[PATCH 6/7] clk: qcom: gcc-sc8180x: Add runtime PM

[Val Packett <val@packett.cool>]

The GCC block on SC8180X is powered by the 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: Val Packett <val@packett.cool>
---
 drivers/clk/qcom/gcc-sc8180x.c | 28 +++++++++++++++++++++++++---
 1 file changed, 25 insertions(+), 3 deletions(-)

diff --git a/drivers/clk/qcom/gcc-sc8180x.c b/drivers/clk/qcom/gcc-sc8180x.c
index 365943cd5278..073fb1e2b302 100644
--- a/drivers/clk/qcom/gcc-sc8180x.c
+++ b/drivers/clk/qcom/gcc-sc8180x.c
@@ -9,6 +9,7 @@
 #include <linux/err.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
+#include <linux/pm_runtime.h>
 #include <linux/of.h>
 #include <linux/platform_device.h>
 #include <linux/regmap.h>
@@ -4676,9 +4677,19 @@ static int gcc_sc8180x_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_sc8180x_desc);
-	if (IS_ERR(regmap))
+	if (IS_ERR(regmap)) {
+		pm_runtime_put(&pdev->dev);
 		return PTR_ERR(regmap);
+	}
 
 	/* Keep some clocks always-on */
 	qcom_branch_set_clk_en(regmap, 0xb004); /* GCC_VIDEO_AHB_CLK */
@@ -4699,9 +4710,20 @@ static int gcc_sc8180x_probe(struct platform_device *pdev)
 	ret = qcom_cc_register_rcg_dfs(regmap, gcc_dfs_clocks,
 					ARRAY_SIZE(gcc_dfs_clocks));
 	if (ret)
-		return ret;
+		goto err_put_rpm;
 
-	return qcom_cc_really_probe(&pdev->dev, &gcc_sc8180x_desc, regmap);
+	ret = qcom_cc_really_probe(&pdev->dev, &gcc_sc8180x_desc, regmap);
+	if (ret)
+		goto err_put_rpm;
+
+	pm_runtime_put(&pdev->dev);
+
+	return 0;
+
+err_put_rpm:
+	pm_runtime_put_sync(&pdev->dev);
+
+	return ret;
 }
 
 static struct platform_driver gcc_sc8180x_driver = {
-- 
2.52.0