ASoC: pcm512x: Add support for more data formats

Currently, pcm512x driver supports only I2S data format.
This commit adds RJ, LJ, DSP_A and DSP_B as well.

I don't expect regression WRT existing sound cards, because:

* default value in corresponding register of pcm512x codec is 0 ==  I2S
* existing in-tree sound cards with pcm512x codec are configured for I2S
* i don't see how existing off-tree sound cards with pcm512x codec could be
  configured differently - it would not work
* tested explicitly, that there is no regression with Raspberry Pi +
  sound card `sound/soc/bcm/hifiberry_dacplus.c`
Signed-off-by: Kirill Marinushkin <kmarinushkin@birdec.com>
Cc: Mark Brown <broonie@kernel.org>
Cc: Takashi Iwai <tiwai@suse.com>
Cc: Liam Girdwood <lgirdwood@gmail.com>
Cc: Matthias Reichl <hias@horus.com>
Cc: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Cc: Peter Ujfalusi <peter.ujfalusi@ti.com>
Cc: alsa-devel@alsa-project.org
Cc: linux-kernel@vger.kernel.org
Reviewed-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Link: https://lore.kernel.org/r/20201115122306.18164-5-kmarinushkin@birdec.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/pcm512x.c

@@ -1335,6 +1335,8 @@ static int pcm512x_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
 {
 	struct snd_soc_component *component = dai->component;
 	struct pcm512x_priv *pcm512x = snd_soc_component_get_drvdata(component);
+	int afmt;
+	int offset = 0;
 	int clock_output;
 	int master_mode;
 	int ret;
@@ -1372,6 +1374,42 @@ static int pcm512x_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
 		return ret;
 	}
 
+	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
+	case SND_SOC_DAIFMT_I2S:
+		afmt = PCM512x_AFMT_I2S;
+		break;
+	case SND_SOC_DAIFMT_RIGHT_J:
+		afmt = PCM512x_AFMT_RTJ;
+		break;
+	case SND_SOC_DAIFMT_LEFT_J:
+		afmt = PCM512x_AFMT_LTJ;
+		break;
+	case SND_SOC_DAIFMT_DSP_A:
+		offset = 1;
+		fallthrough;
+	case SND_SOC_DAIFMT_DSP_B:
+		afmt = PCM512x_AFMT_DSP;
+		break;
+	default:
+		dev_err(component->dev, "unsupported DAI format: 0x%x\n",
+			pcm512x->fmt);
+		return -EINVAL;
+	}
+
+	ret = regmap_update_bits(pcm512x->regmap, PCM512x_I2S_1,
+				 PCM512x_AFMT, afmt);
+	if (ret != 0) {
+		dev_err(component->dev, "Failed to set data format: %d\n", ret);
+		return ret;
+	}
+
+	ret = regmap_update_bits(pcm512x->regmap, PCM512x_I2S_2,
+				 0xFF, offset);
+	if (ret != 0) {
+		dev_err(component->dev, "Failed to set data offset: %d\n", ret);
+		return ret;
+	}
+
 	pcm512x->fmt = fmt;
 
 	return 0;