linux-kernel - Re: [PATCH v3 1/4] dt-bindings: mmc: Convert mtk-sd to json-schema

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Date:   Mon, 5 Oct 2020 14:41:08 +0200
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Wenbin Mei <wenbin.mei@...iatek.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Chaotian Jing <chaotian.jing@...iatek.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        DTML <devicetree@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        srv_heupstream <srv_heupstream@...iatek.com>
Subject: Re: [PATCH v3 1/4] dt-bindings: mmc: Convert mtk-sd to json-schema

[...]

> diff --git a/Documentation/devicetree/bindings/mmc/mtk-sd.yaml b/Documentation/devicetree/bindings/mmc/mtk-sd.yaml
> new file mode 100644
> index 000000000000..7f89cbdc52a5
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mmc/mtk-sd.yaml
> @@ -0,0 +1,168 @@
> +# SPDX-License-Identifier: GPL-2.0
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/mmc/mtk-sd.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: MTK MSDC Storage Host Controller Binding
> +
> +maintainers:
> +  - Chaotian Jing <chaotian.jing@...iatek.com>
> +  - Wenbin Mei <wenbin.mei@...iatek.com>
> +
> +allOf:
> +  - $ref: mmc-controller.yaml#
> +
> +properties:
> +  compatible:
> +    oneOf:
> +      - enum:
> +        - mediatek,mt2701-mmc
> +        - mediatek,mt2712-mmc
> +        - mediatek,mt6779-mmc
> +        - mediatek,mt7620-mmc
> +        - mediatek,mt7622-mmc
> +        - mediatek,mt8135-mmc
> +        - mediatek,mt8173-mmc
> +        - mediatek,mt8183-mmc
> +        - mediatek,mt8516-mmc
> +      - items:
> +        - const: mediatek,mt7623-mmc
> +        - const: mediatek,mt2701-mmc
> +
> +  clocks:
> +    description:
> +      Should contain phandle for the clock feeding the MMC controller.
> +    minItems: 2
> +    maxItems: 4
> +    items:
> +      - description: source clock (required).
> +      - description: HCLK which used for host (required).
> +      - description: independent source clock gate (required for MT2712).
> +      - description: bus clock used for internal register access (required for MT2712 MSDC0/3).
> +
> +  clock-names:
> +    minItems: 2
> +    maxItems: 4
> +    items:
> +      - const: source
> +      - const: hclk
> +      - const: source_cg
> +      - const: bus_clk
> +
> +  pinctrl-names:
> +    items:
> +      - const: default
> +      - const: state_uhs
> +
> +  pinctrl-0:
> +    description:
> +      should contain default/high speed pin ctrl.
> +    maxItems: 1
> +
> +  pinctrl-1:
> +    description:
> +      should contain uhs mode pin ctrl.
> +    maxItems: 1
> +
> +  vmmc-supply:
> +    description:
> +      power to the Core.
> +    maxItems: 1
> +
> +  vqmmc-supply:
> +    description:
> +      power to the IO.
> +    maxItems: 1

The vmmc and vqmmc are described in the mmc-controller.yaml, so
shouldn't be needed here.

> +
> +  assigned-clocks:
> +    description:
> +      PLL of the source clock.
> +    maxItems: 1
> +
> +  assigned-clock-parents:
> +    description:
> +      parent of source clock, used for HS400 mode to get 400Mhz source clock.
> +    maxItems: 1
> +
> +  hs400-ds-delay:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description:
> +      HS400 DS delay setting.
> +    minimum: 0
> +    maximum: 0xffffffff
> +
> +  mediatek,hs200-cmd-int-delay:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description:
> +      HS200 command internal delay setting.
> +      This field has total 32 stages.
> +      The value is an integer from 0 to 31.
> +    minimum: 0
> +    maximum: 31
> +
> +  mediatek,hs400-cmd-int-delay:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description:
> +      HS400 command internal delay setting.
> +      This field has total 32 stages.
> +      The value is an integer from 0 to 31.
> +    minimum: 0
> +    maximum: 31
> +
> +  mediatek,hs400-cmd-resp-sel-rising:
> +    $ref: /schemas/types.yaml#/definitions/flag
> +    description:
> +      HS400 command response sample selection.
> +      If present, HS400 command responses are sampled on rising edges.
> +      If not present, HS400 command responses are sampled on falling edges.
> +
> +  mediatek,latch-ck:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description:
> +      Some SoCs do not support enhance_rx, need set correct latch-ck to avoid
> +      data crc error caused by stop clock(fifo full) Valid range = [0:0x7].
> +      if not present, default value is 0.
> +      applied to compatible "mediatek,mt2701-mmc".
> +    minimum: 0
> +    maximum: 7
> +
> +  resets:
> +    maxItems: 1
> +
> +  reset-names:
> +    const: hrst
> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +  - clocks
> +  - clock-names

According to the current bindings, the vmmc/vqmmc supplies and the
pinctrls are required as well. I assume you should add them here too!?

[...]

Kind regards
Uffe