Re: [PATCH v9 0/7] clk: qcom: Add common clkref support and migrate Glymur and Mahua

[Bjorn Andersson <andersson@kernel.org>]

On Mon, Jul 13, 2026 at 09:59:35PM -0700, Qiang Yu wrote:
> This series adds a common clkref_en implementation and converts glymur
> and mahua to use it, along with the related binding and DTS updates.
> 
> The PCIe clkref clocks on Glymur and Mahua gate the QREF block which
> provides reference clocks to the PCIe PHYs. QREF requires LDO supplies
> and a reference voltage from the refgen block to operate. The refgen
> block itself requires vdda-refgen_0p9 and vdda-refgen_1p2 LDOs to
> function.
> 
> Previously, these QREF votes were done in PHY drivers. In earlier
> discussion [1], the feedback was that this is the wrong ownership point:
> those supplies are for the QREF controlled by clkref registers, not for
> the PHY directly. Based on that feedback, this series keeps the
> regulator handling with the clkref control path.
> 
> Another reason for this series is reuse. clkref_en registers may live in
> different blocks across platforms (for example TCSR on Glymur, TLMM on
> SM8750 [2]), while the behavior is the same. The common helper lets each
> driver provide simple descriptors (name, offset, optional supplies) and
> reuse shared registration and runtime logic.
> 
> Glymur and Mahua share the same QREF TX/RPT/RX component naming but
> have different PCIe QREF topologies. Both are handled in tcsrcc-glymur.c
> via match_data to select the correct descriptor table per compatible.
> 
> [1] https://lore.kernel.org/lkml/aEBfV2M-ZqDF7aRz@hovoldconsulting.com/
> [2] https://lore.kernel.org/linux-arm-msm/20260202-topic-8750_tcsr-v1-0-cd7e6648c64f@oss.qualcomm.com/
> 
> Changes in v9:
>   - Add reviewed-by tags, no code change.
>   - Link to v8: https://lore.kernel.org/all/20260708-tcsr_qref_0708-v8-0-62c42b5fa269@oss.qualcomm.com/
> 
> Changes in v8:
>   - Define refs with __counted_by(num_refs) and make provider a single allocation
>   - Use mahua_tcsr_tx1_rpt012_rx2_regulators for PCIe6.
>   - Link to v7: https://lore.kernel.org/all/20260702-tcsr_qref_0702-v7-0-776f2811b7af@oss.qualcomm.com/
> 
> Changes in v7:
>   - Define compatible as an enum and add the per-compatible allOf/if/then block upfront for glymur. Reword commit msg for patch1
>   - Drop Krzysztof's Reviewed-by since the patch changed substantially from what he reviewed.
>   - Added a comment noting that on Mahua the REFGEN4 block is supplied by the vdda-refgen3-* regulators, and mentioned this in the commit message for patch2.
>   - Change the descriptor array to an array of pointers (const struct qcom_clk_ref_desc * const *). Skip unpopulated indices with if (!desc)
>   - Convert tcsr_cc_glymur_clk_descs[] and tcsr_cc_mahua_clk_descs[] to a pointer array.
>   - Add regulator lists for clkref_en on Mahua.
>   - Null-check device_get_match_data() result in probe.
>   - Add rx0 regulator in mahua tcsr node
>   - Squashed the former patch 8 (switch pcie5_phy ref clock to RPMH_CXO_CLK) into patch7, so Mahua PCIe probes at every commit.
>  - Link to v6: https://lore.kernel.org/all/20260621-tcsr_qref_0622-v6-0-c939c22ded0c@oss.qualcomm.com/
> 
> Changes in v6:
> - Split dt-bindings patch into two: one to move glymur-tcsr to its own
>   binding file, and one to add mahua support
> - Use regmap_set_bits()/regmap_clear_bits() instead of regmap_update_bits()
>   in clk-ref.c
> - Move clk_init_data from struct qcom_clk_ref to a stack variable in
>   qcom_clk_ref_register()
> - Add Co-developed-by/Reviewed-by tags from Konrad Dybcio
> - Add missing regulator supplies for EDP and USB clkref_en on glymur
> - Link to v5: https://patch.msgid.link/20260602-tcsr_qref_0527-v5-0-8ea174a59d7e@oss.qualcomm.com
> 
> Changes in v5:
> - Return 0 if regmap_read fail
> - Add a separate file for glymur-tcsr and mahua-tcsr
> - Link to v4: https://patch.msgid.link/20260527-tcsr_qref_0527-v4-0-ded83866c9d9@oss.qualcomm.com
> 
> Changes in v4:
> - Add mahua QREF support (binding, driver, DTS) to avoid dtb check error
> - Override pcie5_phy ref clock to RPMH_CXO_CLK on mahua since
>   TCSR_PCIE_1_CLKREF_EN is not available
> - Rename regulator arrays to topology-based names and merge duplicates
> - Remove else: false blocks from binding
> - Sort supply properties alphabetically in binding and DTS
> - Link to v3: https://lore.kernel.org/all/20260506-qref_vote_0506-v3-0-5ab71d2e6f16@oss.qualcomm.com/
> 
> Changes in v3:
> - Fix dtb check error: allOf:0: 'then' is a dependency of 'if'.
> - Link to v2: https://lore.kernel.org/all/20260420-vote_qref_in_tcsrcc-v2-0-589a23ae640a@oss.qualcomm.com/
> 
> Changes in v2:
> - RFC tag dropped
> - Changed back to additionalProperties: false
> - Moved all Glymur supply properties into top-level properties so they are explicitly defined.
> - Link to v1: https://lore.kernel.org/all/20260331-qref_vote-v1-0-3fd7fbf87864@oss.qualcomm.com/
> 
> Signed-off-by: Qiang Yu <qiang.yu@oss.qualcomm.com>
> ---
> Qiang Yu (7):
>       dt-bindings: clock: qcom: Move glymur TCSR to own binding
>       dt-bindings: clock: qcom,glymur-tcsr: Add mahua support
>       clk: qcom: Add generic clkref_en support
>       clk: qcom: tcsrcc-glymur: Add regulator supplies and migrate to clk_ref helper
>       clk: qcom: tcsrcc-glymur: Add Mahua QREF regulator support
>       arm64: dts: qcom: glymur: Add QREF regulator supplies to TCSR
>       arm64: dts: qcom: mahua: Add QREF regulator supplies to TCSR
> 
>  .../bindings/clock/qcom,glymur-tcsr.yaml           | 146 +++++++
>  .../bindings/clock/qcom,sm8550-tcsr.yaml           |   2 -
>  arch/arm64/boot/dts/qcom/glymur-crd.dts            |  20 +
>  arch/arm64/boot/dts/qcom/mahua-crd.dts             |  16 +
>  arch/arm64/boot/dts/qcom/mahua.dtsi                |  13 +
>  drivers/clk/qcom/Makefile                          |   1 +
>  drivers/clk/qcom/clk-ref.c                         | 205 +++++++++
>  drivers/clk/qcom/tcsrcc-glymur.c                   | 471 +++++++++++----------
>  include/linux/clk/qcom.h                           |  67 +++
>  9 files changed, 704 insertions(+), 237 deletions(-)
> ---
> base-commit: 3da905eb243cad56200f09bb7eaa060537aed0cc

I was hoping to apply this series, but I don't have this commit and
patch 4 ("migrate to clk_ref helper") doesn't apply to my tree.

What did you base this on? Why don't you test your changes on latest
mainline or linux-next?

Please rebase and test on a relevant branch.

Regards,
Bjorn

> change-id: 20260713-tcsr_qref_0714-0ee27bc42a07
> 
> Best regards,
> --  
> Qiang Yu <qiang.yu@oss.qualcomm.com>
>