Blackfin arch: add const to some function prototype and struct dma_channel

Signed-off-by: Michael McTernan <mmcternan@airvana.com>
Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>

2 files changed, 3 insertions, 3 deletions

diff --git a/arch/blackfin/include/asm/dma.h b/arch/blackfin/include/asm/dma.h
index 9befcbae00b9..3aa4dd3e5fe8 100644
--- a/arch/blackfin/include/asm/dma.h
+++ b/arch/blackfin/include/asm/dma.h
@@ -135,7 +135,7 @@ typedef irqreturn_t(*dma_interrupt_t) (int irq, void *dev_id);
 
 struct dma_channel {
         struct mutex dmalock;
-        char *device_id;
+        const char *device_id;
         enum dma_chan_status chan_status;
         struct dma_register *regs;
         struct dmasg *sg;               /* large mode descriptor */
@@ -191,7 +191,7 @@ void free_dma(unsigned int channel);
 int dma_channel_active(unsigned int channel); /* check if a channel is in use */
 void disable_dma(unsigned int channel);
 void enable_dma(unsigned int channel);
-int request_dma(unsigned int channel, char *device_id);
+int request_dma(unsigned int channel, const char *device_id);
 int set_dma_callback(unsigned int channel, dma_interrupt_t callback,
                      void *data);
 void dma_disable_irq(unsigned int channel);
diff --git a/arch/blackfin/kernel/bfin_dma_5xx.c b/arch/blackfin/kernel/bfin_dma_5xx.c
index 2625aa20a92c..22bce17bbb02 100644
--- a/arch/blackfin/kernel/bfin_dma_5xx.c
+++ b/arch/blackfin/kernel/bfin_dma_5xx.c
@@ -116,7 +116,7 @@ late_initcall(proc_dma_init);
 /*------------------------------------------------------------------------------
  *      Request the specific DMA channel from the system.
  *-----------------------------------------------------------------------------*/
-int request_dma(unsigned int channel, char *device_id)
+int request_dma(unsigned int channel, const char *device_id)
 {
         pr_debug("request_dma() : BEGIN \n");