linux-kernel - Re: [PATCH v7 10/14] dt-bindings: qcom_spmi: Add support for SAW documentation

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Message-ID: <CAHLCerOxcUMTztT75rdkS-rrQWqEEgoVQr45Ueh_JRPE7CCm7Q@mail.gmail.com>
Date:   Wed, 16 May 2018 16:12:52 +0300
From:   Amit Kucheria <amit.kucheria@...aro.org>
To:     Ilia Lin <ilialin@...eaurora.org>
Cc:     Michael Turquette <mturquette@...libre.com>, sboyd@...nel.org,
        Rob Herring <robh@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Viresh Kumar <viresh.kumar@...aro.org>, nm@...com,
        lgirdwood@...il.com, broonie@...nel.org,
        Andy Gross <andy.gross@...aro.org>,
        David Brown <david.brown@...aro.org>, catalin.marinas@....com,
        will.deacon@....com, "Rafael J. Wysocki" <rjw@...ysocki.net>,
        linux-clk@...r.kernel.org, devicetree@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>,
        Linux PM list <linux-pm@...r.kernel.org>,
        linux-arm-msm@...r.kernel.org, linux-soc@...r.kernel.org,
        lakml <linux-arm-kernel@...ts.infradead.org>,
        Rajendra Nayak <rnayak@...eaurora.org>,
        nicolas.dechesne@...aro.org, celster@...eaurora.org,
        tfinkel@...eaurora.org
Subject: Re: [PATCH v7 10/14] dt-bindings: qcom_spmi: Add support for SAW documentation

On Tue, May 15, 2018 at 12:13 PM, Ilia Lin <ilialin@...eaurora.org> wrote:
> Add support for SAW controlled regulators.
> The regulators defined as SAW controlled in the device tree
> will be controlled through special CPU registers instead of direct
> SPMI accesses.
> This is required especially for CPU supply regulators to synchronize
> with clock scaling and for Automatic Voltage Switching.
> Document it.

Replace this boiler plate with what this patch actual does. Besides
changing the subject, it could be, for example,

"Document the DT bindings for the SAW regulators.

The saw-slave property allows ganging (grouping) of several regulators
so that their outputs can be combined... blah blah.

The saw-leader is the only one that then is configurable in DT"


> Signed-off-by: Ilia Lin <ilialin@...eaurora.org>
> Reviewed-by: Rob Herring <robh@...nel.org>
> ---
>  .../bindings/regulator/qcom,spmi-regulator.txt     | 45 ++++++++++++++++++++++
>  1 file changed, 45 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/regulator/qcom,spmi-regulator.txt b/Documentation/devicetree/bindings/regulator/qcom,spmi-regulator.txt
> index 57d2c65..406f2e5 100644
> --- a/Documentation/devicetree/bindings/regulator/qcom,spmi-regulator.txt
> +++ b/Documentation/devicetree/bindings/regulator/qcom,spmi-regulator.txt
> @@ -110,6 +110,11 @@ Qualcomm SPMI Regulators
>         Definition: Reference to regulator supplying the input pin, as
>                     described in the data sheet.
>
> +- qcom,saw-reg:
> +       Usage: optional
> +       Value type: <phandle>
> +       Description: Reference to syscon node defining the SAW registers.
> +
>
>  The regulator node houses sub-nodes for each regulator within the device. Each
>  sub-node is identified using the node's name, with valid values listed for each
> @@ -201,6 +206,17 @@ see regulator.txt - with additional custom properties described below:
>                         2 = 0.55 uA
>                         3 = 0.75 uA
>
> +- qcom,saw-slave:
> +       Usage: optional
> +       Value type: <boo>
> +       Description: SAW controlled gang slave. Will not be configured.
> +
> +- qcom,saw-leader:
> +       Usage: optional
> +       Value type: <boo>
> +       Description: SAW controlled gang leader. Will be configured as
> +                    SAW regulator.
> +
>  Example:
>
>         regulators {
> @@ -221,3 +237,32 @@ Example:
>
>                 ....
>         };
> +
> +Example 2:
> +
> +       saw3: syscon@...0000 {
> +               compatible = "syscon";
> +               reg = <0x9A10000 0x1000>;
> +       };
> +
> +       ...
> +
> +       spm-regulators {
> +               compatible = "qcom,pm8994-regulators";
> +               qcom,saw-reg = <&saw3>;
> +               s8 {
> +                       qcom,saw-slave;
> +               };
> +               s9 {
> +                       qcom,saw-slave;
> +               };
> +               s10 {
> +                       qcom,saw-slave;
> +               };
> +               pm8994_s11_saw: s11 {
> +                       qcom,saw-leader;
> +                       regulator-always-on;
> +                       regulator-min-microvolt = <900000>;
> +                       regulator-max-microvolt = <1140000>;
> +               };
> +       };
> --
> 1.9.1
>