[PATCH v2 4/6] ASoC: SDCA: add sdca_asoc_dai_is_pdm() helper

[Srinivas Kandagatla]

Resolve the SDCA terminal type for a DAI and return true for the
spec-defined PDM terminals (SDCA_TERM_TYPE_RAW_PDM_MIC and
SDCA_TERM_TYPE_PDM_RENDER_STREAM).

Used by sdca_class_function to tag PDM streams; expose it so other
SDCA codec drivers can share the check.

Assisted-by: LLM
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@xxxxxxxxxxxxxxxx>
---
 include/sound/sdca_asoc.h  |  2 ++
 sound/soc/sdca/sdca_asoc.c | 23 +++++++++++++++++++++++
 2 files changed, 25 insertions(+)

diff --git a/include/sound/sdca_asoc.h b/include/sound/sdca_asoc.h
index 599a72f33515..99c39b5944e3 100644
--- a/include/sound/sdca_asoc.h
+++ b/include/sound/sdca_asoc.h
@@ -112,4 +112,6 @@ int sdca_asoc_pde_poll_actual_ps(struct regmap *regmap,
 				 int from_ps, int to_ps,
 				 const struct sdca_pde_delay *pde_delays,
 				 int num_delays);
+bool sdca_asoc_dai_is_pdm(struct sdca_function_data *function,
+			  struct snd_soc_dai *dai);
 #endif // __SDCA_ASOC_H__
diff --git a/sound/soc/sdca/sdca_asoc.c b/sound/soc/sdca/sdca_asoc.c
index ccc579f878ff..559a0fdfd98e 100644
--- a/sound/soc/sdca/sdca_asoc.c
+++ b/sound/soc/sdca/sdca_asoc.c
@@ -1781,3 +1781,26 @@ int sdca_asoc_hw_params(struct device *dev, struct regmap *regmap,
 	return 0;
 }
 EXPORT_SYMBOL_NS(sdca_asoc_hw_params, "SND_SOC_SDCA");
+
+/**
+ * sdca_asoc_dai_is_pdm - True if the DAI is routed to a PDM data-port terminal
+ * @function: Pointer to the Function information.
+ * @dai: Pointer to the ASoC DAI.
+ *
+ * Return: true for SDCA_TERM_TYPE_RAW_PDM_MIC and
+ * SDCA_TERM_TYPE_PDM_RENDER_STREAM, false otherwise.
+ */
+bool sdca_asoc_dai_is_pdm(struct sdca_function_data *function,
+			  struct snd_soc_dai *dai)
+{
+	struct sdca_entity *entity = &function->entities[dai->id];
+
+	switch (entity->iot.type) {
+	case SDCA_TERM_TYPE_RAW_PDM_MIC:
+	case SDCA_TERM_TYPE_PDM_RENDER_STREAM:
+		return true;
+	default:
+		return false;
+	}
+}
+EXPORT_SYMBOL_NS(sdca_asoc_dai_is_pdm, "SND_SOC_SDCA");
-- 
2.53.0