Re: [PATCH v2 4/4] media: qcom: camss: Report hardware version via media controller

[Bryan O'Donoghue]

On 21/07/2026 14:21, Loic Poulain wrote:
> Populate media_dev.hw_revision with the top-level CAMSS hardware version
> so that user space can query the exact hardware variant through the media
> controller (e.g. via media-ctl or MEDIA_IOC_DEVICE_INFO). This can help
> identify the platform variant and adapt behaviour accordingly, for example
> allowing libcamera to apply quirks or enable features that cannot be
> discovered through standard V4L2 or media-controller APIs.
>
> The version register is exposed by some platforms through the top-level
> "top" reg region (offset 0). When present, map it and read the version
> once at probe. This is a no-op on platforms not mapping the region (yet).
>
> Reported media info on Agatti/CM2290 (Spectra 520):
> Media Driver Info:
>          Driver name      : qcom-camss
>          Model            : Qualcomm Camera Subsystem
>          Bus info         : platform:5c11000.camss
>          Hardware revision: 0x00050200 (328192)
>
> Reviewed-by: Konrad Dybcio <konrad.dybcio@xxxxxxxxxxxxxxxx>
> Signed-off-by: Loic Poulain <loic.poulain@xxxxxxxxxxxxxxxx>
Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@xxxxxxxxxx>