diff options
| author | Srinath Mannam <srinath.mannam@broadcom.com> | 2018-07-26 10:28:42 +0530 |
|---|---|---|
| committer | Wim Van Sebroeck <wim@linux-watchdog.org> | 2018-08-06 17:12:41 +0200 |
| commit | dc0e4a3bb7dcd087e9d338acbe6ef3f3667b278b (patch) | |
| tree | f5b98f1a67c19ab47e4f7742d6d11dc7d42f1b9e /drivers/watchdog/sp805_wdt.c | |
| parent | 81ceed41d0c2b2c9300de7bc30c1451680257f52 (diff) | |
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>
Diffstat (limited to 'drivers/watchdog/sp805_wdt.c')
| -rw-r--r-- | drivers/watchdog/sp805_wdt.c | 35 |
1 files changed, 25 insertions, 10 deletions
diff --git a/drivers/watchdog/sp805_wdt.c b/drivers/watchdog/sp805_wdt.c index b202138b7ecb..072986d461b7 100644 --- a/drivers/watchdog/sp805_wdt.c +++ b/drivers/watchdog/sp805_wdt.c @@ -11,6 +11,7 @@ * 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> @@ -22,6 +23,7 @@ #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> @@ -66,6 +68,7 @@ struct sp805_wdt { spinlock_t lock; void __iomem *base; struct clk *clk; + u64 rate; struct amba_device *adev; unsigned int load_val; }; @@ -90,7 +93,7 @@ static int wdt_setload(struct watchdog_device *wdd, unsigned int timeout) 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 @@ -116,9 +119,7 @@ static int wdt_setload(struct watchdog_device *wdd, unsigned int timeout) 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); @@ -128,7 +129,7 @@ static unsigned int wdt_timeleft(struct watchdog_device *wdd) load += wdt->load_val + 1; spin_unlock(&wdt->lock); - return div_u64(load, rate); + return div_u64(load, wdt->rate); } static int @@ -238,11 +239,25 @@ sp805_wdt_probe(struct amba_device *adev, const struct amba_id *id) 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; |