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authorPierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>2020-05-18 20:43:21 +0300
committerVinod Koul <vkoul@kernel.org>2020-05-19 10:14:35 +0300
commit7ceaa40b930e462ba0477ca6af34ec04d08181dc (patch)
treee566106b5a14929c7b42a0e180a3f046fe74b392 /drivers/soundwire/bus.c
parentdbb50c7a9949506f750d59d9ba4d58f0ce8ccd42 (diff)
downloadlinux-7ceaa40b930e462ba0477ca6af34ec04d08181dc.tar.xz
soundwire: bus_type: add sdw_master_device support
In the existing SoundWire code, Master Devices are not explicitly represented - only SoundWire Slave Devices are exposed (the use of capital letters follows the SoundWire specification conventions). With the existing code, the bus is handled without using a proper device, and bus->dev typically points to a platform device. The right thing to do as discussed in multiple reviews is use a device for each bus. The sdw_master_device addition is done with minimal internal plumbing and not exposed externally. The existing API based on sdw_bus_master_add() and sdw_bus_master_delete() will deal with the sdw_master_device life cycle, which minimizes changes to existing drivers. Note that the Intel code will be modified in follow-up patches (no impact on any platform since the connection with ASoC is not supported upstream so far). Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com> Acked-by: Jaroslav Kysela <perex@perex.cz> Link: https://lore.kernel.org/r/20200518174322.31561-5-yung-chuan.liao@linux.intel.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
Diffstat (limited to 'drivers/soundwire/bus.c')
-rw-r--r--drivers/soundwire/bus.c14
1 files changed, 11 insertions, 3 deletions
diff --git a/drivers/soundwire/bus.c b/drivers/soundwire/bus.c
index 03d72fa3c190..11cfe435e4a8 100644
--- a/drivers/soundwire/bus.c
+++ b/drivers/soundwire/bus.c
@@ -37,14 +37,21 @@ int sdw_bus_master_add(struct sdw_bus *bus, struct device *parent,
struct sdw_master_prop *prop = NULL;
int ret;
- if (!bus->dev) {
- pr_err("SoundWire bus has no device\n");
+ if (!parent) {
+ pr_err("SoundWire parent device is not set\n");
return -ENODEV;
}
ret = sdw_get_id(bus);
if (ret) {
- dev_err(bus->dev, "Failed to get bus id\n");
+ dev_err(parent, "Failed to get bus id\n");
+ return ret;
+ }
+
+ ret = sdw_master_device_add(bus, parent, fwnode);
+ if (ret) {
+ dev_err(parent, "Failed to add master device at link %d\n",
+ bus->link_id);
return ret;
}
@@ -161,6 +168,7 @@ static int sdw_delete_slave(struct device *dev, void *data)
void sdw_bus_master_delete(struct sdw_bus *bus)
{
device_for_each_child(bus->dev, NULL, sdw_delete_slave);
+ sdw_master_device_del(bus);
sdw_bus_debugfs_exit(bus);
ida_free(&sdw_ida, bus->id);