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| author | Owen Chen <owen.chen@mediatek.com> | 2019-03-05 08:05:39 +0300 |
|---|---|---|
| committer | Stephen Boyd <sboyd@kernel.org> | 2019-04-11 23:12:40 +0300 |
| commit | a3ae549917f1634f85c62984617521801505eb1e (patch) | |
| tree | 7066835deb691fe6f0ed6a83fd1f2ed00188e766 /drivers/clk/mediatek/clk-mux.h | |
| parent | be17ca6ac76a5cfd07cc3a0397dd05d6929fcbbb (diff) | |
| download | linux-a3ae549917f1634f85c62984617521801505eb1e.tar.xz | |
clk: mediatek: Add new clkmux register API
On both MT8183 & MT6765, there add "set/clr" register for
each clkmux setting, and one update register to trigger value change.
It is designed to prevent read-modify-write racing issue.
The sw design need to add a new API to handle this hw change with
a new mtk_clk_mux/mtk_mux struct in new file "clk-mux.c", "clk-mux.h".
Signed-off-by: Owen Chen <owen.chen@mediatek.com>
Signed-off-by: Weiyi Lu <weiyi.lu@mediatek.com>
Reviewed-by: James Liao <jamesjj.liao@mediatek.com>
Reviewed-by: Nicolas Boichat <drinkcat@chromium.org>
Tested-by: Nicolas Boichat <drinkcat@chromium.org>
[sboyd@kernel.org: Squash in flags=0 to silence warning]
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
Diffstat (limited to 'drivers/clk/mediatek/clk-mux.h')
| -rw-r--r-- | drivers/clk/mediatek/clk-mux.h | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/drivers/clk/mediatek/clk-mux.h b/drivers/clk/mediatek/clk-mux.h new file mode 100644 index 000000000000..f5625f4d9e6c --- /dev/null +++ b/drivers/clk/mediatek/clk-mux.h @@ -0,0 +1,89 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (c) 2018 MediaTek Inc. + * Author: Owen Chen <owen.chen@mediatek.com> + */ + +#ifndef __DRV_CLK_MTK_MUX_H +#define __DRV_CLK_MTK_MUX_H + +#include <linux/clk-provider.h> + +struct mtk_clk_mux { + struct clk_hw hw; + struct regmap *regmap; + const struct mtk_mux *data; + spinlock_t *lock; +}; + +struct mtk_mux { + int id; + const char *name; + const char * const *parent_names; + unsigned int flags; + + u32 mux_ofs; + u32 set_ofs; + u32 clr_ofs; + u32 upd_ofs; + + u8 mux_shift; + u8 mux_width; + u8 gate_shift; + s8 upd_shift; + + const struct clk_ops *ops; + + signed char num_parents; +}; + +extern const struct clk_ops mtk_mux_ops; +extern const struct clk_ops mtk_mux_clr_set_upd_ops; +extern const struct clk_ops mtk_mux_gate_ops; +extern const struct clk_ops mtk_mux_gate_clr_set_upd_ops; + +#define GATE_CLR_SET_UPD_FLAGS(_id, _name, _parents, _mux_ofs, \ + _mux_set_ofs, _mux_clr_ofs, _shift, _width, \ + _gate, _upd_ofs, _upd, _flags, _ops) { \ + .id = _id, \ + .name = _name, \ + .mux_ofs = _mux_ofs, \ + .set_ofs = _mux_set_ofs, \ + .clr_ofs = _mux_clr_ofs, \ + .upd_ofs = _upd_ofs, \ + .mux_shift = _shift, \ + .mux_width = _width, \ + .gate_shift = _gate, \ + .upd_shift = _upd, \ + .parent_names = _parents, \ + .num_parents = ARRAY_SIZE(_parents), \ + .flags = _flags, \ + .ops = &_ops, \ + } + +#define MUX_GATE_CLR_SET_UPD_FLAGS(_id, _name, _parents, _mux_ofs, \ + _mux_set_ofs, _mux_clr_ofs, _shift, _width, \ + _gate, _upd_ofs, _upd, _flags) \ + GATE_CLR_SET_UPD_FLAGS(_id, _name, _parents, _mux_ofs, \ + _mux_set_ofs, _mux_clr_ofs, _shift, _width, \ + _gate, _upd_ofs, _upd, _flags, \ + mtk_mux_gate_clr_set_upd_ops) + +#define MUX_GATE_CLR_SET_UPD(_id, _name, _parents, _mux_ofs, \ + _mux_set_ofs, _mux_clr_ofs, _shift, _width, \ + _gate, _upd_ofs, _upd) \ + MUX_GATE_CLR_SET_UPD_FLAGS(_id, _name, _parents, \ + _mux_ofs, _mux_set_ofs, _mux_clr_ofs, _shift, \ + _width, _gate, _upd_ofs, _upd, \ + CLK_SET_RATE_PARENT) + +struct clk *mtk_clk_register_mux(const struct mtk_mux *mux, + struct regmap *regmap, + spinlock_t *lock); + +int mtk_clk_register_muxes(const struct mtk_mux *muxes, + int num, struct device_node *node, + spinlock_t *lock, + struct clk_onecell_data *clk_data); + +#endif /* __DRV_CLK_MTK_MUX_H */ |