1// SPDX-License-Identifier: GPL-2.0
 2//
 3// Spreadtrum divider clock driver
 4//
 5// Copyright (C) 2017 Spreadtrum, Inc.
 6// Author: Chunyan Zhang <chunyan.zhang@spreadtrum.com>
 7
 8#ifndef _SPRD_DIV_H_
 9#define _SPRD_DIV_H_
10
11#include "common.h"
12
13/**
14 * struct sprd_div_internal - Internal divider description
15 * @shift: Bit offset of the divider in its register
16 * @width: Width of the divider field in its register
17 *
18 * That structure represents a single divider, and is meant to be
19 * embedded in other structures representing the various clock
20 * classes.
21 */
22struct sprd_div_internal {
23	u8	shift;
24	u8	width;
25};
26
27#define _SPRD_DIV_CLK(_shift, _width)	\
28	{				\
29		.shift	= _shift,	\
30		.width	= _width,	\
31	}
32
33struct sprd_div {
34	struct sprd_div_internal	div;
35	struct sprd_clk_common	common;
36};
37
38#define SPRD_DIV_CLK(_struct, _name, _parent, _reg,			\
39			_shift, _width, _flags)				\
40	struct sprd_div _struct = {					\
41		.div	= _SPRD_DIV_CLK(_shift, _width),		\
42		.common	= {						\
43			.regmap		= NULL,				\
44			.reg		= _reg,				\
45			.hw.init	= CLK_HW_INIT(_name,		\
46						      _parent,		\
47						      &sprd_div_ops,	\
48						      _flags),		\
49		}							\
50	}
51
52static inline struct sprd_div *hw_to_sprd_div(const struct clk_hw *hw)
53{
54	struct sprd_clk_common *common = hw_to_sprd_clk_common(hw);
55
56	return container_of(common, struct sprd_div, common);
57}
58
59long sprd_div_helper_round_rate(struct sprd_clk_common *common,
60				const struct sprd_div_internal *div,
61				unsigned long rate,
62				unsigned long *parent_rate);
63
64unsigned long sprd_div_helper_recalc_rate(struct sprd_clk_common *common,
65					  const struct sprd_div_internal *div,
66					  unsigned long parent_rate);
67
68int sprd_div_helper_set_rate(const struct sprd_clk_common *common,
69			     const struct sprd_div_internal *div,
70			     unsigned long rate,
71			     unsigned long parent_rate);
72
73extern const struct clk_ops sprd_div_ops;
74
75#endif /* _SPRD_DIV_H_ */