mb/google/octopus: add audio codec into SSFC support for Bobba

BUG=b:174118027
BRANCH=octopus
TEST=adjust SSFC value of CBI to select RT5682 or DA7219 then check
whether device tree is updated correspondingly by disabling unselected
one.

Signed-off-by: Marco Chen <marcochen@google.com>
Change-Id: Id37c4c5716ade0851cfcb24e12b390841e633ac9
Reviewed-on: https://review.coreboot.org/c/coreboot/+/48795
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Zhuohao Lee <zhuohao@chromium.org>

1 files changed, 38 insertions, 0 deletions

diff --git a/src/mainboard/google/octopus/variants/baseboard/include/baseboard/cbi_ssfc.h b/src/mainboard/google/octopus/variants/baseboard/include/baseboard/cbi_ssfc.h
new file mode 100644
index 0000000000..84020d7eb3
--- /dev/null
+++ b/src/mainboard/google/octopus/variants/baseboard/include/baseboard/cbi_ssfc.h
@@ -0,0 +1,38 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#ifndef _OCTOPUS_CBI_SSFC__H_
+#define _OCTOPUS_CBI_SSFC__H_
+
+#include <inttypes.h>
+
+/****************************************************************************
+ * Octopus CBI Second Source Factory Cache
+ *
+ * SSFC was introduced after variants were MPed already so we can expect there
+ * can be devices in the field without SSFC field in the CBI. For devices
+ * without SSFC field in the CBI, the value of SSFC will be 0 set by get_ssfc()
+ * in the cbi_ssfc.c.
+ *
+ * On the other hand, taking audio codec as the example there are two sources -
+ * DA7219 and RT5682 used in the MPed devices before introducing SSFC. As a
+ * result, the value 0 of each bits group for a specific component is defined as
+ * DEFAULT and different variants should transform this DEFAULT to one of
+ * sources they used as the first sources. In the example here, either DA7219 or
+ * RT5682 should be transformed.
+ */
+
+/*
+ * Audio Codec (Bits 9-11)
+ *
+ */
+enum ssfc_audio_codec {
+	SSFC_AUDIO_CODEC_DEFAULT,
+	SSFC_AUDIO_CODEC_DA7219,
+	SSFC_AUDIO_CODEC_RT5682,
+};
+#define SSFC_AUDIO_CODEC_OFFSET		9
+#define SSFC_AUDIO_CODEC_MASK		0x7
+
+enum ssfc_audio_codec ssfc_get_audio_codec(void);
+
+#endif /* _OCTOPUS_CBI_SSFC__H_ */