linux-kernel - Re: [PATCH v2 1/3] dt-bindings: mmc: Add bindings for StarFive

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Message-ID: <fc5866ef-4eea-bc15-7cbe-d2e00c37e282@linaro.org>
Date:   Tue, 27 Dec 2022 14:05:03 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     William Qiu <william.qiu@...rfivetech.com>,
        linux-riscv@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-mmc@...r.kernel.org
Cc:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Jaehoon Chung <jh80.chung@...sung.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/3] dt-bindings: mmc: Add bindings for StarFive

On 27/12/2022 13:22, William Qiu wrote:
> Add documentation to describe StarFive
> designware mobile storage host controller driver.

Please wrap commit message according to Linux coding style / submission
process (neither too early nor over the limit):
https://elixir.bootlin.com/linux/v5.18-rc4/source/Documentation/process/submitting-patches.rst#L586

The subject is a bit redundant and not precise. No need to mention
"bindings" twice but "StarFive" is really too generic. Do you add now
all possible devices from StarFive? I see only one. Rephrase (use git
log to find examples).

> 
> Signed-off-by: William Qiu <william.qiu@...rfivetech.com>
> ---
>  .../bindings/mmc/starfive,jh7110-mmc.yaml     | 72 +++++++++++++++++++
>  1 file changed, 72 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/mmc/starfive,jh7110-mmc.yaml
> 
> diff --git a/Documentation/devicetree/bindings/mmc/starfive,jh7110-mmc.yaml b/Documentation/devicetree/bindings/mmc/starfive,jh7110-mmc.yaml
> new file mode 100644
> index 000000000000..430dd5f24933
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mmc/starfive,jh7110-mmc.yaml
> @@ -0,0 +1,72 @@
> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/mmc/starfive,jh7110-mmc.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: StarFive Designware Mobile Storage Host Controller
> +
> +description:
> +  StarFive uses the Synopsys designware mobile storage host controller
> +  to interface a SoC with storage medium such as eMMC or SD/MMC cards.
> +
> +allOf:
> +  - $ref: synopsys-dw-mshc-common.yaml#
> +
> +maintainers:
> +  - William Qiu <william.qiu@...rfivetech.com>
> +
> +properties:
> +  compatible:
> +    const: starfive,jh7110-mmc
> +
> +  reg:
> +    maxItems: 1
> +
> +  clocks:
> +    items:
> +      - description: biu clock
> +      - description: ciu clock
> +
> +  clock-names:
> +    items:
> +      - const: biu
> +      - const: ciu
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  starfive,syscon:

Name is not specific enough. What is syscon? Any syscon? This needs to
be specific.

> +    $ref: /schemas/types.yaml#/definitions/phandle-array
> +    description:
> +      arg0:arg0 is syscon.

What is syscon?

> +      arg1:arg1 is syscon register offset, used to enable MMC function.

Describe the argument, not what it is used for, e.g. "offset of XXX YYY ZZZ"

> +      arg2:arg2 is used to enable the register shift of the MMC function.
> +      arg3:arg3 is used to enable the register mask of the MMC function.

That's not how the phandle array is described. Instead:

https://elixir.bootlin.com/linux/v5.18-rc1/source/Documentation/devicetree/bindings/soc/samsung/exynos-usi.yaml#L42



Best regards,
Krzysztof