Re: [PATCH v2] arm64: dts: qcom: shikra: Add WCN clock to wcn3988-pmu node

[Bjorn Andersson <andersson@kernel.org>]

On Tue, Sep 29, 2026 at 03:31:29PM +0530, Yepuri Siddu wrote:
> With RPMCC proxy vote removal, the WCN clock must be explicitly declared
> so the wcn3988-pmu driver can vote for it during WCN power on/off.
> 
> Place the clock in the wcn3988-pmu node since the PMU driver owns the
> WCN power sequencing. CQM SOM uses RPM_SMD_RF_CLK2 while IQS SOM uses
> RPM_SMD_RF_CLK1, reflecting the WCN clock assignments on each board
> variant.
> 
> Signed-off-by: Yepuri Siddu <yepuri.siddu@oss.qualcomm.com>
> ---

Why do you have one problem description above and a different one below?

The information after "---" is not merged so the git history only
contains the one above - and there's some interesting details in the
description below. Perhaps this is the b4 "cover letter"?

Please revise the commit message above with some of these technical
details.

Thanks,
Bjorn

> clk_smd_rpm_handoff() votes both active and sleep RPM resource states for
> every clock, keeping them non-zero until a consumer takes over. On Shikra,
> the BT WCN clock was surviving on these proxy votes. With proxy vote
> removal on QCM2290 [1], the sleep vote is no longer held, which means the
> WCN clock must be explicitly declared in DTS so the wcn3988-pmu driver
> can manage it during power sequencing.
> 
> The clock is added to the wcn3988-pmu node in Shikra DTS. CQM SOM uses
> RPM_SMD_RF_CLK2 while IQS SOM uses RPM_SMD_RF_CLK1, reflecting the WCN
> clock assignments on each board variant.
> 
> Validations:
> - BT enable/disable verified on Shikra CQM, CQS and IQS EVK boards.
> - Confirmed WCN clock voted on BT enable and released on BT disable.
> 
> [1] https://lore.kernel.org/all/20260910-clk-smd-rpm-skip-proxy-v1-1-1cb5694a99d9@oss.qualcomm.com/
> ---
> Changes in v2:
> - Move clock property to wcn3988-pmu node instead of bluetooth node.
> - Drop hci_qca driver changes; clock is managed by the PMU driver.
> - Link to v1: https://patch.msgid.link/20260925-bt-wcn-clk-enable-v1-0-30bee88c4de4@oss.qualcomm.com
> ---
>  arch/arm64/boot/dts/qcom/shikra-cqm-som.dtsi | 2 ++
>  arch/arm64/boot/dts/qcom/shikra-iqs-som.dtsi | 2 ++
>  2 files changed, 4 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/shikra-cqm-som.dtsi b/arch/arm64/boot/dts/qcom/shikra-cqm-som.dtsi
> index 8ac42ff625a0..48af2bb87cf3 100644
> --- a/arch/arm64/boot/dts/qcom/shikra-cqm-som.dtsi
> +++ b/arch/arm64/boot/dts/qcom/shikra-cqm-som.dtsi
> @@ -45,6 +45,8 @@ wcn3988-pmu {
>  		vddrf-supply = <&pm4125_l10>;
>  		vddch0-supply = <&pm4125_l22>;
>  
> +		clocks = <&rpmcc RPM_SMD_RF_CLK2>;
> +
>  		regulators {
>  			vreg_pmu_io: ldo0 {
>  				regulator-name = "vreg_pmu_io";
> diff --git a/arch/arm64/boot/dts/qcom/shikra-iqs-som.dtsi b/arch/arm64/boot/dts/qcom/shikra-iqs-som.dtsi
> index 4ff97945274d..90aceaa6e1e3 100644
> --- a/arch/arm64/boot/dts/qcom/shikra-iqs-som.dtsi
> +++ b/arch/arm64/boot/dts/qcom/shikra-iqs-som.dtsi
> @@ -52,6 +52,8 @@ wcn3988-pmu {
>  		vddrf-supply = <&pm8150_l8>;
>  		vddch0-supply = <&vreg_wcn_3p3>;
>  
> +		clocks = <&rpmcc RPM_SMD_RF_CLK1>;
> +
>  		regulators {
>  			vreg_pmu_io: ldo0 {
>  				regulator-name = "vreg_pmu_io";
> 
> ---
> base-commit: 165768bb70265b5c38cf0b73fafd75be235f8b14
> change-id: 20260925-bt-wcn-clk-enable-9de068334aa1
> 
> Best regards,
> --  
> Yepuri Siddu <yepuri.siddu@oss.qualcomm.com>
>