From: Heiko Stuebner <heiko@sntech.de>
To: gregkh@linuxfoundation.org
Cc: jslaby@suse.com, andriy.shevchenko@linux.intel.com,
matwey.kornilov@gmail.com, linux-serial@vger.kernel.org,
linux-kernel@vger.kernel.org, heiko@sntech.de, lukas@wunner.de,
christoph.muellner@theobroma-systems.com,
giulio.benetti@micronovasrl.com,
Sascha Weisenberger <sascha.weisenberger@siemens.com>,
Jan Kiszka <jan.kiszka@siemens.com>,
Heiko Stuebner <heiko.stuebner@theobroma-systems.com>
Subject: [PATCH DON'T APPLY v2 2/7] dt-bindings: serial: Add binding for rs485 bus termination GPIO
Date: Thu, 26 Mar 2020 00:14:17 +0100 [thread overview]
Message-ID: <20200325231422.1502366-3-heiko@sntech.de> (raw)
In-Reply-To: <20200325231422.1502366-1-heiko@sntech.de>
From: Lukas Wunner <lukas@wunner.de>
Commit e8759ad17d41 ("serial: uapi: Add support for bus termination")
introduced the ability to enable rs485 bus termination from user space.
So far the feature is only used by a single driver, 8250_exar.c, using a
hardcoded GPIO pin specific to Siemens IOT2040 products.
Provide for a more generic solution by allowing specification of an
rs485 bus termination GPIO pin in the device tree. An upcoming commit
implements support for this pin for any 8250 driver. The binding is
used in device trees of the "Revolution Pi" PLCs offered by KUNBUS.
Signed-off-by: Lukas Wunner <lukas@wunner.de>
Cc: Sascha Weisenberger <sascha.weisenberger@siemens.com>
Cc: Jan Kiszka <jan.kiszka@siemens.com>
[moved to yaml rs485 binding]
Signed-off-by: Heiko Stuebner <heiko.stuebner@theobroma-systems.com>
---
Documentation/devicetree/bindings/serial/rs485.yaml | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/Documentation/devicetree/bindings/serial/rs485.yaml b/Documentation/devicetree/bindings/serial/rs485.yaml
index d4beaf11222d..a9ad17864889 100644
--- a/Documentation/devicetree/bindings/serial/rs485.yaml
+++ b/Documentation/devicetree/bindings/serial/rs485.yaml
@@ -43,3 +43,7 @@ properties:
rs485-rx-during-tx:
description: enables the receiving of data even while sending data.
$ref: /schemas/types.yaml#/definitions/flag
+
+ rs485-term-gpios:
+ description: GPIO pin to enable RS485 bus termination.
+ maxItems: 1
--
2.24.1
next prev parent reply other threads:[~2020-03-25 23:15 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-25 23:14 [PATCH RFC v2 0/7] serial: 8250: Add rs485 emulation to 8250_dw Heiko Stuebner
2020-03-25 23:14 ` [PATCH DON'T APPLY v2 1/7] serial: Allow uart_get_rs485_mode() to return errno Heiko Stuebner
2020-03-25 23:14 ` Heiko Stuebner [this message]
2020-03-25 23:14 ` [PATCH DON'T APPLY v2 3/7] serial: 8250: Support rs485 bus termination GPIO Heiko Stuebner
2020-03-30 14:51 ` Andy Shevchenko
2020-03-25 23:14 ` [PATCH v2 4/7] serial: 8250: Handle implementations not having TEMT interrupt using em485 Heiko Stuebner
2020-03-25 23:47 ` Giulio Benetti
2020-03-26 0:05 ` Heiko Stübner
2020-03-26 2:02 ` Giulio Benetti
2020-05-17 15:04 ` Heiko Stübner
2020-05-17 17:28 ` Giulio Benetti
2020-03-30 14:52 ` Andy Shevchenko
2020-05-02 13:49 ` Lukas Wunner
2020-05-05 16:38 ` Maarten Brock
2020-05-17 22:01 ` Heiko Stübner
2020-03-25 23:14 ` [PATCH v2 5/7] dt-bindings: serial: Add binding for rs485 receiver enable GPIO Heiko Stuebner
2020-03-30 14:54 ` Andy Shevchenko
2020-05-02 13:51 ` Lukas Wunner
2020-03-25 23:14 ` [PATCH v2 6/7] serial: 8250: Support separate rs485 rx-enable GPIO Heiko Stuebner
2020-03-30 14:56 ` Andy Shevchenko
2020-05-16 20:14 ` Lukas Wunner
2020-03-25 23:14 ` [PATCH v2 7/7] serial: 8250_dw: add em485 support Heiko Stuebner
2020-05-06 15:25 ` Andy Shevchenko
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