linux-kernel - [PATCH v3 5/5] serial: 8250

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Message-Id: <20200517215610.2131618-6-heiko@sntech.de>
Date:   Sun, 17 May 2020 23:56:10 +0200
From:   Heiko Stuebner <heiko@...ech.de>
To:     gregkh@...uxfoundation.org
Cc:     jslaby@...e.com, andriy.shevchenko@...ux.intel.com,
        matwey.kornilov@...il.com, giulio.benetti@...ronovasrl.com,
        lukas@...ner.de, linux-serial@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        christoph.muellner@...obroma-systems.com, heiko@...ech.de,
        Heiko Stuebner <heiko.stuebner@...obroma-systems.com>
Subject: [PATCH v3 5/5] serial: 8250_dw: add em485 support

From: Giulio Benetti <giulio.benetti@...ronovasrl.com>

Need to use rs485 transceiver so let's use existing em485 485 emulation
layer on top of 8250.

Add rs485_config callback to port and uses the standard em485 start and
stop helpers.

Signed-off-by: Giulio Benetti <giulio.benetti@...ronovasrl.com>
[moved to use newly added start/stop helpers]
Signed-off-by: Heiko Stuebner <heiko.stuebner@...obroma-systems.com>
---
 drivers/tty/serial/8250/8250_dw.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/tty/serial/8250/8250_dw.c b/drivers/tty/serial/8250/8250_dw.c
index 51a7d3b19b39..36d364268a45 100644
--- a/drivers/tty/serial/8250/8250_dw.c
+++ b/drivers/tty/serial/8250/8250_dw.c
@@ -415,6 +415,9 @@ static int dw8250_probe(struct platform_device *pdev)
 	p->serial_out	= dw8250_serial_out;
 	p->set_ldisc	= dw8250_set_ldisc;
 	p->set_termios	= dw8250_set_termios;
+	p->rs485_config = serial8250_em485_config;
+	up->rs485_start_tx = serial8250_em485_start_tx;
+	up->rs485_stop_tx = serial8250_em485_stop_tx;
 
 	p->membase = devm_ioremap(dev, regs->start, resource_size(regs));
 	if (!p->membase)
-- 
2.25.1