ASoC: samsung: i2s: Move registers cache to common driver data structure

There is no need to keep the PM suspend/resume register cache separate
for each DAI as those registers are common, move related i2s_dai data
structure to the driver's common data structure.  This will allow us
to simplify the code a little eventually and to make it easier to follow.
Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Acked-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/samsung/i2s.c

@@ -86,9 +86,6 @@ struct i2s_dai {
 	struct snd_dmaengine_dai_dma_data idma_playback;
 	dma_filter_fn filter;
 	u32	quirks;
-	u32	suspend_i2smod;
-	u32	suspend_i2scon;
-	u32	suspend_i2spsr;
 	const struct samsung_i2s_variant_regs *variant_regs;
 
 	spinlock_t *lock;
@@ -120,6 +117,11 @@ struct samsung_i2s_priv {
 	/* Rate of RCLK source clock */
 	unsigned long rclk_srcrate;
 
+	/* Cache of selected I2S registers for system suspend */
+	u32 suspend_i2smod;
+	u32 suspend_i2scon;
+	u32 suspend_i2spsr;
+
 	/* The clock provider's data */
 	struct clk *clk_table[3];
 	struct clk_onecell_data clk_data;
@@ -1205,9 +1207,9 @@ static int i2s_runtime_suspend(struct device *dev)
 	struct samsung_i2s_priv *priv = dev_get_drvdata(dev);
 	struct i2s_dai *i2s = samsung_i2s_get_pri_dai(dev);
 
-	i2s->suspend_i2smod = readl(i2s->addr + I2SMOD);
-	i2s->suspend_i2scon = readl(i2s->addr + I2SCON);
-	i2s->suspend_i2spsr = readl(i2s->addr + I2SPSR);
+	priv->suspend_i2smod = readl(i2s->addr + I2SMOD);
+	priv->suspend_i2scon = readl(i2s->addr + I2SCON);
+	priv->suspend_i2spsr = readl(i2s->addr + I2SPSR);
 
 	if (priv->op_clk)
 		clk_disable_unprepare(priv->op_clk);
@@ -1234,9 +1236,9 @@ static int i2s_runtime_resume(struct device *dev)
 		}
 	}
 
-	writel(i2s->suspend_i2scon, i2s->addr + I2SCON);
-	writel(i2s->suspend_i2smod, i2s->addr + I2SMOD);
-	writel(i2s->suspend_i2spsr, i2s->addr + I2SPSR);
+	writel(priv->suspend_i2scon, i2s->addr + I2SCON);
+	writel(priv->suspend_i2smod, i2s->addr + I2SMOD);
+	writel(priv->suspend_i2spsr, i2s->addr + I2SPSR);
 
 	return 0;
 }