Re: [PATCH V3 4/5] arm64: dts: qcom: x1-crd: Add Embedded controller node

[Krzysztof Kozlowski <krzk@kernel.org>]

On 09/03/2026 11:51, Sibi Sankar wrote:
> 
> On 3/9/2026 2:39 PM, Krzysztof Kozlowski wrote:
>> On 09/03/2026 10:03, Sibi Sankar wrote:
>>> On 3/9/2026 12:55 PM, Krzysztof Kozlowski wrote:
>>>> On Mon, Mar 09, 2026 at 05:06:45AM +0530, Sibi Sankar wrote:
>>>>> Add embedded controller node for Hamoa/Purwa CRDs which adds fan control,
>>>>> temperature sensors, access to EC internal state changes and suspend
>>>>> entry/exit notifications to the EC.
>>>>>
>>>>> Signed-off-by: Sibi Sankar <sibi.sankar@oss.qualcomm.com>
>>>>> ---
>>>>>    arch/arm64/boot/dts/qcom/x1-crd.dtsi | 16 ++++++++++++++++
>>>>>    1 file changed, 16 insertions(+)
>>>>>
>>>>> diff --git a/arch/arm64/boot/dts/qcom/x1-crd.dtsi b/arch/arm64/boot/dts/qcom/x1-crd.dtsi
>>>>> index ded96fb43489..29a1aeb98353 100644
>>>>> --- a/arch/arm64/boot/dts/qcom/x1-crd.dtsi
>>>>> +++ b/arch/arm64/boot/dts/qcom/x1-crd.dtsi
>>>>> @@ -1042,6 +1042,16 @@ eusb6_repeater: redriver@4f {
>>>>>    
>>>>>    		#phy-cells = <0>;
>>>>>    	};
>>>>> +
>>>>> +	embedded-controller@76 {
>>>>> +		compatible = "qcom,hamoa-it8987-ec", "qcom,hamoa-ec";
>>>> I don't see updates to other x1e boards, thus my arguments from v2 stay
>>>> valid. It's wrong to call it "hamoa-ec" since only one Hamoa board has
>>>> it. All of other Hamoa boards apparently do not have it.
>>>
>>> Hey Krzysztof,
>>> Thanks for taking time to review the series :)
>>>
>>> What other Hamoa boards are you referring to? The series
>>> mentions that the driver and bindings is meant for Qualcomm
>>> Hamoa/Purwa/Glymur "reference" devices, so it only covers
>>> CRD and IOT-EVK. It definitely does not cover all Hamoa boards
>>> boards like you are assuming.
>> hamoa-ec compatible implies that and that's something I raised in v2
>> already. You need a specific compatible.
> 
> 
> Hamoa/Glymur reference devices can have different EC MCUs
> depending on the SKU. This introduces the need to deal with
> possibility of quirks and bugs introduced by these differences.
> Hamoa/Purwa CRDs and IOT EVK runs on IT8987, while Glymur
> reference devices run on NPCX498/488. This pretty much was

None of these answer my comments from here and v2.

> the rationale to make the MCU part of the compatible. Anyway
> I can keep it as qcom,hamoa-ec and qcom,glymur-ec for now

No. You cannot add a generic compatible when you claim it is not even
correct - "different EC depending on the SKU".

Best regards,
Krzysztof