Commit 187e5cd2 authored by Xiaolong Zhang's avatar Xiaolong Zhang Committed by Stephen Boyd
Browse files

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: default avatarXiaolong Zhang <xiaolong.zhang@unisoc.com>
Signed-off-by: default avatarChunyan Zhang <chunyan.zhang@unisoc.com>
Link: https://lkml.kernel.org/r/20200304072730.9193-2-zhang.lyra@gmail.com


Signed-off-by: default avatarStephen Boyd <sboyd@kernel.org>
parent bb6d3fb3

drivers/clk/sprd/gate.c

+17 −0
Original line number Diff line number Diff line
@@ -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);

drivers/clk/sprd/gate.h

+19 −2
Original line number Diff line number Diff line
@@ -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_ */

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