Document what this op does.

Signed-off-by: Hans Verkuil <hans.verk...@cisco.com>
---
 Documentation/media/kapi/cec-core.rst | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/Documentation/media/kapi/cec-core.rst 
b/Documentation/media/kapi/cec-core.rst
index d37e107f2fde..62b9a1448177 100644
--- a/Documentation/media/kapi/cec-core.rst
+++ b/Documentation/media/kapi/cec-core.rst
@@ -103,6 +103,7 @@ your driver:
                /* Low-level callbacks */
                int (*adap_enable)(struct cec_adapter *adap, bool enable);
                int (*adap_monitor_all_enable)(struct cec_adapter *adap, bool 
enable);
+               int (*adap_monitor_pin_enable)(struct cec_adapter *adap, bool 
enable);
                int (*adap_log_addr)(struct cec_adapter *adap, u8 logical_addr);
                int (*adap_transmit)(struct cec_adapter *adap, u8 attempts,
                                      u32 signal_free_time, struct cec_msg 
*msg);
@@ -144,6 +145,19 @@ called if the CEC_CAP_MONITOR_ALL capability is set. This 
callback is optional
 Note that adap_monitor_all_enable must return 0 if enable is false.


+To enable/disable the 'monitor pin' mode:
+
+.. c:function::
+       int (*adap_monitor_pin_enable)(struct cec_adapter *adap, bool enable);
+
+If enabled, then the adapter should be put in a mode to also monitor CEC pin
+changes. Not all hardware supports this and this function is only called if
+the CEC_CAP_MONITOR_PIN capability is set. This callback is optional
+(some hardware may always be in 'monitor pin' mode).
+
+Note that adap_monitor_pin_enable must return 0 if enable is false.
+
+
 To program a new logical address:

 .. c:function::
-- 
2.14.1

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