soundwire: slave: lookup SDCA version and functions

Use SDCA helpers to get the basic information and store it in the
slave context. The information will be optionally be used in codec
drivers to register sub-devices for each Function.

When platforms are not based on ACPI the helpers do absolutely
nothing.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Péter Ujfalusi <peter.ujfalusi@linux.intel.com>
Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Acked-by: Vinod Koul <vkoul@kernel.org>
Link: https://patch.msgid.link/20241016102333.294448-5-yung-chuan.liao@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/drivers/soundwire/Kconfig b/drivers/soundwire/Kconfig
index 4d8f3b7024ae593c2b7ebdf00cd12c7757a18ae1..f66f869dff2e514f29dc546622303fdc2b4e16a9 100644 (file)
--- a/drivers/soundwire/Kconfig
+++ b/drivers/soundwire/Kconfig
@@ -6,6 +6,7 @@
 menuconfig SOUNDWIRE
        tristate "SoundWire support"
        depends on ACPI || OF
+       depends on SND_SOC_SDCA_OPTIONAL
        help
          SoundWire is a 2-Pin interface with data and clock line ratified
          by the MIPI Alliance. SoundWire is used for transporting data

diff --git a/drivers/soundwire/slave.c b/drivers/soundwire/slave.c
index f1a4df6cfebd9c2143f04abe83c935e7110c3cf9..97cf8bcca04742cb0aa51ba30dbfc535a34a00f3 100644 (file)
--- a/drivers/soundwire/slave.c
+++ b/drivers/soundwire/slave.c
@@ -5,6 +5,7 @@
 #include <linux/of.h>
 #include <linux/soundwire/sdw.h>
 #include <linux/soundwire/sdw_type.h>
+#include <sound/sdca.h>
 #include "bus.h"
 #include "sysfs_local.h"
 
@@ -70,6 +71,17 @@ int sdw_slave_add(struct sdw_bus *bus,
        list_add_tail(&slave->node, &bus->slaves);
        mutex_unlock(&bus->bus_lock);
 
+       /*
+        * The Soundwire driver probe may optionally register SDCA
+        * sub-devices, one per Function. This means the information
+        * on the SDCA revision and the number/type of Functions need
+        * to be extracted from platform firmware before the SoundWire
+        * driver probe, and as a consequence before the SoundWire
+        * device_register() below.
+        */
+       sdca_lookup_interface_revision(slave);
+       sdca_lookup_functions(slave);
+
        ret = device_register(&slave->dev);
        if (ret) {
                dev_err(bus->dev, "Failed to add slave: ret %d\n", ret);
@@ -259,3 +271,5 @@ int sdw_of_find_slaves(struct sdw_bus *bus)
 
        return 0;
 }
+
+MODULE_IMPORT_NS(SND_SOC_SDCA);