[PATCH v3 0/2] Add support for SA8255P in the phy-qcom-snps-femto-v2 phy driver

[Mattijs Korpershoek]

Hi Mani,

On Fri, Oct 02, 2026 at 11:41, Mattijs Korpershoek <mkorpershoek at kernel.org> wrote:

> The Qualcomm automotive SA8255p SoC relies on firmware to configure
> platform resources, including clocks, interconnects and TLMM.
> The driver requests resources operations over SCMI using power protocols.
>
> The SCMI power protocol enables or disables resources like clocks,
> interconnect paths, and TLMM (GPIOs) using runtime PM framework APIs,
> such as resume/suspend, to control power on/off.
>
> Power domain "core" controls the GDSC, resets, and TLMM (GPIOs)
> whereas power domain "transfer" controls clocks and interconnects.
>
> Patch 1 adds the binding for sa8255p. Similarly to what has been done
> for I2C [1], this is a separate binding.
>
> Patch 2 adds the driver change, which is based on a public vendor
> patch from qualcomm [2].
> I did the following changes on top of that:
> * Use devm_add_action_or_reset() for dev_pm_domain_detach_list() instead
>   of implementing a driver .remove()
> * Changed power domain names to drop 'usb_' prefix
> * Fixed various error handling paths
> * Added suspend/resume support
>
> This has been tested on next-20260728 with a Ride4 SA8775P board that
> has SCMI firmware (which is compatible).
>
> [1] https://lore.kernel.org/all/20260617-enable-i2c-on-sa8255p-v7-1-ad736dbeab57@oss.qualcomm.com/
> [2] https://git.codelinaro.org/clo/le/meta-qti-auto-kernel/-/blob/LY.AU.0.1.0.r1-16800-gen4meta.0/recipes-kernel/linux/files/usb/0014-PENDING-phy-qcom-snps-femto-v2-Add-support-for-SA825.patch
>
> Signed-off-by: Mattijs Korpershoek <mkorpershoek at kernel.org>

I don't know what happened but somehow I did not add you in To/Cc using
"b4 prep -c"

I've talked to Vinod at plumbers and he told me that I should request
some review on these phy patches.

Could you have a look whenever you have some time?

Thanks a lot for your help.
Mattijs

> ---
> Changes in v3:
> - Applied R-b from Krzysztof and Neil
> - Link to v2: https://patch.msgid.link/20260831-phy-qcom-snps-femto-v2-8255-v2-0-dc6197ffde1b@kernel.org
>
> Changes in v2:
> - Move 'core' as first domain, before 'transfer' (Krzysztof)
> - Reworded binding commit message to be more precise about the various
>   domains ('core', 'transfer' and 'perf') (Krzysztof)
> - Link to v1: https://patch.msgid.link/20260730-phy-qcom-snps-femto-v2-8255-v1-0-8b8bf5105a68@kernel.org
>
> ---
> Mattijs Korpershoek (1):
>       dt-bindings: phy: Add sa8255p high-speed USB PHY
>
> Sriram Dash (1):
>       phy: qcom-snps-femto-v2: Add support for SA8255P
>
>  .../bindings/phy/qcom,sa8255p-usb-hs-phy.yaml      |  52 +++++++++
>  drivers/phy/qualcomm/phy-qcom-snps-femto-v2.c      | 127 +++++++++++++++++++--
>  2 files changed, 170 insertions(+), 9 deletions(-)
> ---
> base-commit: e30626823a406725ce29bc75cb8ec467d3e1e326
> change-id: 20260729-phy-qcom-snps-femto-v2-8255-90ffe7674001
>
> Best regards,
> -- 
> Mattijs Korpershoek <mkorpershoek at kernel.org>