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diff --git a/Documentation/ABI/testing/configfs-usb-gadget-uac1 b/Documentation/ABI/testing/configfs-usb-gadget-uac1
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+What: /config/usb-gadget/gadget/functions/uac1.name
+Date: June 2017
+KernelVersion: 4.14
+Description:
+ The attributes:
+
+ c_chmask - capture channel mask
+ c_srate - capture sampling rate
+ c_ssize - capture sample size (bytes)
+ p_chmask - playback channel mask
+ p_srate - playback sampling rate
+ p_ssize - playback sample size (bytes)
+ req_number - the number of pre-allocated request
+ for both capture and playback