dmaengine: at_hdmac: add a few const qualifiers

This prepares of_device_id.data becoming const. Without this change
the following warning would occur:

	drivers/dma/at_hdmac.c: In function 'at_dma_get_driver_data':
	drivers/dma/at_hdmac.c:1228: warning: return discards qualifiers from pointer target type

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Cc: Nicolas Ferre <nicolas.ferre@atmel.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Vinod Koul <vinod.koul@intel.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Vinod Koul <vinod.koul@linux.intel.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/dma/at_hdmac.c b/drivers/dma/at_hdmac.c
index bb1601305d25..3934fcc4e00b 100644
--- a/drivers/dma/at_hdmac.c
+++ b/drivers/dma/at_hdmac.c
@@ -1216,7 +1216,7 @@ static const struct platform_device_id atdma_devtypes[] = {
         }
 };
 
-static inline struct at_dma_platform_data * __init at_dma_get_driver_data(
+static inline const struct at_dma_platform_data * __init at_dma_get_driver_data(
                                                 struct platform_device *pdev)
 {
         if (pdev->dev.of_node) {
@@ -1254,7 +1254,7 @@ static int __init at_dma_probe(struct platform_device *pdev)
         int                     irq;
         int                     err;
         int                     i;
-        struct at_dma_platform_data *plat_dat;
+        const struct at_dma_platform_data *plat_dat;
 
         /* setup platform data for each SoC */
         dma_cap_set(DMA_MEMCPY, at91sam9rl_config.cap_mask);