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Date:   Tue, 10 Aug 2021 20:46:24 +0300
From:   Sam Protsenko <semen.protsenko@...aro.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
Cc:     Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Sylwester Nawrocki <s.nawrocki@...sung.com>,
        Tomasz Figa <tomasz.figa@...il.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        linux-clk <linux-clk@...r.kernel.org>,
        devicetree <devicetree@...r.kernel.org>,
        linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
        Linux Samsung SOC <linux-samsung-soc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 6/8] dt-bindings: clock: samsung: convert Exynos AudSS
 to dtschema

On Tue, 10 Aug 2021 at 12:32, Krzysztof Kozlowski
<krzysztof.kozlowski@...onical.com> wrote:
>
> Convert Samsung Exynos Audio SubSystem clock controller bindings to DT
> schema format using json-schema.
>
> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
> ---
>  .../bindings/clock/clk-exynos-audss.txt       | 103 ------------------
>  .../clock/samsung,exynos-audss-clock.yaml     |  79 ++++++++++++++
>  2 files changed, 79 insertions(+), 103 deletions(-)
>  delete mode 100644 Documentation/devicetree/bindings/clock/clk-exynos-audss.txt
>  create mode 100644 Documentation/devicetree/bindings/clock/samsung,exynos-audss-clock.yaml
>
> diff --git a/Documentation/devicetree/bindings/clock/clk-exynos-audss.txt b/Documentation/devicetree/bindings/clock/clk-exynos-audss.txt
> deleted file mode 100644
> index 6030afb10b5c..000000000000
> --- a/Documentation/devicetree/bindings/clock/clk-exynos-audss.txt
> +++ /dev/null
> @@ -1,103 +0,0 @@
> -* Samsung Audio Subsystem Clock Controller
> -
> -The Samsung Audio Subsystem clock controller generates and supplies clocks
> -to Audio Subsystem block available in the S5PV210 and Exynos SoCs. The clock
> -binding described here is applicable to all SoCs in Exynos family.
> -
> -Required Properties:
> -
> -- compatible: should be one of the following:
> -  - "samsung,exynos4210-audss-clock" - controller compatible with all Exynos4 SoCs.
> -  - "samsung,exynos5250-audss-clock" - controller compatible with Exynos5250
> -    SoCs.
> -  - "samsung,exynos5410-audss-clock" - controller compatible with Exynos5410
> -    SoCs.
> -  - "samsung,exynos5420-audss-clock" - controller compatible with Exynos5420
> -    SoCs.
> -- reg: physical base address and length of the controller's register set.
> -
> -- #clock-cells: should be 1.
> -
> -- clocks:
> -  - pll_ref: Fixed rate PLL reference clock, parent of mout_audss. "fin_pll"
> -    is used if not specified.
> -  - pll_in: Input PLL to the AudioSS block, parent of mout_audss. "fout_epll"
> -    is used if not specified.
> -  - cdclk: External i2s clock, parent of mout_i2s. "cdclk0" is used if not
> -    specified.
> -  - sclk_audio: Audio bus clock, parent of mout_i2s. "sclk_audio0" is used if
> -    not specified.
> -  - sclk_pcm_in: PCM clock, parent of sclk_pcm.  "sclk_pcm0" is used if not
> -    specified.
> -
> -- clock-names: Aliases for the above clocks. They should be "pll_ref",
> -  "pll_in", "cdclk", "sclk_audio", and "sclk_pcm_in" respectively.
> -
> -Optional Properties:
> -
> -  - power-domains: a phandle to respective power domain node as described by
> -    generic PM domain bindings (see power/power_domain.txt for more
> -    information).
> -
> -The following is the list of clocks generated by the controller. Each clock is
> -assigned an identifier and client nodes use this identifier to specify the
> -clock which they consume. Some of the clocks are available only on a particular
> -Exynos4 SoC and this is specified where applicable.
> -
> -Provided clocks:
> -
> -Clock           ID      SoC (if specific)
> ------------------------------------------------
> -
> -mout_audss      0
> -mout_i2s        1
> -dout_srp        2
> -dout_aud_bus    3
> -dout_i2s        4
> -srp_clk         5
> -i2s_bus         6
> -sclk_i2s        7
> -pcm_bus         8
> -sclk_pcm        9
> -adma            10      Exynos5420
> -
> -Example 1: An example of a clock controller node using the default input
> -          clock names is listed below.
> -
> -clock_audss: audss-clock-controller@...0000 {
> -       compatible = "samsung,exynos5250-audss-clock";
> -       reg = <0x03810000 0x0C>;
> -       #clock-cells = <1>;
> -};
> -
> -Example 2: An example of a clock controller node with the input clocks
> -           specified.
> -
> -clock_audss: audss-clock-controller@...0000 {
> -       compatible = "samsung,exynos5250-audss-clock";
> -       reg = <0x03810000 0x0C>;
> -       #clock-cells = <1>;
> -       clocks = <&clock 1>, <&clock 7>, <&clock 138>, <&clock 160>,
> -               <&ext_i2s_clk>;
> -       clock-names = "pll_ref", "pll_in", "sclk_audio", "sclk_pcm_in", "cdclk";
> -};
> -
> -Example 3: I2S controller node that consumes the clock generated by the clock
> -           controller. Refer to the standard clock bindings for information
> -           about 'clocks' and 'clock-names' property.
> -
> -i2s0: i2s@...0000 {
> -       compatible = "samsung,i2s-v5";
> -       reg = <0x03830000 0x100>;
> -       dmas = <&pdma0 10
> -               &pdma0 9
> -               &pdma0 8>;
> -       dma-names = "tx", "rx", "tx-sec";
> -       clocks = <&clock_audss EXYNOS_I2S_BUS>,
> -               <&clock_audss EXYNOS_I2S_BUS>,
> -               <&clock_audss EXYNOS_SCLK_I2S>,
> -               <&clock_audss EXYNOS_MOUT_AUDSS>,
> -               <&clock_audss EXYNOS_MOUT_I2S>;
> -       clock-names = "iis", "i2s_opclk0", "i2s_opclk1",
> -                     "mout_audss", "mout_i2s";
> -};

Seems like some examples and "Provided clocks" table were dropped in
in yaml binding. Also there is no description for example present in
yaml file. Is that some redundant info and was dropped intentionally?
I'm just worrying about losing some useful info during the conversion.

> diff --git a/Documentation/devicetree/bindings/clock/samsung,exynos-audss-clock.yaml b/Documentation/devicetree/bindings/clock/samsung,exynos-audss-clock.yaml
> new file mode 100644
> index 000000000000..d60b29fa22e7
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/clock/samsung,exynos-audss-clock.yaml
> @@ -0,0 +1,79 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/clock/samsung,exynos-audss-clock.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Samsung Exynos SoC Audio SubSystem clock controller
> +
> +maintainers:
> +  - Chanwoo Choi <cw00.choi@...sung.com>
> +  - Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
> +  - Sylwester Nawrocki <s.nawrocki@...sung.com>
> +  - Tomasz Figa <tomasz.figa@...il.com>
> +
> +description: |
> +  All available clocks are defined as preprocessor macros in
> +  include/dt-bindings/clock/exynos-audss-clk.h header.
> +
> +properties:
> +  compatible:
> +    enum:
> +      - samsung,exynos4210-audss-clock
> +      - samsung,exynos5250-audss-clock
> +      - samsung,exynos5410-audss-clock
> +      - samsung,exynos5420-audss-clock
> +
> +  clocks:
> +    minItems: 2
> +    items:
> +      - description:
> +          Fixed rate PLL reference clock, parent of mout_audss. "fin_pll" is
> +          used if not specified.
> +      - description:
> +          Input PLL to the AudioSS block, parent of mout_audss. "fout_epll" is
> +          used if not specified.
> +      - description:
> +          Audio bus clock, parent of mout_i2s. "sclk_audio0" is used if not
> +          specified.
> +      - description:
> +          PCM clock, parent of sclk_pcm.  "sclk_pcm0" is used if not specified.
> +      - description:
> +          External i2s clock, parent of mout_i2s. "cdclk0" is used if not
> +          specified.
> +
> +  clock-names:
> +    minItems: 2
> +    items:
> +      - const: pll_ref
> +      - const: pll_in
> +      - const: sclk_audio
> +      - const: sclk_pcm_in
> +      - const: cdclk
> +
> +  "#clock-cells":
> +    const: 1
> +
> +  power-domains: true
> +
> +  reg:
> +    maxItems: 1
> +
> +required:
> +  - compatible
> +  - clocks
> +  - clock-names
> +  - "#clock-cells"
> +  - reg
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    clock-controller@...0000 {
> +        compatible = "samsung,exynos5250-audss-clock";
> +        reg = <0x03810000 0x0c>;
> +        #clock-cells = <1>;
> +        clocks = <&clock 1>, <&clock 7>, <&clock 138>, <&clock 160>, <&ext_i2s_clk>;
> +        clock-names = "pll_ref", "pll_in", "sclk_audio", "sclk_pcm_in", "cdclk";
> +    };
> --
> 2.30.2
>

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