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watchdog: sp805: Add clock-frequency property
Use clock-frequency property given in _DSD object of ACPI device to calculate Watchdog rate as binding clock devices are not available as device tree. Note: There is no formal review process for _DSD properties Signed-off-by: Srinath Mannam <srinath.mannam@broadcom.com> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Reviewed-by: Ray Jui <ray.jui@broadcom.com> Reviewed-by: Scott Branden <scott.branden@broadcom.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
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1 changed files with 25 additions and 10 deletions
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@ -11,6 +11,7 @@
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* warranty of any kind, whether express or implied.
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*/
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#include <linux/acpi.h>
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#include <linux/device.h>
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#include <linux/resource.h>
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#include <linux/amba/bus.h>
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@ -22,6 +23,7 @@
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#include <linux/math64.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/of.h>
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#include <linux/pm.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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@ -66,6 +68,7 @@ struct sp805_wdt {
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spinlock_t lock;
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void __iomem *base;
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struct clk *clk;
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u64 rate;
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struct amba_device *adev;
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unsigned int load_val;
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};
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@ -90,7 +93,7 @@ static int wdt_setload(struct watchdog_device *wdd, unsigned int timeout)
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struct sp805_wdt *wdt = watchdog_get_drvdata(wdd);
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u64 load, rate;
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rate = clk_get_rate(wdt->clk);
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rate = wdt->rate;
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/*
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* sp805 runs counter with given value twice, after the end of first
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@ -116,9 +119,7 @@ static int wdt_setload(struct watchdog_device *wdd, unsigned int timeout)
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static unsigned int wdt_timeleft(struct watchdog_device *wdd)
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{
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struct sp805_wdt *wdt = watchdog_get_drvdata(wdd);
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u64 load, rate;
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rate = clk_get_rate(wdt->clk);
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u64 load;
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spin_lock(&wdt->lock);
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load = readl_relaxed(wdt->base + WDTVALUE);
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@ -128,7 +129,7 @@ static unsigned int wdt_timeleft(struct watchdog_device *wdd)
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load += wdt->load_val + 1;
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spin_unlock(&wdt->lock);
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return div_u64(load, rate);
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return div_u64(load, wdt->rate);
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}
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static int
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@ -238,11 +239,25 @@ sp805_wdt_probe(struct amba_device *adev, const struct amba_id *id)
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if (IS_ERR(wdt->base))
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return PTR_ERR(wdt->base);
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if (adev->dev.of_node) {
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wdt->clk = devm_clk_get(&adev->dev, NULL);
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if (IS_ERR(wdt->clk)) {
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dev_warn(&adev->dev, "Clock not found\n");
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ret = PTR_ERR(wdt->clk);
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goto err;
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dev_err(&adev->dev, "Clock not found\n");
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return PTR_ERR(wdt->clk);
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}
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wdt->rate = clk_get_rate(wdt->clk);
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} else if (has_acpi_companion(&adev->dev)) {
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/*
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* When Driver probe with ACPI device, clock devices
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* are not available, so watchdog rate get from
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* clock-frequency property given in _DSD object.
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*/
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device_property_read_u64(&adev->dev, "clock-frequency",
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&wdt->rate);
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if (!wdt->rate) {
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dev_err(&adev->dev, "no clock-frequency property\n");
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return -ENODEV;
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}
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}
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wdt->adev = adev;
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