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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/drivers/char/hw_random/st-rng.c
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@@ -1,3 +1,4 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  * ST Random Number Generator Driver ST's Platforms
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  *
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@@ -5,16 +6,13 @@
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  *         Lee Jones <lee.jones@linaro.org>
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  *
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  * Copyright (C) 2015 STMicroelectronics (R&D) Limited
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- *
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- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License version 2 as
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- * published by the Free Software Foundation.
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  */
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 #include <linux/clk.h>
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 #include <linux/delay.h>
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 #include <linux/hw_random.h>
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 #include <linux/io.h>
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+#include <linux/kernel.h>
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 #include <linux/module.h>
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 #include <linux/of.h>
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 #include <linux/platform_device.h>
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@@ -75,7 +73,6 @@
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 static int st_rng_probe(struct platform_device *pdev)
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 {
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 	struct st_rng_data *ddata;
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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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 	int ret;
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@@ -84,8 +81,7 @@
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 	if (!ddata)
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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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@@ -105,7 +101,7 @@
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 	dev_set_drvdata(&pdev->dev, ddata);
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-	ret = hwrng_register(&ddata->ops);
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+	ret = devm_hwrng_register(&pdev->dev, &ddata->ops);
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 	if (ret) {
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 		dev_err(&pdev->dev, "Failed to register HW RNG\n");
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 		clk_disable_unprepare(clk);
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@@ -121,14 +117,12 @@
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 {
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 	struct st_rng_data *ddata = dev_get_drvdata(&pdev->dev);
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-	hwrng_unregister(&ddata->ops);
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-
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 	clk_disable_unprepare(ddata->clk);
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 	return 0;
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 }
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-static const struct of_device_id st_rng_match[] = {
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+static const struct of_device_id st_rng_match[] __maybe_unused = {
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 	{ .compatible = "st,rng" },
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 	{},
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 };