linux-kernel - Re: [PATCH v2 1/2] dt-bindings: mmc: sdhci-atmel: Convert to json schema

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Message-ID: <20240830-satisfy-dislike-27ed075138b3@spud>
Date: Fri, 30 Aug 2024 14:48:23 +0100
From: Conor Dooley <conor@...nel.org>
To: Dharma Balasubiramani <dharma.b@...rochip.com>
Cc: Ulf Hansson <ulf.hansson@...aro.org>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Nicolas Ferre <nicolas.ferre@...rochip.com>,
	Alexandre Belloni <alexandre.belloni@...tlin.com>,
	Claudiu Beznea <claudiu.beznea@...on.dev>,
	Aubin Constans <aubin.constans@...rochip.com>,
	linux-mmc@...r.kernel.org, devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/2] dt-bindings: mmc: sdhci-atmel: Convert to json
 schema

On Fri, Aug 30, 2024 at 01:49:42PM +0530, Dharma Balasubiramani wrote:
> Convert sdhci-atmel documentation to yaml format. The new file will inherit
> from sdhci-common.yaml.
> 
> Note: Add microchip,sama7g5-sdhci to compatible list as we already use it
> in the DT.
> 
> Signed-off-by: Dharma Balasubiramani <dharma.b@...rochip.com>
> ---
>  .../bindings/mmc/atmel,sama5d2-sdhci.yaml          | 98 ++++++++++++++++++++++
>  .../devicetree/bindings/mmc/sdhci-atmel.txt        | 35 --------
>  2 files changed, 98 insertions(+), 35 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/mmc/atmel,sama5d2-sdhci.yaml b/Documentation/devicetree/bindings/mmc/atmel,sama5d2-sdhci.yaml
> new file mode 100644
> index 000000000000..91d18b2545e1
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mmc/atmel,sama5d2-sdhci.yaml
> @@ -0,0 +1,98 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/mmc/atmel,sama5d2-sdhci.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Atmel SDHCI controller
> +
> +maintainers:
> +  - Aubin Constans <aubin.constans@...rochip.com>
> +  - Nicolas Ferre <nicolas.ferre@...rochip.com>
> +
> +description:
> +  Bindings for the SDHCI controller found in Atmel/Microchip SoCs.
> +
> +properties:
> +  compatible:
> +    oneOf:
> +      - enum:
> +          - atmel,sama5d2-sdhci
> +          - atmel,sama5d3-sdhci
> +          - atmel,sama5d4-sdhci
> +          - microchip,sam9x60-sdhci
> +      - items:
> +          - enum:
> +              - microchip,sama7g5-sdhci
> +          - const: microchip,sam9x60-sdhci
> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  clocks:
> +    minItems: 2
> +    maxItems: 3
> +    description: |
> +      The sama5d2 family includes three clocks: `hclock`, `multclk`, and `baseclk`.
> +      For other families, including sam9x60 and sam9x7, only `hclock` and `multclk` are used.

This should instead be an items list, rather than a text based
description.

> +
> +  clock-names:
> +    minItems: 2
> +    maxItems: 3

We prefer that you describe the entries at this level, and constrain
them in the conditional bits below. IOW, move the items list here,
and only use minItems/maxItems below.

> +
> +  microchip,sdcal-inverted:
> +    type: boolean
> +    description:
> +      When present, polarity on the SDCAL SoC pin is inverted.
> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +  - clocks
> +  - clock-names
> +
> +allOf:
> +  - $ref: sdhci-common.yaml#
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            enum:
> +              - atmel,sama5d2-sdhci
> +    then:
> +      properties:
> +        clocks:
> +          maxItems: 3

maxItems: 3 or minItems: 3? Your answer will depend on whether or not
baseclk is optional on sama5d2.

Cheers,
Conor.

> +        clock-names:
> +          items:
> +            - const: hclock
> +            - const: multclk
> +            - const: baseclk
> +    else:
> +      properties:
> +        clocks:
> +          maxItems: 2
> +        clock-names:
> +          items:
> +            - const: hclock
> +            - const: multclk
> +
> +unevaluatedProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/interrupt-controller/irq.h>
> +    #include <dt-bindings/clock/at91.h>
> +    mmc@...00000 {
> +        compatible = "atmel,sama5d2-sdhci";
> +        reg = <0xa0000000 0x300>;
> +        interrupts = <31 IRQ_TYPE_LEVEL_HIGH 0>;
> +        clocks = <&sdmmc0_hclk>, <&sdmmc0_gclk>, <&main>;
> +        clock-names = "hclock", "multclk", "baseclk";
> +        assigned-clocks = <&sdmmc0_gclk>;
> +        assigned-clock-rates = <480000000>;
> +    };

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