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: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Thomas Abraham <thomas.abraham@linaro.org>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

diff --git a/Documentation/devicetree/bindings/serial/samsung_uart.txt b/Documentation/devicetree/bindings/serial/samsung_uart.txt
new file mode 100644 (file)
index 0000000..2c8a17c
--- /dev/null
+++ b/Documentation/devicetree/bindings/serial/samsung_uart.txt
@@ -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.

diff --git a/drivers/tty/serial/samsung.c b/drivers/tty/serial/samsung.c
index c89987b..efe3756 100644 (file)
--- a/drivers/tty/serial/samsung.c
+++ b/drivers/tty/serial/samsung.c
@@ -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,
        },
 };