ASoC: samsung: i2s: Let runtime PM operations to control op_clk too

This patch adds handling of parent operational clock to runtime PM
callbacks. This way it is ensured that when I2S module is in runtime
suspended state, all its parent clocks are disabled and unprepared.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/samsung/i2s.c

@@ -546,6 +546,7 @@ static int i2s_set_sysclk(struct snd_soc_dai *dai,
 
 			if (WARN_ON(IS_ERR(i2s->op_clk))) {
 				ret = PTR_ERR(i2s->op_clk);
+				i2s->op_clk = NULL;
 				goto err;
 			}
 
@@ -1121,6 +1122,8 @@ static int i2s_runtime_suspend(struct device *dev)
 	i2s->suspend_i2scon = readl(i2s->addr + I2SCON);
 	i2s->suspend_i2spsr = readl(i2s->addr + I2SPSR);
 
+	if (i2s->op_clk)
+		clk_disable_unprepare(i2s->op_clk);
 	clk_disable_unprepare(i2s->clk);
 
 	return 0;
@@ -1131,6 +1134,8 @@ static int i2s_runtime_resume(struct device *dev)
 	struct i2s_dai *i2s = dev_get_drvdata(dev);
 
 	clk_prepare_enable(i2s->clk);
+	if (i2s->op_clk)
+		clk_prepare_enable(i2s->op_clk);
 
 	writel(i2s->suspend_i2scon, i2s->addr + I2SCON);
 	writel(i2s->suspend_i2smod, i2s->addr + I2SMOD);