ASoC: pcm3168a: add I2S/Left_J TDM support

pcm3168a is supporting TDM on I2S/Left_J, but there is no
settings for it. This patch add it.
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/pcm3168a.c

@@ -33,6 +33,8 @@
 #define PCM3168A_FMT_RIGHT_J_16		0x3
 #define PCM3168A_FMT_DSP_A		0x4
 #define PCM3168A_FMT_DSP_B		0x5
+#define PCM3168A_FMT_I2S_TDM		0x6
+#define PCM3168A_FMT_LEFT_J_TDM		0x7
 #define PCM3168A_FMT_DSP_MASK		0x4
 
 #define PCM3168A_NUM_SUPPLIES 6
@@ -401,9 +403,11 @@ static int pcm3168a_hw_params(struct snd_pcm_substream *substream,
 	bool tx, master_mode;
 	u32 val, mask, shift, reg;
 	unsigned int rate, fmt, ratio, max_ratio;
+	unsigned int chan;
 	int i, min_frame_size;
 
 	rate = params_rate(params);
+	chan = params_channels(params);
 
 	ratio = pcm3168a->sysclk / rate;
 
@@ -456,6 +460,21 @@ static int pcm3168a_hw_params(struct snd_pcm_substream *substream,
 		return -EINVAL;
 	}
 
+	/* for TDM */
+	if (chan > 2) {
+		switch (fmt) {
+		case PCM3168A_FMT_I2S:
+			fmt = PCM3168A_FMT_I2S_TDM;
+			break;
+		case PCM3168A_FMT_LEFT_J:
+			fmt = PCM3168A_FMT_LEFT_J_TDM;
+			break;
+		default:
+			dev_err(component->dev, "TDM is supported under I2S/Left_J only\n");
+			return -EINVAL;
+		}
+	}
+
 	if (master_mode)
 		val = ((i + 1) << shift);
 	else