disable kernel build waring

hc

2024-05-10 093a6c67005148ae32a5c9e4553491b9f5c2457b

 kernel/include/linux/mailbox_controller.h
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@@ -1,8 +1,4 @@
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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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+/* SPDX-License-Identifier: GPL-2.0-only */
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 #ifndef __MAILBOX_CONTROLLER_H
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 #define __MAILBOX_CONTROLLER_H
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@@ -24,6 +20,9 @@
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  *		transmission of data is reported by the controller via
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  *		mbox_chan_txdone (if it has some TX ACK irq). It must not
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  *		sleep.
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+ * @flush:	Called when a client requests transmissions to be blocking but
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+ *		the context doesn't allow sleeping. Typically the controller
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+ *		will implement a busy loop waiting for the data to flush out.
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  * @startup:	Called when a client requests the chan. The controller
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  *		could ask clients for additional parameters of communication
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  *		to be provided via client's chan_data. This call may
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@@ -46,6 +45,7 @@
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  */
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 struct mbox_chan_ops {
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 	int (*send_data)(struct mbox_chan *chan, void *data);
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+	int (*flush)(struct mbox_chan *chan, unsigned long timeout);
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 	int (*startup)(struct mbox_chan *chan);
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 	void (*shutdown)(struct mbox_chan *chan);
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 	bool (*last_tx_done)(struct mbox_chan *chan);
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@@ -131,4 +131,9 @@
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 void mbox_chan_received_data(struct mbox_chan *chan, void *data); /* atomic */
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 void mbox_chan_txdone(struct mbox_chan *chan, int r); /* atomic */
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+int devm_mbox_controller_register(struct device *dev,
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+				  struct mbox_controller *mbox);
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+void devm_mbox_controller_unregister(struct device *dev,
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+				     struct mbox_controller *mbox);
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+
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 #endif /* __MAILBOX_CONTROLLER_H */