dma: ste_dma40: Parse flags property for new 'high priority channel' request

This is used for MSP (audio) devices which is about to be fully DT:ed.
Acked-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/dma/ste_dma40.c

@@ -2409,6 +2409,7 @@ static void d40_set_prio_realtime(struct d40_chan *d40c)
 #define D40_DT_FLAGS_DIR(flags)        ((flags >> 1) & 0x1)
 #define D40_DT_FLAGS_BIG_ENDIAN(flags) ((flags >> 2) & 0x1)
 #define D40_DT_FLAGS_FIXED_CHAN(flags) ((flags >> 3) & 0x1)
+#define D40_DT_FLAGS_HIGH_PRIO(flags)  ((flags >> 4) & 0x1)
 
 static struct dma_chan *d40_xlate(struct of_phandle_args *dma_spec,
 				  struct of_dma *ofdma)
@@ -2446,6 +2447,9 @@ static struct dma_chan *d40_xlate(struct of_phandle_args *dma_spec,
 		cfg.use_fixed_channel = true;
 	}
 
+	if (D40_DT_FLAGS_HIGH_PRIO(flags))
+		cfg.high_priority = true;
+
 	return dma_request_channel(cap, stedma40_filter, &cfg);
 }