linux-kernel - Re: [PATCH 2/6] dt-bindings: pinctrl: mt7620: add proper function muxing binding

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Date:   Wed, 14 Dec 2022 12:55:21 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Arınç ÜNAL <arinc.unal@...nc9.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Sergio Paracuellos <sergio.paracuellos@...il.com>,
        Luiz Angelo Daros de Luca <luizluca@...il.com>
Cc:     linux-gpio@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-mips@...r.kernel.org
Subject: Re: [PATCH 2/6] dt-bindings: pinctrl: mt7620: add proper function
 muxing binding

On 13/12/2022 14:04, Arınç ÜNAL wrote:
> Not every function can be muxed to a group. Add proper binding which
> documents which function can be muxed to a group or set of groups.
> 
> Signed-off-by: Arınç ÜNAL <arinc.unal@...nc9.com>
> ---
>  .../pinctrl/ralink,mt7620-pinctrl.yaml        | 632 +++++++++++++++++-
>  1 file changed, 596 insertions(+), 36 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/pinctrl/ralink,mt7620-pinctrl.yaml b/Documentation/devicetree/bindings/pinctrl/ralink,mt7620-pinctrl.yaml
> index 6f17f3991640..06880c80ba80 100644
> --- a/Documentation/devicetree/bindings/pinctrl/ralink,mt7620-pinctrl.yaml
> +++ b/Documentation/devicetree/bindings/pinctrl/ralink,mt7620-pinctrl.yaml
> @@ -29,47 +29,608 @@ patternProperties:
>          $ref: pinmux-node.yaml#
>  
>          properties:
> -          groups:
> -            description: The pin group to select.
> -            enum: [
> -              # common
> -              i2c, spi, wdt,
> -
> -              # For MT7620 SoC
> -              ephy, mdio, nd_sd, pa, pcie, rgmii1, rgmii2, spi refclk,
> -              uartf, uartlite, wled,
> -
> -              # For MT7628 and MT7688 SoCs
> -              gpio, i2s, p0led_an, p0led_kn, p1led_an, p1led_kn, p2led_an,
> -              p2led_kn, p3led_an, p3led_kn, p4led_an, p4led_kn, perst, pwm0,
> -              pwm1, refclk, sdmode, spi cs1, spis, uart0, uart1, uart2,
> -              wled_an, wled_kn,
> -            ]
> -
>            function:
> -            description: The mux function to select.
> -            enum: [
> -              # common
> -              gpio, i2c, refclk, spi,
> -
> -              # For MT7620 SoC
> -              ephy, gpio i2s, gpio uartf, i2s uartf, mdio, nand, pa,
> -              pcie refclk, pcie rst, pcm gpio, pcm i2s, pcm uartf,
> -              rgmii1, rgmii2, sd, spi refclk, uartf, uartlite, wdt refclk,
> -              wdt rst, wled,
> -
> -              # For MT7628 and MT7688 SoCs
> -              antenna, debug, i2s, jtag, p0led_an, p0led_kn,
> -              p1led_an, p1led_kn, p2led_an, p2led_kn, p3led_an, p3led_kn,
> -              p4led_an, p4led_kn, pcie, pcm, perst, pwm, pwm0, pwm1, pwm_uart2,
> -              rsvd, sdxc, sdxc d5 d4, sdxc d6, sdxc d7, spi cs1,
> -              spis, sw_r, uart0, uart1, uart2, utif, wdt, wled_an, wled_kn, -,
> -            ]
> +            description:
> +              A string containing the name of the function to mux to the group.
> +            anyOf:
> +              - description: For MT7620 SoC
> +                enum: [ephy, gpio, gpio i2s, gpio uartf, i2c, i2s uartf, mdio, nand, pa,
> +                       pcie refclk, pcie rst, pcm gpio, pcm i2s, pcm uartf, refclk,
> +                       rgmii1, rgmii2, sd, spi, spi refclk, uartf, uartlite, wdt refclk,
> +                       wdt rst, wled]
> +
> +              - description: For MT7628 and MT7688 SoCs
> +                enum: [antenna, debug, gpio, i2c, i2s, jtag, p0led_an, p0led_kn,
> +                       p1led_an, p1led_kn, p2led_an, p2led_kn, p3led_an, p3led_kn,
> +                       p4led_an, p4led_kn, pcie, pcm, perst, pwm, pwm0, pwm1, pwm_uart2,
> +                       refclk, rsvd, sdxc, sdxc d5 d4, sdxc d6, sdxc d7, spi, spi cs1,
> +                       spis, sw_r, uart0, uart1, uart2, utif, wdt, wled_an, wled_kn, -]
> +
> +          groups:
> +            description:
> +              An array of strings. Each string contains the name of a group.
>  
>          required:
>            - groups
>            - function
>  
> +        allOf:
> +          - if:
> +              properties:
> +                function:
> +                  const: antenna
> +            then:
> +              properties:
> +                groups:
> +                  enum: [i2s]

I have doubts such setup is maintainable and readable. I would suggest
to leave just few - maybe for gpio, jtag, refclk, utif.


Best regards,
Krzysztof