From 6ba3793cc1e705715a02eeef6460e07812c7e8da Mon Sep 17 00:00:00 2001 From: Guenter Roeck Date: Wed, 10 Apr 2019 09:27:53 -0700 Subject: [PATCH] watchdog: zx2967_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 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 Cc: Shawn Guo Signed-off-by: Guenter Roeck Acked-by: Shawn Guo Signed-off-by: Wim Van Sebroeck --- drivers/watchdog/zx2967_wdt.c | 33 +++++++++++++-------------------- 1 file changed, 13 insertions(+), 20 deletions(-) diff --git a/drivers/watchdog/zx2967_wdt.c b/drivers/watchdog/zx2967_wdt.c index 9ccc83f..c8549bf0 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), -- 2.7.4