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e3f05d3b18
This is a feature that can also be found in sprd composite clocks, provide a bunch of helpers that can be reused later on. Signed-off-by: Chunyan Zhang <chunyan.zhang@spreadtrum.com> Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
76 lines
1.9 KiB
C
76 lines
1.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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//
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// Spreadtrum divider clock driver
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//
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// Copyright (C) 2017 Spreadtrum, Inc.
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// Author: Chunyan Zhang <chunyan.zhang@spreadtrum.com>
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#ifndef _SPRD_DIV_H_
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#define _SPRD_DIV_H_
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#include "common.h"
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/**
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* struct sprd_div_internal - Internal divider description
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* @shift: Bit offset of the divider in its register
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* @width: Width of the divider field in its register
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*
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* That structure represents a single divider, and is meant to be
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* embedded in other structures representing the various clock
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* classes.
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*/
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struct sprd_div_internal {
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u8 shift;
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u8 width;
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};
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#define _SPRD_DIV_CLK(_shift, _width) \
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{ \
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.shift = _shift, \
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.width = _width, \
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}
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struct sprd_div {
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struct sprd_div_internal div;
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struct sprd_clk_common common;
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};
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#define SPRD_DIV_CLK(_struct, _name, _parent, _reg, \
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_shift, _width, _flags) \
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struct sprd_div _struct = { \
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.div = _SPRD_DIV_CLK(_shift, _width), \
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.common = { \
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.regmap = NULL, \
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.reg = _reg, \
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.hw.init = CLK_HW_INIT(_name, \
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_parent, \
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&sprd_div_ops, \
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_flags), \
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} \
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}
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static inline struct sprd_div *hw_to_sprd_div(const struct clk_hw *hw)
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{
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struct sprd_clk_common *common = hw_to_sprd_clk_common(hw);
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return container_of(common, struct sprd_div, common);
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}
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long sprd_div_helper_round_rate(struct sprd_clk_common *common,
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const struct sprd_div_internal *div,
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unsigned long rate,
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unsigned long *parent_rate);
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unsigned long sprd_div_helper_recalc_rate(struct sprd_clk_common *common,
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const struct sprd_div_internal *div,
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unsigned long parent_rate);
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int sprd_div_helper_set_rate(const struct sprd_clk_common *common,
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const struct sprd_div_internal *div,
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unsigned long rate,
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unsigned long parent_rate);
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extern const struct clk_ops sprd_div_ops;
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#endif /* _SPRD_DIV_H_ */
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