From c2571ba86c4b3469f8c4dad26ffc8aed654a9a07 Mon Sep 17 00:00:00 2001
From: Curtis Malainey <cujomalainey@chromium.org>
Date: Tue, 24 Sep 2019 11:12:44 -0700
Subject: [PATCH] ucm: docs: Add EchoReferencePCM

Sometimes userspace may want to use a reference channel to cancel echos
when using video chat, this value identifies the device which carries
that channel.

Signed-off-by: Curtis Malainey <cujomalainey@chromium.org>
---
 include/use-case.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/include/use-case.h b/include/use-case.h
index a25c0296..8f66bd77 100644
--- a/include/use-case.h
+++ b/include/use-case.h
@@ -349,6 +349,9 @@ int snd_use_case_get_list(snd_use_case_mgr_t *uc_mgr,
  *   - CoupledMixers
  *      - Mixer controls that should be changed together.
  *        E.g. "Left Master,Right Master".
+ *   - EchoReferencePCM
+ *      - If userspace wants an echo reference channel this value identifies
+ *        the pcm to be used.
  *   - EDIDFile
  *      - Path to EDID file for HDMI devices
  *   - JackCTL