linux-kernel - Re: [PATCH v4 03/14] dt-bindings: i2c: add bindings for microchip mpfs i2c

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Date:   Thu, 20 Jan 2022 09:30:07 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Conor Dooley <conor.dooley@...rochip.com>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Rob Herring <robh+dt@...nel.org>,
        Jassi Brar <jassisinghbrar@...il.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Alessandro Zummo <a.zummo@...ertech.it>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Mark Brown <broonie@...nel.org>,
        Greg KH <gregkh@...uxfoundation.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>, Lee Jones <lee.jones@...aro.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux I2C <linux-i2c@...r.kernel.org>,
        Linux PWM List <linux-pwm@...r.kernel.org>,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        Linux Crypto Mailing List <linux-crypto@...r.kernel.org>,
        linux-rtc@...r.kernel.org, linux-spi <linux-spi@...r.kernel.org>,
        USB list <linux-usb@...r.kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        Bin Meng <bin.meng@...driver.com>,
        Heiko Stuebner <heiko@...ech.de>,
        Lewis Hanly <lewis.hanly@...rochip.com>,
        daire.mcnamara@...rochip.com, ivan.griffin@...rochip.com,
        Atish Patra <atishp@...osinc.com>
Subject: Re: [PATCH v4 03/14] dt-bindings: i2c: add bindings for microchip
 mpfs i2c

Hi Conor,

On Mon, Jan 17, 2022 at 12:06 PM <conor.dooley@...rochip.com> wrote:
> From: Conor Dooley <conor.dooley@...rochip.com>
>
> Add device tree bindings for the i2c controller on
> the Microchip PolarFire SoC.
>
> Signed-off-by: Daire McNamara <daire.mcnamara@...rochip.com>
> Signed-off-by: Conor Dooley <conor.dooley@...rochip.com>

Thanks for your patch!

> --- /dev/null
> +++ b/Documentation/devicetree/bindings/i2c/microchip,mpfs-i2c.yaml
> @@ -0,0 +1,55 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/i2c/microchip,mpfs-i2c.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Microchip MPFS I2C Controller Device Tree Bindings
> +
> +maintainers:
> +  - Daire McNamara <daire.mcnamara@...rochip.com>
> +
> +allOf:
> +  - $ref: /schemas/i2c/i2c-controller.yaml#
> +
> +properties:
> +  compatible:
> +    enum:
> +      - microchip,mpfs-i2c # Microchip PolarFire SoC compatible SoCs
> +      - microchip,corei2c-rtl-v7 # Microchip Fabric based i2c IP core

Wouldn't it be more logical to have:

    items:
      - const: microchip,mpfs-i2c # Microchip PolarFire SoC compatible SoCs
      - const: microchip,corei2c-rtl-v7 # Microchip Fabric based i2c IP core

?

If the IP core is reused, it can become:

    items:
      - enum:
          - microchip,mpfs-i2c # Microchip PolarFire SoC compatible SoCs
          - microchip,<foo>-i2c # ...
      - const: microchip,corei2c-rtl-v7 # Microchip Fabric based i2c IP core

That way the driver can just match on the second (fallback) value,
and no further driver changes will be needed (until v8 or later).

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds