[PATCH 4/7] soundwire: intel: add definitions for shim_mask

[Pierre-Louis Bossart]

We want to make sure SHIM register fields such as SYNCPRD are only
programmed once. Since we don't have a controller-level driver, we
need master-level drivers to collaborate: the registers will only be
programmed when the first link is powered-up.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart at linux.intel.com>
---
 drivers/soundwire/intel.h           | 2 ++
 include/linux/soundwire/sdw_intel.h | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/drivers/soundwire/intel.h b/drivers/soundwire/intel.h
index 568c84a80d79..cfc83120b8f9 100644
--- a/drivers/soundwire/intel.h
+++ b/drivers/soundwire/intel.h
@@ -16,6 +16,7 @@
  * @ops: Shim callback ops
  * @dev: device implementing hw_params and free callbacks
  * @shim_lock: mutex to handle access to shared SHIM registers
+ * @shim_mask: global pointer to check SHIM register initialization
  */
 struct sdw_intel_link_res {
 	struct platform_device *pdev;
@@ -27,6 +28,7 @@ struct sdw_intel_link_res {
 	const struct sdw_intel_ops *ops;
 	struct device *dev;
 	struct mutex *shim_lock; /* protect shared registers */
+	u32 *shim_mask;
 };
 
 #endif /* __SDW_INTEL_LOCAL_H */
diff --git a/include/linux/soundwire/sdw_intel.h b/include/linux/soundwire/sdw_intel.h
index 979b41b5dcb4..120ffddc03d2 100644
--- a/include/linux/soundwire/sdw_intel.h
+++ b/include/linux/soundwire/sdw_intel.h
@@ -115,6 +115,7 @@ struct sdw_intel_slave_id {
  * links
  * @link_list: list to handle interrupts across all links
  * @shim_lock: mutex to handle concurrent rmw access to shared SHIM registers.
+ * @shim_mask: flags to track initialization of SHIM shared registers
  */
 struct sdw_intel_ctx {
 	int count;
@@ -126,6 +127,7 @@ struct sdw_intel_ctx {
 	struct sdw_intel_slave_id *ids;
 	struct list_head link_list;
 	struct mutex shim_lock; /* lock for access to shared SHIM registers */
+	u32 shim_mask;
 };
 
 /**
-- 
2.20.1