Add device tree based discovery support for Samsung's uart controller.
Cc: Ben Dooks <ben-li...@fluff.org>
Cc: Grant Likely <grant.lik...@secretlab.ca>
Signed-off-by: Thomas Abraham <thomas.abra...@linaro.org>
---
.../devicetree/bindings/serial/samsung_uart.txt | 14 ++++++++
drivers/tty/serial/samsung.c | 36 ++++++++++++++++++-
2 files changed, 48 insertions(+), 2 deletions(-)
create mode 100644 Documentation/devicetree/bindings/serial/samsung_uart.txt
diff --git a/Documentation/devicetree/bindings/serial/samsung_uart.txt
b/Documentation/devicetree/bindings/serial/samsung_uart.txt
new file mode 100644
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
--- 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,
},
};
--
1.6.6.rc2
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