spi: spi-fsl-dspi: Use dma_request_chan() instead dma_request_slave_channel()

dma_request_slave_channel() is a wrapper on top of dma_request_chan()
eating up the error code.

By using dma_request_chan() directly the driver can support deferred
probing against DMA.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Link: https://lore.kernel.org/r/20191212135550.4634-8-peter.ujfalusi@ti.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/drivers/spi/spi-fsl-dspi.c b/drivers/spi/spi-fsl-dspi.c
index 442cff7..52ccd83 100644 (file)
--- a/drivers/spi/spi-fsl-dspi.c
+++ b/drivers/spi/spi-fsl-dspi.c
@@ -395,17 +395,17 @@ static int dspi_request_dma(struct fsl_dspi *dspi, phys_addr_t phy_addr)
        if (!dma)
                return -ENOMEM;
 
-       dma->chan_rx = dma_request_slave_channel(dev, "rx");
-       if (!dma->chan_rx) {
+       dma->chan_rx = dma_request_chan(dev, "rx");
+       if (IS_ERR(dma->chan_rx)) {
                dev_err(dev, "rx dma channel not available\n");
-               ret = -ENODEV;
+               ret = PTR_ERR(dma->chan_rx);
                return ret;
        }
 
-       dma->chan_tx = dma_request_slave_channel(dev, "tx");
-       if (!dma->chan_tx) {
+       dma->chan_tx = dma_request_chan(dev, "tx");
+       if (IS_ERR(dma->chan_tx)) {
                dev_err(dev, "tx dma channel not available\n");
-               ret = -ENODEV;
+               ret = PTR_ERR(dma->chan_tx);
                goto err_tx_channel;
        }