add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/mailbox/arm_mhu.c
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@@ -1,28 +1,17 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  * Copyright (C) 2013-2015 Fujitsu Semiconductor Ltd.
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  * Copyright (C) 2015 Linaro Ltd.
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  * Author: Jassi Brar <jaswinder.singh@linaro.org>
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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 as published by
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- * the Free Software Foundation, version 2 of the License.
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- *
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- * This program is distributed in the hope that it will be useful,
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- * but WITHOUT ANY WARRANTY; without even the implied warranty of
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- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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- * GNU General Public License for more details.
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  */
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-#include <linux/interrupt.h>
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-#include <linux/spinlock.h>
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-#include <linux/mutex.h>
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-#include <linux/delay.h>
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-#include <linux/slab.h>
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-#include <linux/err.h>
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-#include <linux/io.h>
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-#include <linux/module.h>
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 #include <linux/amba/bus.h>
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+#include <linux/device.h>
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+#include <linux/err.h>
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+#include <linux/interrupt.h>
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+#include <linux/io.h>
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 #include <linux/mailbox_controller.h>
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+#include <linux/module.h>
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 #define INTR_STAT_OFS	0x0
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 #define INTR_SET_OFS	0x8
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@@ -124,6 +113,9 @@
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 	struct device *dev = &adev->dev;
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 	int mhu_reg[MHU_CHANS] = {MHU_LP_OFFSET, MHU_HP_OFFSET, MHU_SEC_OFFSET};
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+	if (!of_device_is_compatible(dev->of_node, "arm,mhu"))
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+		return -ENODEV;
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+
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 	/* Allocate memory for device */
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 	mhu = devm_kzalloc(dev, sizeof(*mhu), GFP_KERNEL);
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 	if (!mhu)
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@@ -152,22 +144,13 @@
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 	amba_set_drvdata(adev, mhu);
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-	err = mbox_controller_register(&mhu->mbox);
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+	err = devm_mbox_controller_register(dev, &mhu->mbox);
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 	if (err) {
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 		dev_err(dev, "Failed to register mailboxes %d\n", err);
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 		return err;
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 	}
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 	dev_info(dev, "ARM MHU Mailbox registered\n");
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-	return 0;
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-}
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-
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-static int mhu_remove(struct amba_device *adev)
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-{
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-	struct arm_mhu *mhu = amba_get_drvdata(adev);
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-
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-	mbox_controller_unregister(&mhu->mbox);
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-
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 	return 0;
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 }
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..
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@@ -186,7 +169,6 @@
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 	},
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 	.id_table	= mhu_ids,
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 	.probe		= mhu_probe,
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-	.remove		= mhu_remove,
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 };
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 module_amba_driver(arm_mhu_driver);
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