diff options
author | Abhishek Sahu <absahu@codeaurora.org> | 2017-09-28 19:50:50 +0200 |
---|---|---|
committer | Stephen Boyd <sboyd@codeaurora.org> | 2017-12-14 01:54:10 +0100 |
commit | 23c68cc9683efbd08457f06fb5eacd7c8616dfae (patch) | |
tree | fd63be0d44de15676c292916bec38352fec19049 /drivers/clk/qcom | |
parent | clk: qcom: support for 2 bit PLL post divider (diff) | |
download | linux-23c68cc9683efbd08457f06fb5eacd7c8616dfae.tar.xz linux-23c68cc9683efbd08457f06fb5eacd7c8616dfae.zip |
clk: qcom: add read-only alpha pll post 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 alpha pll
post divider which is equivalent to generic divider operations in
'commit 79c6ab509558 ("clk: divider: add CLK_DIVIDER_READ_ONLY flag")'.
Signed-off-by: Abhishek Sahu <absahu@codeaurora.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Diffstat (limited to 'drivers/clk/qcom')
-rw-r--r-- | drivers/clk/qcom/clk-alpha-pll.c | 25 | ||||
-rw-r--r-- | drivers/clk/qcom/clk-alpha-pll.h | 1 |
2 files changed, 26 insertions, 0 deletions
diff --git a/drivers/clk/qcom/clk-alpha-pll.c b/drivers/clk/qcom/clk-alpha-pll.c index 2de66b98e997..6d04cd96482a 100644 --- a/drivers/clk/qcom/clk-alpha-pll.c +++ b/drivers/clk/qcom/clk-alpha-pll.c @@ -787,6 +787,25 @@ clk_alpha_pll_postdiv_round_rate(struct clk_hw *hw, unsigned long rate, pll->width, CLK_DIVIDER_POWER_OF_TWO); } +static long +clk_alpha_pll_postdiv_round_ro_rate(struct clk_hw *hw, unsigned long rate, + unsigned long *prate) +{ + struct clk_alpha_pll_postdiv *pll = to_clk_alpha_pll_postdiv(hw); + u32 ctl, div; + + regmap_read(pll->clkr.regmap, PLL_USER_CTL(pll), &ctl); + + ctl >>= PLL_POST_DIV_SHIFT; + ctl &= BIT(pll->width) - 1; + div = 1 << fls(ctl); + + if (clk_hw_get_flags(hw) & CLK_SET_RATE_PARENT) + *prate = clk_hw_round_rate(clk_hw_get_parent(hw), div * rate); + + return DIV_ROUND_UP_ULL((u64)*prate, div); +} + static int clk_alpha_pll_postdiv_set_rate(struct clk_hw *hw, unsigned long rate, unsigned long parent_rate) { @@ -807,3 +826,9 @@ const struct clk_ops clk_alpha_pll_postdiv_ops = { .set_rate = clk_alpha_pll_postdiv_set_rate, }; EXPORT_SYMBOL_GPL(clk_alpha_pll_postdiv_ops); + +const struct clk_ops clk_alpha_pll_postdiv_ro_ops = { + .round_rate = clk_alpha_pll_postdiv_round_ro_rate, + .recalc_rate = clk_alpha_pll_postdiv_recalc_rate, +}; +EXPORT_SYMBOL_GPL(clk_alpha_pll_postdiv_ro_ops); diff --git a/drivers/clk/qcom/clk-alpha-pll.h b/drivers/clk/qcom/clk-alpha-pll.h index bcc6676a8e7a..7593e8a56cf2 100644 --- a/drivers/clk/qcom/clk-alpha-pll.h +++ b/drivers/clk/qcom/clk-alpha-pll.h @@ -107,6 +107,7 @@ extern const struct clk_ops clk_alpha_pll_ops; extern const struct clk_ops clk_alpha_pll_hwfsm_ops; extern const struct clk_ops clk_alpha_pll_postdiv_ops; extern const struct clk_ops clk_alpha_pll_huayra_ops; +extern const struct clk_ops clk_alpha_pll_postdiv_ro_ops; void clk_alpha_pll_configure(struct clk_alpha_pll *pll, struct regmap *regmap, const struct alpha_pll_config *config); |