diff options
| author | Alexandre Belloni <alexandre.belloni@free-electrons.com> | 2015-08-16 11:23:43 +0200 |
|---|---|---|
| committer | Wim Van Sebroeck <wim@iguana.be> | 2015-09-09 21:38:52 +0200 |
| commit | a97a09bd119fbdf4ba8c634fed8f4148d1def1e0 (patch) | |
| tree | 90af60d8025852168cf758f7b4f9499e058339aa | |
| parent | f4fff94e3e3a712ef062c44b64ecf8f552f48ea4 (diff) | |
watchdog: at91sam9: get and use slow clock
Commit dca1a4b5ff6e ("clk: at91: keep slow clk enabled to prevent system
hang") added a workaround for the slow clock as it is not properly handled
by its users.
Get and use the slow clock as it is necessary for the at91sam9 watchdog.
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
| -rw-r--r-- | drivers/watchdog/at91sam9_wdt.c | 22 |
1 files changed, 20 insertions, 2 deletions
diff --git a/drivers/watchdog/at91sam9_wdt.c b/drivers/watchdog/at91sam9_wdt.c index e4698f7c5f93..7e6acaf3ece4 100644 --- a/drivers/watchdog/at91sam9_wdt.c +++ b/drivers/watchdog/at91sam9_wdt.c @@ -17,6 +17,7 @@ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt +#include <linux/clk.h> #include <linux/errno.h> #include <linux/init.h> #include <linux/interrupt.h> @@ -90,6 +91,7 @@ struct at91wdt { unsigned long heartbeat; /* WDT heartbeat in jiffies */ bool nowayout; unsigned int irq; + struct clk *sclk; }; /* ......................................................................... */ @@ -352,15 +354,25 @@ static int __init at91wdt_probe(struct platform_device *pdev) if (IS_ERR(wdt->base)) return PTR_ERR(wdt->base); + wdt->sclk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(wdt->sclk)) + return PTR_ERR(wdt->sclk); + + err = clk_prepare_enable(wdt->sclk); + if (err) { + dev_err(&pdev->dev, "Could not enable slow clock\n"); + return err; + } + if (pdev->dev.of_node) { err = of_at91wdt_init(pdev->dev.of_node, wdt); if (err) - return err; + goto err_clk; } err = at91_wdt_init(pdev, wdt); if (err) - return err; + goto err_clk; platform_set_drvdata(pdev, wdt); @@ -368,6 +380,11 @@ static int __init at91wdt_probe(struct platform_device *pdev) wdt->wdd.timeout, wdt->nowayout); return 0; + +err_clk: + clk_disable_unprepare(wdt->sclk); + + return err; } static int __exit at91wdt_remove(struct platform_device *pdev) @@ -377,6 +394,7 @@ static int __exit at91wdt_remove(struct platform_device *pdev) pr_warn("I quit now, hardware will probably reboot!\n"); del_timer(&wdt->timer); + clk_disable_unprepare(wdt->sclk); return 0; } |