add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/watchdog/imx2_wdt.c
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@@ -2,7 +2,7 @@
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 /*
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  * Watchdog driver for IMX2 and later processors
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  *
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- *  Copyright (C) 2010 Wolfram Sang, Pengutronix e.K. <w.sang@pengutronix.de>
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+ *  Copyright (C) 2010 Wolfram Sang, Pengutronix e.K. <kernel@pengutronix.de>
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  *  Copyright (C) 2014 Freescale Semiconductor, Inc.
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  *
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  * some parts adapted by similar drivers from Darius Augulis and Vladimir
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@@ -71,7 +71,6 @@
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 module_param(nowayout, bool, 0);
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 MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
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 				__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
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-
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 static unsigned timeout;
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 module_param(timeout, uint, 0);
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@@ -245,34 +244,38 @@
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 	.max_register = 0x8,
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 };
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+static void imx2_wdt_action(void *data)
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+{
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+	clk_disable_unprepare(data);
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+}
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+
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 static int __init imx2_wdt_probe(struct platform_device *pdev)
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 {
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+	struct device *dev = &pdev->dev;
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 	struct imx2_wdt_device *wdev;
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 	struct watchdog_device *wdog;
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-	struct resource *res;
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 	void __iomem *base;
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 	int ret;
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 	u32 val;
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-	wdev = devm_kzalloc(&pdev->dev, sizeof(*wdev), GFP_KERNEL);
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+	wdev = devm_kzalloc(dev, sizeof(*wdev), GFP_KERNEL);
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 	if (!wdev)
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 		return -ENOMEM;
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-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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-	base = devm_ioremap_resource(&pdev->dev, res);
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+	base = devm_platform_ioremap_resource(pdev, 0);
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 	if (IS_ERR(base))
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 		return PTR_ERR(base);
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-	wdev->regmap = devm_regmap_init_mmio_clk(&pdev->dev, NULL, base,
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+	wdev->regmap = devm_regmap_init_mmio_clk(dev, NULL, base,
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 						 &imx2_wdt_regmap_config);
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 	if (IS_ERR(wdev->regmap)) {
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-		dev_err(&pdev->dev, "regmap init failed\n");
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+		dev_err(dev, "regmap init failed\n");
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 		return PTR_ERR(wdev->regmap);
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 	}
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-	wdev->clk = devm_clk_get(&pdev->dev, NULL);
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+	wdev->clk = devm_clk_get(dev, NULL);
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 	if (IS_ERR(wdev->clk)) {
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-		dev_err(&pdev->dev, "can't get Watchdog clock\n");
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+		dev_err(dev, "can't get Watchdog clock\n");
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 		return PTR_ERR(wdev->clk);
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 	}
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@@ -282,28 +285,32 @@
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 	wdog->min_timeout	= 1;
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 	wdog->timeout		= IMX2_WDT_DEFAULT_TIME;
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 	wdog->max_hw_heartbeat_ms = IMX2_WDT_MAX_TIME * 1000;
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-	wdog->parent		= &pdev->dev;
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+	wdog->parent		= dev;
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 	ret = platform_get_irq(pdev, 0);
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 	if (ret > 0)
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-		if (!devm_request_irq(&pdev->dev, ret, imx2_wdt_isr, 0,
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-				      dev_name(&pdev->dev), wdog))
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+		if (!devm_request_irq(dev, ret, imx2_wdt_isr, 0,
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+				      dev_name(dev), wdog))
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 			wdog->info = &imx2_wdt_pretimeout_info;
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 	ret = clk_prepare_enable(wdev->clk);
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 	if (ret)
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 		return ret;
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+	ret = devm_add_action_or_reset(dev, imx2_wdt_action, wdev->clk);
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+	if (ret)
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+		return ret;
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+
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 	regmap_read(wdev->regmap, IMX2_WDT_WRSR, &val);
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 	wdog->bootstatus = val & IMX2_WDT_WRSR_TOUT ? WDIOF_CARDRESET : 0;
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-	wdev->ext_reset = of_property_read_bool(pdev->dev.of_node,
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+	wdev->ext_reset = of_property_read_bool(dev->of_node,
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 						"fsl,ext-reset-output");
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 	platform_set_drvdata(pdev, wdog);
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 	watchdog_set_drvdata(wdog, wdev);
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 	watchdog_set_nowayout(wdog, nowayout);
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 	watchdog_set_restart_priority(wdog, 128);
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-	watchdog_init_timeout(wdog, timeout, &pdev->dev);
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+	watchdog_init_timeout(wdog, timeout, dev);
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 	if (imx2_wdt_is_running(wdev)) {
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 		imx2_wdt_set_timeout(wdog, wdog->timeout);
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@@ -317,34 +324,7 @@
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 	 */
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 	regmap_write(wdev->regmap, IMX2_WDT_WMCR, 0);
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-	ret = watchdog_register_device(wdog);
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-	if (ret) {
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-		dev_err(&pdev->dev, "cannot register watchdog device\n");
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-		goto disable_clk;
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-	}
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-
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-	dev_info(&pdev->dev, "timeout %d sec (nowayout=%d)\n",
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-		 wdog->timeout, nowayout);
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-
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-	return 0;
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-
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-disable_clk:
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-	clk_disable_unprepare(wdev->clk);
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-	return ret;
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-}
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-
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-static int __exit imx2_wdt_remove(struct platform_device *pdev)
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-{
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-	struct watchdog_device *wdog = platform_get_drvdata(pdev);
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-	struct imx2_wdt_device *wdev = watchdog_get_drvdata(wdog);
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-
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-	watchdog_unregister_device(wdog);
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-
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-	if (imx2_wdt_is_running(wdev)) {
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-		imx2_wdt_ping(wdog);
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-		dev_crit(&pdev->dev, "Device removed: Expect reboot!\n");
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-	}
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-	return 0;
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+	return devm_watchdog_register_device(dev, wdog);
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 }
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 static void imx2_wdt_shutdown(struct platform_device *pdev)
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@@ -363,9 +343,8 @@
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 	}
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 }
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-#ifdef CONFIG_PM_SLEEP
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 /* Disable watchdog if it is active or non-active but still running */
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-static int imx2_wdt_suspend(struct device *dev)
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+static int __maybe_unused imx2_wdt_suspend(struct device *dev)
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 {
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 	struct watchdog_device *wdog = dev_get_drvdata(dev);
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 	struct imx2_wdt_device *wdev = watchdog_get_drvdata(wdog);
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@@ -386,7 +365,7 @@
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 }
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 /* Enable watchdog and configure it if necessary */
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-static int imx2_wdt_resume(struct device *dev)
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+static int __maybe_unused imx2_wdt_resume(struct device *dev)
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 {
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 	struct watchdog_device *wdog = dev_get_drvdata(dev);
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 	struct imx2_wdt_device *wdev = watchdog_get_drvdata(wdog);
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@@ -411,7 +390,6 @@
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 	return 0;
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 }
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-#endif
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 static SIMPLE_DEV_PM_OPS(imx2_wdt_pm_ops, imx2_wdt_suspend,
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 			 imx2_wdt_resume);
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@@ -423,7 +401,6 @@
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 MODULE_DEVICE_TABLE(of, imx2_wdt_dt_ids);
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 static struct platform_driver imx2_wdt_driver = {
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-	.remove		= __exit_p(imx2_wdt_remove),
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 	.shutdown	= imx2_wdt_shutdown,
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 	.driver		= {
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 		.name	= DRIVER_NAME,