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watchdog: bcm2835_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
- Replace of_iomap() with platform_get_resource() followed by
  devm_ioremap_resource()
- Replace &pdev->dev with dev if 'struct device *dev' is a declared
  variable
- Use devm_watchdog_register_driver() to register watchdog device
- Replace shutdown function with call to watchdog_stop_on_reboot()

Cc: Stephen Warren <swarren@wwwdotorg.org>
Cc: Lee Jones <lee@kernel.org>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: Ray Jui <rjui@broadcom.com>
Cc: Scott Branden <sbranden@broadcom.com>
Acked-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Guenter Roeck 2017-01-10 15:21:45 -08:00
parent cb5c14ea57
commit 5f5aa6f10a
1 changed files with 8 additions and 19 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

27
drivers/watchdog/bcm2835_wdt.c
View File

@ -172,8 +172,8 @@ static void bcm2835_power_off(void)
static int bcm2835_wdt_probe(struct platform_device *pdev)
{
struct resource *res;
struct device *dev = &pdev->dev;
struct device_node *np = dev->of_node;
struct bcm2835_wdt *wdt;
int err;
@ -184,16 +184,15 @@ static int bcm2835_wdt_probe(struct platform_device *pdev)
spin_lock_init(&wdt->lock);
wdt->base = of_iomap(np, 0);
if (!wdt->base) {
dev_err(dev, "Failed to remap watchdog regs");
return -ENODEV;
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
wdt->base = devm_ioremap_resource(dev, res);
if (IS_ERR(wdt->base))
return PTR_ERR(wdt->base);
watchdog_set_drvdata(&bcm2835_wdt_wdd, wdt);
watchdog_init_timeout(&bcm2835_wdt_wdd, heartbeat, dev);
watchdog_set_nowayout(&bcm2835_wdt_wdd, nowayout);
bcm2835_wdt_wdd.parent = &pdev->dev;
bcm2835_wdt_wdd.parent = dev;
if (bcm2835_wdt_is_running(wdt)) {
/*
* The currently active timeout value (set by the
@ -208,10 +207,10 @@ static int bcm2835_wdt_probe(struct platform_device *pdev)
watchdog_set_restart_priority(&bcm2835_wdt_wdd, 128);
err = watchdog_register_device(&bcm2835_wdt_wdd);
watchdog_stop_on_reboot(&bcm2835_wdt_wdd);
err = devm_watchdog_register_device(dev, &bcm2835_wdt_wdd);
if (err) {
dev_err(dev, "Failed to register watchdog device");
iounmap(wdt->base);
return err;
}
@ -224,21 +223,12 @@ static int bcm2835_wdt_probe(struct platform_device *pdev)
static int bcm2835_wdt_remove(struct platform_device *pdev)
{
struct bcm2835_wdt *wdt = platform_get_drvdata(pdev);
if (pm_power_off == bcm2835_power_off)
pm_power_off = NULL;
watchdog_unregister_device(&bcm2835_wdt_wdd);
iounmap(wdt->base);
return 0;
}
static void bcm2835_wdt_shutdown(struct platform_device *pdev)
{
bcm2835_wdt_stop(&bcm2835_wdt_wdd);
}
static const struct of_device_id bcm2835_wdt_of_match[] = {
{ .compatible = "brcm,bcm2835-pm-wdt", },
{},
@ -248,7 +238,6 @@ MODULE_DEVICE_TABLE(of, bcm2835_wdt_of_match);
static struct platform_driver bcm2835_wdt_driver = {
.probe = bcm2835_wdt_probe,
.remove = bcm2835_wdt_remove,
.shutdown = bcm2835_wdt_shutdown,
.driver = {
.name = "bcm2835-wdt",
.of_match_table = bcm2835_wdt_of_match,