soundwire: intel: move to auxiliary bus

Now that the auxiliary_bus exists, there's no reason to use platform
devices as children of a PCI device any longer.

This patch refactors the code by extending a basic auxiliary device
with Intel link-specific structures that need to be passed between
controller and link levels. This refactoring is much cleaner with no
need for cross-pointers between device and link structures.

Note that the auxiliary bus API has separate init and add steps, which
requires more attention in the error unwinding paths. The main loop
needs to deal with kfree() and auxiliary_device_uninit() for the
current iteration before jumping to the common label which releases
everything allocated in prior iterations.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Link: https://lore.kernel.org/r/20210511052132.28150-1-yung-chuan.liao@linux.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

1 files changed, 3 insertions, 3 deletions

diff --git a/include/linux/soundwire/sdw_intel.h b/include/linux/soundwire/sdw_intel.h
index 3a5446ac014a..1ebea7764011 100644
--- a/include/linux/soundwire/sdw_intel.h
+++ b/include/linux/soundwire/sdw_intel.h
@@ -58,7 +58,7 @@ struct sdw_intel_acpi_info {
 	u32 link_mask;
 };
 
-struct sdw_intel_link_res;
+struct sdw_intel_link_dev;
 
 /* Intel clock-stop/pm_runtime quirk definitions */
 
@@ -109,7 +109,7 @@ struct sdw_intel_slave_id {
  * 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
+ * @ldev: information for each link (controller-specific and kept
  * opaque here)
  * @ids: array of slave_id, representing Slaves exposed across all enabled
  * links
@@ -123,7 +123,7 @@ struct sdw_intel_ctx {
 	u32 link_mask;
 	int num_slaves;
 	acpi_handle handle;
-	struct sdw_intel_link_res *links;
+	struct sdw_intel_link_dev **ldev;
 	struct sdw_intel_slave_id *ids;
 	struct list_head link_list;
 	struct mutex shim_lock; /* lock for access to shared SHIM registers */