ASoC: fsl_spdif: Add support for 22.05 kHz sample rate

Add support for 22.05 kHz sample rate for TX.
Signed-off-by: Matus Gajdos <matuszpd@gmail.com>
Reviewed-by: Fabio Estevam <festevam@gmail.com>
Link: https://lore.kernel.org/r/20230719163154.19492-1-matuszpd@gmail.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/fsl/fsl_spdif.c

@@ -514,6 +514,10 @@ static int spdif_set_sample_rate(struct snd_pcm_substream *substream,
 	int ret;
 
 	switch (sample_rate) {
+	case 22050:
+		rate = SPDIF_TXRATE_22050;
+		csfs = IEC958_AES3_CON_FS_22050;
+		break;
 	case 32000:
 		rate = SPDIF_TXRATE_32000;
 		csfs = IEC958_AES3_CON_FS_32000;
@@ -1422,7 +1426,7 @@ static u32 fsl_spdif_txclk_caldiv(struct fsl_spdif_priv *spdif_priv,
 				struct clk *clk, u64 savesub,
 				enum spdif_txrate index, bool round)
 {
-	static const u32 rate[] = { 32000, 44100, 48000, 88200, 96000, 176400,
+	static const u32 rate[] = { 22050, 32000, 44100, 48000, 88200, 96000, 176400,
 				    192000, };
 	bool is_sysclk = clk_is_match(clk, spdif_priv->sysclk);
 	u64 rate_ideal, rate_actual, sub;
@@ -1483,7 +1487,7 @@ static u32 fsl_spdif_txclk_caldiv(struct fsl_spdif_priv *spdif_priv,
 static int fsl_spdif_probe_txclk(struct fsl_spdif_priv *spdif_priv,
 				enum spdif_txrate index)
 {
-	static const u32 rate[] = { 32000, 44100, 48000, 88200, 96000, 176400,
+	static const u32 rate[] = { 22050, 32000, 44100, 48000, 88200, 96000, 176400,
 				    192000, };
 	struct platform_device *pdev = spdif_priv->pdev;
 	struct device *dev = &pdev->dev;

sound/soc/fsl/fsl_spdif.h

@@ -175,7 +175,8 @@ enum spdif_gainsel {
 
 /* SPDIF tx rate */
 enum spdif_txrate {
-	SPDIF_TXRATE_32000 = 0,
+	SPDIF_TXRATE_22050 = 0,
+	SPDIF_TXRATE_32000,
 	SPDIF_TXRATE_44100,
 	SPDIF_TXRATE_48000,
 	SPDIF_TXRATE_88200,
@@ -191,7 +192,8 @@ enum spdif_txrate {
 #define SPDIF_QSUB_SIZE			(SPDIF_UBITS_SIZE / 8)
 
 
-#define FSL_SPDIF_RATES_PLAYBACK	(SNDRV_PCM_RATE_32000 |	\
+#define FSL_SPDIF_RATES_PLAYBACK	(SNDRV_PCM_RATE_22050 |	\
+					 SNDRV_PCM_RATE_32000 |	\
 					 SNDRV_PCM_RATE_44100 |	\
 					 SNDRV_PCM_RATE_48000 |	\
 					 SNDRV_PCM_RATE_88200 | \