diff options
| author | Xiaolong Zhang <xiaolong.zhang@unisoc.com> | 2020-03-04 15:27:24 +0800 |
|---|---|---|
| committer | Stephen Boyd <sboyd@kernel.org> | 2020-03-24 19:03:56 -0700 |
| commit | 187e5cd2d133771e978e7e4ea6aa684dfd1ce6ab (patch) | |
| tree | cb09afa67e7e7b1743cd51b76cedad563fc59713 /drivers/clk/sprd | |
| parent | bb6d3fb354c5ee8d6bde2d576eb7220ea09862b9 (diff) | |
| download | linux-187e5cd2d133771e978e7e4ea6aa684dfd1ce6ab.tar.bz2 | |
clk: sprd: add gate for pll clocks
Some sprd's gate clocks are used to the switch of pll, which
need to wait a certain time for stable after being enabled.
Signed-off-by: Xiaolong Zhang <xiaolong.zhang@unisoc.com>
Signed-off-by: Chunyan Zhang <chunyan.zhang@unisoc.com>
Link: https://lkml.kernel.org/r/20200304072730.9193-2-zhang.lyra@gmail.com
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
Diffstat (limited to 'drivers/clk/sprd')
| -rw-r--r-- | drivers/clk/sprd/gate.c | 17 | ||||
| -rw-r--r-- | drivers/clk/sprd/gate.h | 21 |
2 files changed, 36 insertions, 2 deletions
diff --git a/drivers/clk/sprd/gate.c b/drivers/clk/sprd/gate.c index f59d1936b412..574cfc116bbc 100644 --- a/drivers/clk/sprd/gate.c +++ b/drivers/clk/sprd/gate.c @@ -79,6 +79,17 @@ static int sprd_sc_gate_enable(struct clk_hw *hw) return 0; } + +static int sprd_pll_sc_gate_prepare(struct clk_hw *hw) +{ + struct sprd_gate *sg = hw_to_sprd_gate(hw); + + clk_sc_gate_toggle(sg, true); + udelay(sg->udelay); + + return 0; +} + static int sprd_gate_is_enabled(struct clk_hw *hw) { struct sprd_gate *sg = hw_to_sprd_gate(hw); @@ -109,3 +120,9 @@ const struct clk_ops sprd_sc_gate_ops = { }; EXPORT_SYMBOL_GPL(sprd_sc_gate_ops); +const struct clk_ops sprd_pll_sc_gate_ops = { + .unprepare = sprd_sc_gate_disable, + .prepare = sprd_pll_sc_gate_prepare, + .is_enabled = sprd_gate_is_enabled, +}; +EXPORT_SYMBOL_GPL(sprd_pll_sc_gate_ops); diff --git a/drivers/clk/sprd/gate.h b/drivers/clk/sprd/gate.h index dc352ea55e1f..d380d77b8dce 100644 --- a/drivers/clk/sprd/gate.h +++ b/drivers/clk/sprd/gate.h @@ -14,16 +14,19 @@ struct sprd_gate { u32 enable_mask; u16 flags; u16 sc_offset; + u16 udelay; struct sprd_clk_common common; }; -#define SPRD_SC_GATE_CLK_OPS(_struct, _name, _parent, _reg, _sc_offset, \ - _enable_mask, _flags, _gate_flags, _ops) \ +#define SPRD_SC_GATE_CLK_OPS_UDELAY(_struct, _name, _parent, _reg, \ + _sc_offset, _enable_mask, _flags, \ + _gate_flags, _udelay, _ops) \ struct sprd_gate _struct = { \ .enable_mask = _enable_mask, \ .sc_offset = _sc_offset, \ .flags = _gate_flags, \ + .udelay = _udelay, \ .common = { \ .regmap = NULL, \ .reg = _reg, \ @@ -34,6 +37,12 @@ struct sprd_gate { } \ } +#define SPRD_SC_GATE_CLK_OPS(_struct, _name, _parent, _reg, _sc_offset, \ + _enable_mask, _flags, _gate_flags, _ops) \ + SPRD_SC_GATE_CLK_OPS_UDELAY(_struct, _name, _parent, _reg, \ + _sc_offset, _enable_mask, _flags, \ + _gate_flags, 0, _ops) + #define SPRD_GATE_CLK(_struct, _name, _parent, _reg, \ _enable_mask, _flags, _gate_flags) \ SPRD_SC_GATE_CLK_OPS(_struct, _name, _parent, _reg, 0, \ @@ -46,6 +55,13 @@ struct sprd_gate { _enable_mask, _flags, _gate_flags, \ &sprd_sc_gate_ops) +#define SPRD_PLL_SC_GATE_CLK(_struct, _name, _parent, _reg, _sc_offset, \ + _enable_mask, _flags, _gate_flags, _udelay) \ + SPRD_SC_GATE_CLK_OPS_UDELAY(_struct, _name, _parent, _reg, \ + _sc_offset, _enable_mask, _flags, \ + _gate_flags, _udelay, \ + &sprd_pll_sc_gate_ops) + static inline struct sprd_gate *hw_to_sprd_gate(const struct clk_hw *hw) { struct sprd_clk_common *common = hw_to_sprd_clk_common(hw); @@ -55,5 +71,6 @@ static inline struct sprd_gate *hw_to_sprd_gate(const struct clk_hw *hw) extern const struct clk_ops sprd_gate_ops; extern const struct clk_ops sprd_sc_gate_ops; +extern const struct clk_ops sprd_pll_sc_gate_ops; #endif /* _SPRD_GATE_H_ */ |