Commit 3be42941 authored by Wolfram Sang's avatar Wolfram Sang Committed by Wim Van Sebroeck
Browse files

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: default avatarWolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: default avatarGeert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: default avatarGuenter Roeck <linux@roeck-us.net>
Signed-off-by: default avatarGuenter Roeck <linux@roeck-us.net>
Signed-off-by: default avatarWim Van Sebroeck <wim@iguana.be>
parent 012c0460

drivers/watchdog/renesas_wdt.c

+19 −14
Original line number Diff line number Diff line
@@ -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;

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