ASoC: Add S3C64xx IIS CDCLK source selection

CDCLK can either be an output generated by the CPU, intended for use
as the CODEC master clock, or an input (probably from the CODEC)
providing a master clock for the IIS block.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

arch/arm/plat-s3c/include/plat/regs-s3c2412-iis.h

@@ -67,6 +67,8 @@
 #define S3C2412_IISMOD_BCLK_MASK	(3 << 1)
 #define S3C2412_IISMOD_8BIT		(1 << 0)
 
+#define S3C64XX_IISMOD_CDCLKCON		(1 << 12)
+
 #define S3C2412_IISPSR_PSREN		(1 << 15)
 
 #define S3C2412_IISFIC_TXFLUSH		(1 << 15)

sound/soc/s3c24xx/s3c64xx-i2s.c

@@ -99,6 +99,19 @@ static int s3c64xx_i2s_set_sysclk(struct snd_soc_dai *cpu_dai,
 		iismod |= S3C64XX_IISMOD_IMS_SYSMUX;
 		break;
 
+	case S3C64XX_CLKSRC_CDCLK:
+		switch (dir) {
+		case SND_SOC_CLOCK_IN:
+			iismod |= S3C64XX_IISMOD_CDCLKCON;
+			break;
+		case SND_SOC_CLOCK_OUT:
+			iismod &= ~S3C64XX_IISMOD_CDCLKCON;
+			break;
+		default:
+			return -EINVAL;
+		}
+		break;
+
 	default:
 		return -EINVAL;
 	}

sound/soc/s3c24xx/s3c64xx-i2s.h

@@ -25,6 +25,7 @@ struct clk;
 
 #define S3C64XX_CLKSRC_PCLK	(0)
 #define S3C64XX_CLKSRC_MUX	(1)
+#define S3C64XX_CLKSRC_CDCLK    (2)
 
 extern struct snd_soc_dai s3c64xx_i2s_dai[];