From: "Ilpo Järvinen" <ilpo.jarvinen@linux.intel.com>
To: linux-serial@vger.kernel.org,
Greg KH <gregkh@linuxfoundation.org>,
Jiri Slaby <jirislaby@kernel.org>, Lukas Wunner <lukas@wunner.de>,
Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: "Johan Hovold" <johan@kernel.org>,
heiko@sntech.de, giulio.benetti@micronovasrl.com,
"Heikki Krogerus" <heikki.krogerus@linux.intel.com>,
"Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>,
"Ilpo Järvinen" <ilpo.jarvinen@linux.intel.com>
Subject: [PATCH v2 06/12] ACPI / property: Document RS485 _DSD properties
Date: Mon, 4 Apr 2022 11:29:06 +0300 [thread overview]
Message-ID: <20220404082912.6885-7-ilpo.jarvinen@linux.intel.com> (raw)
In-Reply-To: <20220404082912.6885-1-ilpo.jarvinen@linux.intel.com>
Document RS485 related properties returned from ACPI _DSD
as device properties.
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
---
.../firmware-guide/acpi/enumeration.rst | 25 +++++++++++++++++++
1 file changed, 25 insertions(+)
diff --git a/Documentation/firmware-guide/acpi/enumeration.rst b/Documentation/firmware-guide/acpi/enumeration.rst
index 74b830b2fd59..b42017bf789e 100644
--- a/Documentation/firmware-guide/acpi/enumeration.rst
+++ b/Documentation/firmware-guide/acpi/enumeration.rst
@@ -374,6 +374,31 @@ 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
===========
--
2.30.2
next prev parent reply other threads:[~2022-04-04 8:30 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-04 8:29 [PATCH v2 00/12] Add RS485 support to DW UART Ilpo Järvinen
2022-04-04 8:29 ` [PATCH v2 01/12] serial: Store character timing information to uart_port Ilpo Järvinen
2022-04-04 8:29 ` [PATCH v2 02/12] serial: 8250: Handle UART without interrupt on TEMT Ilpo Järvinen
2022-04-04 8:29 ` [PATCH v2 03/12] serial: 8250_dwlib: RS485 HW half & full duplex support Ilpo Järvinen
2022-04-04 8:29 ` [PATCH v2 04/12] serial: 8250_dwlib: Implement SW half " Ilpo Järvinen
2022-04-04 8:29 ` [PATCH v2 05/12] dt_bindings: rs485: Add receiver enable polarity Ilpo Järvinen
2022-04-06 17:54 ` Rob Herring
2022-04-04 8:29 ` Ilpo Järvinen [this message]
2022-04-04 8:29 ` [PATCH v2 07/12] serial: termbits: ADDRB to indicate 9th bit addressing mode Ilpo Järvinen
2022-04-04 8:52 ` Arnd Bergmann
2022-04-04 9:10 ` Ilpo Järvinen
2022-04-04 8:29 ` [PATCH v2 08/12] serial: General support for multipoint addresses Ilpo Järvinen
2022-04-04 8:29 ` [PATCH v2 09/12] serial: 8250: make saved LSR larger Ilpo Järvinen
2022-04-04 8:29 ` [PATCH v2 10/12] serial: 8250: create lsr_save_mask Ilpo Järvinen
2022-04-04 8:29 ` [PATCH v2 11/12] serial: 8250_lpss: Use 32-bit reads Ilpo Järvinen
2022-04-04 8:29 ` [PATCH v2 12/12] serial: 8250_dwlib: Support for 9th bit multipoint addressing Ilpo Järvinen
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