Re: [PATCH v2 1/2] dt-bindings: Document the hi6220 thermal sensor bindings

[Matt Porter <mporter-OWPKS81ov/FWk0Htik3J/w@public.gmane.org>]

On Tue, Mar 31, 2015 at 02:59:21PM +0800, Xinwei Kong wrote:
> From: kongxinwei <kong.kongxinwei-C8/M+/jPZTeaMJb+Lgu22Q@public.gmane.org>
> 
> This adds documentation of device tree bindings for the
> thermal sensor controller of hi6220 SoC.
> 
> Signed-off-by: Leo Yan <leo.yan-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
> Signed-off-by: kongxinwei <kong.kongxinwei-C8/M+/jPZTeaMJb+Lgu22Q@public.gmane.org>
> ---
>  .../bindings/thermal/hisilicon-thermal.txt         | 45 ++++++++++++++++++++++
>  1 file changed, 45 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/thermal/hisilicon-thermal.txt
> 
> diff --git a/Documentation/devicetree/bindings/thermal/hisilicon-thermal.txt b/Documentation/devicetree/bindings/thermal/hisilicon-thermal.txt
> new file mode 100644
> index 0000000..ceb6e2e
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/thermal/hisilicon-thermal.txt
> @@ -0,0 +1,45 @@
> +* Hisilicon Thermal
> +
> +This driver is for hi6220 SoC which contain 4 thermal sensor.
> +
> +	1. sensor 0: local sensor;
> +	2. sensor 1: remote sensor for ACPU cluster 1;
> +	3. sensor 2: remote sensor for ACPU cluster 2;
> +	4. sensor 3: remote sensor for GPU.
> +
> +Every sensor use one child node to represent it, so thermal sensor include
> +parent node and four child node. The parent node describe common feature and
> +child node describe private feature for thermal sensor;
> +
> +** Required properties :
> +
> +- compatible: "hisilicon,tsensor".
> +- reg: physical base address of thermal sensor and length of memory mapped
> +  region.
> +- interrupt: The interrupt number to the cpu. Defines the interrupt used
> +  by SOCTHERM.
> +- clock-names: Input clock name, should be 'thermal_clk'.
> +- clocks: phandles for clock specified in "clock-names" property.
> +- #thermal-sensor-cells: Should be 1. See ./thermal.txt for a description.
> +
> +** Required properties for child nodes :
> +
> +- hisilicon,tsensor-id: the index of thermal sensor and use it to distinguish
> +  thermal sensor. For example: <0> stands for local sensor; <1> stands for
> +  acpu1 sensor;

Please show an example illustrating why this property is needed. The
example below doesn't show any per sensor properties aside from the
sensor id. Other bindings with a similar sub-sensor hardware design like
tegra-soctherm and rockchip-thermal don't have a need for a vendor
specific property like this. Their drivers simply iterate over an id
index during thermal sensor registration.

-Matt

> +
> +Example :
> +
> +	tsensor: tsensor@0,f7030700 {
> +		compatible = "hisilicon,tsensor";
> +		reg = <0x0 0xf7030700 0x0 0x1000>;
> +		interrupts = <0 7 0x4>;
> +		clocks = <&clock_sys HI6220_TSENSOR_CLK>;
> +		clock-names = "thermal_clk";
> +		#thermal-sensor-cells = <1>;
> +
> +		local_sensor {
> +			hisilicon,tsensor-id = <0>;
> +		}
> +		.......
> +	}
> -- 
> 1.9.1
> 
> 
> 
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