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authorGabor Juhos <juhosg@openwrt.org>2013-08-29 08:44:01 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-08-30 14:11:27 -0700
commitdd910d98a2e240443db0090b0ae8a719a4a460f8 (patch)
tree4f149a3230c42b8bb2bdf462b69589a9448cf1c6 /drivers/tty
parent284301ef7c4e5aad2bcb81be5525e4bfc0ba3e31 (diff)
tty: ar933x_uart: add device tree support and binding documentation
Modify the probe routine to get the port line number from device tree if the 'of_node' is populated in the platform device. The driver can be built as module, thus add an OF specific module device table as well to support module auto loading. This makes it possible to use the driver for AR9330 UART devices specified in device tree. Cc: devicetree@vger.kernel.org Signed-off-by: Gabor Juhos <juhosg@openwrt.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty')
-rw-r--r--drivers/tty/serial/ar933x_uart.c28
1 files changed, 25 insertions, 3 deletions
diff --git a/drivers/tty/serial/ar933x_uart.c b/drivers/tty/serial/ar933x_uart.c
index 0437a9e08d5..acd03af7cd5 100644
--- a/drivers/tty/serial/ar933x_uart.c
+++ b/drivers/tty/serial/ar933x_uart.c
@@ -17,6 +17,8 @@
#include <linux/sysrq.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/serial_core.h>
@@ -623,13 +625,24 @@ static int ar933x_uart_probe(struct platform_device *pdev)
struct uart_port *port;
struct resource *mem_res;
struct resource *irq_res;
+ struct device_node *np;
unsigned int baud;
int id;
int ret;
- id = pdev->id;
- if (id == -1)
- id = 0;
+ np = pdev->dev.of_node;
+ if (config_enabled(CONFIG_OF) && np) {
+ id = of_alias_get_id(np, "serial");
+ if (id < 0) {
+ dev_err(&pdev->dev, "unable to get alias id, err=%d\n",
+ id);
+ return id;
+ }
+ } else {
+ id = pdev->id;
+ if (id == -1)
+ id = 0;
+ }
if (id > CONFIG_SERIAL_AR933X_NR_UARTS)
return -EINVAL;
@@ -713,12 +726,21 @@ static int ar933x_uart_remove(struct platform_device *pdev)
return 0;
}
+#ifdef CONFIG_OF
+static const struct of_device_id ar933x_uart_of_ids[] = {
+ { .compatible = "qca,ar9330-uart" },
+ {},
+};
+MODULE_DEVICE_TABLE(of, ar933x_uart_of_ids);
+#endif
+
static struct platform_driver ar933x_uart_platform_driver = {
.probe = ar933x_uart_probe,
.remove = ar933x_uart_remove,
.driver = {
.name = DRIVER_NAME,
.owner = THIS_MODULE,
+ .of_match_table = of_match_ptr(ar933x_uart_of_ids),
},
};