ASoC: codecs: va-macro: add runtime pm support

Add pm runtime support to VA Macro.
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20220224111718.6264-11-srinivas.kandagatla@linaro.orgSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/lpass-va-macro.c

@@ -9,6 +9,7 @@
 #include <linux/of_clk.h>
 #include <linux/of_platform.h>
 #include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
 #include <linux/regmap.h>
 #include <linux/regulator/consumer.h>
 #include <sound/soc.h>
@@ -1469,6 +1470,12 @@ static int va_macro_probe(struct platform_device *pdev)
 	if (ret)
 		goto err_clkout;
 
+	pm_runtime_set_autosuspend_delay(dev, 3000);
+	pm_runtime_use_autosuspend(dev);
+	pm_runtime_mark_last_busy(dev);
+	pm_runtime_set_active(dev);
+	pm_runtime_enable(dev);
+
 	return 0;
 
 err_clkout:
@@ -1492,6 +1499,39 @@ static int va_macro_remove(struct platform_device *pdev)
 	return 0;
 }
 
+static int __maybe_unused va_macro_runtime_suspend(struct device *dev)
+{
+	struct va_macro *va = dev_get_drvdata(dev);
+
+	regcache_cache_only(va->regmap, true);
+	regcache_mark_dirty(va->regmap);
+
+	clk_disable_unprepare(va->mclk);
+
+	return 0;
+}
+
+static int __maybe_unused va_macro_runtime_resume(struct device *dev)
+{
+	struct va_macro *va = dev_get_drvdata(dev);
+	int ret;
+
+	ret = clk_prepare_enable(va->mclk);
+	if (ret) {
+		dev_err(va->dev, "unable to prepare mclk\n");
+		return ret;
+	}
+
+	regcache_cache_only(va->regmap, false);
+	regcache_sync(va->regmap);
+	return 0;
+}
+
+
+static const struct dev_pm_ops va_macro_pm_ops = {
+	SET_RUNTIME_PM_OPS(va_macro_runtime_suspend, va_macro_runtime_resume, NULL)
+};
+
 static const struct of_device_id va_macro_dt_match[] = {
 	{ .compatible = "qcom,sc7280-lpass-va-macro" },
 	{ .compatible = "qcom,sm8250-lpass-va-macro" },
@@ -1504,6 +1544,7 @@ static struct platform_driver va_macro_driver = {
 		.name = "va_macro",
 		.of_match_table = va_macro_dt_match,
 		.suppress_bind_attrs = true,
+		.pm = &va_macro_pm_ops,
 	},
 	.probe = va_macro_probe,
 	.remove = va_macro_remove,