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Commit 26c919e1 authored by Thomas Abraham's avatar Thomas Abraham Committed by Kukjin Kim
Browse files

serial: samsung: add device tree support 



Add device tree based discovery support for Samsung's uart controller.

Cc: Ben Dooks <ben-linux@fluff.org>
Acked-by: default avatarGrant Likely <grant.likely@secretlab.ca>
Signed-off-by: default avatarThomas Abraham <thomas.abraham@linaro.org>
Signed-off-by: default avatarKukjin Kim <kgene.kim@samsung.com>
parent da121506

Documentation/devicetree/bindings/serial/samsung_uart.txt

0 → 100644
+14 −0
Original line number Diff line number Diff line 
* Samsung's UART Controller



The Samsung's UART controller is used for interfacing SoC with serial communicaion

devices.



Required properties:

- compatible: should be

  - "samsung,exynos4210-uart", for UART's compatible with Exynos4210 uart ports.



- reg: base physical address of the controller and length of memory mapped

  region.



- interrupts: interrupt number to the cpu. The interrupt specifier format depends

  on the interrupt controller parent.

drivers/tty/serial/samsung.c

+34 −2
Original line number Diff line number Diff line
@@ -42,6 +42,7 @@ 
#include <linux/delay.h>

#include <linux/clk.h>

#include <linux/cpufreq.h>

#include <linux/of.h>



#include <asm/irq.h>
@@ -1163,10 +1164,26 @@ static ssize_t s3c24xx_serial_show_clksrc(struct device *dev, 


static DEVICE_ATTR(clock_source, S_IRUGO, s3c24xx_serial_show_clksrc, NULL);





/* Device driver serial port probe */



static const struct of_device_id s3c24xx_uart_dt_match[];

static int probe_index;



static inline struct s3c24xx_serial_drv_data *s3c24xx_get_driver_data(

			struct platform_device *pdev)

{

#ifdef CONFIG_OF

	if (pdev->dev.of_node) {

		const struct of_device_id *match;

		match = of_match_node(s3c24xx_uart_dt_match, pdev->dev.of_node);

		return (struct s3c24xx_serial_drv_data *)match->data;

	}

#endif

	return (struct s3c24xx_serial_drv_data *)

			platform_get_device_id(pdev)->driver_data;

}



static int s3c24xx_serial_probe(struct platform_device *pdev)

{

	struct s3c24xx_uart_port *ourport;
@@ -1176,8 +1193,11 @@ static int s3c24xx_serial_probe(struct platform_device *pdev) 


	ourport = &s3c24xx_serial_ports[probe_index];



	ourport->drv_data = (struct s3c24xx_serial_drv_data *)

			platform_get_device_id(pdev)->driver_data;

	ourport->drv_data = s3c24xx_get_driver_data(pdev);

	if (!ourport->drv_data) {

		dev_err(&pdev->dev, "could not find driver data\n");

		return -ENODEV;

	}



	ourport->info = ourport->drv_data->info;

	ourport->cfg = (pdev->dev.platform_data) ?
@@ -1626,6 +1646,17 @@ static struct platform_device_id s3c24xx_serial_driver_ids[] = { 
};

MODULE_DEVICE_TABLE(platform, s3c24xx_serial_driver_ids);



#ifdef CONFIG_OF

static const struct of_device_id s3c24xx_uart_dt_match[] = {

	{ .compatible = "samsung,exynos4210-uart",

		.data = &exynos4210_serial_drv_data },

	{},

};

MODULE_DEVICE_TABLE(of, s3c24xx_uart_dt_match);

#else

#define s3c24xx_uart_dt_match NULL

#endif



static struct platform_driver samsung_serial_driver = {

	.probe		= s3c24xx_serial_probe,

	.remove		= __devexit_p(s3c24xx_serial_remove),
@@ -1634,6 +1665,7 @@ static struct platform_driver samsung_serial_driver = { 
		.name	= "samsung-uart",

		.owner	= THIS_MODULE,

		.pm	= SERIAL_SAMSUNG_PM_OPS,

		.of_match_table	= s3c24xx_uart_dt_match,

	},

};