soundwire: add definition for maximum number of ports

A Device may have at most 15 physical ports (DP0, DP1..DP14).

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Reviewed-by: Rander Wang <rander.wang@linux.intel.com>
Reviewed-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>
Link: https://lore.kernel.org/r/20200831134318.11443-3-yung-chuan.liao@linux.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

diff --git a/include/linux/soundwire/sdw.h b/include/linux/soundwire/sdw.h
index 76052f12c9f7140525ed1e7f47a0692f3bfca3c9..0aa4c6af75548bcdb7689d43419dece92281a062 100644 (file)
--- a/include/linux/soundwire/sdw.h
+++ b/include/linux/soundwire/sdw.h
@@ -38,7 +38,8 @@ struct sdw_slave;
 #define SDW_FRAME_CTRL_BITS            48
 #define SDW_MAX_DEVICES                        11
 
-#define SDW_VALID_PORT_RANGE(n)                ((n) <= 14 && (n) >= 1)
+#define SDW_MAX_PORTS                  15
+#define SDW_VALID_PORT_RANGE(n)                ((n) < SDW_MAX_PORTS && (n) >= 1)
 
 enum {
        SDW_PORT_DIRN_SINK = 0,