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

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Date:   Sat, 2 Jul 2022 10:16:41 -0500
From:   Samuel Holland <samuel@...lland.org>
To:     Aidan MacDonald <aidanmacdonald.0x0@...il.com>, wens@...e.org
Cc:     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

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