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serial: samsung: add device tree support

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

Cc: Ben Dooks <ben-linux@fluff.org>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Thomas Abraham <thomas.abraham@linaro.org>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
This commit is contained in:
Thomas Abraham 2011-11-06 22:10:44 +05:30 committed by Kukjin Kim
parent da121506eb
commit 26c919e1d3
2 changed files with 48 additions and 2 deletions
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14
Documentation/devicetree/bindings/serial/samsung_uart.txt Normal file
View File

@ -0,0 +1,14 @@
* 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.

36
drivers/tty/serial/samsung.c
View File

@ -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,
},
};