* warranty of any kind, whether express or implied.
*/
+#include <linux/acpi.h>
#include <linux/device.h>
#include <linux/resource.h>
#include <linux/amba/bus.h>
#include <linux/math64.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
+#include <linux/of.h>
#include <linux/pm.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
spinlock_t lock;
void __iomem *base;
struct clk *clk;
+ u64 rate;
struct amba_device *adev;
unsigned int load_val;
};
struct sp805_wdt *wdt = watchdog_get_drvdata(wdd);
u64 load, rate;
- rate = clk_get_rate(wdt->clk);
+ rate = wdt->rate;
/*
* sp805 runs counter with given value twice, after the end of first
static unsigned int wdt_timeleft(struct watchdog_device *wdd)
{
struct sp805_wdt *wdt = watchdog_get_drvdata(wdd);
- u64 load, rate;
-
- rate = clk_get_rate(wdt->clk);
+ u64 load;
spin_lock(&wdt->lock);
load = readl_relaxed(wdt->base + WDTVALUE);
load += wdt->load_val + 1;
spin_unlock(&wdt->lock);
- return div_u64(load, rate);
+ return div_u64(load, wdt->rate);
}
static int
if (IS_ERR(wdt->base))
return PTR_ERR(wdt->base);
- wdt->clk = devm_clk_get(&adev->dev, NULL);
- if (IS_ERR(wdt->clk)) {
- dev_warn(&adev->dev, "Clock not found\n");
- ret = PTR_ERR(wdt->clk);
- goto err;
+ if (adev->dev.of_node) {
+ wdt->clk = devm_clk_get(&adev->dev, NULL);
+ if (IS_ERR(wdt->clk)) {
+ dev_err(&adev->dev, "Clock not found\n");
+ return PTR_ERR(wdt->clk);
+ }
+ wdt->rate = clk_get_rate(wdt->clk);
+ } else if (has_acpi_companion(&adev->dev)) {
+ /*
+ * When Driver probe with ACPI device, clock devices
+ * are not available, so watchdog rate get from
+ * clock-frequency property given in _DSD object.
+ */
+ device_property_read_u64(&adev->dev, "clock-frequency",
+ &wdt->rate);
+ if (!wdt->rate) {
+ dev_err(&adev->dev, "no clock-frequency property\n");
+ return -ENODEV;
+ }
}
wdt->adev = adev;