[PATCH 5/7] ASoC: SDCA: Add flag for unused IRQs

[Charles Keepax <ckeepax@opensource.cirrus.com>]

Zero is a valid SDCA IRQ interrupt position so add a special value to
indicate that the IRQ is not used.

Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
---
 include/sound/sdca_function.h   | 2 ++
 sound/soc/sdca/sdca_functions.c | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/include/sound/sdca_function.h b/include/sound/sdca_function.h
index e5166583d2581..f208d8f03db4e 100644
--- a/include/sound/sdca_function.h
+++ b/include/sound/sdca_function.h
@@ -16,6 +16,8 @@ struct device;
 struct sdca_entity;
 struct sdca_function_desc;
 
+#define SDCA_NO_INTERRUPT -1
+
 /*
  * The addressing space for SDCA relies on 7 bits for Entities, so a
  * maximum of 128 Entities per function can be represented.
diff --git a/sound/soc/sdca/sdca_functions.c b/sound/soc/sdca/sdca_functions.c
index 64ac264438907..3afe9a24e4e45 100644
--- a/sound/soc/sdca/sdca_functions.c
+++ b/sound/soc/sdca/sdca_functions.c
@@ -911,6 +911,8 @@ static int find_sdca_entity_control(struct device *dev, struct sdca_entity *enti
 				       &tmp);
 	if (!ret)
 		control->interrupt_position = tmp;
+	else
+		control->interrupt_position = SDCA_NO_INTERRUPT;
 
 	control->label = find_sdca_control_label(dev, entity, control);
 	if (!control->label)
-- 
2.39.5