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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/Documentation/ABI/testing/sysfs-ptp
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@@ -69,7 +69,7 @@
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 		pin offered by the PTP hardware clock. The file name
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 		is the hardware dependent pin name. Reading from this
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 		file produces two numbers, the assigned function (see
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-		the PTP_PF_ enumeration values in linux/ptp_clock.h)
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+		the `PTP_PF_` enumeration values in linux/ptp_clock.h)
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 		and the channel number. The function and channel
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 		assignment may be changed by two writing numbers into
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 		the file.