a9701376ed
The reset-simple code lacks a reset callback that is still pretty easy to implement. The only real thing to consider is the delay needed for a device to be reset, so let's expose that as part of the reset-simple driver data. Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de> Signed-off-by: Maxime Ripard <maxime@cerno.tech> Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
49 lines
1.7 KiB
C
49 lines
1.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Simple Reset Controller ops
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*
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* Based on Allwinner SoCs Reset Controller driver
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*
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* Copyright 2013 Maxime Ripard
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*
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* Maxime Ripard <maxime.ripard@free-electrons.com>
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*/
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#ifndef __RESET_SIMPLE_H__
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#define __RESET_SIMPLE_H__
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#include <linux/io.h>
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#include <linux/reset-controller.h>
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#include <linux/spinlock.h>
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/**
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* struct reset_simple_data - driver data for simple reset controllers
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* @lock: spinlock to protect registers during read-modify-write cycles
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* @membase: memory mapped I/O register range
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* @rcdev: reset controller device base structure
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* @active_low: if true, bits are cleared to assert the reset. Otherwise, bits
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* are set to assert the reset. Note that this says nothing about
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* the voltage level of the actual reset line.
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* @status_active_low: if true, bits read back as cleared while the reset is
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* asserted. Otherwise, bits read back as set while the
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* reset is asserted.
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* @reset_us: Minimum delay in microseconds needed that needs to be
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* waited for between an assert and a deassert to reset the
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* device. If multiple consumers with different delay
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* requirements are connected to this controller, it must
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* be the largest minimum delay. 0 means that such a delay is
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* unknown and the reset operation is unsupported.
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*/
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struct reset_simple_data {
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spinlock_t lock;
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void __iomem *membase;
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struct reset_controller_dev rcdev;
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bool active_low;
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bool status_active_low;
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unsigned int reset_us;
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};
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extern const struct reset_control_ops reset_simple_ops;
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#endif /* __RESET_SIMPLE_H__ */
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