修改内核路径

hc

2024-05-14 bedbef8ad3e75a304af6361af235302bcc61d06b

 kernel/drivers/watchdog/st_lpc_wdt.c
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@@ -142,13 +142,18 @@
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 	.ops		= &st_wdog_ops,
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 };
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+static void st_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 st_wdog_probe(struct platform_device *pdev)
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 {
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+	struct device *dev = &pdev->dev;
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 	const struct of_device_id *match;
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-	struct device_node *np = pdev->dev.of_node;
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+	struct device_node *np = dev->of_node;
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 	struct st_wdog *st_wdog;
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 	struct regmap *regmap;
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-	struct resource *res;
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 	struct clk *clk;
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 	void __iomem *base;
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 	uint32_t mode;
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@@ -156,7 +161,7 @@
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 	ret = of_property_read_u32(np, "st,lpc-mode", &mode);
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 	if (ret) {
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-		dev_err(&pdev->dev, "An LPC mode must be provided\n");
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+		dev_err(dev, "An LPC mode must be provided\n");
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 		return -EINVAL;
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 	}
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@@ -164,35 +169,34 @@
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 	if (mode != ST_LPC_MODE_WDT)
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 		return -ENODEV;
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-	st_wdog = devm_kzalloc(&pdev->dev, sizeof(*st_wdog), GFP_KERNEL);
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+	st_wdog = devm_kzalloc(dev, sizeof(*st_wdog), GFP_KERNEL);
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 	if (!st_wdog)
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 		return -ENOMEM;
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-	match = of_match_device(st_wdog_match, &pdev->dev);
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+	match = of_match_device(st_wdog_match, dev);
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 	if (!match) {
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-		dev_err(&pdev->dev, "Couldn't match device\n");
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+		dev_err(dev, "Couldn't match device\n");
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 		return -ENODEV;
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 	}
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 	st_wdog->syscfg	= (struct st_wdog_syscfg *)match->data;
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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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 	regmap = syscon_regmap_lookup_by_phandle(np, "st,syscfg");
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 	if (IS_ERR(regmap)) {
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-		dev_err(&pdev->dev, "No syscfg phandle specified\n");
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+		dev_err(dev, "No syscfg phandle specified\n");
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 		return PTR_ERR(regmap);
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 	}
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-	clk = devm_clk_get(&pdev->dev, NULL);
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+	clk = devm_clk_get(dev, NULL);
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 	if (IS_ERR(clk)) {
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-		dev_err(&pdev->dev, "Unable to request clock\n");
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+		dev_err(dev, "Unable to request clock\n");
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 		return PTR_ERR(clk);
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 	}
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-	st_wdog->dev		= &pdev->dev;
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+	st_wdog->dev		= dev;
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 	st_wdog->base		= base;
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 	st_wdog->clk		= clk;
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 	st_wdog->regmap		= regmap;
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@@ -200,39 +204,36 @@
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 	st_wdog->clkrate	= clk_get_rate(st_wdog->clk);
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 	if (!st_wdog->clkrate) {
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-		dev_err(&pdev->dev, "Unable to fetch clock rate\n");
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+		dev_err(dev, "Unable to fetch clock rate\n");
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 		return -EINVAL;
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 	}
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 	st_wdog_dev.max_timeout = 0xFFFFFFFF / st_wdog->clkrate;
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-	st_wdog_dev.parent = &pdev->dev;
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+	st_wdog_dev.parent = dev;
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 	ret = clk_prepare_enable(clk);
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 	if (ret) {
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-		dev_err(&pdev->dev, "Unable to enable clock\n");
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+		dev_err(dev, "Unable to enable clock\n");
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 		return ret;
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 	}
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+	ret = devm_add_action_or_reset(dev, st_clk_disable_unprepare, clk);
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+	if (ret)
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+		return ret;
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 	watchdog_set_drvdata(&st_wdog_dev, st_wdog);
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 	watchdog_set_nowayout(&st_wdog_dev, WATCHDOG_NOWAYOUT);
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 	/* Init Watchdog timeout with value in DT */
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-	ret = watchdog_init_timeout(&st_wdog_dev, 0, &pdev->dev);
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-	if (ret) {
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-		dev_err(&pdev->dev, "Unable to initialise watchdog timeout\n");
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-		clk_disable_unprepare(clk);
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+	ret = watchdog_init_timeout(&st_wdog_dev, 0, dev);
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+	if (ret)
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 		return ret;
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-	}
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-	ret = watchdog_register_device(&st_wdog_dev);
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-	if (ret) {
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-		dev_err(&pdev->dev, "Unable to register watchdog\n");
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-		clk_disable_unprepare(clk);
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+	ret = devm_watchdog_register_device(dev, &st_wdog_dev);
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+	if (ret)
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 		return ret;
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-	}
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 	st_wdog_setup(st_wdog, true);
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-	dev_info(&pdev->dev, "LPC Watchdog driver registered, reset type is %s",
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+	dev_info(dev, "LPC Watchdog driver registered, reset type is %s",
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 		 st_wdog->warm_reset ? "warm" : "cold");
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 	return ret;
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@@ -243,8 +244,6 @@
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 	struct st_wdog *st_wdog = watchdog_get_drvdata(&st_wdog_dev);
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 	st_wdog_setup(st_wdog, false);
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-	watchdog_unregister_device(&st_wdog_dev);
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-	clk_disable_unprepare(st_wdog->clk);
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 	return 0;
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 }