From: Emilio López <emilio@xxxxxxxxxxxxx>
This commit implements support for using the "clocks" DT property, instead
of having to use clock-frequency.
Signed-off-by: Emilio López <emilio@xxxxxxxxxxxxx>
---
drivers/tty/serial/8250/8250_dw.c | 32 ++++++++++++++++++++++----------
1 file changed, 22 insertions(+), 10 deletions(-)
diff --git a/drivers/tty/serial/8250/8250_dw.c b/drivers/tty/serial/8250/8250_dw.c
index db0e66f..8f03800 100644
--- a/drivers/tty/serial/8250/8250_dw.c
+++ b/drivers/tty/serial/8250/8250_dw.c
@@ -26,6 +26,7 @@
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/acpi.h>
+#include <linux/clk.h>
#include "8250.h"
@@ -55,8 +56,9 @@
struct dw8250_data {
- int last_lcr;
- int line;
+ int last_lcr;
+ int line;
+ struct clk *clk;
};
static void dw8250_serial_out(struct uart_port *p, int offset, int value)
@@ -116,6 +118,7 @@ static int dw8250_handle_irq(struct uart_port *p)
static int dw8250_probe_of(struct uart_port *p)
{
struct device_node *np = p->dev->of_node;
+ struct dw8250_data *data = p->private_data;
u32 val;
if (!of_property_read_u32(np, "reg-io-width", &val)) {
@@ -137,8 +140,15 @@ static int dw8250_probe_of(struct uart_port *p)
p->regshift = val;
if (of_property_read_u32(np, "clock-frequency", &val)) {
- dev_err(p->dev, "no clock-frequency property set\n");
- return -EINVAL;
+ /* Get clk rate through clk driver if present */
+ data->clk = clk_get(p->dev, NULL);
+ if (IS_ERR(data->clk)) {
+ dev_err(p->dev, "clk or clock-frequency not defined\n");
+ return -EINVAL;
+ }
+
+ clk_prepare_enable(data->clk);
+ val = clk_get_rate(data->clk);
}
p->uartclk = val;
@@ -300,6 +310,12 @@ static int dw8250_probe(struct platform_device *pdev)
dw8250_setup_port(&uart);
+ data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ uart.port.private_data = data;
+
if (pdev->dev.of_node) {
err = dw8250_probe_of(&uart.port);
if (err)
@@ -312,12 +328,6 @@ static int dw8250_probe(struct platform_device *pdev)
return -ENODEV;
}
- data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
- if (!data)
- return -ENOMEM;
-
- uart.port.private_data = data;
-
data->line = serial8250_register_8250_port(&uart);
if (data->line < 0)
return data->line;
@@ -333,6 +343,8 @@ static int dw8250_remove(struct platform_device *pdev)
serial8250_unregister_port(data->line);
+ clk_disable_unprepare(data->clk);
+
return 0;
}
--
1.7.10.4
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