Re: [PATCH v4 0/5] Add driver for EC found on Qualcomm reference devices

[Anvesh Jain P <anvesh.p@oss.qualcomm.com>]

On 3/13/2026 5:48 PM, Bryan O'Donoghue wrote:
> On 13/03/2026 10:29, Anvesh Jain P wrote:
>> From: Anvesh Jain P <anvesh.p@oss.qualcomm.com>
>>
>> Add Embedded controller driver support for Hamoa/Purwa/Glymur Qualcomm
>> reference boards. It handles fan control, temperature sensors, access
>> to EC state changes and supports reporting suspend entry/exit to the EC.
>>
>> ---
>> Changes in v4:
>>    - Fix fan count calculation to use min() instead of max() to correctly
>>      cap fan_cnt at EC_MAX_FAN_CNT.
>>    - Remove unnecessary mutex lock/unlock.
>>    - Disable fan debug mode on ec module removal.
>>    - Fix issue reported by kernel test robot.
>>    - Consolidate hamoa-iot-evk specific changes into hamoa-iot-evk.dts.
>>    - Add board-specific compatible strings as per review comments.
>>    - Link to v3: https://lore.kernel.org/all/20260308233646.2318676-1-
>> sibi.sankar@oss.qualcomm.com/
>>
>> Changes in v3:
>>    - Revamp the bindings and driver to support generic ec specification
>>      that works across Qualcomm Hamoa/Purwa and Glymur reference devices.
>>    - Add ec nodes to Hamoa/Purwa CRDs and IOT-EVKs.
>>    - Add ec node to Glymur CRDs.
>>    - Link to v2: https://lore.kernel.org/lkml/20241219200821.8328-1-
>> maccraft123mc@gmail.com/
>>    - Link to v1: https://lore.kernel.org/lkml/20240927185345.3680-1-
>> maccraft123mc@gmail.com/
>>
>> ---
>> Maya Matuszczyk (1):
>>        dt-bindings: embedded-controller: Add EC bindings for Qualcomm
>> reference devices
>>
>> Sibi Sankar (4):
>>        platform: arm64: Add driver for EC found on Qualcomm reference
>> devices
>>        arm64: dts: qcom: glymur-crd: Add Embedded controller node
>>        arm64: dts: qcom: x1-crd: Add Embedded controller node
>>        arm64: dts: qcom: hamoa-iot-evk: Add Embedded controller node
>>
>>   .../embedded-controller/qcom,hamoa-ec.yaml         |  56 +++
>>   MAINTAINERS                                        |   8 +
>>   arch/arm64/boot/dts/qcom/glymur-crd.dts            |  22 +
>>   arch/arm64/boot/dts/qcom/hamoa-iot-evk.dts         |  16 +
>>   arch/arm64/boot/dts/qcom/x1-crd.dtsi               |  16 +
>>   drivers/platform/arm64/Kconfig                     |  12 +
>>   drivers/platform/arm64/Makefile                    |   1 +
>>   drivers/platform/arm64/qcom-hamoa-ec.c             | 468 +++++++++++
>> ++++++++++
>>   8 files changed, 599 insertions(+)
>> ---
>> base-commit: a0ae2a256046c0c5d3778d1a194ff2e171f16e5f
>> change-id: 20260309-v04-add-driver-for-ec-3fa478f264d9
>>
>> Best regards,
> 
> 
> echo 'file qcom-hamoa-ec.c +p' > /sys/kernel/debug/dynamic_debug/control
> echo 6-0076 > /sys/bus/i2c/drivers/qcom-hamoa-ec/unbind
> echo 6-0076 > /sys/bus/i2c/drivers/qcom-hamoa-ec/bind
> dmesg | tail -n 15
> 
> [   27.301126] qcom-hamoa-ec 6-0076: EC Version 0.35.0
> [   27.311768] qcom-hamoa-ec 6-0076: Fan count: 0 Fan Type: 0 Thermistor
> Mask: 0
> 
> ?

Hey Bryan,
Thanks for trying out the patches. CRDs typically ship with
very old firmware, and updating them to the latest version
should allow the thermal information to be populated correctly.

> 
> ---
> bod

Best regards,
Anvesh