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Commit f933d383 authored by Abhishek Sahu's avatar Abhishek Sahu Committed by Stephen Boyd
Browse files

clk: qcom: add read-only divider operations 



Some of the divider settings are preconfigured and should not
be changed by the clock framework during frequency change. This
patch adds the read-only divider operation for QCOM dividers
which is equivalent to generic divider operations in
'commit 79c6ab50 ("clk: divider: add CLK_DIVIDER_READ_ONLY flag")'.

Signed-off-by: default avatarAbhishek Sahu <absahu@codeaurora.org>
Signed-off-by: default avatarStephen Boyd <sboyd@codeaurora.org>
parent 23c68cc9

drivers/clk/qcom/clk-regmap-divider.c

+29 −0
Original line number Diff line number Diff line
@@ -23,6 +23,29 @@ static inline struct clk_regmap_div *to_clk_regmap_div(struct clk_hw *hw) 
	return container_of(to_clk_regmap(hw), struct clk_regmap_div, clkr);

}



static long div_round_ro_rate(struct clk_hw *hw, unsigned long rate,

			      unsigned long *prate)

{

	struct clk_regmap_div *divider = to_clk_regmap_div(hw);

	struct clk_regmap *clkr = &divider->clkr;

	u32 div;

	struct clk_hw *hw_parent = clk_hw_get_parent(hw);



	regmap_read(clkr->regmap, divider->reg, &div);

	div >>= divider->shift;

	div &= BIT(divider->width) - 1;

	div += 1;



	if (clk_hw_get_flags(hw) & CLK_SET_RATE_PARENT) {

		if (!hw_parent)

			return -EINVAL;



		*prate = clk_hw_round_rate(hw_parent, rate * div);

	}



	return DIV_ROUND_UP_ULL((u64)*prate, div);

}



static long div_round_rate(struct clk_hw *hw, unsigned long rate,

			   unsigned long *prate)

{
@@ -68,3 +91,9 @@ const struct clk_ops clk_regmap_div_ops = { 
	.recalc_rate = div_recalc_rate,

};

EXPORT_SYMBOL_GPL(clk_regmap_div_ops);



const struct clk_ops clk_regmap_div_ro_ops = {

	.round_rate = div_round_ro_rate,

	.recalc_rate = div_recalc_rate,

};

EXPORT_SYMBOL_GPL(clk_regmap_div_ro_ops);

drivers/clk/qcom/clk-regmap-divider.h

+1 −0
Original line number Diff line number Diff line
@@ -25,5 +25,6 @@ struct clk_regmap_div { 
};



extern const struct clk_ops clk_regmap_div_ops;

extern const struct clk_ops clk_regmap_div_ro_ops;



#endif