linux-kernel - [PATCH RFT v2 00/14] SMD RPMCC sleep preparations

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Date:   Wed, 08 Mar 2023 22:35:16 +0100
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
Cc:     linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        devicetree@...r.kernel.org,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Shawn Guo <shawn.guo@...aro.org>,
        Taniya Das <quic_tdas@...cinc.com>
Subject: [PATCH RFT v2 00/14] SMD RPMCC sleep preparations

v1 -> v2:
- Use CLK_IS_CRITICAL instead of leaving a clk enable vote, expand macros
  to do so
- Fix the keepalive clocks for 8998 & 660 (CNoC -> PNoC, it was
  confusingly named cnoc_periph downstream)
- Introduce .determinte_rate to ensure we don't set keepalive clocks'
  rates below 19.2 MHz
- Add a (!conditional!) way to test the ultimate goal of all these changes
  by essentially enabling unused clk cleanup through a dt property (for
  legacy reasons)

v2 was tested on:

- MSM8996 Sony Kagura (can disable unused)
- MSM8998 Sony Maple (can disable unused with OOT icc)
- SM6375 Sony PDX225 (can disable unused with OOT icc)

v1: https://lore.kernel.org/r/20230303-topic-rpmcc_sleep-v1-0-d9cfaf9b27a7@linaro.org

This series brings support for a couple of things necessary for the full
system idle on SMD RPM SoCs, namely unused clk shutdown and keepalive
votes (permanent active votes that are required on certain clocks for the
platform to function).

Tested on MSM8996 and SM6375, does not seem to introduce any additional
regressions.

Keepalive clocks for other platforms were gathered by digging in old
downstream kernels, please give them a test.

Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
---
Konrad Dybcio (11):
      dt-bindings: clock: qcom,rpmcc: Add a way to enable unused clock cleanup
      clk: qcom: smd-rpm_ Make __DEFINE_CLK_SMD_RPM_BRANCH_PREFIX accept flags
      clk: qcom: smd-rpm: Make DEFINE_CLK_SMD_RPM_BRANCH_A accept flags
      clk: qcom: smd-rpm: Make BI_TCXO_AO critical
      clk: qcom: smd-rpm: Make __DEFINE_CLK_SMD_RPM_PREFIX accept flags
      clk: qcom: smd-rpm: Separate out a macro for defining an AO clock
      clk: qcom: smd-rpm: Add support for keepalive votes
      clk: qcom: smd-rpm: Introduce DEFINE_CLK_SMD_RPM_BUS_KEEPALIVE
      clk: qcom: smd-rpm: Hook up PCNoC_0 keep_alive
      clk: qcom: smd-rpm: Hook up CNoC_1 and SNoC_2 keep_alive
      arm64: dts: qcom: msm8996: Enable rpmcc unused clk disablement

Shawn Guo (3):
      clk: qcom: smd-rpm: Add .is_enabled hook
      clk: qcom: smd-rpm: Add .is_prepared hook
      clk: qcom: smd-rpm: Mark clock enabled in clk_smd_rpm_handoff()

 .../devicetree/bindings/clock/qcom,rpmcc.yaml      |   6 +
 arch/arm64/boot/dts/qcom/msm8996.dtsi              |   1 +
 drivers/clk/qcom/clk-smd-rpm.c                     | 133 +++++++++++++++------
 3 files changed, 106 insertions(+), 34 deletions(-)
---
base-commit: fc31900c948610e7b5c2f15fb7795832c8325327
change-id: 20230303-topic-rpmcc_sleep-d67aad9f3012

Best regards,
-- 
Konrad Dybcio <konrad.dybcio@...aro.org>