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SubjectRe: [PATCH v4 1/6] dt-bindings: update the Allwinner GPADC device tree binding for H3
On Thu, 14 Sep 2017 22:52:46 +0800
Icenowy Zheng <icenowy@aosc.io> wrote:

> Allwinner H3 features a thermal sensor like the one in A33, but has its
> register re-arranged, the clock divider moved to CCU (originally the
> clock divider is in ADC) and added a pair of bus clock and reset.
>
> Update the binding document to cover H3.
>
> Signed-off-by: Icenowy Zheng <icenowy@aosc.io>
> Reviewed-by: Chen-Yu Tsai <wens@csie.org>
> ---
> Changes in v4:
> - Add nvmem calibration data (not yet used by the driver)
> Changes in v3:
> - Clock name changes.
> - Example node name changes.
> - Add interupts (not yet used by the driver).
>
> .../devicetree/bindings/mfd/sun4i-gpadc.txt | 30 ++++++++++++++++++++--
> 1 file changed, 28 insertions(+), 2 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/mfd/sun4i-gpadc.txt b/Documentation/devicetree/bindings/mfd/sun4i-gpadc.txt
> index badff3611a98..6c470d584bf9 100644
> --- a/Documentation/devicetree/bindings/mfd/sun4i-gpadc.txt
> +++ b/Documentation/devicetree/bindings/mfd/sun4i-gpadc.txt
> @@ -4,12 +4,26 @@ The Allwinner SoCs all have an ADC that can also act as a thermal sensor
> and sometimes as a touchscreen controller.
>
> Required properties:
> - - compatible: "allwinner,sun8i-a33-ths",
> + - compatible: must contain one of the following compatibles:
> + - "allwinner,sun8i-a33-ths"
> + - "allwinner,sun8i-h3-ths"
> - reg: mmio address range of the chip,
> - #thermal-sensor-cells: shall be 0,
> - #io-channel-cells: shall be 0,
>
> -Example:
> +Optional properties:
> + - nvmem-cells: A phandle to the calibration data provided by a nvmem device.
> + If unspecified default values shall be used.
> + - nvmem-cell-names: Should be "calibration-data"

I think a cross reference to the nvmem binding docs would be good here.
It wasn't something I could remember coming across before. Obviously
grep gets you there quickly enough, but a cross reference would be even
better.

Also would it make sense to have an example with these in?

Jonathan
> +
> +Required properties for the following compatibles:
> + - "allwinner,sun8i-h3-ths"
> + - clocks: the bus clock and the input clock of the ADC,
> + - clock-names: should be "bus" and "mod",
> + - resets: the bus reset of the ADC,
> + - interrupts: the sampling interrupt of the ADC,
> +
> +Example for A33:
> ths: ths@01c25000 {
> compatible = "allwinner,sun8i-a33-ths";
> reg = <0x01c25000 0x100>;
> @@ -17,6 +31,18 @@ Example:
> #io-channel-cells = <0>;
> };
>
> +Example for H3:
> + ths: thermal-sensor@1c25000 {
> + compatible = "allwinner,sun8i-h3-ths";
> + reg = <0x01c25000 0x400>;
> + clocks = <&ccu CLK_BUS_THS>, <&ccu CLK_THS>;
> + clock-names = "bus", "mod";
> + resets = <&ccu RST_BUS_THS>;
> + interrupts = <GIC_SPI 31 IRQ_TYPE_LEVEL_HIGH>;
> + #thermal-sensor-cells = <0>;
> + #io-channel-cells = <0>;
> + };
> +
> sun4i, sun5i and sun6i SoCs are also supported via the older binding:
>
> sun4i resistive touchscreen controller

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