linux-kernel - Re: [PATCH V4 1/4] dt-bindings: imx: Add clock binding doc for i.MX8MN

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Date:   Thu, 6 Jun 2019 09:40:36 +0200
From:   Maxime Ripard <maxime.ripard@...tlin.com>
To:     Anson.Huang@....com
Cc:     mturquette@...libre.com, sboyd@...nel.org, robh+dt@...nel.org,
        mark.rutland@....com, shawnguo@...nel.org, s.hauer@...gutronix.de,
        kernel@...gutronix.de, festevam@...il.com, catalin.marinas@....com,
        will.deacon@....com, olof@...om.net, jagan@...rulasolutions.com,
        horms+renesas@...ge.net.au, bjorn.andersson@...aro.org,
        leonard.crestez@....com, dinguyen@...nel.org,
        enric.balletbo@...labora.com, aisheng.dong@....com,
        abel.vesa@....com, ping.bai@....com, l.stach@...gutronix.de,
        peng.fan@....com, linux-clk@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, Linux-imx@....com
Subject: Re: [PATCH V4 1/4] dt-bindings: imx: Add clock binding doc for
 i.MX8MN

Hi,

On Thu, Jun 06, 2019 at 09:33:20AM +0800, Anson.Huang@....com wrote:
> From: Anson Huang <Anson.Huang@....com>
>
> Add the clock binding doc for i.MX8MN.
>
> Signed-off-by: Anson Huang <Anson.Huang@....com>
> ---
> Changes since V3:
> 	- switch binding doc from .txt to .yaml.
> ---
>  .../devicetree/bindings/clock/imx8mn-clock.yaml    | 115 +++++++++++
>  include/dt-bindings/clock/imx8mn-clock.h           | 215 +++++++++++++++++++++
>  2 files changed, 330 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/clock/imx8mn-clock.yaml
>  create mode 100644 include/dt-bindings/clock/imx8mn-clock.h
>
> diff --git a/Documentation/devicetree/bindings/clock/imx8mn-clock.yaml b/Documentation/devicetree/bindings/clock/imx8mn-clock.yaml
> new file mode 100644
> index 0000000..8cb8fcf
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/clock/imx8mn-clock.yaml
> @@ -0,0 +1,115 @@
> +# SPDX-License-Identifier: GPL-2.0
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/bindings/clock/imx8mn-clock.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: NXP i.MX8M Nano Clock Control Module Binding
> +
> +maintainers:
> +  - Anson Huang <Anson.Huang@....com>
> +
> +description: |
> +  NXP i.MX8M Nano clock control module is an integrated clock controller, which
> +  generates and supplies to all modules.
> +
> +  This binding uses common clock bindings
> +  [1] Documentation/devicetree/bindings/clock/clock-bindings.txt

Which part exactly are you using?

I'm not sure it's worth referring to. Any provider property should be
listed here, and the consumer properties are already checked.

> +properties:
> +  compatible:
> +    const: fsl,imx8mn-ccm
> +
> +  reg:
> +    maxItems: 1
> +
> +  clocks:
> +    items:
> +      - description: 32k osc
> +      - description: 24m osc
> +      - description: ext1 clock input
> +      - description: ext2 clock input
> +      - description: ext3 clock input
> +      - description: ext4 clock input
> +
> +  clock-names:
> +    items:
> +      - const: osc_32k
> +      - const: osc_24m
> +      - const: clk_ext1
> +      - const: clk_ext2
> +      - const: clk_ext3
> +      - const: clk_ext4
> +
> +  '#clock-cells':
> +    const: 1
> +
> +required:
> +  - compatible
> +  - reg
> +  - clocks
> +  - clock-names
> +  - '#clock-cells'
> +
> +examples:
> +  # Clock Control Module node:
> +  - |
> +    clk: clock-controller@...80000 {
> +        compatible = "fsl,imx8mn-ccm";
> +        reg = <0x0 0x30380000 0x0 0x10000>;
> +        #clock-cells = <1>;
> +        clocks = <&osc_32k>, <&osc_24m>, <&clk_ext1>,
> +                 <&clk_ext2>, <&clk_ext3>, <&clk_ext4>;
> +        clock-names = "osc_32k", "osc_24m", "clk_ext1",
> +                      "clk_ext2", "clk_ext3", "clk_ext4";
> +    };
> +
> +  # Required external clocks for Clock Control Module node:
> +  - |
> +    osc_32k: clock-osc-32k {
> +        compatible = "fixed-clock";
> +        #clock-cells = <0>;
> +        clock-frequency = <32768>;
> +	clock-output-names = "osc_32k";
> +    };
> +
> +    osc_24m: clock-osc-24m {
> +        compatible = "fixed-clock";
> +        #clock-cells = <0>;
> +        clock-frequency = <24000000>;
> +        clock-output-names = "osc_24m";
> +    };
> +
> +    clk_ext1: clock-ext1 {
> +        compatible = "fixed-clock";
> +        #clock-cells = <0>;
> +        clock-frequency = <133000000>;
> +        clock-output-names = "clk_ext1";
> +    };
> +
> +    clk_ext2: clock-ext2 {
> +        compatible = "fixed-clock";
> +        #clock-cells = <0>;
> +        clock-frequency = <133000000>;
> +        clock-output-names = "clk_ext2";
> +    };
> +
> +    clk_ext3: clock-ext3 {
> +        compatible = "fixed-clock";
> +        #clock-cells = <0>;
> +        clock-frequency = <133000000>;
> +        clock-output-names = "clk_ext3";
> +    };
> +
> +    clk_ext4: clock-ext4 {
> +        compatible = "fixed-clock";
> +        #clock-cells = <0>;
> +        clock-frequency= <133000000>;
> +        clock-output-names = "clk_ext4";
> +    };
> +
> +  # The clock consumer should specify the desired clock by having the clock
> +  # ID in its "clocks" phandle cell. See include/dt-bindings/clock/imx8mn-clock.h
> +  # for the full list of i.MX8M Nano clock IDs.

I guess this could be part of the clock-cells description.

Once fixed,
Reviewed-by: Maxime Ripard <maxime.ripard@...tlin.com>

Maxime

--
Maxime Ripard, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

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