watchdog: dw_wdt: get reset lines from dt

The dw_wdt has an external reset line, that can keep the device in reset
and therefore rendering it useless and also is the only way of stopping
the watchdog once it was started.

Get the reset lines for this core from the devicetree. As these lines are
optional, use devm_reset_control_get_optional_shared. If the reset line
is not specified in the devicetree, the reset framework will just skip
deasserting and continue.
This way all users of the driver will continue to function without
any harm, even if the reset line is not specified in the devicetree.

Signed-off-by: Steffen Trumtrar <s.trumtrar@pengutronix.de>
Cc: linux-watchdog@vger.kernel.org
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>

diff --git a/drivers/watchdog/dw_wdt.c b/drivers/watchdog/dw_wdt.c
index 914da3a..36be987 100644 (file)
--- a/drivers/watchdog/dw_wdt.c
+++ b/drivers/watchdog/dw_wdt.c
@@ -29,6 +29,7 @@
 #include <linux/of.h>
 #include <linux/pm.h>
 #include <linux/platform_device.h>
+#include <linux/reset.h>
 #include <linux/watchdog.h>
 
 #define WDOG_CONTROL_REG_OFFSET                    0x00
@@ -54,6 +55,7 @@ struct dw_wdt {
        struct clk              *clk;
        unsigned long           rate;
        struct watchdog_device  wdd;
+       struct reset_control    *rst;
 };
 
 #define to_dw_wdt(wdd) container_of(wdd, struct dw_wdt, wdd)
@@ -234,6 +236,14 @@ static int dw_wdt_drv_probe(struct platform_device *pdev)
                goto out_disable_clk;
        }
 
+       dw_wdt->rst = devm_reset_control_get_optional_shared(&pdev->dev, NULL);
+       if (IS_ERR(dw_wdt->rst)) {
+               ret = PTR_ERR(dw_wdt->rst);
+               goto out_disable_clk;
+       }
+
+       reset_control_deassert(dw_wdt->rst);
+
        wdd = &dw_wdt->wdd;
        wdd->info = &dw_wdt_ident;
        wdd->ops = &dw_wdt_ops;
@@ -279,6 +289,7 @@ static int dw_wdt_drv_remove(struct platform_device *pdev)
        struct dw_wdt *dw_wdt = platform_get_drvdata(pdev);
 
        watchdog_unregister_device(&dw_wdt->wdd);
+       reset_control_assert(dw_wdt->rst);
        clk_disable_unprepare(dw_wdt->clk);
 
        return 0;