summaryrefslogtreecommitdiffstats
path: root/drivers/clk/qcom
diff options
context:
space:
mode:
authorAbhishek Sahu <absahu@codeaurora.org>2017-09-28 19:50:50 +0200
committerStephen Boyd <sboyd@codeaurora.org>2017-12-14 01:54:10 +0100
commit23c68cc9683efbd08457f06fb5eacd7c8616dfae (patch)
treefd63be0d44de15676c292916bec38352fec19049 /drivers/clk/qcom
parentclk: qcom: support for 2 bit PLL post divider (diff)
downloadlinux-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.c25
-rw-r--r--drivers/clk/qcom/clk-alpha-pll.h1
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);