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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,
	Heiko Stuebner <heiko.stuebner@theobroma-systems.com>
Subject: [PATCH v2 5/7] dt-bindings: serial: Add binding for rs485 receiver enable GPIO
Date: Thu, 26 Mar 2020 00:14:20 +0100
Message-ID: <20200325231422.1502366-6-heiko@sntech.de> (raw)
In-Reply-To: <20200325231422.1502366-1-heiko@sntech.de>

From: Heiko Stuebner <heiko.stuebner@theobroma-systems.com>

RS485 has two signals to control transmissions "drivee enable" (RE) and
"receiver enable" (DE). RE is already handled via the uarts RTS signal
while RE signal on most implementations doesn't get handled separately
at all.

As there still will be cases where this is needed though add a gpio
property for declaring this signal pin.

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 a9ad17864889..e55730de796d 100644
--- a/Documentation/devicetree/bindings/serial/rs485.yaml
+++ b/Documentation/devicetree/bindings/serial/rs485.yaml
@@ -44,6 +44,10 @@ properties:
    description: enables the receiving of data even while sending data.
    $ref: /schemas/types.yaml#/definitions/flag
 
+  rs485-rx-enable-gpios:
+   description: GPIO to handle a separate RS485 receive enable signal
+   $ref: /schemas/types.yaml#/definitions/flag
+
   rs485-term-gpios:
     description: GPIO pin to enable RS485 bus termination.
     maxItems: 1
-- 
2.24.1


  parent reply index

Thread overview: 15+ 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 ` [PATCH DON'T APPLY v2 2/7] dt-bindings: serial: Add binding for rs485 bus termination GPIO Heiko Stuebner
2020-03-25 23:14 ` [PATCH DON'T APPLY v2 3/7] serial: 8250: Support " 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
2020-03-30 14:52   ` Andy Shevchenko
2020-03-25 23:14 ` Heiko Stuebner [this message]
2020-03-30 14:54   ` [PATCH v2 5/7] dt-bindings: serial: Add binding for rs485 receiver enable GPIO Andy Shevchenko
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
2020-03-25 23:14 ` [PATCH v2 7/7] serial: 8250_dw: add em485 support Heiko Stuebner

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