[alsa-devel] [PATCH] soundwire: intel: report slave_ids for each link to SOF driver

[Pierre-Louis Bossart]

From: Bard Liao <yung-chuan.liao at linux.intel.com>

The existing link_mask flag is no longer sufficient to detect the
hardware and identify which topology file and a machine driver to load.

By reporting the slave_ids exposed in ACPI tables, the parent SOF
driver will be able to compare against a set of static configurations.

This patch only adds the interface change, the functionality is added
in future patches.

Signed-off-by: Bard Liao <yung-chuan.liao at linux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart at linux.intel.com>
---
 include/linux/soundwire/sdw_intel.h | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/include/linux/soundwire/sdw_intel.h b/include/linux/soundwire/sdw_intel.h
index 93b83bdf8035..979b41b5dcb4 100644
--- a/include/linux/soundwire/sdw_intel.h
+++ b/include/linux/soundwire/sdw_intel.h
@@ -5,6 +5,7 @@
 #define __SDW_INTEL_H
 
 #include <linux/irqreturn.h>
+#include <linux/soundwire/sdw.h>
 
 /**
  * struct sdw_intel_stream_params_data: configuration passed during
@@ -93,6 +94,11 @@ struct sdw_intel_link_res;
  */
 #define SDW_INTEL_CLK_STOP_BUS_RESET		BIT(3)
 
+struct sdw_intel_slave_id {
+	int link_id;
+	struct sdw_slave_id id;
+};
+
 /**
  * struct sdw_intel_ctx - context allocated by the controller
  * driver probe
@@ -101,9 +107,12 @@ struct sdw_intel_link_res;
  * hardware capabilities after all power dependencies are settled.
  * @link_mask: bit-wise mask listing SoundWire links reported by the
  * Controller
+ * @num_slaves: total number of devices exposed across all enabled links
  * @handle: ACPI parent handle
  * @links: information for each link (controller-specific and kept
  * opaque here)
+ * @ids: array of slave_id, representing Slaves exposed across all enabled
+ * links
  * @link_list: list to handle interrupts across all links
  * @shim_lock: mutex to handle concurrent rmw access to shared SHIM registers.
  */
@@ -111,8 +120,10 @@ struct sdw_intel_ctx {
 	int count;
 	void __iomem *mmio_base;
 	u32 link_mask;
+	int num_slaves;
 	acpi_handle handle;
 	struct sdw_intel_link_res *links;
+	struct sdw_intel_slave_id *ids;
 	struct list_head link_list;
 	struct mutex shim_lock; /* lock for access to shared SHIM registers */
 };
-- 
2.20.1