diff options
| author | Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> | 2022-08-23 07:50:03 +0300 |
|---|---|---|
| committer | Vinod Koul <vkoul@kernel.org> | 2022-08-30 07:46:41 +0300 |
| commit | c60561014257699d81ab392eb6cb6389ad8907df (patch) | |
| tree | 477c21fb7f9ce71f7a81d7020aea5a6b50cd3501 /include/linux/soundwire | |
| parent | 88de0a8f48bc2339e8c279315320e6f406ff5f96 (diff) | |
| download | linux-c60561014257699d81ab392eb6cb6389ad8907df.tar.xz | |
soundwire: bus: allow device number to be unique at system level
The SoundWire specification allows the device number to be allocated
at will. When a system includes multiple SoundWire links, the device
number scope is limited to the link to which the device is attached.
However, for integration/debug it can be convenient to have a unique
device number across the system. This patch adds a 'dev_num_ida_min'
field at the bus level, which when set will be used to allocate an
IDA.
The allocation happens when a hardware device reports as ATTACHED. If
any error happens during the enumeration, the allocated IDA is not
freed - the device number will be reused if/when the device re-joins
the bus. The IDA is only freed when the Linux device is unregistered.
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Reviewed-by: Rander Wang <rander.wang@intel.com>
Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Link: https://lore.kernel.org/r/20220823045004.2670658-3-yung-chuan.liao@linux.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Diffstat (limited to 'include/linux/soundwire')
| -rw-r--r-- | include/linux/soundwire/sdw.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/soundwire/sdw.h b/include/linux/soundwire/sdw.h index 39058c841469..a2b31d25ea27 100644 --- a/include/linux/soundwire/sdw.h +++ b/include/linux/soundwire/sdw.h @@ -889,6 +889,9 @@ struct sdw_master_ops { * meaningful if multi_link is set. If set to 1, hardware-based * synchronization will be used even if a stream only uses a single * SoundWire segment. + * @dev_num_ida_min: if set, defines the minimum values for the IDA + * used to allocate system-unique device numbers. This value needs to be + * identical across all SoundWire bus in the system. */ struct sdw_bus { struct device *dev; @@ -913,6 +916,7 @@ struct sdw_bus { u32 bank_switch_timeout; bool multi_link; int hw_sync_min_links; + int dev_num_ida_min; }; int sdw_bus_master_add(struct sdw_bus *bus, struct device *parent, |