linux-kernel - Re: [PATCH v2 1/2] dt-bindings: phy: mediatek: Add YAML schema for PCIe PHY

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Date:   Fri, 18 Mar 2022 12:12:01 +0100
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     Jianjun Wang <jianjun.wang@...iatek.com>,
        Chunfeng Yun <chunfeng.yun@...iatek.com>,
        Kishon Vijay Abraham I <kishon@...com>,
        Vinod Koul <vkoul@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Chen-Yu Tsai <wenst@...omium.org>
Cc:     linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-phy@...ts.infradead.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        rex-bc.chen@...iatek.com, randy.wu@...iatek.com,
        jieyy.yang@...iatek.com, chuanjia.liu@...iatek.com,
        qizhong.cheng@...iatek.com, jian.yang@...iatek.com
Subject: Re: [PATCH v2 1/2] dt-bindings: phy: mediatek: Add YAML schema for
 PCIe PHY

Il 18/03/22 10:54, Jianjun Wang ha scritto:
> Add YAML schema documentation for PCIe PHY on MediaTek chipsets.
> 
> Signed-off-by: Jianjun Wang <jianjun.wang@...iatek.com>
> ---
>   .../bindings/phy/mediatek,pcie-phy.yaml       | 75 +++++++++++++++++++
>   1 file changed, 75 insertions(+)
>   create mode 100644 Documentation/devicetree/bindings/phy/mediatek,pcie-phy.yaml
> 
> diff --git a/Documentation/devicetree/bindings/phy/mediatek,pcie-phy.yaml b/Documentation/devicetree/bindings/phy/mediatek,pcie-phy.yaml
> new file mode 100644
> index 000000000000..868bf976568b
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/phy/mediatek,pcie-phy.yaml
> @@ -0,0 +1,75 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/phy/mediatek,pcie-phy.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: MediaTek PCIe PHY
> +
> +maintainers:
> +  - Jianjun Wang <jianjun.wang@...iatek.com>
> +
> +description: |
> +  The PCIe PHY supports physical layer functionality for PCIe Gen3 port.
> +
> +properties:
> +  compatible:
> +    const: mediatek,mt8195-pcie-phy

Since I don't expect this driver to be only for MT8195, but to be extended to
support some more future MediaTek SoCs and, depending on the number of differences
in the possible future Gen4 PHYs, even different gen's, I propose to add a generic
compatible as const.

So you'll have something like:

- enum:
     - mediatek,mt8195-pcie-phy
- const: mediatek,pcie-gen3-phy

> +
> +  reg:
> +    maxItems: 1
> +

..snip..

> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    phy@...80000 {
> +        compatible = "mediatek,mt8195-pcie-phy";

... which would reflect here as

compatible = "mediatek,mt8195-pcie-phy", "mediatek,pcie-gen3-phy"

> +        #phy-cells = <0>;
> +        reg = <0x11e80000 0x10000>;
> +        reg-names = "sif";
> +        nvmem-cells = <&pciephy_glb_intr>,
> +                      <&pciephy_tx_ln0_pmos>,
> +                      <&pciephy_tx_ln0_nmos>,
> +                      <&pciephy_rx_ln0>,
> +                      <&pciephy_tx_ln1_pmos>,
> +                      <&pciephy_tx_ln1_nmos>,
> +                      <&pciephy_rx_ln1>;
> +        nvmem-cell-names = "glb_intr", "tx_ln0_pmos",
> +                           "tx_ln0_nmos", "rx_ln0",
> +                           "tx_ln1_pmos", "tx_ln1_nmos",
> +                           "rx_ln1";
> +        power-domains = <&spm 2>;
> +    };


Regards,
Angelo