Re: [PATCH v2 05/11] ASoC: SDCA: add populate_function hw_op for DT function data

sdca_parse_function() walks a firmware node, but on DT there is no
DisCo node -- sdca_lookup_functions() is a no-op and the SDCA
function descriptors come with a NULL fwnode.

Add a populate_function hw_op that the class function driver falls
back to when @function->desc->node is NULL: it fills the caller-owned
sdca_function_data (entities, clusters, init_table, delays) from the
codec's static tables, matching by function type.  Leave
@function->desc alone -- the framework owns the per-instance
descriptor, so devices with more than one function of the same type
keep their per-instance SoundWire address.

Signed-off-by: Srinivas Kandagatla <redacted>
---

diff --git a/sound/soc/sdca/sdca_class_function.c b/sound/soc/sdca/sdca_class_function.c
index 10a2b031b572..8bca88865a4d 100644
--- a/sound/soc/sdca/sdca_class_function.c
+++ b/sound/soc/sdca/sdca_class_function.c

@@ -329,7 +329,14 @@ static int class_function_probe(struct auxiliary_device *auxdev,
 	drv->core = core;
 	drv->function = &sdev->function;
 
-	ret = sdca_parse_function(dev, drv->function);
+	if (drv->function->desc->node) {
+		ret = sdca_parse_function(dev, drv->function);
+	} else if (core->hw_ops && core->hw_ops->populate_function) {
+		ret = core->hw_ops->populate_function(core->sdw, drv->function);
+	} else {
+		dev_err(dev, "no firmware node and no populate_function hook\n");
+		return -ENOENT;
+	}