ASoC: codecs: ad193x: Add support to disable on-chip PLL

The on-chip PLL can be disabled if on the MCLKI pin we have an external
clock at 512 x fs. This clock can be used as direct internal clock for
ADCs or DACs.
To support this, we add an extra clock id that can be configured
using the set_sysclk() callback.

Signed-off-by: Codrin Ciubotariu <codrin.ciubotariu@microchip.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/ad193x.h

@@ -31,6 +31,11 @@ int ad193x_probe(struct device *dev, struct regmap *regmap,
 #define AD193X_PLL_INPUT_512    (2 << 1)
 #define AD193X_PLL_INPUT_768    (3 << 1)
 #define AD193X_PLL_CLK_CTRL1    0x01
+#define AD193X_PLL_SRC_MASK	0x03
+#define AD193X_PLL_DAC_SRC_PLL  0
+#define AD193X_PLL_DAC_SRC_MCLK 1
+#define AD193X_PLL_CLK_SRC_PLL  (0 << 1)
+#define AD193X_PLL_CLK_SRC_MCLK	(1 << 1)
 #define AD193X_DAC_CTRL0        0x02
 #define AD193X_DAC_POWERDOWN           0x01
 #define AD193X_DAC_SERFMT_MASK		0xC0
@@ -96,4 +101,7 @@ int ad193x_probe(struct device *dev, struct regmap *regmap,
 
 #define AD193X_NUM_REGS          17
 
+#define AD193X_SYSCLK_PLL	0
+#define AD193X_SYSCLK_MCLK	1
+
 #endif