gpio-ranges
>
> By requiring the gpio-ranges property, you will not be able to convert the
> existing driver, as existing devicetrees do not have it.
>
> If you instead call pinctrl_add_gpio_range() from the driver, you can maintain
> compatibility with the existing binding.
>
> Regards,
> Samuel

Originally I did use pinctrl_add_gpio_range(), but calling that from
a pin control driver is apparently deprecated. It can be done from
->of_gpio_ranges_fallback to deal with old device trees, though.