netdev - [PATCH 7/8] clk: qcom: gcc-sm8150: use runtime PM for the clock controller

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Date:   Thu, 27 Jan 2022 03:47:24 +0530
From:   Bhupesh Sharma <bhupesh.sharma@...aro.org>
To:     linux-arm-msm@...r.kernel.org
Cc:     bhupesh.sharma@...aro.org, bhupesh.linux@...il.com,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        robh+dt@...nel.org, agross@...nel.org, sboyd@...nel.org,
        tdas@...eaurora.org, mturquette@...libre.com,
        linux-clk@...r.kernel.org, bjorn.andersson@...aro.org,
        davem@...emloft.net, netdev@...r.kernel.org
Subject: [PATCH 7/8] clk: qcom: gcc-sm8150: use runtime PM for the clock controller

On sm8150 emac clk registers are powered up by the GDSC power
domain. Use runtime PM calls to make sure that required power domain is
powered on while we access clock controller's registers.

Cc: Stephen Boyd <sboyd@...nel.org>
Signed-off-by: Bhupesh Sharma <bhupesh.sharma@...aro.org>
---
 drivers/clk/qcom/gcc-sm8150.c | 27 +++++++++++++++++++++++++--
 1 file changed, 25 insertions(+), 2 deletions(-)

diff --git a/drivers/clk/qcom/gcc-sm8150.c b/drivers/clk/qcom/gcc-sm8150.c
index ada755ad55f7..2e71afed81fd 100644
--- a/drivers/clk/qcom/gcc-sm8150.c
+++ b/drivers/clk/qcom/gcc-sm8150.c
@@ -5,6 +5,7 @@
 #include <linux/bitops.h>
 #include <linux/err.h>
 #include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/of_device.h>
@@ -3792,19 +3793,41 @@ static const struct of_device_id gcc_sm8150_match_table[] = {
 };
 MODULE_DEVICE_TABLE(of, gcc_sm8150_match_table);
 
+static void gcc_sm8150_pm_runtime_disable(void *data)
+{
+	pm_runtime_disable(data);
+}
+
 static int gcc_sm8150_probe(struct platform_device *pdev)
 {
 	struct regmap *regmap;
+	int ret;
+
+	pm_runtime_enable(&pdev->dev);
+
+	ret = devm_add_action_or_reset(&pdev->dev, gcc_sm8150_pm_runtime_disable, &pdev->dev);
+	if (ret)
+		return ret;
+
+	ret = pm_runtime_resume_and_get(&pdev->dev);
+	if (ret)
+		return ret;
 
 	regmap = qcom_cc_map(pdev, &gcc_sm8150_desc);
-	if (IS_ERR(regmap))
+	if (IS_ERR(regmap)) {
+		pm_runtime_put(&pdev->dev);
 		return PTR_ERR(regmap);
+	}
 
 	/* Disable the GPLL0 active input to NPU and GPU via MISC registers */
 	regmap_update_bits(regmap, 0x4d110, 0x3, 0x3);
 	regmap_update_bits(regmap, 0x71028, 0x3, 0x3);
 
-	return qcom_cc_really_probe(pdev, &gcc_sm8150_desc, regmap);
+	ret = qcom_cc_really_probe(pdev, &gcc_sm8150_desc, regmap);
+
+	pm_runtime_put(&pdev->dev);
+
+	return ret;
 }
 
 static struct platform_driver gcc_sm8150_driver = {
-- 
2.34.1