ASoC: ti: davinci-mcasp: Add support for the OMAP4 version of McASP

There is a single McASP on OMAP4 (and OMAP5) which is configured to only
support DIT playback mode on a single serializer.

Add 0x200 offset to DAT port address as the TRM suggests it.
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Link: https://lore.kernel.org/r/20210705194249.2385-4-peter.ujfalusi@gmail.comSigned-off-by: Mark Brown <broonie@kernel.org>

include/linux/platform_data/davinci_asp.h

@@ -96,6 +96,7 @@ enum {
 	MCASP_VERSION_2,	/* DA8xx/OMAPL1x */
 	MCASP_VERSION_3,        /* TI81xx/AM33xx */
 	MCASP_VERSION_4,	/* DRA7xxx */
+	MCASP_VERSION_OMAP,	/* OMAP4/5 */
 };
 
 enum mcbsp_clk_input_pin {

sound/soc/ti/Kconfig

@@ -35,6 +35,7 @@ config SND_SOC_DAVINCI_MCASP
 	  various Texas Instruments SoCs like:
 	  - daVinci devices
 	  - Sitara line of SoCs (AM335x, AM438x, etc)
+	  - OMAP4
 	  - DRA7x devices
 	  - Keystone devices
 	  - K3 devices (am654, j721e)

sound/soc/ti/davinci-mcasp.c

@@ -1794,6 +1794,12 @@ static struct davinci_mcasp_pdata dra7_mcasp_pdata = {
 	.version = MCASP_VERSION_4,
 };
 
+static struct davinci_mcasp_pdata omap_mcasp_pdata = {
+	.tx_dma_offset = 0x200,
+	.rx_dma_offset = 0,
+	.version = MCASP_VERSION_OMAP,
+};
+
 static const struct of_device_id mcasp_dt_ids[] = {
 	{
 		.compatible = "ti,dm646x-mcasp-audio",
@@ -1811,6 +1817,10 @@ static const struct of_device_id mcasp_dt_ids[] = {
 		.compatible = "ti,dra7-mcasp-audio",
 		.data = &dra7_mcasp_pdata,
 	},
+	{
+		.compatible = "ti,omap4-mcasp-audio",
+		.data = &omap_mcasp_pdata,
+	},
 	{ /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, mcasp_dt_ids);
@@ -2350,10 +2360,17 @@ static int davinci_mcasp_probe(struct platform_device *pdev)
 
 	dma_data = &mcasp->dma_data[SNDRV_PCM_STREAM_PLAYBACK];
 	dma_data->filter_data = "tx";
-	if (dat)
+	if (dat) {
 		dma_data->addr = dat->start;
-	else
+		/*
+		 * According to the TRM there should be 0x200 offset added to
+		 * the DAT port address
+		 */
+		if (mcasp->version == MCASP_VERSION_OMAP)
+			dma_data->addr += davinci_mcasp_txdma_offset(mcasp->pdata);
+	} else {
 		dma_data->addr = mem->start + davinci_mcasp_txdma_offset(mcasp->pdata);
+	}
 
 
 	/* RX is not valid in DIT mode */
@@ -2418,7 +2435,10 @@ static int davinci_mcasp_probe(struct platform_device *pdev)
 		ret = edma_pcm_platform_register(&pdev->dev);
 		break;
 	case PCM_SDMA:
-		ret = sdma_pcm_platform_register(&pdev->dev, "tx", "rx");
+		if (mcasp->op_mode == DAVINCI_MCASP_IIS_MODE)
+			ret = sdma_pcm_platform_register(&pdev->dev, "tx", "rx");
+		else
+			ret = sdma_pcm_platform_register(&pdev->dev, "tx", NULL);
 		break;
 	case PCM_UDMA:
 		ret = udma_pcm_platform_register(&pdev->dev);