[PATCH v4 4/6] watchdog: rzg2l_wdt: Add error check for reset_control_deassert

[Biju Das <biju.das.jz@xxxxxxxxxxxxxx>]

If reset_control_deassert() fails, then we won't be able to
access the device registers. Therefore check the return code of
reset_control_deassert() and bailout in case of error.

While at it change reset_control_assert->reset_control_reset in
rzg2l_wdt_stop() and remove unnecessary reset_control_deassert()
from rzg2l_wdt_start().

Signed-off-by: Biju Das <biju.das.jz@xxxxxxxxxxxxxx>
---
v3->v4:
 * Made reset usage counter balanced
 * Updated commit description
v2->v3:
 * Patch reordering from Patch 2 -> Patch 3
 * Updated commit description
v1->v2:
 * Updated commit description and removed Rb tag from Guenter,
   since there is code change
 * Replaced reset_control_assert with reset_control_reset in stop
   and removed reset_control_deassert() from start.
---
 drivers/watchdog/rzg2l_wdt.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/watchdog/rzg2l_wdt.c b/drivers/watchdog/rzg2l_wdt.c
index 48dfe6e5e64f..73b667ed3e99 100644
--- a/drivers/watchdog/rzg2l_wdt.c
+++ b/drivers/watchdog/rzg2l_wdt.c
@@ -88,7 +88,6 @@ static int rzg2l_wdt_start(struct watchdog_device *wdev)
 {
 	struct rzg2l_wdt_priv *priv = watchdog_get_drvdata(wdev);
 
-	reset_control_deassert(priv->rstc);
 	pm_runtime_get_sync(wdev->parent);
 
 	/* Initialize time out */
@@ -108,7 +107,7 @@ static int rzg2l_wdt_stop(struct watchdog_device *wdev)
 	struct rzg2l_wdt_priv *priv = watchdog_get_drvdata(wdev);
 
 	pm_runtime_put(wdev->parent);
-	reset_control_assert(priv->rstc);
+	reset_control_reset(priv->rstc);
 
 	return 0;
 }
@@ -204,7 +203,10 @@ static int rzg2l_wdt_probe(struct platform_device *pdev)
 		return dev_err_probe(&pdev->dev, PTR_ERR(priv->rstc),
 				     "failed to get cpg reset");
 
-	reset_control_deassert(priv->rstc);
+	ret = reset_control_deassert(priv->rstc);
+	if (ret)
+		return dev_err_probe(dev, ret, "failed to deassert");
+
 	pm_runtime_enable(&pdev->dev);
 
 	priv->wdev.info = &rzg2l_wdt_ident;
-- 
2.17.1