linux-kernel - Re: [PATCH v4 1/5] Documentation: add DT bindings for ARM SCPI sensors

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Message-ID: <CAL_Jsq+_Rrv5XqNsL-gwQZv3HK20dQC3jY7qCoxQ8KWhhs4Fdw@mail.gmail.com>
Date:	Tue, 29 Sep 2015 13:20:55 -0500
From:	Rob Herring <robh@...nel.org>
To:	Punit Agrawal <punit.agrawal@....com>
Cc:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Mark Rutland <mark.rutland@....com>,
	Rob Herring <robh+dt@...nel.org>,
	Eduardo Valentin <edubezval@...il.com>,
	Sudeep Holla <sudeep.holla@....com>,
	Liviu Dudau <liviu.dudau@....com>,
	Guenter Roeck <linux@...ck-us.net>
Subject: Re: [PATCH v4 1/5] Documentation: add DT bindings for ARM SCPI sensors

On Tue, Sep 15, 2015 at 11:50 AM, Punit Agrawal <punit.agrawal@....com> wrote:
> The System Control Processor (SCP) provides access to SoC sensors via
> the System Control and Power Interface (SCPI) Message Protocol. Add
> bindings to allow probing of these sensors. Also support referencing
> of the sensors for setting up thermal zones via the thermal DT
> bindings.
>
> Signed-off-by: Punit Agrawal <punit.agrawal@....com>
> Cc: Rob Herring <robh+dt@...nel.org>

Acked-by: Rob Herring <robh@...nel.org>

> Cc: Mark Rutland <mark.rutland@....com>
> Cc: Sudeep Holla <sudeep.holla@....com>
> ---
>  Documentation/devicetree/bindings/arm/arm,scpi.txt | 38 ++++++++++++++++++++++
>  1 file changed, 38 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/arm/arm,scpi.txt b/Documentation/devicetree/bindings/arm/arm,scpi.txt
> index f002460..86302de 100644
> --- a/Documentation/devicetree/bindings/arm/arm,scpi.txt
> +++ b/Documentation/devicetree/bindings/arm/arm,scpi.txt
> @@ -72,8 +72,25 @@ Required sub-node properties:
>  - compatible : should be "arm,juno-scp-shmem" for Non-secure SRAM based
>                shared memory on Juno platforms
>
> +Sensor bindings for the sensors based on SCPI Message Protocol
> +--------------------------------------------------------------
> +SCPI provides an API to access the various sensors on the SoC.
> +
> +Required properties:
> +- compatible : should be "arm,scpi-sensors".
> +- #thermal-sensor-cells: should be set to 1. This property follows the
> +                        thermal device tree bindings[2].
> +
> +                        Valid cell values are raw identifiers (Sensor
> +                        ID) as used by the firmware. Refer to
> +                        platform documentation for your
> +                        implementation for the IDs to use. For Juno
> +                        R0 and Juno R1 refer to [3].
> +
>  [0] http://infocenter.arm.com/help/topic/com.arm.doc.dui0922b/index.html
>  [1] Documentation/devicetree/bindings/clock/clock-bindings.txt
> +[2] Documentation/devicetree/bindings/thermal/thermal.txt
> +[3] http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0922b/apas03s22.html
>
>  Example:
>
> @@ -122,6 +139,11 @@ scpi_protocol: scpi@...00000 {
>                         clock-output-names = "pxlclk0", "pxlclk1";
>                 };
>         };
> +
> +       scpi_sensors0: sensors {
> +               compatible = "arm,scpi-sensors";
> +               #thermal-sensor-cells = <1>;
> +       };
>  };
>
>  cpu@0 {
> @@ -136,6 +158,17 @@ hdlcd@...60000 {
>         clocks = <&scpi_clk 4>;
>  };
>
> +thermal-zones {
> +       soc_thermal {
> +               polling-delay-passive = <100>;
> +               polling-delay = <1000>;
> +
> +                               /* sensor         ID */
> +               thermal-sensors = <&scpi_sensors0 3>;
> +               ...
> +       };
> +};
> +
>  In the above example, the #clock-cells is set to 1 as required.
>  scpi_dvfs has 3 output clocks namely: atlclk, aplclk, and gpuclk with 0,
>  1 and 2 as clock-indices. scpi_clk has 2 output clocks namely: pxlclk0
> @@ -148,3 +181,8 @@ scpi_dvfs i.e. "atlclk".
>  Similarly the second example is hdlcd@...60000 and it has pxlclk1 as input
>  clock. '4' in the clock specifier here points to the second entry
>  in the output clocks of scpi_clocks  i.e. "pxlclk1"
> +
> +The thermal-sensors property in the soc_thermal node uses the
> +temperature sensor provided by SCP firmware to setup a thermal
> +zone. The ID "3" is the sensor identifier for the temperature sensor
> +as used by the firmware.
> --
> 2.5.1
>
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