ASoC: codecs: Simplify mclk initialization

Merge series from Cezary Rojewski <cezary.rojewski@intel.com>:

The patchset may not cover all codecs found in the codecs/ directory -
noticed a possible improvement and grepped for similar pattern across C
files found in the directory. Those addressed here seem pretty
straightforward.

Most of clk_xxx() functions do check if provided clk-pointer is
non-NULL. These do not check if the pointer is an error-pointer.
Providing such to a clk_xxx() results in a panic.

By utilizing _optional() variant of devm_clk_get() the driver code is
both simplified and more robust. There is no need to remember about
IS_ERR(clk) checks each time mclk is accessed.

sound/soc/codecs/da7213.c

@@ -2101,18 +2101,14 @@ static int da7213_probe(struct snd_soc_component *component)
 	pm_runtime_put_sync(component->dev);
 
 	/* Check if MCLK provided */
-	da7213->mclk = devm_clk_get(component->dev, "mclk");
-	if (IS_ERR(da7213->mclk)) {
-		if (PTR_ERR(da7213->mclk) != -ENOENT)
+	da7213->mclk = devm_clk_get_optional(component->dev, "mclk");
+	if (IS_ERR(da7213->mclk))
 		return PTR_ERR(da7213->mclk);
-		else
-			da7213->mclk = NULL;
-	} else {
+	if (da7213->mclk)
 		/* Do automatic PLL handling assuming fixed clock until
 		 * set_pll() has been called. This makes the codec usable
 		 * with the simple-audio-card driver. */
 		da7213->fixed_clk_auto_pll = true;
-	}
 
 	/* Default infinite tone gen, start/stop by Kcontrol */
 	snd_soc_component_write(component, DA7213_TONE_GEN_CYCLES, DA7213_BEEP_CYCLES_MASK);

sound/soc/codecs/nau8825.c

@@ -2836,16 +2836,12 @@ static int nau8825_read_device_properties(struct device *dev,
 	if (nau8825->adc_delay < 125 || nau8825->adc_delay > 500)
 		dev_warn(dev, "Please set the suitable delay time!\n");
 
-	nau8825->mclk = devm_clk_get(dev, "mclk");
-	if (PTR_ERR(nau8825->mclk) == -EPROBE_DEFER) {
-		return -EPROBE_DEFER;
-	} else if (PTR_ERR(nau8825->mclk) == -ENOENT) {
+	nau8825->mclk = devm_clk_get_optional(dev, "mclk");
+	if (IS_ERR(nau8825->mclk))
+		return PTR_ERR(nau8825->mclk);
+	if (!nau8825->mclk)
 		/* The MCLK is managed externally or not used at all */
-		nau8825->mclk = NULL;
 		dev_info(dev, "No 'mclk' clock found, assume MCLK is managed externally");
-	} else if (IS_ERR(nau8825->mclk)) {
-		return -EINVAL;
-	}
 
 	return 0;
 }

sound/soc/codecs/rt5514.c

@@ -1054,9 +1054,6 @@ static int rt5514_set_bias_level(struct snd_soc_component *component,
 
 	switch (level) {
 	case SND_SOC_BIAS_PREPARE:
-		if (IS_ERR(rt5514->mclk))
-			break;
-
 		if (snd_soc_component_get_bias_level(component) == SND_SOC_BIAS_ON) {
 			clk_disable_unprepare(rt5514->mclk);
 		} else {
@@ -1097,9 +1094,9 @@ static int rt5514_probe(struct snd_soc_component *component)
 	struct platform_device *pdev = container_of(component->dev,
 						   struct platform_device, dev);
 
-	rt5514->mclk = devm_clk_get(component->dev, "mclk");
-	if (PTR_ERR(rt5514->mclk) == -EPROBE_DEFER)
-		return -EPROBE_DEFER;
+	rt5514->mclk = devm_clk_get_optional(component->dev, "mclk");
+	if (IS_ERR(rt5514->mclk))
+		return PTR_ERR(rt5514->mclk);
 
 	if (rt5514->pdata.dsp_calib_clk_name) {
 		rt5514->dsp_calib_clk = devm_clk_get(&pdev->dev,

sound/soc/codecs/rt5616.c

@@ -1174,9 +1174,6 @@ static int rt5616_set_bias_level(struct snd_soc_component *component,
 		 * away from ON. Disable the clock in that case, otherwise
 		 * enable it.
 		 */
-		if (IS_ERR(rt5616->mclk))
-			break;
-
 		if (snd_soc_component_get_bias_level(component) == SND_SOC_BIAS_ON) {
 			clk_disable_unprepare(rt5616->mclk);
 		} else {
@@ -1225,9 +1222,9 @@ static int rt5616_probe(struct snd_soc_component *component)
 	struct rt5616_priv *rt5616 = snd_soc_component_get_drvdata(component);
 
 	/* Check if MCLK provided */
-	rt5616->mclk = devm_clk_get(component->dev, "mclk");
-	if (PTR_ERR(rt5616->mclk) == -EPROBE_DEFER)
-		return -EPROBE_DEFER;
+	rt5616->mclk = devm_clk_get_optional(component->dev, "mclk");
+	if (IS_ERR(rt5616->mclk))
+		return PTR_ERR(rt5616->mclk);
 
 	rt5616->component = component;
 

sound/soc/codecs/rt5640.c

@@ -1949,9 +1949,6 @@ static int rt5640_set_bias_level(struct snd_soc_component *component,
 		 * away from ON. Disable the clock in that case, otherwise
 		 * enable it.
 		 */
-		if (IS_ERR(rt5640->mclk))
-			break;
-
 		if (snd_soc_component_get_bias_level(component) == SND_SOC_BIAS_ON) {
 			clk_disable_unprepare(rt5640->mclk);
 		} else {
@@ -2661,9 +2658,9 @@ static int rt5640_probe(struct snd_soc_component *component)
 	u32 val;
 
 	/* Check if MCLK provided */
-	rt5640->mclk = devm_clk_get(component->dev, "mclk");
-	if (PTR_ERR(rt5640->mclk) == -EPROBE_DEFER)
-		return -EPROBE_DEFER;
+	rt5640->mclk = devm_clk_get_optional(component->dev, "mclk");
+	if (IS_ERR(rt5640->mclk))
+		return PTR_ERR(rt5640->mclk);
 
 	rt5640->component = component;
 

sound/soc/codecs/rt5660.c

@@ -1079,9 +1079,6 @@ static int rt5660_set_bias_level(struct snd_soc_component *component,
 		snd_soc_component_update_bits(component, RT5660_GEN_CTRL1,
 			RT5660_DIG_GATE_CTRL, RT5660_DIG_GATE_CTRL);
 
-		if (IS_ERR(rt5660->mclk))
-			break;
-
 		if (snd_soc_component_get_bias_level(component) == SND_SOC_BIAS_ON) {
 			clk_disable_unprepare(rt5660->mclk);
 		} else {
@@ -1277,9 +1274,9 @@ static int rt5660_i2c_probe(struct i2c_client *i2c)
 		return -ENOMEM;
 
 	/* Check if MCLK provided */
-	rt5660->mclk = devm_clk_get(&i2c->dev, "mclk");
-	if (PTR_ERR(rt5660->mclk) == -EPROBE_DEFER)
-		return -EPROBE_DEFER;
+	rt5660->mclk = devm_clk_get_optional(&i2c->dev, "mclk");
+	if (IS_ERR(rt5660->mclk))
+		return PTR_ERR(rt5660->mclk);
 
 	i2c_set_clientdata(i2c, rt5660);