修改led为gpio

hc

2024-10-12 a5969cabbb4660eab42b6ef0412cbbd1200cf14d

 kernel/Documentation/ABI/testing/sysfs-bus-css
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@@ -20,6 +20,7 @@
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 Description:	Contains the ids of the channel paths used by this
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 		subchannel, as reported by the channel subsystem
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 		during subchannel recognition.
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+
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 		Note: This is an I/O-subchannel specific attribute.
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 Users:		s390-tools, HAL
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@@ -31,5 +32,30 @@
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 		channel subsystem when last queried by the common I/O
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 		layer (this implies that this attribute is not necessarily
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 		in sync with the values current in the channel subsystem).
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+
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 		Note: This is an I/O-subchannel specific attribute.
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 Users:		s390-tools, HAL
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+
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+What:		/sys/bus/css/devices/.../driver_override
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+Date:		June 2019
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+Contact:	Cornelia Huck <cohuck@redhat.com>
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+		linux-s390@vger.kernel.org
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+Description:	This file allows the driver for a device to be specified. When
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+		specified, only a driver with a name matching the value written
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+		to driver_override will have an opportunity to bind to the
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+		device. The override is specified by writing a string to the
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+		driver_override file (echo vfio-ccw > driver_override) and
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+		may be cleared with an empty string (echo > driver_override).
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+		This returns the device to standard matching rules binding.
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+		Writing to driver_override does not automatically unbind the
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+		device from its current driver or make any attempt to
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+		automatically load the specified driver.  If no driver with a
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+		matching name is currently loaded in the kernel, the device
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+		will not bind to any driver.  This also allows devices to
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+		opt-out of driver binding using a driver_override name such as
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+		"none".  Only a single driver may be specified in the override,
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+		there is no support for parsing delimiters.
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+
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+		Note that unlike the mechanism of the same name for pci, this
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+		file does not allow to override basic matching rules. I.e.,
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+		the driver must still match the subchannel type of the device.