Commit 1e70d57e authored by Ilpo Järvinen's avatar Ilpo Järvinen Committed by Greg Kroah-Hartman
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ACPI / property: Document RS485 _DSD properties 



Document RS485 related properties returned from ACPI _DSD as device
properties.

Signed-off-by: default avatarIlpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20220426122448.38997-5-ilpo.jarvinen@linux.intel.com


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 103dcf2e

Documentation/firmware-guide/acpi/enumeration.rst

+25 −0
Original line number Diff line number Diff line
@@ -390,6 +390,31 @@ descriptors once the device is released. 
See Documentation/firmware-guide/acpi/gpio-properties.rst for more information

about the _DSD binding related to GPIOs.



RS-485 support

==============



ACPI _DSD (Device Specific Data) can be used to describe RS-485 capability

of UART.



For example::



	Device (DEV)

	{

		...



		// ACPI 5.1 _DSD used for RS-485 capabilities

		Name (_DSD, Package ()

		{

			ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"),

			Package ()

			{

				Package () {"rs485-rts-active-low", Zero},

				Package () {"rs485-rx-active-high", Zero},

				Package () {"rs485-rx-during-tx", Zero},

			}

		})

		...



MFD devices

===========