linux-kernel - Re: [PATCH v5 3/7] dt-bindings: clk: sprd: add bindings for sc9863a clock controller

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Date:   Wed, 26 Feb 2020 09:26:42 -0600
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 v5 3/7] dt-bindings: clk: sprd: add bindings for sc9863a
 clock controller

On Wed, Feb 19, 2020 at 12:09:11PM +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      | 110 ++++++++++++++++++
>  1 file changed, 110 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..b31569b524e5
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/clock/sprd,sc9863a-clk.yaml
> @@ -0,0 +1,110 @@
> +# 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-aon-clk
> +      - sprd,sc9863a-apahb-gate
> +      - sprd,sc9863a-pmu-gate
> +      - sprd,sc9863a-aonapb-gate
> +      - sprd,sc9863a-pll
> +      - sprd,sc9863a-mpll
> +      - sprd,sc9863a-rpll
> +      - sprd,sc9863a-dpll
> +      - sprd,sc9863a-mm-gate
> +      - sprd,sc9863a-apapb-gate
> +
> +  clocks:
> +    minItems: 1
> +    maxItems: 4
> +    description: |
> +      The input parent clock(s) phandle for this clock, only list fixed
> +      clocks which are declared in devicetree.
> +
> +  clock-names:
> +    minItems: 1
> +    maxItems: 4
> +    description: |
> +      Clock name strings used for driver to reference.

Drop this. That's all 'clock-names'.

> +    items:
> +      - const: ext-26m
> +      - const: ext-32k
> +      - const: ext-4m
> +      - const: rco-100m
> +
> +  reg:
> +    description: |
> +      Contain the registers base address and length.

Drop this. You need to define how many entries (maxItems: 1).

> +
> +required:
> +  - compatible
> +  - '#clock-cells'
> +
> +if:
> +  properties:
> +    compatible:
> +      enum:
> +        - sprd,sc9863a-ap-clk
> +        - sprd,sc9863a-aon-clk
> +then:
> +  required:
> +    - reg
> +
> +else:
> +  description: |
> +    Other SC9863a clock nodes should be the child of a syscon node with
> +    the required property:
> +
> +    - compatible: Should be the following:
> +                  "sprd,sc9863a-glbregs", "syscon", "simple-mfd"
> +
> +    The 'reg' property is also required if there is a sub range of
> +    registers for the clocks that are contiguous.

Which ones are these? You should be able to define that exactly starting 
with the example below.

> +
> +examples:
> +  - |
> +    ap_clk: clock-controller@...00000 {
> +      compatible = "sprd,sc9863a-ap-clk";
> +      reg = <0 0x21500000 0 0x1000>;
> +      clocks = <&ext_26m>, <&ext_32k>;
> +      clock-names = "ext-26m", "ext-32k";
> +      #clock-cells = <1>;
> +    };
> +
> +  - |
> +    soc {
> +      #address-cells = <2>;
> +      #size-cells = <2>;
> +
> +      ap_ahb_regs: syscon@...00000 {
> +        compatible = "sprd,sc9863a-glbregs", "syscon", "simple-mfd";
> +        reg = <0 0x20e00000 0 0x4000>;
> +        #address-cells = <1>;
> +        #size-cells = <1>;
> +        ranges = <0 0 0x20e00000 0x4000>;
> +
> +        apahb_gate: apahb-gate@0 {
> +          compatible = "sprd,sc9863a-apahb-gate";
> +          reg = <0x0 0x1020>;
> +          #clock-cells = <1>;

Doesn't this block have input clocks?

> +        };
> +      };
> +    };
> +
> +...
> -- 
> 2.20.1
>