From 801cdffe68f3f2479e11e6704e3ac25fcb4b5a98 Mon Sep 17 00:00:00 2001 From: Guenter Roeck Date: Tue, 9 Apr 2019 10:23:48 -0700 Subject: [PATCH] watchdog: of_xilinx_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 - Introduce local variable 'struct device *dev' and use it instead of dereferencing it repeatedly - Use devm_watchdog_register_driver() to register watchdog device Cc: Michal Simek Signed-off-by: Guenter Roeck Acked-by: Michal Simek Signed-off-by: Wim Van Sebroeck --- drivers/watchdog/of_xilinx_wdt.c | 58 ++++++++++++++------------------ 1 file changed, 26 insertions(+), 32 deletions(-) diff --git a/drivers/watchdog/of_xilinx_wdt.c b/drivers/watchdog/of_xilinx_wdt.c index 5c977164b3e5..03786992b701 100644 --- a/drivers/watchdog/of_xilinx_wdt.c +++ b/drivers/watchdog/of_xilinx_wdt.c @@ -151,41 +151,46 @@ static u32 xwdt_selftest(struct xwdt_device *xdev) return XWT_TIMER_FAILED; } +static void xwdt_clk_disable_unprepare(void *data) +{ + clk_disable_unprepare(data); +} + static int xwdt_probe(struct platform_device *pdev) { + struct device *dev = &pdev->dev; int rc; u32 pfreq = 0, enable_once = 0; struct xwdt_device *xdev; struct watchdog_device *xilinx_wdt_wdd; - xdev = devm_kzalloc(&pdev->dev, sizeof(*xdev), GFP_KERNEL); + xdev = devm_kzalloc(dev, sizeof(*xdev), GFP_KERNEL); if (!xdev) return -ENOMEM; xilinx_wdt_wdd = &xdev->xilinx_wdt_wdd; xilinx_wdt_wdd->info = &xilinx_wdt_ident; xilinx_wdt_wdd->ops = &xilinx_wdt_ops; - xilinx_wdt_wdd->parent = &pdev->dev; + xilinx_wdt_wdd->parent = dev; xdev->base = devm_platform_ioremap_resource(pdev, 0); if (IS_ERR(xdev->base)) return PTR_ERR(xdev->base); - rc = of_property_read_u32(pdev->dev.of_node, "xlnx,wdt-interval", + rc = of_property_read_u32(dev->of_node, "xlnx,wdt-interval", &xdev->wdt_interval); if (rc) - dev_warn(&pdev->dev, - "Parameter \"xlnx,wdt-interval\" not found\n"); + dev_warn(dev, "Parameter \"xlnx,wdt-interval\" not found\n"); - rc = of_property_read_u32(pdev->dev.of_node, "xlnx,wdt-enable-once", + rc = of_property_read_u32(dev->of_node, "xlnx,wdt-enable-once", &enable_once); if (rc) - dev_warn(&pdev->dev, + dev_warn(dev, "Parameter \"xlnx,wdt-enable-once\" not found\n"); watchdog_set_nowayout(xilinx_wdt_wdd, enable_once); - xdev->clk = devm_clk_get(&pdev->dev, NULL); + xdev->clk = devm_clk_get(dev, NULL); if (IS_ERR(xdev->clk)) { if (PTR_ERR(xdev->clk) != -ENOENT) return PTR_ERR(xdev->clk); @@ -196,10 +201,10 @@ static int xwdt_probe(struct platform_device *pdev) */ xdev->clk = NULL; - rc = of_property_read_u32(pdev->dev.of_node, "clock-frequency", + rc = of_property_read_u32(dev->of_node, "clock-frequency", &pfreq); if (rc) - dev_warn(&pdev->dev, + dev_warn(dev, "The watchdog clock freq cannot be obtained\n"); } else { pfreq = clk_get_rate(xdev->clk); @@ -218,43 +223,33 @@ static int xwdt_probe(struct platform_device *pdev) rc = clk_prepare_enable(xdev->clk); if (rc) { - dev_err(&pdev->dev, "unable to enable clock\n"); + dev_err(dev, "unable to enable clock\n"); return rc; } + rc = devm_add_action_or_reset(dev, xwdt_clk_disable_unprepare, + xdev->clk); + if (rc) + return rc; rc = xwdt_selftest(xdev); if (rc == XWT_TIMER_FAILED) { - dev_err(&pdev->dev, "SelfTest routine error\n"); - goto err_clk_disable; + dev_err(dev, "SelfTest routine error\n"); + return rc; } - rc = watchdog_register_device(xilinx_wdt_wdd); + rc = devm_watchdog_register_device(dev, xilinx_wdt_wdd); if (rc) { - dev_err(&pdev->dev, "Cannot register watchdog (err=%d)\n", rc); - goto err_clk_disable; + dev_err(dev, "Cannot register watchdog (err=%d)\n", rc); + return rc; } clk_disable(xdev->clk); - dev_info(&pdev->dev, "Xilinx Watchdog Timer at %p with timeout %ds\n", + dev_info(dev, "Xilinx Watchdog Timer at %p with timeout %ds\n", xdev->base, xilinx_wdt_wdd->timeout); platform_set_drvdata(pdev, xdev); - return 0; -err_clk_disable: - clk_disable_unprepare(xdev->clk); - - return rc; -} - -static int xwdt_remove(struct platform_device *pdev) -{ - struct xwdt_device *xdev = platform_get_drvdata(pdev); - - watchdog_unregister_device(&xdev->xilinx_wdt_wdd); - clk_disable_unprepare(xdev->clk); - return 0; } @@ -303,7 +298,6 @@ MODULE_DEVICE_TABLE(of, xwdt_of_match); static struct platform_driver xwdt_driver = { .probe = xwdt_probe, - .remove = xwdt_remove, .driver = { .name = WATCHDOG_NAME, .of_match_table = xwdt_of_match,