diff mbox series

[12/22] watchdog: zx2967_wdt: Convert to use device managed functions and other improvements

Message ID 1554913683-25454-13-git-send-email-linux@roeck-us.net (mailing list archive)
State Accepted
Headers show
Series watchdog: Expand use of device managed functions (series 3 of 3) | expand

Commit Message

Guenter Roeck April 10, 2019, 4:27 p.m. UTC 
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 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

Cc: Jun Nie <jun.nie@linaro.org>
Cc: Shawn Guo <shawnguo@kernel.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
---
 drivers/watchdog/zx2967_wdt.c | 33 +++++++++++++--------------------
 1 file changed, 13 insertions(+), 20 deletions(-)

Comments

Shawn Guo April 11, 2019, 8:53 a.m. UTC | #1 
On Wed, Apr 10, 2019 at 09:27:53AM -0700, Guenter Roeck wrote:
> 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 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
> 
> Cc: Jun Nie <jun.nie@linaro.org>
> Cc: Shawn Guo <shawnguo@kernel.org>
> Signed-off-by: Guenter Roeck <linux@roeck-us.net>

Acked-by: Shawn Guo <shawnguo@kernel.org>
diff mbox series

Patch

diff --git a/drivers/watchdog/zx2967_wdt.c b/drivers/watchdog/zx2967_wdt.c
index 9ccc83f526f3..c8549bf07cc9 100644
--- a/drivers/watchdog/zx2967_wdt.c
+++ b/drivers/watchdog/zx2967_wdt.c
@@ -188,6 +188,11 @@  static void zx2967_wdt_reset_sysctrl(struct device *dev)
 	of_node_put(out_args.np);
 }
 
+static void zx2967_clk_disable_unprepare(void *data)
+{
+	clk_disable_unprepare(data);
+}
+
 static int zx2967_wdt_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
@@ -206,7 +211,7 @@  static int zx2967_wdt_probe(struct platform_device *pdev)
 	wdt->wdt_device.timeout = ZX2967_WDT_DEFAULT_TIMEOUT;
 	wdt->wdt_device.max_timeout = ZX2967_WDT_MAX_TIMEOUT;
 	wdt->wdt_device.min_timeout = ZX2967_WDT_MIN_TIMEOUT;
-	wdt->wdt_device.parent = &pdev->dev;
+	wdt->wdt_device.parent = dev;
 
 	wdt->reg_base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(wdt->reg_base))
@@ -225,13 +230,16 @@  static int zx2967_wdt_probe(struct platform_device *pdev)
 		dev_err(dev, "failed to enable clock\n");
 		return ret;
 	}
+	ret = devm_add_action_or_reset(dev, zx2967_clk_disable_unprepare,
+				       wdt->clock);
+	if (ret)
+		return ret;
 	clk_set_rate(wdt->clock, ZX2967_WDT_CLK_FREQ);
 
 	rstc = devm_reset_control_get_exclusive(dev, NULL);
 	if (IS_ERR(rstc)) {
 		dev_err(dev, "failed to get rstc");
-		ret = PTR_ERR(rstc);
-		goto err;
+		return PTR_ERR(rstc);
 	}
 
 	reset_control_assert(rstc);
@@ -242,28 +250,14 @@  static int zx2967_wdt_probe(struct platform_device *pdev)
 			ZX2967_WDT_DEFAULT_TIMEOUT, dev);
 	watchdog_set_nowayout(&wdt->wdt_device, WATCHDOG_NOWAYOUT);
 
-	ret = watchdog_register_device(&wdt->wdt_device);
+	ret = devm_watchdog_register_device(dev, &wdt->wdt_device);
 	if (ret)
-		goto err;
+		return ret;
 
 	dev_info(dev, "watchdog enabled (timeout=%d sec, nowayout=%d)",
 		 wdt->wdt_device.timeout, WATCHDOG_NOWAYOUT);
 
 	return 0;
-
-err:
-	clk_disable_unprepare(wdt->clock);
-	return ret;
-}
-
-static int zx2967_wdt_remove(struct platform_device *pdev)
-{
-	struct zx2967_wdt *wdt = platform_get_drvdata(pdev);
-
-	watchdog_unregister_device(&wdt->wdt_device);
-	clk_disable_unprepare(wdt->clock);
-
-	return 0;
 }
 
 static const struct of_device_id zx2967_wdt_match[] = {
@@ -274,7 +268,6 @@  MODULE_DEVICE_TABLE(of, zx2967_wdt_match);
 
 static struct platform_driver zx2967_wdt_driver = {
 	.probe		= zx2967_wdt_probe,
-	.remove		= zx2967_wdt_remove,
 	.driver		= {
 		.name	= "zx2967-wdt",
 		.of_match_table	= of_match_ptr(zx2967_wdt_match),