linux-kernel - Re: [PATCH 05/10] dt-bindings: gpio: Add AXP192 GPIO bindings

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Date:   Tue, 07 Jun 2022 16:40:55 +0100
From:   Aidan MacDonald <aidanmacdonald.0x0@...il.com>
To:     Rob Herring <robh@...nel.org>
Cc:     linus.walleij@...aro.org, brgl@...ev.pl,
        krzysztof.kozlowski+dt@...aro.org, wens@...e.org, jic23@...nel.org,
        lee.jones@...aro.org, sre@...nel.org, broonie@...nel.org,
        gregkh@...uxfoundation.org, lgirdwood@...il.com, lars@...afoo.de,
        rafael@...nel.org, linux-gpio@...r.kernel.org,
        devicetree@...r.kernel.org, linux-iio@...r.kernel.org,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 05/10] dt-bindings: gpio: Add AXP192 GPIO bindings


Rob Herring <robh@...nel.org> writes:

> On Tue, Jun 07, 2022 at 11:34:19AM +0100, Aidan MacDonald wrote:
>> 
>> Rob Herring <robh@...nel.org> writes:
>> 
>> > On Fri, Jun 03, 2022 at 02:57:09PM +0100, 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   | 59 +++++++++++++++++++
>> >>  1 file changed, 59 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..7a985640ade8
>> >> --- /dev/null
>> >> +++ b/Documentation/devicetree/bindings/gpio/x-powers,axp192-gpio.yaml
>> >> @@ -0,0 +1,59 @@
>> >> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
>> >> +%YAML 1.2
>> >> +---
>> >> +$id: "http://devicetree.org/schemas/gpio/x-powers,axp192-gpio.yaml#"
>> >> +$schema: "http://devicetree.org/meta-schemas/core.yaml#"
>> >> +
>> >> +title: X-Powers AXP192 GPIO Device Tree Bindings
>> >> +
>> >> +maintainers:
>> >> +  - Chen-Yu Tsai <wens@...e.org>
>> >> +
>> >> +properties:
>> >> +  "#gpio-cells":
>> >> +    const: 2
>> >> +    description: >
>> >> +      The first cell is the pin number and the second is the GPIO flags.
>> >> +
>> >> +  compatible:
>> >> +    oneOf:
>> >> +      - enum:
>> >
>> > No need for 'oneOf' with only 1 entry.
>> >
>> 
>> Got it.
>> 
>> >> +          - x-powers,axp192-gpio
>> >> +
>> >> +  gpio-controller: true
>> >> +
>> >> +patternProperties:
>> >> +  "^.*-pins?$":
>> >
>> > You can omit '^.*'
>> >
>> > Why does 's' need to be optional?
>> >
>> 
>> TBH I just copied this from x-powers,axp209-gpio.yaml. A similar pattern
>> is used in a few other bindings, eg. allwinner,sun4i-a10-pinctrl.yaml.
>> I guess it's to allow the node names to sound more natural when there's
>> only one pin.
>
> Those cases were for compatibility with existing users. That shouldn't 
> be the case here.
>
> Rob

OK, thanks for the clarification. I will use '-pins$' then.