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ACPI / property: Document RS485 _DSD properties

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

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20220426122448.38997-5-ilpo.jarvinen@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Ilpo Järvinen 2022-04-26 15:24:42 +03:00 committed by Greg Kroah-Hartman
parent 103dcf2ea2
commit 1e70d57e72
1 changed files with 25 additions and 0 deletions
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25
Documentation/firmware-guide/acpi/enumeration.rst
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@ -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
===========