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>,
"Rob Herring" <robh+dt@kernel.org>,
devicetree@vger.kernel.org
Subject: [PATCH v2 05/12] dt_bindings: rs485: Add receiver enable polarity
Date: Mon, 4 Apr 2022 11:29:05 +0300 [thread overview]
Message-ID: <20220404082912.6885-6-ilpo.jarvinen@linux.intel.com> (raw)
In-Reply-To: <20220404082912.6885-1-ilpo.jarvinen@linux.intel.com>
Add polarity property for receiver enable. Some UARTs have
separate enable pins for tx (RTS or DE) and rx (RE). As most
RS485 transceivers have !RE pin, the default is active low in
contrast to rs485-rts-active-low that defaults to active high.
Cc: Rob Herring <robh+dt@kernel.org>
Cc: devicetree@vger.kernel.org
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
---
Documentation/devicetree/bindings/serial/rs485.yaml | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/Documentation/devicetree/bindings/serial/rs485.yaml b/Documentation/devicetree/bindings/serial/rs485.yaml
index 0c9fa694f85c..f2c9c9fe6aa7 100644
--- a/Documentation/devicetree/bindings/serial/rs485.yaml
+++ b/Documentation/devicetree/bindings/serial/rs485.yaml
@@ -33,6 +33,11 @@ properties:
description: drive RTS low when sending (default is high).
$ref: /schemas/types.yaml#/definitions/flag
+ rs485-rx-active-high:
+ description: Polarity of receiver enable signal (when separate from RTS).
+ True indicates active high (default is low).
+ $ref: /schemas/types.yaml#/definitions/flag
+
linux,rs485-enabled-at-boot-time:
description: enables the rs485 feature at boot time. It can be disabled
later with proper ioctl.
--
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 ` Ilpo Järvinen [this message]
2022-04-06 17:54 ` [PATCH v2 05/12] dt_bindings: rs485: Add receiver enable polarity Rob Herring
2022-04-04 8:29 ` [PATCH v2 06/12] ACPI / property: Document RS485 _DSD properties Ilpo Järvinen
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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