linux-kernel - [PATCH 04/15] clk: qcom: gcc-sm6375: Add runtime PM

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Message-Id: <20230717-topic-branch_aon_cleanup-v1-4-27784d27a4f4@linaro.org>
Date:   Mon, 17 Jul 2023 17:19:11 +0200
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Bjorn Andersson <andersson@...nel.org>,
        Andy Gross <agross@...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>,
        Conor Dooley <conor+dt@...nel.org>
Cc:     Marijn Suijten <marijn.suijten@...ainline.org>,
        linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        Konrad Dybcio <konrad.dybcio@...aro.org>
Subject: [PATCH 04/15] clk: qcom: gcc-sm6375: Add runtime PM

The GCC block on SM6375 is powered by the VDD_CX rail. We need to ensure
that it's enabled to prevent unwanted power collapse.

Enable runtime PM to keep the power flowing only when necessary.

Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
---
 drivers/clk/qcom/gcc-sm6375.c | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/drivers/clk/qcom/gcc-sm6375.c b/drivers/clk/qcom/gcc-sm6375.c
index 14dafea45ac9..4b2de545d3f8 100644
--- a/drivers/clk/qcom/gcc-sm6375.c
+++ b/drivers/clk/qcom/gcc-sm6375.c
@@ -7,6 +7,7 @@
 #include <linux/clk-provider.h>
 #include <linux/module.h>
 #include <linux/of_device.h>
+#include <linux/pm_runtime.h>
 #include <linux/regmap.h>
 
 #include <dt-bindings/clock/qcom,sm6375-gcc.h>
@@ -3784,9 +3785,19 @@ static int gcc_sm6375_probe(struct platform_device *pdev)
 	struct regmap *regmap;
 	int ret;
 
+	ret = devm_pm_runtime_enable(&pdev->dev);
+	if (ret)
+		return ret;
+
+	ret = pm_runtime_resume_and_get(&pdev->dev);
+	if (ret)
+		return ret;
+
 	regmap = qcom_cc_map(pdev, &gcc_sm6375_desc);
-	if (IS_ERR(regmap))
+	if (IS_ERR(regmap)) {
+		pm_runtime_put(&pdev->dev);
 		return PTR_ERR(regmap);
+	}
 
 	ret = qcom_cc_register_rcg_dfs(regmap, gcc_dfs_clocks, ARRAY_SIZE(gcc_dfs_clocks));
 	if (ret)
@@ -3817,7 +3828,10 @@ static int gcc_sm6375_probe(struct platform_device *pdev)
 	clk_lucid_pll_configure(&gpll8, regmap, &gpll8_config);
 	clk_zonda_pll_configure(&gpll9, regmap, &gpll9_config);
 
-	return qcom_cc_really_probe(pdev, &gcc_sm6375_desc, regmap);
+	ret = qcom_cc_really_probe(pdev, &gcc_sm6375_desc, regmap);
+	pm_runtime_put(&pdev->dev);
+
+	return ret;
 }
 
 static struct platform_driver gcc_sm6375_driver = {

-- 
2.41.0