ASoC: qcom: lpass-sc7180: Add system suspend/resume PM ops

Update lpass sc7180 platform driver with PM ops, such as
system supend and resume callbacks.
This update is required to disable clocks during supend and
avoid XO shutdown issue.

Signed-off-by: Srinivasa Rao Mandadapu <[email protected]>
Tested-by: Rahul Ajmeriya <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>

Author: Srinivasa Rao Mandadapu

sound/soc/qcom/lpass-sc7180.c

@@ -12,6 +12,7 @@
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
 #include <dt-bindings/sound/sc7180-lpass.h>
 #include <sound/pcm.h>
 #include <sound/soc.h>
@@ -159,10 +160,34 @@ static int sc7180_lpass_exit(struct platform_device *pdev)
 	struct lpass_data *drvdata = platform_get_drvdata(pdev);
 
 	clk_bulk_disable_unprepare(drvdata->num_clks, drvdata->clks);
+	return 0;
+}
+
+static int sc7180_lpass_dev_resume(struct device *dev)
+{
+	int ret = 0;
+	struct lpass_data *drvdata = dev_get_drvdata(dev);
 
+	ret = clk_bulk_prepare_enable(drvdata->num_clks, drvdata->clks);
+	if (ret) {
+		dev_err(dev, "sc7180 clk prepare and enable failed\n");
+		return ret;
+	}
+	return ret;
+}
+
+static int sc7180_lpass_dev_suspend(struct device *dev)
+{
+	struct lpass_data *drvdata = dev_get_drvdata(dev);
+
+	clk_bulk_disable_unprepare(drvdata->num_clks, drvdata->clks);
 	return 0;
 }
 
+static const struct dev_pm_ops sc7180_lpass_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(sc7180_lpass_dev_suspend, sc7180_lpass_dev_resume)
+};
+
 static struct lpass_variant sc7180_data = {
 	.i2sctrl_reg_base	= 0x1000,
 	.i2sctrl_reg_stride	= 0x1000,
@@ -296,6 +321,7 @@ static struct platform_driver sc7180_lpass_cpu_platform_driver = {
 	.driver = {
 		.name = "sc7180-lpass-cpu",
 		.of_match_table = of_match_ptr(sc7180_lpass_cpu_device_id),
+		.pm = &sc7180_lpass_pm_ops,
 	},
 	.probe = asoc_qcom_lpass_cpu_platform_probe,
 	.remove = asoc_qcom_lpass_cpu_platform_remove,