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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 7/7] serial: 8250_dw: add em485 support
Date:   Thu, 26 Mar 2020 00:14:22 +0100
Message-Id: <20200325231422.1502366-8-heiko@sntech.de>
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From: Giulio Benetti <giulio.benetti@micronovasrl.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@micronovasrl.com>
[moved to use newly added start/stop helpers]
Signed-off-by: Heiko Stuebner <heiko.stuebner@theobroma-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 aab3cccc6789..588319075b36 100644
--- a/drivers/tty/serial/8250/8250_dw.c
+++ b/drivers/tty/serial/8250/8250_dw.c
@@ -414,6 +414,9 @@ 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)
-- 
2.24.1