1 files changed, 21 insertions, 0 deletions
diff --git a/sound/soc/codecs/cirrus_legacy.h b/sound/soc/codecs/cirrus_legacy.h
new file mode 100644
index 000000000000..87c6fd79290d
--- /dev/null
+++ b/sound/soc/codecs/cirrus_legacy.h
@@ -0,0 +1,21 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Some small helpers for older Cirrus Logic parts.
+ *
+ * Copyright (C) 2021 Cirrus Logic, Inc. and
+ *                    Cirrus Logic International Semiconductor Ltd.
+ */
+
+static inline int cirrus_read_device_id(struct regmap *regmap, unsigned int reg)
+{
+	u8 devid[3];
+	int ret;
+
+	ret = regmap_bulk_read(regmap, reg, devid, ARRAY_SIZE(devid));
+	if (ret < 0)
+		return ret;
+
+	return ((devid[0] & 0xFF) << 12) |
+	       ((devid[1] & 0xFF) <<  4) |
+	       ((devid[2] & 0xF0) >>  4);
+}