linux-kernel - Re: [RFC/RFT v2 01/11] dt-bindings: phy: rockchip: add PCIe v3 phy

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Message-ID: <f002b635-75c5-b7ba-72c4-70f0e20369e7@linaro.org>
Date:   Thu, 28 Apr 2022 08:33:05 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Frank Wunderlich <linux@...web.de>,
        linux-rockchip@...ts.infradead.org
Cc:     Frank Wunderlich <frank-w@...lic-files.de>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Heiko Stuebner <heiko@...ech.de>,
        Kishon Vijay Abraham I <kishon@...com>,
        Vinod Koul <vkoul@...nel.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Johan Jonker <jbx6244@...il.com>,
        Peter Geis <pgwipeout@...il.com>,
        Michael Riesch <michael.riesch@...fvision.net>,
        linux-pci@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-phy@...ts.infradead.org
Subject: Re: [RFC/RFT v2 01/11] dt-bindings: phy: rockchip: add PCIe v3 phy

On 26/04/2022 15:21, Frank Wunderlich wrote:
> From: Frank Wunderlich <frank-w@...lic-files.de>
> 
> Add a new binding file for Rockchip PCIe v3 phy driver.
> 
> Signed-off-by: Frank Wunderlich <frank-w@...lic-files.de>
> 
> ---
> v2:
> dt-bindings: rename yaml for PCIe v3
> rockchip-pcie3-phy.yaml => rockchip,pcie3-phy.yaml
> 
> changes in pcie3 phy yaml
> - change clock names to ordered const list
> - extend pcie30-phymode description
> - add phy-cells to required properties
> - drop unevaluatedProperties
> - example with 1 clock each line
> - use default property instead of text describing it
> - update license
> ---
>  .../bindings/phy/rockchip,pcie3-phy.yaml      | 84 +++++++++++++++++++
>  1 file changed, 84 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/phy/rockchip,pcie3-phy.yaml
> 
> diff --git a/Documentation/devicetree/bindings/phy/rockchip,pcie3-phy.yaml b/Documentation/devicetree/bindings/phy/rockchip,pcie3-phy.yaml
> new file mode 100644
> index 000000000000..3592888b5ee2
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/phy/rockchip,pcie3-phy.yaml
> @@ -0,0 +1,84 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/phy/rockchip,pcie3-phy.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Rockchip PCIe v3 phy
> +
> +maintainers:
> +  - Heiko Stuebner <heiko@...ech.de>
> +
> +properties:
> +  compatible:
> +    enum:
> +      - rockchip,rk3568-pcie3-phy
> +      - rockchip,rk3588-pcie3-phy
> +
> +  reg:
> +    maxItems: 1
> +
> +  clocks:
> +    minItems: 1
> +    maxItems: 3
> +
> +  clock-names:
> +    items:
> +      - const: "refclk_m"
> +      - const: "refclk_n"
> +      - const: "pclk"

Drop quotes.

> +
> +    minItems: 1

I think we agreed to skip rk3588 or make the number of clocks strict?

> +
> +  "#phy-cells":
> +    const: 0
> +
> +  resets:
> +    maxItems: 1
> +
> +  reset-names:
> +    const: phy
> +
> +  rockchip,phy-grf:
> +    $ref: /schemas/types.yaml#/definitions/phandle
> +    description: phandle to the syscon managing the phy "general register files"
> +
> +  rockchip,pipe-grf:
> +    $ref: /schemas/types.yaml#/definitions/phandle
> +    description: phandle to the syscon managing the pipe "general register files"
> +
> +  rockchip,pcie30-phymode:
> +    $ref: '/schemas/types.yaml#/definitions/uint32'

No need for quotes. You don't use it in other places.

> +    description: |
> +      set the phy-mode for enabling bifurcation
> +      bit0: bifurcation for port 0
> +      bit1: bifurcation for port 1
> +      bit2: aggregation
> +      constants are defined in the dt-bindings/phy/phy-rockchip-pcie3.h

Full path. It should also follow vendor,device naming convention.

> +    minimum: 0x0
> +    maximum: 0x4
> +    default: 0x4
> +
> +required:
> +  - compatible
> +  - reg
> +  - rockchip,phy-grf
> +  - "#phy-cells"
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/clock/rk3568-cru.h>
> +    pcie30phy: phy@...c0000 {
> +      compatible = "rockchip,rk3568-pcie3-phy";
> +      reg = <0x0 0xfe8c0000 0x0 0x20000>;
> +      #phy-cells = <0>;
> +      clocks = <&pmucru CLK_PCIE30PHY_REF_M>,
> +               <&pmucru CLK_PCIE30PHY_REF_N>,
> +               <&cru PCLK_PCIE30PHY>;
> +      clock-names = "refclk_m", "refclk_n", "pclk";
> +      resets = <&cru SRST_PCIE30PHY>;
> +      reset-names = "phy";
> +      rockchip,phy-grf = <&pcie30_phy_grf>;
> +    };


Best regards,
Krzysztof