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+What: /sys/bus/platform/devices/[..]/fsi-master-gpio/external_mode
+Date: Feb 2018
+KernelVersion: 4.17
+Contact: jk@ozlabs.org
+Description:
+ Controls access arbitration for GPIO-based FSI master. A
+ value of 0 (the default) sets normal mode, where the
+ driver performs FSI bus transactions, 1 sets external mode,
+ where the FSI bus is driven externally (for example, by
+ a debug device).