[PATCH v6 4/8] spi: imx: defer spi initialization, if DMA engine is

From: Anton Bondarenko
Date: Tue Dec 08 2015 - 01:46:11 EST


If SPI device supports DMA mode, but DMA controller is not yet
available due to e.g. a delay in the corresponding kernel module
initialization, retry to initialize SPI driver later on instead of
falling back into PIO only mode.

Signed-off-by: Anton Bondarenko <anton.bondarenko.sama@xxxxxxxxx>
---
drivers/spi/spi-imx.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/drivers/spi/spi-imx.c b/drivers/spi/spi-imx.c
index c123060..d98c33c 100644
--- a/drivers/spi/spi-imx.c
+++ b/drivers/spi/spi-imx.c
@@ -1222,6 +1222,9 @@ static int spi_imx_probe(struct platform_device *pdev)
*/
if (is_imx51_ecspi(spi_imx)) {
ret = spi_imx_sdma_init(&pdev->dev, spi_imx, master, res);
+ if (ret == -EPROBE_DEFER)
+ goto out_clk_put;
+
if (ret < 0)
dev_err(&pdev->dev, "dma setup error %d, use pio\n",
ret);
--
2.6.3

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