2 files changed, 27 insertions, 10 deletions

diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
index f136248..3c598e3 100644
--- a/drivers/tty/serial/Kconfig
+++ b/drivers/tty/serial/Kconfig
@@ -1402,7 +1402,7 @@ config SERIAL_XILINX_PS_UART_CONSOLE
 
 config SERIAL_AR933X
 	bool "AR933X serial port support"
-	depends on SOC_AR933X
+	depends on HAVE_CLK && SOC_AR933X
 	select SERIAL_CORE
 	help
 	  If you have an Atheros AR933X SOC based board and want to use the
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;
 }