[PATCH v2] ASoC: qcom: lpass-sc7280: Add system suspend/resume PM ops

[Srinivasa Rao Mandadapu]

Update lpass sc7280 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 <quic_srivasam@xxxxxxxxxxx>
Tested-by: Rahul Ajmeriya <quic_rajmeriy@xxxxxxxxxxx>
---
Changes since v1:
    -- Add __maybe_unused flag for suspend/resume APIs.

 sound/soc/qcom/lpass-sc7280.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/sound/soc/qcom/lpass-sc7280.c b/sound/soc/qcom/lpass-sc7280.c
index 70c4df8..d43f480 100644
--- a/sound/soc/qcom/lpass-sc7280.c
+++ b/sound/soc/qcom/lpass-sc7280.c
@@ -232,10 +232,28 @@ static int sc7280_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 __maybe_unused sc7280_lpass_dev_resume(struct device *dev)
+{
+	struct lpass_data *drvdata = dev_get_drvdata(dev);
+
+	return clk_bulk_prepare_enable(drvdata->num_clks, drvdata->clks);
+}
 
+static int __maybe_unused sc7280_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 sc7280_lpass_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(sc7280_lpass_dev_suspend, sc7280_lpass_dev_resume)
+};
+
 static struct lpass_variant sc7280_data = {
 	.i2sctrl_reg_base		= 0x1000,
 	.i2sctrl_reg_stride		= 0x1000,
@@ -426,6 +444,7 @@ static struct platform_driver sc7280_lpass_cpu_platform_driver = {
 	.driver = {
 		.name = "sc7280-lpass-cpu",
 		.of_match_table = of_match_ptr(sc7280_lpass_cpu_device_id),
+		.pm = &sc7280_lpass_pm_ops,
 	},
 	.probe = asoc_qcom_lpass_cpu_platform_probe,
 	.remove = asoc_qcom_lpass_cpu_platform_remove,
-- 
2.7.4