linux-kernel - [PATCH V2 4/4] clk: qcom: videocc-sm8150: Add runtime PM support

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Date:   Sat, 18 Nov 2023 18:09:44 +0530
From:   Satya Priya Kakitapalli <quic_skakitap@...cinc.com>
To:     Andy Gross <agross@...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>,
        Conor Dooley <conor+dt@...nel.org>
CC:     <linux-arm-msm@...r.kernel.org>, <linux-clk@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
        "Satya Priya Kakitapalli" <quic_skakitap@...cinc.com>
Subject: [PATCH V2 4/4] clk: qcom: videocc-sm8150: Add runtime PM support

Add runtime PM support to ensure the supply rails are enabled
when necessary.

Signed-off-by: Satya Priya Kakitapalli <quic_skakitap@...cinc.com>
---
Changes since v1:
 - None.

 drivers/clk/qcom/videocc-sm8150.c | 20 ++++++++++++++++++--
 1 file changed, 18 insertions(+), 2 deletions(-)

diff --git a/drivers/clk/qcom/videocc-sm8150.c b/drivers/clk/qcom/videocc-sm8150.c
index 52a9a453a143..b57df5ff96c4 100644
--- a/drivers/clk/qcom/videocc-sm8150.c
+++ b/drivers/clk/qcom/videocc-sm8150.c
@@ -6,6 +6,7 @@
 #include <linux/clk-provider.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
 #include <linux/regmap.h>
 
 #include <dt-bindings/clock/qcom,videocc-sm8150.h>
@@ -240,17 +241,32 @@ MODULE_DEVICE_TABLE(of, video_cc_sm8150_match_table);
 static int video_cc_sm8150_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, &video_cc_sm8150_desc);
-	if (IS_ERR(regmap))
+	if (IS_ERR(regmap)) {
+		pm_runtime_put(&pdev->dev);
 		return PTR_ERR(regmap);
+	}
 
 	clk_trion_pll_configure(&video_pll0, regmap, &video_pll0_config);
 
 	/* Keep VIDEO_CC_XO_CLK ALWAYS-ON */
 	regmap_update_bits(regmap, 0x984, 0x1, 0x1);
 
-	return qcom_cc_really_probe(pdev, &video_cc_sm8150_desc, regmap);
+	ret = qcom_cc_really_probe(pdev, &video_cc_sm8150_desc, regmap);
+
+	pm_runtime_put(&pdev->dev);
+
+	return ret;
 }
 
 static struct platform_driver video_cc_sm8150_driver = {
-- 
2.25.1