linux-kernel - [PATCH v5 0/3] arm64: qcom-sm8[456]50: properly describe the PCIe Gen4x2 PHY AUX clock

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Date: Thu, 02 May 2024 10:00:35 +0200
From: Neil Armstrong <neil.armstrong@...aro.org>
To: Bjorn Andersson <andersson@...nel.org>, 
 Konrad Dybcio <konrad.dybcio@...aro.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, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Neil Armstrong <neil.armstrong@...aro.org>, 
 Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Subject: [PATCH v5 0/3] 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.

To: Bjorn Andersson <andersson@...nel.org>
To: Konrad Dybcio <konrad.dybcio@...aro.org>
To: Rob Herring <robh@...nel.org>
To: Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
To: Conor Dooley <conor+dt@...nel.org>
Cc: linux-arm-msm@...r.kernel.org
Cc: devicetree@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
Signed-off-by: Neil Armstrong <neil.armstrong@...aro.org>

Changes in v5:
- Reworked commit message to include more reasoning and details about the changes
- Link to v4: https://lore.kernel.org/r/20240422-topic-sm8x50-upstream-pcie-1-phy-aux-clk-v4-0-868b15a17a45@linaro.org

Changes in v4:
- Fixed dtbs check error on sm8550-qrd.dtb after rebase on -next
- Link to v3: https://lore.kernel.org/r/20240422-topic-sm8x50-upstream-pcie-1-phy-aux-clk-v3-0-799475a27cce@linaro.org

Changes in v3:
- Rebased on linux-next, applies now cleanly
- Link to v2: https://lore.kernel.org/r/20240322-topic-sm8x50-upstream-pcie-1-phy-aux-clk-v2-0-3ec0a966d52f@linaro.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 (3):
      arm64: dts: qcom: sm8450: correct pcie1 phy clocks inputs to gcc
      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

 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 | 19 -------------------
 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 ++++---------
 8 files changed, 12 insertions(+), 57 deletions(-)
---
base-commit: 1d0a6cdb7d77a14da03246bb6f10a489ad49af41
change-id: 20240319-topic-sm8x50-upstream-pcie-1-phy-aux-clk-4b35169707dd

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