linux-kernel - [PATCH v2 0/7] arm64: qcom-sm8[456]50: properly describe the PCIe Gen4x2 PHY AUX clock

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Message-Id: <20240322-topic-sm8x50-upstream-pcie-1-phy-aux-clk-v2-0-3ec0a966d52f@linaro.org>
Date: Fri, 22 Mar 2024 10:42:37 +0100
From: Neil Armstrong <neil.armstrong@...aro.org>
To: Bjorn Andersson <andersson@...nel.org>, 
 Konrad Dybcio <konrad.dybcio@...aro.org>, Vinod Koul <vkoul@...nel.org>, 
 Kishon Vijay Abraham I <kishon@...nel.org>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, 
 Conor Dooley <conor+dt@...nel.org>
Cc: linux-arm-msm@...r.kernel.org, linux-phy@...ts.infradead.org, 
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Neil Armstrong <neil.armstrong@...aro.org>, 
 Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>, 
 Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Subject: [PATCH v2 0/7] arm64: qcom-sm8[456]50: properly describe the PCIe
 Gen4x2 PHY AUX clock

The PCIe Gen4x2 PHY found in the SM8[456]50 SoCs have a second clock named
"PHY_AUX_CLK" which is an input of the Global Clock Controller (GCC) which
is muxed & gated then returned to the PHY as an input.

Document the clock IDs to select the PIPE clock or the AUX clock,
also enforce a second clock-output-names and a #clock-cells value of 1
for the PCIe Gen4x2 PHY found in the SM8[456]50 SoCs.

The PHY driver needs a light refactoring to support a second clock,
and finally the DT is changed to connect the PHY second clock to the
corresponding GCC input then drop the dummy fixed rate clock.

Signed-off-by: Neil Armstrong <neil.armstrong@...aro.org>
---
Changes in v2:
- Collected review tags
- Switched back to of_clk_add_hw_provider/devm_add_action_or_reset to maintain compatibility
- Tried to use generic of_clk_hw_onecell_get() but it requires to much boilerplate code
  and would still need a local qmp_pcie_clk_hw_get() to support the current #clock-cells=0
  when exposing 2 clocks, so it's simpler to just return the clocks in qmp_pcie_clk_hw_get()
- Link to v1: https://lore.kernel.org/r/20240319-topic-sm8x50-upstream-pcie-1-phy-aux-clk-v1-0-926d7a4ccd80@linaro.org

---
Neil Armstrong (7):
      dt-bindings: phy: qcom,sc8280xp-qmp-pcie-phy: document PHY AUX clock on SM8[456]50 SoCs
      phy: qcom: qmp-pcie: refactor clock register code
      phy: qcom: qmp-pcie: register second optional PHY AUX clock
      phy: qcom: qmp-pcie: register PHY AUX clock for SM8[456]50 4x2 PCIe PHY
      arm64: dts: qcom: sm8450: remove pcie-1-phy-aux-clk and add pcie1_phy pcie1_phy_aux_clk
      arm64: dts: qcom: sm8550: remove pcie-1-phy-aux-clk and add pcie1_phy pcie1_phy_aux_clk
      arm64: dts: qcom: sm8650: remove pcie-1-phy-aux-clk and add pcie1_phy pcie1_phy_aux_clk

 .../bindings/phy/qcom,sc8280xp-qmp-pcie-phy.yaml   | 27 +++++-
 arch/arm64/boot/dts/qcom/sm8450.dtsi               |  8 +-
 arch/arm64/boot/dts/qcom/sm8550-hdk.dts            |  4 -
 arch/arm64/boot/dts/qcom/sm8550-mtp.dts            |  4 -
 arch/arm64/boot/dts/qcom/sm8550-qrd.dts            |  8 --
 arch/arm64/boot/dts/qcom/sm8550.dtsi               | 13 +--
 arch/arm64/boot/dts/qcom/sm8650-mtp.dts            |  4 -
 arch/arm64/boot/dts/qcom/sm8650-qrd.dts            |  4 -
 arch/arm64/boot/dts/qcom/sm8650.dtsi               | 13 +--
 drivers/phy/qualcomm/phy-qcom-qmp-pcie.c           | 98 ++++++++++++++++++++--
 include/dt-bindings/phy/phy-qcom-qmp.h             |  4 +
 11 files changed, 133 insertions(+), 54 deletions(-)
---
base-commit: 2e93f143ca010a5013528e1cfdc895f024fe8c21
change-id: 20240319-topic-sm8x50-upstream-pcie-1-phy-aux-clk-4b35169707dd

Best regards,
-- 
Neil Armstrong <neil.armstrong@...aro.org>