linux-kernel - [PATCH 13/13] clk: qcom: add read-only alpha pll post divider operations

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Date:   Thu, 28 Sep 2017 23:20:50 +0530
From:   Abhishek Sahu <absahu@...eaurora.org>
To:     Stephen Boyd <sboyd@...eaurora.org>,
        Michael Turquette <mturquette@...libre.com>
Cc:     Andy Gross <andy.gross@...aro.org>,
        David Brown <david.brown@...aro.org>,
        Rajendra Nayak <rnayak@...eaurora.org>,
        linux-arm-msm@...r.kernel.org, linux-soc@...r.kernel.org,
        linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org,
        Abhishek Sahu <absahu@...eaurora.org>
Subject: [PATCH 13/13] 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@...eaurora.org>
---
 drivers/clk/qcom/clk-alpha-pll.c | 26 ++++++++++++++++++++++++++
 drivers/clk/qcom/clk-alpha-pll.h |  1 +
 2 files changed, 27 insertions(+)

diff --git a/drivers/clk/qcom/clk-alpha-pll.c b/drivers/clk/qcom/clk-alpha-pll.c
index 62b84fa..443fd0b 100644
--- a/drivers/clk/qcom/clk-alpha-pll.c
+++ b/drivers/clk/qcom/clk-alpha-pll.c
@@ -858,6 +858,26 @@ static int clk_alpha_pll_hwfsm_is_enabled(struct clk_hw *hw)
 				  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->offset + pll_user_ctl(pll->pll_type),
+		    &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)
 {
@@ -880,6 +900,12 @@ static int clk_alpha_pll_postdiv_set_rate(struct clk_hw *hw, unsigned long 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);
+
 /* Contains actual property values for different PLL types */
 static const struct
 alpha_pll_props alpha_pll_props[CLK_ALPHA_PLL_TYPE_MAX] = {
diff --git a/drivers/clk/qcom/clk-alpha-pll.h b/drivers/clk/qcom/clk-alpha-pll.h
index dee71b4..a9f8751 100644
--- a/drivers/clk/qcom/clk-alpha-pll.h
+++ b/drivers/clk/qcom/clk-alpha-pll.h
@@ -89,6 +89,7 @@ struct alpha_pll_config {
 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_postdiv_ro_ops;
 
 void clk_alpha_pll_configure(struct clk_alpha_pll *pll, struct regmap *regmap,
 			     const struct alpha_pll_config *config);
-- 
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