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authorTobias Klauser <tklauser@distanz.ch>2011-02-18 13:35:32 +0300
committerGrant Likely <grant.likely@secretlab.ca>2011-03-01 19:38:27 +0300
commit7c9325d79a3c3d51c98812161d47876d6830c062 (patch)
treee749efa50ac29719d4ff159f94f03abc455cee06 /drivers/tty
parentd714d1979d7b4df7e2c127407f4014ce71f73cd0 (diff)
downloadlinux-7c9325d79a3c3d51c98812161d47876d6830c062.tar.xz
tty: serial: altera_uart: Add devicetree support
With the recent switch of the (currently still out-of-tree) Nios2 Linux port to devicetree we want to be able to retrieve the resources and properties from dts. The old method to retrieve resources and properties from platform data is still supported. Signed-off-by: Tobias Klauser <tklauser@distanz.ch> Acked-by: Greg Kroah-Hartman <gregkh@suse.de> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Diffstat (limited to 'drivers/tty')
-rw-r--r--drivers/tty/serial/altera_uart.c51
1 files changed, 47 insertions, 4 deletions
diff --git a/drivers/tty/serial/altera_uart.c b/drivers/tty/serial/altera_uart.c
index 721216292a50..1803c37d58ab 100644
--- a/drivers/tty/serial/altera_uart.c
+++ b/drivers/tty/serial/altera_uart.c
@@ -24,6 +24,7 @@
#include <linux/serial.h>
#include <linux/serial_core.h>
#include <linux/platform_device.h>
+#include <linux/of.h>
#include <linux/io.h>
#include <linux/altera_uart.h>
@@ -511,6 +512,29 @@ static struct uart_driver altera_uart_driver = {
.cons = ALTERA_UART_CONSOLE,
};
+#ifdef CONFIG_OF
+static int altera_uart_get_of_uartclk(struct platform_device *pdev,
+ struct uart_port *port)
+{
+ int len;
+ const __be32 *clk;
+
+ clk = of_get_property(pdev->dev.of_node, "clock-frequency", &len);
+ if (!clk || len < sizeof(__be32))
+ return -ENODEV;
+
+ port->uartclk = be32_to_cpup(clk);
+
+ return 0;
+}
+#else
+static int altera_uart_get_of_uartclk(struct platform_device *pdev,
+ struct uart_port *port)
+{
+ return -ENODEV;
+}
+#endif /* CONFIG_OF */
+
static int __devinit altera_uart_probe(struct platform_device *pdev)
{
struct altera_uart_platform_uart *platp = pdev->dev.platform_data;
@@ -518,6 +542,7 @@ static int __devinit altera_uart_probe(struct platform_device *pdev)
struct resource *res_mem;
struct resource *res_irq;
int i = pdev->id;
+ int ret;
/* -1 emphasizes that the platform must have one port, no .N suffix */
if (i == -1)
@@ -542,6 +567,15 @@ static int __devinit altera_uart_probe(struct platform_device *pdev)
else if (platp->irq)
port->irq = platp->irq;
+ /* Check platform data first so we can override device node data */
+ if (platp)
+ port->uartclk = platp->uartclk;
+ else {
+ ret = altera_uart_get_of_uartclk(pdev, port);
+ if (ret)
+ return ret;
+ }
+
port->membase = ioremap(port->mapbase, ALTERA_UART_SIZE);
if (!port->membase)
return -ENOMEM;
@@ -549,7 +583,6 @@ static int __devinit altera_uart_probe(struct platform_device *pdev)
port->line = i;
port->type = PORT_ALTERA_UART;
port->iotype = SERIAL_IO_MEM;
- port->uartclk = platp->uartclk;
port->ops = &altera_uart_ops;
port->flags = UPF_BOOT_AUTOCONF;
port->private_data = platp;
@@ -567,13 +600,23 @@ static int __devexit altera_uart_remove(struct platform_device *pdev)
return 0;
}
+#ifdef CONFIG_OF
+static struct of_device_id altera_uart_match[] = {
+ { .compatible = "ALTR,uart-1.0", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, altera_uart_match);
+#else
+#define altera_uart_match NULL
+#endif /* CONFIG_OF */
+
static struct platform_driver altera_uart_platform_driver = {
.probe = altera_uart_probe,
.remove = __devexit_p(altera_uart_remove),
.driver = {
- .name = DRV_NAME,
- .owner = THIS_MODULE,
- .pm = NULL,
+ .name = DRV_NAME,
+ .owner = THIS_MODULE,
+ .of_match_table = altera_uart_match,
},
};