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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 79c6ab5095 ("clk: divider: add CLK_DIVIDER_READ_ONLY flag")'.

Signed-off-by: Abhishek Sahu <absahu@codeaurora.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
This commit is contained in:
Abhishek Sahu 2017-12-13 19:55:32 +05:30 committed by Stephen Boyd
parent 23c68cc968
commit f933d383df
2 changed files with 30 additions and 0 deletions
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29
drivers/clk/qcom/clk-regmap-divider.c
View File

@ -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);

1
drivers/clk/qcom/clk-regmap-divider.h
View File

@ -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