linux-kernel - Re: [RFC PATCH v2 1/4] dt-bindings: update the Allwinner GPADC device tree binding for H3

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Date:   Wed, 5 Apr 2017 14:04:02 -0500
From:   Rob Herring <robh@...nel.org>
To:     Icenowy Zheng <icenowy@...c.io>
Cc:     "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        "linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Quentin Schulz <quentin.schulz@...e-electrons.com>,
        linux-sunxi <linux-sunxi@...glegroups.com>,
        Jonathan Cameron <jic23@...nel.org>,
        Maxime Ripard <maxime.ripard@...e-electrons.com>,
        Chen-Yu Tsai <wens@...e.org>, Lee Jones <lee.jones@...aro.org>,
        Zhang Rui <rui.zhang@...el.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [RFC PATCH v2 1/4] dt-bindings: update the Allwinner GPADC device
 tree binding for H3

On Tue, Apr 4, 2017 at 10:02 AM, Icenowy Zheng <icenowy@...c.io> wrote:
>
>
> 在 2017年04月04日 22:47, Rob Herring 写道:
>>
>> On Sun, Apr 02, 2017 at 09:33:01PM +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@...c.io>
>>> ---
>>>  .../devicetree/bindings/mfd/sun4i-gpadc.txt        | 23
>>> ++++++++++++++++++++--
>>>  1 file changed, 21 insertions(+), 2 deletions(-)
>>>
>>> diff --git a/Documentation/devicetree/bindings/mfd/sun4i-gpadc.txt
>>> b/Documentation/devicetree/bindings/mfd/sun4i-gpadc.txt
>>> index badff3611a98..7753133ca0ff 100644
>>> --- a/Documentation/devicetree/bindings/mfd/sun4i-gpadc.txt
>>> +++ b/Documentation/devicetree/bindings/mfd/sun4i-gpadc.txt
>>> @@ -4,12 +4,20 @@ 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:
>>> +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 "ths",
>>> +  - resets: the bus reset of the ADC,
>>> +
>>> +Example for A33:
>>>         ths: ths@...25000 {
>>>                 compatible = "allwinner,sun8i-a33-ths";
>>>                 reg = <0x01c25000 0x100>;
>>> @@ -17,6 +25,17 @@ Example:
>>>                 #io-channel-cells = <0>;
>>>         };
>>>
>>> +Example for H3:
>>> +       ths: ths@...25000 {
>>
>>
>> adc@...
>
>
> It's a thermal sensor, so I think call it THS is more appropriate
> here. It's implemented as an ADC driver just because the internal
> code reusing of Linux. From device tree binding view I choose to
> call it ths.

There's numerous occurrences in this file and the filename that call it an ADC.

Furthermore, node names are supposed to be generic, not part #'s or
whatever you decide to make up. So pick from adc or temperature-sensor
as those are the standard names .

Rob