mmc: omap_hsmmc: use platform_get_resource_byname for tx/rx DMA channels

Git rid of hardcoded tx/rx DMA channels based on pdev->id
and use platform_get_resource_byname() to retrieve them
instead.
Signed-off-by: Balaji T K <balajitk@ti.com>
Signed-off-by: Rajendra Nayak <rnayak@ti.com>
Tested-by: Venkatraman S <svenkatr@ti.com>
Signed-off-by: Chris Ball <cjb@laptop.org>

drivers/mmc/host/omap_hsmmc.c

@@ -1981,32 +1981,19 @@ static int __init omap_hsmmc_probe(struct platform_device *pdev)
 
 	omap_hsmmc_conf_bus_power(host);
 
-	/* Select DMA lines */
-	switch (host->id) {
-	case OMAP_MMC1_DEVID:
-		host->dma_line_tx = OMAP24XX_DMA_MMC1_TX;
-		host->dma_line_rx = OMAP24XX_DMA_MMC1_RX;
-		break;
-	case OMAP_MMC2_DEVID:
-		host->dma_line_tx = OMAP24XX_DMA_MMC2_TX;
-		host->dma_line_rx = OMAP24XX_DMA_MMC2_RX;
-		break;
-	case OMAP_MMC3_DEVID:
-		host->dma_line_tx = OMAP34XX_DMA_MMC3_TX;
-		host->dma_line_rx = OMAP34XX_DMA_MMC3_RX;
-		break;
-	case OMAP_MMC4_DEVID:
-		host->dma_line_tx = OMAP44XX_DMA_MMC4_TX;
-		host->dma_line_rx = OMAP44XX_DMA_MMC4_RX;
-		break;
-	case OMAP_MMC5_DEVID:
-		host->dma_line_tx = OMAP44XX_DMA_MMC5_TX;
-		host->dma_line_rx = OMAP44XX_DMA_MMC5_RX;
-		break;
-	default:
-		dev_err(mmc_dev(host->mmc), "Invalid MMC id\n");
+	res = platform_get_resource_byname(pdev, IORESOURCE_DMA, "tx");
+	if (!res) {
+		dev_err(mmc_dev(host->mmc), "cannot get DMA TX channel\n");
+		goto err_irq;
+	}
+	host->dma_line_tx = res->start;
+
+	res = platform_get_resource_byname(pdev, IORESOURCE_DMA, "rx");
+	if (!res) {
+		dev_err(mmc_dev(host->mmc), "cannot get DMA RX channel\n");
 		goto err_irq;
 	}
+	host->dma_line_rx = res->start;
 
 	/* Request IRQ for MMC operations */
 	ret = request_irq(host->irq, omap_hsmmc_irq, 0,