Re: [PATCH v3 1/7] dt-bindings: embedded-controller: document ASUS Transformer EC

[Krzysztof Kozlowski <krzk@kernel.org>]

On 17/02/2026 12:05, Conor Dooley wrote:
> On Mon, Feb 16, 2026 at 09:14:40PM +0200, Svyatoslav Ryhel wrote:
>> пн, 16 лют. 2026 р. о 20:50 Conor Dooley <conor@kernel.org> пише:
>>>
>>> On Mon, Feb 16, 2026 at 08:22:38PM +0200, Svyatoslav Ryhel wrote:
>>>> пн, 16 лют. 2026 р. о 20:04 Conor Dooley <conor@kernel.org> пише:
>>>>>
>>>>> On Sat, Feb 14, 2026 at 08:09:53PM +0200, Svyatoslav Ryhel wrote:
>>>>>> Document embedded controller used in ASUS Transformer device series.
>>>>>>
>>>>>> Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
>>>>>> ---
>>>>>>  .../asus,transformer-ec.yaml                  | 98 +++++++++++++++++++
>>>>>>  1 file changed, 98 insertions(+)
>>>>>>  create mode 100644 Documentation/devicetree/bindings/embedded-controller/asus,transformer-ec.yaml
>>>>>>
>>>>>> diff --git a/Documentation/devicetree/bindings/embedded-controller/asus,transformer-ec.yaml b/Documentation/devicetree/bindings/embedded-controller/asus,transformer-ec.yaml
>>>>>> new file mode 100644
>>>>>> index 000000000000..670c4c2d339d
>>>>>> --- /dev/null
>>>>>> +++ b/Documentation/devicetree/bindings/embedded-controller/asus,transformer-ec.yaml
>>>>>> @@ -0,0 +1,98 @@
>>>>>> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
>>>>>> +%YAML 1.2
>>>>>> +---
>>>>>> +$id: http://devicetree.org/schemas/embedded-controller/asus,transformer-ec.yaml#
>>>>>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>>>>>> +
>>>>>> +title: ASUS Transformer's Embedded Controller
>>>>>> +
>>>>>> +description:
>>>>>> +  Several Nuvoton based Embedded Controllers attached to an I2C bus,
>>>>>> +  running a custom ASUS firmware, specific to the ASUS Transformer
>>>>>> +  device series.
>>>>>> +
>>>>>> +maintainers:
>>>>>> +  - Svyatoslav Ryhel <clamor95@gmail.com>
>>>>>> +
>>>>>> +allOf:
>>>>>> +  - $ref: /schemas/power/supply/power-supply.yaml
>>>>>> +
>>>>>> +properties:
>>>>>> +  compatible:
>>>>>> +    oneOf:
>>>>>> +      - enum:
>>>>>> +          - asus,p1801-t-ec-pad
>>>>>> +          - asus,sl101-ec-dock
>>>>>> +          - asus,tf600t-ec-pad
>>>>>> +          - asus,tf701t-ec-pad
>>>>>> +
>>>>>> +      - items:
>>>>>> +          - enum:
>>>>>> +              - asus,tf101-ec-dock
>>>>>> +              - asus,tf101g-ec-dock
>>>>>> +              - asus,tf201-ec-dock
>>>>>> +              - asus,tf300t-ec-dock
>>>>>> +              - asus,tf300tg-ec-dock
>>>>>> +              - asus,tf300tl-ec-dock
>>>>>> +              - asus,tf700t-ec-dock
>>>>>> +          - const: asus,transformer-ec-dock
>>>>>> +
>>>>>> +      - items:
>>>>>> +          - enum:
>>>>>> +              - asus,tf201-ec-pad
>>>>>> +              - asus,tf300t-ec-pad
>>>>>> +              - asus,tf300tg-ec-pad
>>>>>> +              - asus,tf300tl-ec-pad
>>>>>> +              - asus,tf700t-ec-pad
>>>>>> +          - const: asus,transformer-ec-pad
> 
>>>>> Also, why are some of the compatibles permitted standalone? That should
>>>>> be mentioned in your commit message too. Also, other than the sl101, the
>>>>> standalone ones seem to have the same match data in the mfd driver. Why
>>>>> are fallbacks not made use of there?
>>>>>
>>>>
>>>> Because standalone compatibles describe a unique hw configuration
>>>> which cannot be grouped into something meaningful. asus,p1801-t-ec-pad
>>>> is for EC of Tegra30/Intel based p1801-t AIO, asus,sl101-ec-dock is
>>>> for EC of Tegra20 slider tablet, asus,tf600t-ec-pad is for altered EC
>>>> in Win8 Tegra30 tablet, asus,tf701t-ec-pad is for Tegra114 tablet.
>>>> Different generations, different form-factors.
>>>
>>> I don't see any reasons here that eliminate fallback compatibles.
>>> +       { .compatible = "asus,p1801-t-ec-pad", .data = &asus_ec_pad_charger_data },
>>> +       { .compatible = "asus,tf600t-ec-pad", .data = &asus_ec_pad_charger_data },
>>> +       { .compatible = "asus,tf701t-ec-pad", .data = &asus_ec_pad_charger_data },
>>> +       { }
>>> Three of them use the same match data, so you need to explain why you've
>>> made these three standalone when all the others that share a programming
>>> model got a generic fallback. Fallback usage is based on programming
>>> model, not based on whether the devices are a physically different, so
>>> your explanation must reflect this.
>>>
>>>>> Since this transformer series seems to have multiple programming models
>>>>> for "ec-pad" devices, it calls into question your use of the generic
>>>>> fallback compatibles is appropriate and makes it seem like you should be
>>>>> using device compatibles as a fallback.
>>>>
>>>> That is redundant.
>>>
>>> I don't understand how that is a response to what I said.
>>>
>>
>> in other words you propose this:
>>
>> properties:
>>   compatible:
>>     oneOf:
>>       - items:
>>           - enum:
>>               - asus,sl101-ec-dock
>>               - asus,tf101-ec-dock
>>               - asus,tf101g-ec-dock
>>               - asus,tf201-ec-dock
>>               - asus,tf300t-ec-dock
>>               - asus,tf300tg-ec-dock
>>               - asus,tf300tl-ec-dock
>>               - asus,tf700t-ec-dock
>>           - const: asus,transformer-ec-dock
>>
>>       - items:
>>           - enum:
>>               - asus,p1801-t-ec-pad
>>               - asus,tf201-ec-pad
>>               - asus,tf300t-ec-pad
>>               - asus,tf300tg-ec-pad
>>               - asus,tf300tl-ec-pad
>>               - asus,tf700t-ec-pad
>>               - asus,tf600t-ec-pad
>>               - asus,tf701t-ec-pad
>>           - const: asus,transformer-ec-pad
>>
>> And in the driver add match to every single entry of enums?
> 
> No, I was talking about removing the generic compatibles entirely, since
> they are not suitably generic to cover all devices at the point of
> addition. So like:

Yep. Generic compatible has hardly a meaning if you already know it is
not generic enough - some devices are not compatible with it.

Each SoC/platform which pushed to these generic compatible, hit a wall
after some months/years. Apple is a nice example now.


Best regards,
Krzysztof