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[83.9.29.16]) by smtp.gmail.com with ESMTPSA id u7-20020ac243c7000000b004dc4d26c324sm2467479lfl.143.2023.03.08.13.35.36 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 08 Mar 2023 13:35:37 -0800 (PST) From: Konrad Dybcio Date: Wed, 08 Mar 2023 22:35:17 +0100 Subject: [PATCH RFT v2 01/14] dt-bindings: clock: qcom,rpmcc: Add a way to enable unused clock cleanup MIME-Version: 1.0 Message-Id: <20230303-topic-rpmcc_sleep-v2-1-ae80a325fe94@linaro.org> References: <20230303-topic-rpmcc_sleep-v2-0-ae80a325fe94@linaro.org> In-Reply-To: <20230303-topic-rpmcc_sleep-v2-0-ae80a325fe94@linaro.org> To: Andy Gross , Bjorn Andersson , Michael Turquette , Stephen Boyd , Rob Herring , Krzysztof Kozlowski Cc: linux-arm-msm@vger.kernel.org, linux-clk@vger.kernel.org, linux-kernel@vger.kernel.org, Krzysztof Kozlowski , devicetree@vger.kernel.org, Konrad Dybcio X-Mailer: b4 0.12.1 X-Developer-Signature: v=1; a=ed25519-sha256; t=1678311334; l=2006; i=konrad.dybcio@linaro.org; s=20230215; h=from:subject:message-id; bh=kU+or0SIwjfCFe3CHtYMpTgzGECGUtYX8Fz74pRBjmw=; b=xakONkb1YLP0DXpf6jbByNh8PngvZtgp8nUR3XoamblbthS/l/94cTLlNZLqyAgOaLmx+zNacVua CppU+tiMDl4K7Y31exizgRwrFp/ZEBt95LxBUjQfHTTMDa5jS9yo X-Developer-Key: i=konrad.dybcio@linaro.org; a=ed25519; pk=iclgkYvtl2w05SSXO5EjjSYlhFKsJ+5OSZBjOkQuEms= Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org Disabling RPMCC clocks can be a bit touchy. If we can't guarantee all (or at least most) of the oneline peripherals ask the interconnect framework to keep their buses online and guarantee enough bandwidth, we're relying on bootloader defaults to keep the said buses alive through RPM requests and rate setting on RPM clocks. Without that in place, the RPM clocks are never enabled in the CCF, which qualifies them to be cleaned up, since - as far as Linux is concerned - nobody's using them and they're just wasting power. Doing so will end tragically, as within miliseconds we'll get *some* access attempt on an unlocked bus which will cause a platform crash. On the other hand, if we want to save power and put well-supported platforms to sleep, we should be shutting off at least some of these clocks (this time with a clear distinction of which ones are *actually* not in use, coming from the interconnect driver). To differentiate between these two cases while not breaking older DTs, introduce an opt-in property to correctly mark RPM clocks as enabled after handoff (the initial max freq vote) and hence qualify them for the common unused clock cleanup. Signed-off-by: Konrad Dybcio --- Documentation/devicetree/bindings/clock/qcom,rpmcc.yaml | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/Documentation/devicetree/bindings/clock/qcom,rpmcc.yaml b/Documentation/devicetree/bindings/clock/qcom,rpmcc.yaml index 2a95bf8664f9..386153f61971 100644 --- a/Documentation/devicetree/bindings/clock/qcom,rpmcc.yaml +++ b/Documentation/devicetree/bindings/clock/qcom,rpmcc.yaml @@ -58,6 +58,12 @@ properties: minItems: 1 maxItems: 2 + qcom,clk-disable-unused: + type: boolean + description: + Indicates whether unused RPM clocks can be shut down with the common + unused clock cleanup. Requires a functional interconnect driver. + required: - compatible - '#clock-cells'