Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit e2860e1f authored by Joel Stanley's avatar Joel Stanley Committed by Greg Kroah-Hartman
Browse files

serial: 8250_of: Add reset support 



This adds the hooks for an optional reset controller in the 8250 device
tree node.

Signed-off-by: default avatarJoel Stanley <joel@jms.id.au>
Reviewed-by: default avatarPhilipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 71e07791

Documentation/devicetree/bindings/serial/8250.txt

+1 −0
Original line number Diff line number Diff line
@@ -47,6 +47,7 @@ Optional properties: 
  property.

- tx-threshold: Specify the TX FIFO low water indication for parts with

  programmable TX FIFO thresholds.

- resets : phandle + reset specifier pairs



Note:

* fsl,ns16550:

drivers/tty/serial/8250/8250_of.c

+10 −0
Original line number Diff line number Diff line
@@ -19,11 +19,13 @@ 
#include <linux/of_irq.h>

#include <linux/of_platform.h>

#include <linux/clk.h>

#include <linux/reset.h>



#include "8250.h"



struct of_serial_info {

	struct clk *clk;

	struct reset_control *rst;

	int type;

	int line;

};
@@ -132,6 +134,13 @@ static int of_platform_serial_setup(struct platform_device *ofdev, 
		}

	}



	info->rst = devm_reset_control_get_optional_shared(&ofdev->dev, NULL);

	if (IS_ERR(info->rst))

		goto out;

	ret = reset_control_deassert(info->rst);

	if (ret)

		goto out;



	port->type = type;

	port->uartclk = clk;

	port->flags = UPF_SHARE_IRQ | UPF_BOOT_AUTOCONF | UPF_IOREMAP
@@ -229,6 +238,7 @@ static int of_platform_serial_remove(struct platform_device *ofdev) 


	serial8250_unregister_port(info->line);



	reset_control_assert(info->rst);

	if (info->clk)

		clk_disable_unprepare(info->clk);

	kfree(info);