linux-kernel - Re: [PATCH v5 1/2] dt-bindings: phy: intel-emmc-phy: Add YAML schema for LGM eMMC PHY

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Date:   Tue, 17 Sep 2019 09:23:37 -0500
From:   Rob Herring <robh@...nel.org>
To:     "Ramuthevar,Vadivel MuruganX" 
        <vadivel.muruganx.ramuthevar@...ux.intel.com>
Cc:     kishon@...com, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, andriy.shevchenko@...el.com,
        cheol.yong.kim@...el.com, qi-ming.wu@...el.com,
        peter.harliman.liem@...el.com
Subject: Re: [PATCH v5 1/2] dt-bindings: phy: intel-emmc-phy: Add YAML schema
 for LGM eMMC PHY

On Wed, Sep 04, 2019 at 01:53:43PM +0800, Ramuthevar,Vadivel MuruganX wrote:
> From: Ramuthevar Vadivel Murugan <vadivel.muruganx.ramuthevar@...ux.intel.com>
> 
> Add a YAML schema to use the host controller driver with the
> eMMC PHY on Intel's Lightning Mountain SoC.
> 
> Signed-off-by: Ramuthevar Vadivel Murugan <vadivel.muruganx.ramuthevar@...ux.intel.com>
> ---
> changes in v5:
>   - earlier Review-by tag given by Rob
>   - rework done with syscon parent node.
> 
> changes in v4:
>   - As per Rob's review: validate 5.2 and 5.3
>   - drop unrelated items.
> 
> changes in v3:
>   - resolve 'make dt_binding_check' warnings
> 
> changes in v2:
>   As per Rob Herring review comments, the following updates
>  - change GPL-2.0 -> (GPL-2.0-only OR BSD-2-Clause)
>  - filename is the compatible string plus .yaml
>  - LGM: Lightning Mountain
>  - update maintainer
>  - add intel,syscon under property list
>  - keep one example instead of two
> ---
>  .../bindings/phy/intel,lgm-emmc-phy.yaml           | 69 ++++++++++++++++++++++
>  1 file changed, 69 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/phy/intel,lgm-emmc-phy.yaml
> 
> diff --git a/Documentation/devicetree/bindings/phy/intel,lgm-emmc-phy.yaml b/Documentation/devicetree/bindings/phy/intel,lgm-emmc-phy.yaml
> new file mode 100644
> index 000000000000..8f6ac8b3da42
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/phy/intel,lgm-emmc-phy.yaml
> @@ -0,0 +1,69 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/phy/intel,lgm-emmc-phy.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Intel Lightning Mountain(LGM) eMMC PHY Device Tree Bindings
> +
> +maintainers:
> +  - Ramuthevar Vadivel Murugan <vadivel.muruganx.ramuthevar@...ux.intel.com>
> +
> +description: Bindings for eMMC PHY on Intel's Lightning Mountain SoC, syscon
> +  node is used to reference the base address of eMMC phy registers.
> +
> +select:
> +  properties:
> +    compatible:
> +      contains:
> +        const: intel,lgm-syscon

This, plus...

> +
> +    reg:
> +      maxItems: 1
> +
> +  required:
> +    - compatible
> +    - reg
> +
> +properties:
> +  "#phy-cells":
> +    const: 0
> +
> +  compatible:
> +    contains:
> +      const: intel,lgm-emmc-phy

...this should not pass validation as they contradict each other.

> +
> +  reg:
> +    maxItems: 1
> +
> +  clocks:
> +    maxItems: 1
> +
> +  clock-names:
> +    maxItems: 1
> +
> +required:
> +  - "#phy-cells"
> +  - compatible
> +  - reg
> +  - clocks
> +  - clock-names
> +
> +examples:
> +  - |
> +    sysconf: chiptop@...00000 {
> +      compatible = "intel,lgm-syscon";
> +      reg = <0xe0200000 0x100>;

I'm still waiting for a complete description of what all is in this 
block.

> +
> +      emmc-phy: emmc-phy {
> +        compatible = "intel,lgm-emmc-phy";
> +        reg = <0x00a8 0x4>,
> +              <0x00ac 0x4>,
> +              <0x00b0 0x4>,
> +              <0x00b4 0x4>;

Looks contiguous and can be a single entry:

<0xa8 0x10>

> +        clocks = <&emmc>;
> +        clock-names = "emmcclk";
> +        #phy-cells = <0>;
> +      };
> +    };
> +...
> -- 
> 2.11.0
>