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authorGuenter Roeck2019-04-08 21:38:37 +0200
committerWim Van Sebroeck2019-05-05 21:02:18 +0200
commitcecda01051e4ba585f35bb742158abfbe83b531a (patch)
tree749cb41bbf286f9483604bab969ccb043b9b168a /drivers/watchdog/davinci_wdt.c
parentwatchdog: da9063_wdt: Use 'dev' instead of dereferencing it repeatedly (diff)
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watchdog: davinci_wdt: Convert to use device managed functions and other improvements
Use device managed functions to simplify error handling, reduce source code size, improve readability, and reduce the likelyhood of bugs. Other improvements as listed below. The conversion was done automatically with coccinelle using the following semantic patches. The semantic patches and the scripts used to generate this commit log are available at https://github.com/groeck/coccinelle-patches - Drop assignments to otherwise unused variables - Drop unnecessary braces around conditional return statements - Drop empty remove function - Use devm_add_action_or_reset() for calls to clk_disable_unprepare - Use local variable 'struct device *dev' consistently - Use devm_watchdog_register_driver() to register watchdog device Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
Diffstat (limited to 'drivers/watchdog/davinci_wdt.c')
-rw-r--r--drivers/watchdog/davinci_wdt.c41
1 files changed, 16 insertions, 25 deletions
diff --git a/drivers/watchdog/davinci_wdt.c b/drivers/watchdog/davinci_wdt.c
index 7daa15df74a5..7b2ee35b5ffd 100644
--- a/drivers/watchdog/davinci_wdt.c
+++ b/drivers/watchdog/davinci_wdt.c
@@ -191,6 +191,11 @@ static const struct watchdog_ops davinci_wdt_ops = {
.restart = davinci_wdt_restart,
};
+static void davinci_clk_disable_unprepare(void *data)
+{
+ clk_disable_unprepare(data);
+}
+
static int davinci_wdt_probe(struct platform_device *pdev)
{
int ret = 0;
@@ -206,15 +211,19 @@ static int davinci_wdt_probe(struct platform_device *pdev)
if (IS_ERR(davinci_wdt->clk)) {
if (PTR_ERR(davinci_wdt->clk) != -EPROBE_DEFER)
- dev_err(&pdev->dev, "failed to get clock node\n");
+ dev_err(dev, "failed to get clock node\n");
return PTR_ERR(davinci_wdt->clk);
}
ret = clk_prepare_enable(davinci_wdt->clk);
if (ret) {
- dev_err(&pdev->dev, "failed to prepare clock\n");
+ dev_err(dev, "failed to prepare clock\n");
return ret;
}
+ ret = devm_add_action_or_reset(dev, davinci_clk_disable_unprepare,
+ davinci_wdt->clk);
+ if (ret)
+ return ret;
platform_set_drvdata(pdev, davinci_wdt);
@@ -224,7 +233,7 @@ static int davinci_wdt_probe(struct platform_device *pdev)
wdd->min_timeout = 1;
wdd->max_timeout = MAX_HEARTBEAT;
wdd->timeout = DEFAULT_HEARTBEAT;
- wdd->parent = &pdev->dev;
+ wdd->parent = dev;
watchdog_init_timeout(wdd, heartbeat, dev);
@@ -235,33 +244,16 @@ static int davinci_wdt_probe(struct platform_device *pdev)
watchdog_set_restart_priority(wdd, 128);
davinci_wdt->base = devm_platform_ioremap_resource(pdev, 0);
- if (IS_ERR(davinci_wdt->base)) {
- ret = PTR_ERR(davinci_wdt->base);
- goto err_clk_disable;
- }
+ if (IS_ERR(davinci_wdt->base))
+ return PTR_ERR(davinci_wdt->base);
- ret = watchdog_register_device(wdd);
+ ret = devm_watchdog_register_device(dev, wdd);
if (ret) {
dev_err(dev, "cannot register watchdog device\n");
- goto err_clk_disable;
+ return ret;
}
return 0;
-
-err_clk_disable:
- clk_disable_unprepare(davinci_wdt->clk);
-
- return ret;
-}
-
-static int davinci_wdt_remove(struct platform_device *pdev)
-{
- struct davinci_wdt_device *davinci_wdt = platform_get_drvdata(pdev);
-
- watchdog_unregister_device(&davinci_wdt->wdd);
- clk_disable_unprepare(davinci_wdt->clk);
-
- return 0;
}
static const struct of_device_id davinci_wdt_of_match[] = {
@@ -276,7 +268,6 @@ static struct platform_driver platform_wdt_driver = {
.of_match_table = davinci_wdt_of_match,
},
.probe = davinci_wdt_probe,
- .remove = davinci_wdt_remove,
};
module_platform_driver(platform_wdt_driver);