Documentation: sysfs: Document the Lantiq PEF2256 sysfs entry

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Subject: [PATCH 3/7] Documentation: sysfs: Document the Lantiq PEF2256 sysfs
 entry
Date: Wed, 15 Mar 2023 14:42:27 +0100
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Document the "subordinate" sysfs attribute exposed by the pef2256
driver.

Signed-off-by: Herve Codina <herve.codina@bootlin.com>

Documentation/ABI/testing/sysfs-bus-platform-devices-pef2256

@@ -0,0 +1,10 @@
+What:		/sys/bus/platform/devices/*.pef2256/subordinate
+KernelVersion:	6.4
+Contact:	Herve Codina <herve.codina@bootlin.com>
+Description:
+		(RW) Controls whether the PEF2256 works as subordinate or main
+		device mode.
+		  - 0 : main device mode
+		  - 1 : subordinate mode
+		In subordinate device mode it synchronizes on line interface
+		clock signals. Otherwise, it synchronizes on internal clocks.