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SubjectRe: [PATCH v4 1/6] dt-bindings: update the Allwinner GPADC device tree binding for H3
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于 2017年9月18日 GMT+08:00 下午3:33:36, Maxime Ripard <maxime.ripard@free-electrons.com> 写到:
>On Thu, Sep 14, 2017 at 10:52:46PM +0800, Icenowy Zheng 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'd prefer to have which sensor it applies to here. It wouldn't change
>anything for the H3, but it definitely does for example for the A83t
>that has two sensors, one for each cluster, and one for the GPU, each
>with calibration data.
>
>What about cluster0-calibration?

The calibration data is in fact a 2 word (8 bytes) zone,
which is reserved for 4 sensors on all SoCs, even on H3.
It's half word per sensor.

I prefer to just assume a 2 word cell for every SoC.

>
>> +
>> +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,
>
>For resets and interrupts, you should list all of them. If there's
>only one, then there's no point telling which one it is.
>
>
>Thanks,
>Maxime

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