linux-kernel - Re: [PATCH 1/6] dt-bindings: phy: Add PCIe PHY bindings for FSD

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Date:   Mon, 21 Nov 2022 12:59:57 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Shradha Todi <shradha.t@...sung.com>, bhelgaas@...gle.com,
        robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        kishon@...com, vkoul@...nel.org, lpieralisi@...nel.org,
        kw@...ux.com, mani@...nel.org, arnd@...db.de,
        gregkh@...uxfoundation.org, alim.akhtar@...sung.com,
        ajaykumar.rs@...sung.com, rcsekar@...sung.com,
        sriranjani.p@...sung.com, bharat.uppal@...sung.com,
        s.prashar@...sung.com, aswani.reddy@...sung.com,
        pankaj.dubey@...sung.com, p.rajanbabu@...sung.com,
        niyas.ahmed@...sung.com, chanho61.park@...sung.com
Cc:     linux-pci@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-phy@...ts.infradead.org
Subject: Re: [PATCH 1/6] dt-bindings: phy: Add PCIe PHY bindings for FSD

On 21/11/2022 11:52, Shradha Todi wrote:
> Document the PCIe PHY device tree bindings for Tesla
> FSD SoC

Subject: drop second, redundant "bindings".

> 
> Signed-off-by: Shradha Todi <shradha.t@...sung.com>
> ---
>  .../bindings/phy/phy-tesla-pcie.yaml          | 75 +++++++++++++++++++
>  1 file changed, 75 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/phy/phy-tesla-pcie.yaml
> 
> diff --git a/Documentation/devicetree/bindings/phy/phy-tesla-pcie.yaml b/Documentation/devicetree/bindings/phy/phy-tesla-pcie.yaml
> new file mode 100644
> index 000000000000..8fa9a050af7a
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/phy/phy-tesla-pcie.yaml

Filename based on compatible.

> @@ -0,0 +1,75 @@
> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/phy/phy-tesla-pcie.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Tesla FSD SoC PCIe PHY
> +
> +maintainers:
> +  - Shradha Todi <shradha.t@...sung.com>
> +
> +properties:
> +  "#phy-cells":
> +    const: 0

Put compatible as first.

> +
> +  compatible:
> +    enum:
> +      - tesla,fsd-pcie-phy
> +
> +  reg:
> +    minItems: 2

Drop minItems

> +    maxItems: 2
> +
> +  reg-names:
> +    minItems: 2
> +    maxItems: 2

Drop both.

> +    items:
> +      enum: [phy, pcs]

Instead list items one after another.

> +    description: |
> +      phy is the register access to PMA layer
> +      pcs is the register access to PCS layer

These go to describing items in 'reg:'

> +
> +  phy-mode:
> +    description: |
> +      Defines the bifurcation mode of the PHY

enum, probably type as well... phy-mode is usually a string. Is it here?

> +
> +  tesla,pmureg-phandle:

Drop phandle, so tesla,pmu-syscon

> +    $ref: '/schemas/types.yaml#/definitions/phandle'

Drop quotes

> +    description: phandle for PMU system controller interface used to
> +                 control PMU register bits for PCIe PHY
> +
> +  tesla,pcie-sysreg:
> +    $ref: '/schemas/types.yaml#/definitions/phandle'

Drop quotes

> +    description: phandle for system control registers, used to
> +                 control phy signals at system level
> +
> +required:
> +  - "#phy-cells"
> +  - compatible

compatible first.

> +  - reg
> +  - reg-names
> +  - phy-mode
> +  - tesla,pmureg-phandle
> +  - tesla,pcie-sysreg
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    bus {
> +      #address-cells = <2>;
> +      #size-cells = <2>;
> +
> +      pcie_phy0: pcie-phy@...80000 {
> +        compatible = "tesla,fsd-pcie-phy";
> +        #phy-cells = <0>;
> +        reg = <0x0 0x15080000 0x0 0x2000>, <0x0 0x150A0000 0x0 0x1000>;
> +        reg-names = "phy", "pcs";
> +        tesla,pmureg-phandle = <&pmu_system_controller>;
> +        tesla,pcie-sysreg = <&sysreg_fsys0>;
> +        phy-mode = <0>;
> +        status = "disabled";

Drop status

> +      };
> +    };
> +...

Best regards,
Krzysztof