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2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/watchdog/pic32-dmt.c
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@@ -1,13 +1,9 @@
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+// SPDX-License-Identifier: GPL-2.0-or-later
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 /*
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  * PIC32 deadman timer driver
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  *
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  * Purna Chandra Mandal <purna.mandal@microchip.com>
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  * Copyright (c) 2016, Microchip Technology Inc.
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- *
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- * This program is free software; you can redistribute it and/or
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- * modify it under the terms of the GNU General Public License
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- * as published by the Free Software Foundation; either version
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- * 2 of the License, or (at your option) any later version.
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  */
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 #include <linux/clk.h>
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 #include <linux/device.h>
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@@ -168,69 +164,58 @@
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 	.ops		= &pic32_dmt_fops,
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 };
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+static void pic32_clk_disable_unprepare(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 pic32_dmt_probe(struct platform_device *pdev)
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 {
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+	struct device *dev = &pdev->dev;
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 	int ret;
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 	struct pic32_dmt *dmt;
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-	struct resource *mem;
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 	struct watchdog_device *wdd = &pic32_dmt_wdd;
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-	dmt = devm_kzalloc(&pdev->dev, sizeof(*dmt), GFP_KERNEL);
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+	dmt = devm_kzalloc(dev, sizeof(*dmt), GFP_KERNEL);
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 	if (!dmt)
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 		return -ENOMEM;
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-	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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-	dmt->regs = devm_ioremap_resource(&pdev->dev, mem);
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+	dmt->regs = devm_platform_ioremap_resource(pdev, 0);
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 	if (IS_ERR(dmt->regs))
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 		return PTR_ERR(dmt->regs);
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-	dmt->clk = devm_clk_get(&pdev->dev, NULL);
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+	dmt->clk = devm_clk_get(dev, NULL);
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 	if (IS_ERR(dmt->clk)) {
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-		dev_err(&pdev->dev, "clk not found\n");
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+		dev_err(dev, "clk not found\n");
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 		return PTR_ERR(dmt->clk);
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 	}
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 	ret = clk_prepare_enable(dmt->clk);
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 	if (ret)
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 		return ret;
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+	ret = devm_add_action_or_reset(dev, pic32_clk_disable_unprepare,
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+				       dmt->clk);
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+	if (ret)
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+		return ret;
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 	wdd->timeout = pic32_dmt_get_timeout_secs(dmt);
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 	if (!wdd->timeout) {
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-		dev_err(&pdev->dev,
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-			"failed to read watchdog register timeout\n");
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-		ret = -EINVAL;
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-		goto out_disable_clk;
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+		dev_err(dev, "failed to read watchdog register timeout\n");
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+		return -EINVAL;
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 	}
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-	dev_info(&pdev->dev, "timeout %d\n", wdd->timeout);
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+	dev_info(dev, "timeout %d\n", wdd->timeout);
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 	wdd->bootstatus = pic32_dmt_bootstatus(dmt) ? WDIOF_CARDRESET : 0;
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 	watchdog_set_nowayout(wdd, WATCHDOG_NOWAYOUT);
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 	watchdog_set_drvdata(wdd, dmt);
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-	ret = watchdog_register_device(wdd);
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-	if (ret) {
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-		dev_err(&pdev->dev, "watchdog register failed, err %d\n", ret);
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-		goto out_disable_clk;
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-	}
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+	ret = devm_watchdog_register_device(dev, wdd);
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+	if (ret)
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+		return ret;
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 	platform_set_drvdata(pdev, wdd);
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-	return 0;
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-
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-out_disable_clk:
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-	clk_disable_unprepare(dmt->clk);
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-	return ret;
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-}
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-
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-static int pic32_dmt_remove(struct platform_device *pdev)
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-{
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-	struct watchdog_device *wdd = platform_get_drvdata(pdev);
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-	struct pic32_dmt *dmt = watchdog_get_drvdata(wdd);
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-
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-	watchdog_unregister_device(wdd);
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-	clk_disable_unprepare(dmt->clk);
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-
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 	return 0;
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 }
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..
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@@ -242,7 +227,6 @@
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 static struct platform_driver pic32_dmt_driver = {
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 	.probe		= pic32_dmt_probe,
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-	.remove		= pic32_dmt_remove,
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 	.driver		= {
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 		.name		= "pic32-dmt",
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 		.of_match_table = of_match_ptr(pic32_dmt_of_ids),