linux-kernel - Re: [PATCH v5 2/8] dt-bindings: phy: Add imx8 pcie phy driver support

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Message-ID: <YYFqCptm9m7Onbrv@robh.at.kernel.org>
Date:   Tue, 2 Nov 2021 11:40:42 -0500
From:   Rob Herring <robh@...nel.org>
To:     Richard Zhu <hongxing.zhu@....com>
Cc:     l.stach@...gutronix.de, marcel.ziswiler@...adex.com,
        tharvey@...eworks.com, kishon@...com, vkoul@...nel.org,
        galak@...nel.crashing.org, shawnguo@...nel.org,
        linux-phy@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kernel@...gutronix.de, linux-imx@....com
Subject: Re: [PATCH v5 2/8] dt-bindings: phy: Add imx8 pcie phy driver support

On Tue, Nov 02, 2021 at 10:32:29AM +0800, Richard Zhu wrote:
> Add dt-binding for the standalone i.MX8 PCIe PHY driver.
> 
> Signed-off-by: Richard Zhu <hongxing.zhu@....com>
> Tested-by: Marcel Ziswiler <marcel.ziswiler@...adex.com>
> Reviewed-by: Tim Harvey <tharvey@...eworks.com>
> Tested-by: Tim Harvey <tharvey@...eworks.com>
> ---
>  .../bindings/phy/fsl,imx8-pcie-phy.yaml       | 95 +++++++++++++++++++
>  1 file changed, 95 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/phy/fsl,imx8-pcie-phy.yaml
> 
> diff --git a/Documentation/devicetree/bindings/phy/fsl,imx8-pcie-phy.yaml b/Documentation/devicetree/bindings/phy/fsl,imx8-pcie-phy.yaml
> new file mode 100644
> index 000000000000..b9f89e343b0b
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/phy/fsl,imx8-pcie-phy.yaml
> @@ -0,0 +1,95 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/phy/fsl,imx8-pcie-phy.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Freescale i.MX8 SoC series PCIe PHY Device Tree Bindings
> +
> +maintainers:
> +  - Richard Zhu <hongxing.zhu@....com>
> +
> +properties:
> +  "#phy-cells":
> +    const: 0
> +
> +  compatible:
> +    enum:
> +      - fsl,imx8mm-pcie-phy
> +
> +  reg:
> +    maxItems: 1
> +
> +  clocks:
> +    items:
> +      - description: PHY module clock

The description doesn't really add much. Just 'maxItems: 1'.

> +
> +  clock-names:
> +    items:
> +      - const: ref
> +
> +  resets:
> +    items:
> +      - description: Phandles to PCIe-related reset lines exposed by SRC
> +          IP block.

More than 1 phandle? The schema says only 1. Again, for only 1, you can 
use just 'maxItems: 1'.

> +
> +  reset-names:
> +    items:
> +      - const: pciephy
> +
> +  fsl,refclk-pad-mode:
> +    description: |
> +      Specifies the mode of the refclk pad used. It can be UNUSED(PHY
> +      refclock is derived from SoC internal source), INPUT(PHY refclock
> +      is provided externally via the refclk pad) or OUTPUT(PHY refclock
> +      is derived from SoC internal source and provided on the refclk pad).
> +      Refer include/dt-bindings/phy/phy-imx8-pcie.h for the constants
> +      to be used.
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    enum: [ 0, 1, 2 ]
> +
> +  fsl,tx-deemph-gen1:
> +    description: Gen1 De-emphasis value (optional required).

Optional or required?

> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    default: 0
> +
> +  fsl,tx-deemph-gen2:
> +    description: Gen2 De-emphasis value (optional required).
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    default: 0
> +
> +  fsl,clkreq-unsupported:
> +    type: boolean
> +    description: A boolean property indicating the CLKREQ# signal is
> +      not supported in the board design (optional)
> +
> +required:
> +  - "#phy-cells"
> +  - compatible
> +  - reg
> +  - clocks
> +  - clock-names
> +  - fsl,refclk-pad-mode
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/clock/imx8mm-clock.h>
> +    #include <dt-bindings/phy/phy-imx8-pcie.h>
> +    #include <dt-bindings/reset/imx8mq-reset.h>
> +
> +    pcie_phy: pcie-phy@...00000 {
> +            compatible = "fsl,imx8mm-pcie-phy";
> +            reg = <0x32f00000 0x10000>;
> +            clocks = <&clk IMX8MM_CLK_PCIE1_PHY>;
> +            clock-names = "ref";
> +            assigned-clocks = <&clk IMX8MM_CLK_PCIE1_PHY>;
> +            assigned-clock-rates = <100000000>;
> +            assigned-clock-parents = <&clk IMX8MM_SYS_PLL2_100M>;
> +            resets = <&src IMX8MQ_RESET_PCIEPHY>;
> +            reset-names = "pciephy";
> +            fsl,refclk-pad-mode = <IMX8_PCIE_REFCLK_PAD_INPUT>;
> +            #phy-cells = <0>;
> +    };
> +...
> -- 
> 2.25.1
> 
>