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watchdog: xilinx: Add clock support 

Add support for the clock. Currently we enable
at probe and relinquish at remove.

Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Sören Brinkmann <soren.brinkmann@xilinx.com>
Signed-off-by: Shubhrajyoti Datta <shubhrajyoti.datta@xilinx.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
hifive-unleashed-5.1
Shubhrajyoti Datta 2016-08-12 12:17:01 +05:30 committed by Wim Van Sebroeck
parent d2a0015174
commit 9d6b4efc16
2 changed files with 26 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
Documentation/devicetree/bindings/watchdog/of-xilinx-wdt.txt
View File

@ -7,6 +7,8 @@ Required properties:
- reg : Physical base address and size
Optional properties:
- clocks : Input clock specifier. Refer to common clock
bindings.
- clock-frequency : Frequency of clock in Hz
- xlnx,wdt-enable-once : 0 - Watchdog can be restarted
1 - Watchdog can be enabled just once
@ -17,6 +19,7 @@ Example:
axi-timebase-wdt@40100000 {
clock-frequency = <50000000>;
compatible = "xlnx,xps-timebase-wdt-1.00.a";
clocks = <&clkc 15>;
reg = <0x40100000 0x10000>;
xlnx,wdt-enable-once = <0x0>;
xlnx,wdt-interval = <0x1b>;

25
drivers/watchdog/of_xilinx_wdt.c
View File

@ -10,6 +10,7 @@
* 2 of the License, or (at your option) any later version.
*/
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/module.h>
#include <linux/types.h>
@ -45,6 +46,7 @@ struct xwdt_device {
u32 wdt_interval;
spinlock_t spinlock;
struct watchdog_device xilinx_wdt_wdd;
struct clk *clk;
};
static int xilinx_wdt_start(struct watchdog_device *wdd)
@ -195,16 +197,30 @@ static int xwdt_probe(struct platform_device *pdev)
spin_lock_init(&xdev->spinlock);
watchdog_set_drvdata(xilinx_wdt_wdd, xdev);
xdev->clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(xdev->clk)) {
if (PTR_ERR(xdev->clk) == -ENOENT)
xdev->clk = NULL;
else
return PTR_ERR(xdev->clk);
}
rc = clk_prepare_enable(xdev->clk);
if (rc) {
dev_err(&pdev->dev, "unable to enable clock\n");
return rc;
}
rc = xwdt_selftest(xdev);
if (rc == XWT_TIMER_FAILED) {
dev_err(&pdev->dev, "SelfTest routine error\n");
return rc;
goto err_clk_disable;
}
rc = watchdog_register_device(xilinx_wdt_wdd);
if (rc) {
dev_err(&pdev->dev, "Cannot register watchdog (err=%d)\n", rc);
return rc;
goto err_clk_disable;
}
dev_info(&pdev->dev, "Xilinx Watchdog Timer at %p with timeout %ds\n",
@ -213,6 +229,10 @@ static int xwdt_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, xdev);
return 0;
err_clk_disable:
clk_disable_unprepare(xdev->clk);
return rc;
}
static int xwdt_remove(struct platform_device *pdev)
@ -220,6 +240,7 @@ static int xwdt_remove(struct platform_device *pdev)
struct xwdt_device *xdev = platform_get_drvdata(pdev);
watchdog_unregister_device(&xdev->xilinx_wdt_wdd);
clk_disable_unprepare(xdev->clk);
return 0;
}