linux-kernel - [PATCH v2 1/2] clk: qcom: camcc-sm6350: add pm

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Date:   Mon, 13 Feb 2023 14:08:06 +0100
From:   Luca Weiss <luca.weiss@...rphone.com>
To:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.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:     ~postmarketos/upstreaming@...ts.sr.ht, phone-devel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        Luca Weiss <luca@...tu.xyz>
Subject: [PATCH v2 1/2] clk: qcom: camcc-sm6350: add pm_runtime support

Make sure that we can enable and disable the power domains used for
camcc when the clocks are and aren't used.

Signed-off-by: Luca Weiss <luca@...tu.xyz>
---
 drivers/clk/qcom/camcc-sm6350.c | 29 ++++++++++++++++++++++++++++-
 1 file changed, 28 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/qcom/camcc-sm6350.c b/drivers/clk/qcom/camcc-sm6350.c
index acba9f99d960..dd65f3ef0857 100644
--- a/drivers/clk/qcom/camcc-sm6350.c
+++ b/drivers/clk/qcom/camcc-sm6350.c
@@ -7,6 +7,8 @@
 #include <linux/clk-provider.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
+#include <linux/pm_clock.h>
+#include <linux/pm_runtime.h>
 #include <linux/regmap.h>
 
 #include <dt-bindings/clock/qcom,sm6350-camcc.h>
@@ -1869,6 +1871,19 @@ MODULE_DEVICE_TABLE(of, camcc_sm6350_match_table);
 static int camcc_sm6350_probe(struct platform_device *pdev)
 {
 	struct regmap *regmap;
+	int ret;
+
+	ret = devm_pm_runtime_enable(&pdev->dev);
+	if (ret < 0)
+		return ret;
+
+	ret = devm_pm_clk_create(&pdev->dev);
+	if (ret < 0)
+		return ret;
+
+	ret = pm_runtime_get(&pdev->dev);
+	if (ret)
+		return ret;
 
 	regmap = qcom_cc_map(pdev, &camcc_sm6350_desc);
 	if (IS_ERR(regmap))
@@ -1879,14 +1894,26 @@ static int camcc_sm6350_probe(struct platform_device *pdev)
 	clk_agera_pll_configure(&camcc_pll2, regmap, &camcc_pll2_config);
 	clk_fabia_pll_configure(&camcc_pll3, regmap, &camcc_pll3_config);
 
-	return qcom_cc_really_probe(pdev, &camcc_sm6350_desc, regmap);
+	ret = qcom_cc_really_probe(pdev, &camcc_sm6350_desc, regmap);
+	pm_runtime_put(&pdev->dev);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "Failed to register CAM CC clocks\n");
+		return ret;
+	}
+
+	return 0;
 }
 
+static const struct dev_pm_ops camcc_pm_ops = {
+	SET_RUNTIME_PM_OPS(pm_clk_suspend, pm_clk_resume, NULL)
+};
+
 static struct platform_driver camcc_sm6350_driver = {
 	.probe = camcc_sm6350_probe,
 	.driver = {
 		.name = "sm6350-camcc",
 		.of_match_table = camcc_sm6350_match_table,
+		.pm = &camcc_pm_ops,
 	},
 };
 

-- 
2.39.1