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watchdog: renesas_wdt: consistently use RuntimePM for clock management 

On Renesas R-Car archs, RuntimePM does all the clock handling. So, use
it consistently to enable/disable the clocks. Also make sure that clocks
are really enabled around clk_get_rate(). clk_summary looks proper now:

		clock	enable_cnt	prepare_cnt	rate ...
Before this commit:

At boot:	rwdt	1		1		32768 0 0
WDT running:	rwdt	2		2		32768 0 0

After this commit:

At boot:	rwdt	0		1		32768 0 0
WDT running	rwdt	1		1		32768 0 0

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
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>
This commit is contained in:
Wolfram Sang 2017-07-26 23:54:37 +02:00 committed by Wim Van Sebroeck
parent 012c04601f
commit 3be42941dd
1 changed files with 19 additions and 14 deletions
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33
drivers/watchdog/renesas_wdt.c
View File

@ -76,7 +76,7 @@ static int rwdt_start(struct watchdog_device *wdev)
{
struct rwdt_priv *priv = watchdog_get_drvdata(wdev);
clk_prepare_enable(priv->clk);
pm_runtime_get_sync(wdev->parent);
rwdt_write(priv, 0, RWTCSRB);
rwdt_write(priv, priv->cks, RWTCSRA);
@ -95,7 +95,7 @@ static int rwdt_stop(struct watchdog_device *wdev)
struct rwdt_priv *priv = watchdog_get_drvdata(wdev);
rwdt_write(priv, priv->cks, RWTCSRA);
clk_disable_unprepare(priv->clk);
pm_runtime_put(wdev->parent);
return 0;
}
@ -141,9 +141,16 @@ static int rwdt_probe(struct platform_device *pdev)
if (IS_ERR(priv->clk))
return PTR_ERR(priv->clk);
pm_runtime_enable(&pdev->dev);
pm_runtime_get_sync(&pdev->dev);
priv->clk_rate = clk_get_rate(priv->clk);
if (!priv->clk_rate)
return -ENOENT;
pm_runtime_put(&pdev->dev);
if (!priv->clk_rate) {
ret = -ENOENT;
goto out_pm_disable;
}
for (i = ARRAY_SIZE(clk_divs) - 1; i >= 0; i--) {
clks_per_sec = priv->clk_rate / clk_divs[i];
@ -155,12 +162,10 @@ static int rwdt_probe(struct platform_device *pdev)
if (i < 0) {
dev_err(&pdev->dev, "Can't find suitable clock divider\n");
return -ERANGE;
ret = -ERANGE;
goto out_pm_disable;
}
pm_runtime_enable(&pdev->dev);
pm_runtime_get_sync(&pdev->dev);
priv->wdev.info = &rwdt_ident,
priv->wdev.ops = &rwdt_ops,
priv->wdev.parent = &pdev->dev;
@ -178,13 +183,14 @@ static int rwdt_probe(struct platform_device *pdev)
dev_warn(&pdev->dev, "Specified timeout value invalid, using default\n");
ret = watchdog_register_device(&priv->wdev);
if (ret < 0) {
pm_runtime_put(&pdev->dev);
pm_runtime_disable(&pdev->dev);
return ret;
}
if (ret < 0)
goto out_pm_disable;
return 0;
out_pm_disable:
pm_runtime_disable(&pdev->dev);
return ret;
}
static int rwdt_remove(struct platform_device *pdev)
@ -192,7 +198,6 @@ static int rwdt_remove(struct platform_device *pdev)
struct rwdt_priv *priv = platform_get_drvdata(pdev);
watchdog_unregister_device(&priv->wdev);
pm_runtime_put(&pdev->dev);
pm_runtime_disable(&pdev->dev);
return 0;