summaryrefslogtreecommitdiffstats
path: root/drivers/soundwire/bus.c
diff options
context:
space:
mode:
authorVinod Koul <vinod.koul@intel.com>2017-12-14 11:19:35 +0530
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-12-19 11:14:57 +0100
commit56d4fe31af77f684bed62fb8201e6327e6ddf4e6 (patch)
tree1fd78ef27508083d887f39a069fdab120a403454 /drivers/soundwire/bus.c
parent7c3cd189b86d2fcf0579a7b61e8d9c6d5717a72e (diff)
downloadlinux-56d4fe31af77f684bed62fb8201e6327e6ddf4e6.tar.bz2
soundwire: Add MIPI DisCo property helpers
MIPI Discovery And Configuration (DisCo) Specification for SoundWire specifies properties to be implemented for SoundWire Masters and Slaves. The DisCo spec doesn't mandate these properties. However, SDW bus cannot work without knowing these values. The helper functions read the Master and Slave properties. Implementers of Master or Slave drivers can use any of the below three mechanisms: a) Use these APIs here as .read_prop() callback for Master and Slave b) Implement own methods and set those as .read_prop(), but invoke APIs in this file for generic read and override the values with platform specific data c) Implement ones own methods which do not use anything provided here Signed-off-by: Sanyog Kale <sanyog.r.kale@intel.com> Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com> Acked-By: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> Reviewed-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Vinod Koul <vinod.koul@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/soundwire/bus.c')
-rw-r--r--drivers/soundwire/bus.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/soundwire/bus.c b/drivers/soundwire/bus.c
index bc72c3d58bbf..9626bd1ab271 100644
--- a/drivers/soundwire/bus.c
+++ b/drivers/soundwire/bus.c
@@ -25,6 +25,14 @@ int sdw_add_bus_master(struct sdw_bus *bus)
mutex_init(&bus->bus_lock);
INIT_LIST_HEAD(&bus->slaves);
+ if (bus->ops->read_prop) {
+ ret = bus->ops->read_prop(bus);
+ if (ret < 0) {
+ dev_err(bus->dev, "Bus read properties failed:%d", ret);
+ return ret;
+ }
+ }
+
/*
* Device numbers in SoundWire are 0 thru 15. Enumeration device
* number (0), Broadcast device number (15), Group numbers (12 and