linux-kernel - Re: [PATCH V2 3/6] dt-bindings: clk: sprd: add bindings for sc9863a clock controller

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Date:   Thu, 26 Dec 2019 11:56:23 -0700
From:   Rob Herring <robh@...nel.org>
To:     Chunyan Zhang <zhang.lyra@...il.com>
Cc:     Stephen Boyd <sboyd@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Mark Rutland <mark.rutland@....com>, linux-clk@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Orson Zhai <orsonzhai@...il.com>,
        Baolin Wang <baolin.wang7@...il.com>,
        Chunyan Zhang <chunyan.zhang@...soc.com>
Subject: Re: [PATCH V2 3/6] dt-bindings: clk: sprd: add bindings for sc9863a
 clock controller

On Mon, Dec 16, 2019 at 08:19:29PM +0800, Chunyan Zhang wrote:
> From: Chunyan Zhang <chunyan.zhang@...soc.com>
> 
> add a new bindings to describe sc9863a clock compatible string.
> 
> Signed-off-by: Chunyan Zhang <chunyan.zhang@...soc.com>
> ---
>  .../bindings/clock/sprd,sc9863a-clk.yaml      | 77 +++++++++++++++++++
>  1 file changed, 77 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/clock/sprd,sc9863a-clk.yaml
> 
> diff --git a/Documentation/devicetree/bindings/clock/sprd,sc9863a-clk.yaml b/Documentation/devicetree/bindings/clock/sprd,sc9863a-clk.yaml
> new file mode 100644
> index 000000000000..881f0a0287e5
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/clock/sprd,sc9863a-clk.yaml
> @@ -0,0 +1,77 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +# Copyright 2019 Unisoc Inc.
> +%YAML 1.2
> +---
> +$id: "http://devicetree.org/schemas/clock/sprd,sc9863a-clk.yaml#"
> +$schema: "http://devicetree.org/meta-schemas/core.yaml#"
> +
> +title: SC9863A Clock Control Unit Device Tree Bindings
> +
> +maintainers:
> +  - Orson Zhai <orsonzhai@...il.com>
> +  - Baolin Wang <baolin.wang7@...il.com>
> +  - Chunyan Zhang <zhang.lyra@...il.com>
> +
> +properties:
> +  "#clock-cells":
> +    const: 1
> +
> +  compatible :
> +    enum:
> +      - sprd,sc9863a-ap-clk
> +      - sprd,sc9863a-pmu-gate
> +      - sprd,sc9863a-pll
> +      - sprd,sc9863a-mpll
> +      - sprd,sc9863a-rpll
> +      - sprd,sc9863a-dpll
> +      - sprd,sc9863a-aon-clk
> +      - sprd,sc9863a-apahb-gate
> +      - sprd,sc9863a-aonapb-gate
> +      - sprd,sc9863a-mm-gate
> +      - sprd,sc9863a-mm-clk
> +      - sprd,sc9863a-vspahb-gate
> +      - sprd,sc9863a-apapb-gate

These will probably need to be split to separate schemas for the reasons 
below...

> +
> +  clocks:
> +    description: |
> +      The input parent clock(s) phandle for this clock, only list fixed
> +      clocks which are decleared in devicetree.

typo.

You need to define how many clocks.

> +
> +  clock-names:
> +    description: |
> +      Clock name strings used for driver to reference.

You need to list out the names.

> +
> +  reg:
> +    description: |
> +      Contain the registers base address and length. It must be configured
> +      only if no 'sprd,syscon' under the node.
> +
> +  sprd,syscon:
> +    $ref: '/schemas/types.yaml#/definitions/phandle'
> +    description: |
> +      The phandle to the syscon which is in the same address area with
> +      the clock, and so we can get regmap for the clocks from the
> +      syscon device.

It is preferred to make the clock node a child of the syscon and then 
you don't need this property.

> +
> +required:
> +  - compatible
> +  - '#clock-cells'
> +
> +examples:
> +  - |
> +    ap_clk: clock-controller@...00000 {
> +      compatible = "sprd,sc9863a-ap-clk";
> +      reg = <0 0x21500000 0 0x1000>;
> +      clocks = <&ext_32k>, <&ext_26m>;
> +      clock-names = "ext-32k", "ext-26m";
> +      #clock-cells = <1>;
> +    };
> +
> +  - |
> +    apahb_gate: apahb-gate {
> +      compatible = "sprd,sc9863a-apahb-gate";
> +      sprd,syscon = <&ap_ahb_regs>;
> +      #clock-cells = <1>;
> +    };
> +
> +...
> -- 
> 2.20.1
>