linux-kernel - Re: [PATCH 05/13] dt-bindings: i2c: add bindings for microchip mpfs i2c

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Message-ID: <632cb889-114b-2b44-3a75-e4b9e5bd0bda@canonical.com>
Date:   Mon, 8 Nov 2021 22:13:10 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
To:     conor.dooley@...rochip.com, linus.walleij@...aro.org,
        bgolaszewski@...libre.com, robh+dt@...nel.org,
        jassisinghbrar@...il.com, paul.walmsley@...ive.com,
        palmer@...belt.com, aou@...s.berkeley.edu, a.zummo@...ertech.it,
        alexandre.belloni@...tlin.com, broonie@...nel.org,
        gregkh@...uxfoundation.org, lewis.hanly@...rochip.com,
        daire.mcnamara@...rochip.com, atish.patra@....com,
        ivan.griffin@...rochip.com, linux-gpio@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-i2c@...r.kernel.org, linux-riscv@...ts.infradead.org,
        linux-crypto@...r.kernel.org, linux-rtc@...r.kernel.org,
        linux-spi@...r.kernel.org, linux-usb@...r.kernel.org
Cc:     geert@...ux-m68k.org, bin.meng@...driver.com
Subject: Re: [PATCH 05/13] dt-bindings: i2c: add bindings for microchip mpfs
 i2c

On 08/11/2021 16:05, 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: Conor Dooley <conor.dooley@...rochip.com>
> Signed-off-by: Daire McNamara <daire.mcnamara@...rochip.com>
> ---
>  .../bindings/i2c/microchip,mpfs-i2c.yaml      | 74 +++++++++++++++++++
>  1 file changed, 74 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/i2c/microchip,mpfs-i2c.yaml
> 
> diff --git a/Documentation/devicetree/bindings/i2c/microchip,mpfs-i2c.yaml b/Documentation/devicetree/bindings/i2c/microchip,mpfs-i2c.yaml
> new file mode 100644
> index 000000000000..bc4ea4498d35
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/i2c/microchip,mpfs-i2c.yaml
> @@ -0,0 +1,74 @@
> +# 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>
> +
> +description: |
> +  This I2C controller is found on the Microchip PolarFire SoC.
> +
> +allOf:
> +  - $ref: /schemas/i2c/i2c-controller.yaml#
> +
> +properties:
> +  compatible:
> +    enum:
> +      - microchip,mpfs-i2c # Microchip PolarFire SoC compatible SoCs
> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  clocks:
> +    description: Phandle of the clock feeding the I2C controller.

Skip such descriptions here and in other patches - they do not introduce
any meaningful information.

> +    minItems: 1

Define instead exact number of clocks or maxItems... but why would they
be variable?

> +
> +  clock-frequency:
> +    description: |
> +      Desired I2C bus clock frequency in Hz. As only Standard and Fast
> +      modes are supported, possible values are 100000 and 400000.
> +    enum: [100000, 400000]
> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +  - clocks
> +
> +unevaluatedProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/clock/microchip,mpfs-clock.h>
> +    soc {
> +        #address-cells = <2>;
> +        #size-cells = <2>;
> +        i2c@...0a000 {
> +            compatible = "microchip,mpfs-i2c";
> +            reg = <0 0x2010a000 0 0x1000>;
> +            interrupts = <58>;
> +            clock-frequency = <100000>;
> +            clocks = <&clkcfg CLK_I2C0>;
> +        };
> +    };
> +  - |
> +    #include <dt-bindings/clock/microchip,mpfs-clock.h>
> +    soc {
> +        #address-cells = <2>;
> +        #size-cells = <2>;
> +        i2c@...0b000 {
> +            compatible = "microchip,mpfs-i2c";
> +            reg = <0 0x2010b000 0 0x1000>;
> +            interrupts = <61>;
> +            clock-frequency = <100000>;
> +            clocks = <&clkcfg CLK_I2C1>;

This is the same example as above, just with changed numbers. Skip it.

> +        };
> +    };
> +...
> 


Best regards,
Krzysztof