spi: omap2-mcspi: convert to dma_request_slave_channel_compat()

Convert dmaengine channel requests to use
dma_request_slave_channel_compat(). This supports the DT case of
platforms requiring channel selection from either the OMAP DMA or
the EDMA engine. AM33xx only boots from DT and is the only user
implementing EDMA so in the !DT case we can default to the OMAP DMA
filter.

Signed-off-by: Matt Porter <mporter@ti.com>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Joel A Fernandes <joelagnel@ti.com>
Signed-off-by: Sourav Poddar <sourav.poddar@ti.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

diff --git a/drivers/spi/spi-omap2-mcspi.c b/drivers/spi/spi-omap2-mcspi.c
index 6802806d1f18628486b0206aeb1a0aad5139c373..bb9afc3f043be1b6da862585868a9654d81eec5a 100644 (file)
--- a/drivers/spi/spi-omap2-mcspi.c
+++ b/drivers/spi/spi-omap2-mcspi.c
@@ -109,6 +109,9 @@ struct omap2_mcspi_dma {
 
        struct completion dma_tx_completion;
        struct completion dma_rx_completion;
+
+       char dma_rx_ch_name[14];
+       char dma_tx_ch_name[14];
 };
 
 /* use PIO for small transfers, avoiding DMA setup/teardown overhead and
@@ -936,12 +939,20 @@ static int omap2_mcspi_request_dma(struct spi_device *spi)
        dma_cap_zero(mask);
        dma_cap_set(DMA_SLAVE, mask);
        sig = mcspi_dma->dma_rx_sync_dev;
-       mcspi_dma->dma_rx = dma_request_channel(mask, omap_dma_filter_fn, &sig);
+
+       mcspi_dma->dma_rx =
+               dma_request_slave_channel_compat(mask, omap_dma_filter_fn,
+                                                &sig, &master->dev,
+                                                mcspi_dma->dma_rx_ch_name);
        if (!mcspi_dma->dma_rx)
                goto no_dma;
 
        sig = mcspi_dma->dma_tx_sync_dev;
-       mcspi_dma->dma_tx = dma_request_channel(mask, omap_dma_filter_fn, &sig);
+       mcspi_dma->dma_tx =
+               dma_request_slave_channel_compat(mask, omap_dma_filter_fn,
+                                                &sig, &master->dev,
+                                                mcspi_dma->dma_tx_ch_name);
+
        if (!mcspi_dma->dma_tx) {
                dma_release_channel(mcspi_dma->dma_rx);
                mcspi_dma->dma_rx = NULL;
@@ -1374,29 +1385,42 @@ static int omap2_mcspi_probe(struct platform_device *pdev)
                goto free_master;
 
        for (i = 0; i < master->num_chipselect; i++) {
-               char dma_ch_name[14];
+               char *dma_rx_ch_name = mcspi->dma_channels[i].dma_rx_ch_name;
+               char *dma_tx_ch_name = mcspi->dma_channels[i].dma_tx_ch_name;
                struct resource *dma_res;
 
-               sprintf(dma_ch_name, "rx%d", i);
-               dma_res = platform_get_resource_byname(pdev, IORESOURCE_DMA,
-                               dma_ch_name);
-               if (!dma_res) {
-                       dev_dbg(&pdev->dev, "cannot get DMA RX channel\n");
-                       status = -ENODEV;
-                       break;
-               }
+               sprintf(dma_rx_ch_name, "rx%d", i);
+               if (!pdev->dev.of_node) {
+                       dma_res =
+                               platform_get_resource_byname(pdev,
+                                                            IORESOURCE_DMA,
+                                                            dma_rx_ch_name);
+                       if (!dma_res) {
+                               dev_dbg(&pdev->dev,
+                                       "cannot get DMA RX channel\n");
+                               status = -ENODEV;
+                               break;
+                       }
 
-               mcspi->dma_channels[i].dma_rx_sync_dev = dma_res->start;
-               sprintf(dma_ch_name, "tx%d", i);
-               dma_res = platform_get_resource_byname(pdev, IORESOURCE_DMA,
-                               dma_ch_name);
-               if (!dma_res) {
-                       dev_dbg(&pdev->dev, "cannot get DMA TX channel\n");
-                       status = -ENODEV;
-                       break;
+                       mcspi->dma_channels[i].dma_rx_sync_dev =
+                               dma_res->start;
                }
+               sprintf(dma_tx_ch_name, "tx%d", i);
+               if (!pdev->dev.of_node) {
+                       dma_res =
+                               platform_get_resource_byname(pdev,
+                                                            IORESOURCE_DMA,
+                                                            dma_tx_ch_name);
+                       if (!dma_res) {
+                               dev_dbg(&pdev->dev,
+                                       "cannot get DMA TX channel\n");
+                               status = -ENODEV;
+                               break;
+                       }
 
-               mcspi->dma_channels[i].dma_tx_sync_dev = dma_res->start;
+                       mcspi->dma_channels[i].dma_tx_sync_dev =
+                               dma_res->start;
+               }
        }
 
        if (status < 0)