linux/drivers/slimbus/sched.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (c) 2011-2017, The Linux Foundation
 */

#include <linux/errno.h>
#include "slimbus.h"

/**
 * slim_ctrl_clk_pause() - Called by slimbus controller to enter/exit
 *			   'clock pause'
 * @ctrl: controller requesting bus to be paused or woken up
 * @wakeup: Wakeup this controller from clock pause.
 * @restart: Restart time value per spec used for clock pause. This value
 *	isn't used when controller is to be woken up.
 *
 * Slimbus specification needs this sequence to turn-off clocks for the bus.
 * The sequence involves sending 3 broadcast messages (reconfiguration
 * sequence) to inform all devices on the bus.
 * To exit clock-pause, controller typically wakes up active framer device.
 * This API executes clock pause reconfiguration sequence if wakeup is false.
 * If wakeup is true, controller's wakeup is called.
 * For entering clock-pause, -EBUSY is returned if a message txn in pending.
 */
int slim_ctrl_clk_pause(struct slim_controller *ctrl, bool wakeup, u8 restart)
{ … }
EXPORT_SYMBOL_GPL(…);