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

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Message-ID: <20220607151703.GB3254370-robh@kernel.org>
Date:   Tue, 7 Jun 2022 09:17:03 -0600
From:   Rob Herring <robh@...nel.org>
To:     Aidan MacDonald <aidanmacdonald.0x0@...il.com>
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

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