Re: [PATCH] arm64: dts: qcom: shikra: Enable dTPM on EVK boards

[Khalid Faisal Ansari <khalid.ansari@oss.qualcomm.com>]

On 8/20/2026 2:52 PM, Konrad Dybcio wrote:
> On 8/20/26 11:16 AM, Khalid Faisal Ansari wrote:
>> The Shikra EVK boards (CQM, CQS, IQS) carry an ST33 discrete TPM
>> connected via SPI5. Enable the SPI controller and add the TPM node
>> with the ST33HTPM compatible and a 20 MHz max clock.
>>
>> Depends-on: https://lore.kernel.org/all/20260820085347.822-1-xueyao.an@oss.qualcomm.com/
> This is not a valid tag to put in the commit message
>
> Why haven't you sent the two clearly interdependent patches together?

I referenced the SPI5 enabling patch because the TPM node addition depends on that change being present. I had followed a similar approach used in an earlier submission (https://lore.kernel.org/all/0afa55d5-20bf-487b-abe0-4e2126ccf453@oss.qualcomm.com/), where the dependency was mentioned in the commit message.
Since the two changes originate from different internal ownership areas but are functionally interdependent, we have been handling them as separate submissions while documenting the dependency between them.

>> Signed-off-by: Khalid Faisal Ansari <khalid.ansari@oss.qualcomm.com>
>> ---
>> The Shikra EVK boards (CQM, CQS, IQS) have an ST33 discrete TPM (dTPM)
>> connected over SPI5. Enable the SPI controller and add the TPM node for
>> all three board variants.
>>
>> This series depends on the SPI5 node addition in shikra-evk.dtsi:
>>    https://lore.kernel.org/all/20260820085347.822-1-xueyao.an@oss.qualcomm.com/
>> ---
>>   arch/arm64/boot/dts/qcom/shikra-cqm-evk.dts | 10 ++++++++++
>>   arch/arm64/boot/dts/qcom/shikra-cqs-evk.dts | 10 ++++++++++
>>   arch/arm64/boot/dts/qcom/shikra-iqs-evk.dts | 10 ++++++++++
> Turn this into a single addition to shikra-evk.dtsi

I intentionally kept the changes in the individual board DTS files rather than placing them in shikra-evk.dtsi.
While the current EVK variants (CQM, CQS, and IQS) all carry the ST33 dTPM, a future board could potentially reuse shikra-evk.dtsi without supporting the TPM hardware. Keeping the node in the board-specific DTS files makes the hardware dependency explicit and avoids enabling TPM on boards where it may not be present.

>
> Konrad