xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

serial: xilinx_uartps: Get clock rate info from dts

Browse Source 
Add support for specifying clock information for the uart clk via the
device tree. This eliminates the need to hardcode rates in the device
tree.

Signed-off-by: Josh Cartwright <josh.cartwright@ni.com>
Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Acked-by: Michal Simek <michal.simek@xilinx.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Josh Cartwright
2013-01-21 19:57:41 +01:00
committed by Greg Kroah-Hartman
parent 1f9db0921f
commit 2326669ccb
2 changed files with 21 additions and 17 deletions
Download Patch File Download Diff File Expand all files Collapse all files

34
drivers/tty/serial/xilinx_uartps.c
View File

@@ -17,6 +17,7 @@
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/console.h>
#include <linux/clk.h>
#include <linux/irq.h>
#include <linux/io.h>
#include <linux/of.h>
@@ -936,16 +937,18 @@ static int xuartps_probe(struct platform_device *pdev)
int rc;
struct uart_port *port;
struct resource *res, *res2;
int clk = 0;
struct clk *clk;
const unsigned int *prop;
prop = of_get_property(pdev->dev.of_node, "clock", NULL);
if (prop)
clk = be32_to_cpup(prop);
if (!clk) {
clk = of_clk_get(pdev->dev.of_node, 0);
if (IS_ERR(clk)) {
dev_err(&pdev->dev, "no clock specified\n");
return -ENODEV;
return PTR_ERR(clk);
}
rc = clk_prepare_enable(clk);
if (rc) {
dev_err(&pdev->dev, "could not enable clock\n");
return -EBUSY;
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
@@ -970,7 +973,8 @@ static int xuartps_probe(struct platform_device *pdev)
port->mapbase = res->start;
port->irq = res2->start;
port->dev = &pdev->dev;
port->uartclk = clk;
port->uartclk = clk_get_rate(clk);
port->private_data = clk;
dev_set_drvdata(&pdev->dev, port);
rc = uart_add_one_port(&xuartps_uart_driver, port);
if (rc) {
@@ -992,14 +996,14 @@ static int xuartps_probe(struct platform_device *pdev)
static int xuartps_remove(struct platform_device *pdev)
{
struct uart_port *port = dev_get_drvdata(&pdev->dev);
int rc = 0;
struct clk *clk = port->private_data;
int rc;
/* Remove the xuartps port from the serial core */
if (port) {
rc = uart_remove_one_port(&xuartps_uart_driver, port);
dev_set_drvdata(&pdev->dev, NULL);
port->mapbase = 0;
}
rc = uart_remove_one_port(&xuartps_uart_driver, port);
dev_set_drvdata(&pdev->dev, NULL);
port->mapbase = 0;
clk_disable_unprepare(clk);
return rc;
}