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authorGabor Juhos <juhosg@openwrt.org>2013-08-28 10:09:28 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-08-28 16:00:42 -0700
commit15ef17f622033455dcf03ae96256e474073a7b11 (patch)
treef3b0b6f88fffa9e9be3395d7b4d655767a608194 /drivers/tty/serial/ar933x_uart.c
parenta416bfa2a6b4e00a7bc69641b8fc2414873a5fd9 (diff)
downloadop-kernel-dev-15ef17f622033455dcf03ae96256e474073a7b11.zip
op-kernel-dev-15ef17f622033455dcf03ae96256e474073a7b11.tar.gz
tty: ar933x_uart: use the clk API to get the uart clock
The AR933x UARTs are only used on the Atheros AR933x SoCs. The base clock frequency of the UART is passed to the driver via platform data. The SoC support code implements the generic clock API, and the clock rate can be retrieved via that. Update the code to get the clock rate via the generic clock API instead of using the platform data. Signed-off-by: Gabor Juhos <juhosg@openwrt.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/serial/ar933x_uart.c')
-rw-r--r--drivers/tty/serial/ar933x_uart.c35
1 files changed, 26 insertions, 9 deletions
diff --git a/drivers/tty/serial/ar933x_uart.c b/drivers/tty/serial/ar933x_uart.c
index 78be13a..1052ee0 100644
--- a/drivers/tty/serial/ar933x_uart.c
+++ b/drivers/tty/serial/ar933x_uart.c
@@ -24,11 +24,11 @@
#include <linux/slab.h>
#include <linux/io.h>
#include <linux/irq.h>
+#include <linux/clk.h>
#include <asm/div64.h>
#include <asm/mach-ath79/ar933x_uart.h>
-#include <asm/mach-ath79/ar933x_uart_platform.h>
#define DRIVER_NAME "ar933x-uart"
@@ -47,6 +47,7 @@ struct ar933x_uart_port {
unsigned int ier; /* shadow Interrupt Enable Register */
unsigned int min_baud;
unsigned int max_baud;
+ struct clk *clk;
};
static inline unsigned int ar933x_uart_read(struct ar933x_uart_port *up,
@@ -622,7 +623,6 @@ static struct uart_driver ar933x_uart_driver = {
static int ar933x_uart_probe(struct platform_device *pdev)
{
- struct ar933x_uart_platform_data *pdata;
struct ar933x_uart_port *up;
struct uart_port *port;
struct resource *mem_res;
@@ -631,10 +631,6 @@ static int ar933x_uart_probe(struct platform_device *pdev)
int id;
int ret;
- pdata = dev_get_platdata(&pdev->dev);
- if (!pdata)
- return -EINVAL;
-
id = pdev->id;
if (id == -1)
id = 0;
@@ -653,6 +649,12 @@ static int ar933x_uart_probe(struct platform_device *pdev)
if (!up)
return -ENOMEM;
+ up->clk = devm_clk_get(&pdev->dev, "uart");
+ if (IS_ERR(up->clk)) {
+ dev_err(&pdev->dev, "unable to get UART clock\n");
+ return PTR_ERR(up->clk);
+ }
+
port = &up->port;
mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
@@ -660,13 +662,22 @@ static int ar933x_uart_probe(struct platform_device *pdev)
if (IS_ERR(port->membase))
return PTR_ERR(port->membase);
+ ret = clk_prepare_enable(up->clk);
+ if (ret)
+ return ret;
+
+ port->uartclk = clk_get_rate(up->clk);
+ if (!port->uartclk) {
+ ret = -EINVAL;
+ goto err_disable_clk;
+ }
+
port->mapbase = mem_res->start;
port->line = id;
port->irq = irq_res->start;
port->dev = &pdev->dev;
port->type = PORT_AR933X;
port->iotype = UPIO_MEM32;
- port->uartclk = pdata->uartclk;
port->regshift = 2;
port->fifosize = AR933X_UART_FIFO_SIZE;
@@ -682,10 +693,14 @@ static int ar933x_uart_probe(struct platform_device *pdev)
ret = uart_add_one_port(&ar933x_uart_driver, &up->port);
if (ret)
- return ret;
+ goto err_disable_clk;
platform_set_drvdata(pdev, up);
return 0;
+
+err_disable_clk:
+ clk_disable_unprepare(up->clk);
+ return ret;
}
static int ar933x_uart_remove(struct platform_device *pdev)
@@ -694,8 +709,10 @@ static int ar933x_uart_remove(struct platform_device *pdev)
up = platform_get_drvdata(pdev);
- if (up)
+ if (up) {
uart_remove_one_port(&ar933x_uart_driver, &up->port);
+ clk_disable_unprepare(up->clk);
+ }
return 0;
}
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