linux-kernel - Re: [PATCH v2 6/8] dt-bindings: clock: samsung: convert Exynos AudSS to dtschema

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Message-ID: <2f8ff138-4d34-619c-e137-099dc9251e25@canonical.com>
Date:   Wed, 11 Aug 2021 08:46:46 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
To:     Sam Protsenko <semen.protsenko@...aro.org>
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 10/08/2021 19:46, Sam Protsenko wrote:
> 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.

I don't see any point of having a clock consumer example in a clock
provider binding.


Best regards,
Krzysztof