[PATCH 05/16] ASoC: SOF: use the sof_ipc_comp reserved bytes for extended data

[Kai Vehmanen]

From: Keyon Jie <yang.jie at linux.intel.com>

Use the 32bit reserved member of the struct sof_ipc_comp as the extended
data length, this will help to minimize the ABI change for adding new
extended data to the struct sof_ipc_comp, usually only minor ABI version
bump needed for every update with this new solution.

Signed-off-by: Keyon Jie <yang.jie at linux.intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan at linux.intel.com>
Signed-off-by: Kai Vehmanen <kai.vehmanen at linux.intel.com>
---
 include/sound/sof/topology.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/sound/sof/topology.h b/include/sound/sof/topology.h
index 796b6c8e851d..d12736e14b69 100644
--- a/include/sound/sof/topology.h
+++ b/include/sound/sof/topology.h
@@ -57,8 +57,8 @@ struct sof_ipc_comp {
 	uint32_t pipeline_id;
 	uint32_t core;
 
-	/* reserved for future use */
-	uint32_t reserved[1];
+	/* extended data length, 0 if no extended data */
+	uint32_t ext_data_length;
 } __packed;
 
 /*
-- 
2.27.0