[PATCH v1 3/4] clk: qcom: alpha-pll: add support for power off mode for lucid evo PLL

[Dmitry Baryshkov <dmitry.baryshkov@linaro.org>]

PLLs can be kept in standby (default configuration) or in off mode
when disabled during power collapse. Hence add support for pll
disable off mode for lucid evo PLL.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
---
 drivers/clk/qcom/clk-alpha-pll.c | 40 +++++++++++++++++++++++++++++---
 drivers/clk/qcom/clk-alpha-pll.h |  1 +
 2 files changed, 38 insertions(+), 3 deletions(-)

diff --git a/drivers/clk/qcom/clk-alpha-pll.c b/drivers/clk/qcom/clk-alpha-pll.c
index 4a2d91996ce6..493cde7964f8 100644
--- a/drivers/clk/qcom/clk-alpha-pll.c
+++ b/drivers/clk/qcom/clk-alpha-pll.c
@@ -2077,7 +2077,7 @@ static int alpha_pll_lucid_evo_enable(struct clk_hw *hw)
 	return ret;
 }
 
-static void alpha_pll_lucid_evo_disable(struct clk_hw *hw)
+static void _alpha_pll_lucid_evo_disable(struct clk_hw *hw, bool reset)
 {
 	struct clk_alpha_pll *pll = to_clk_alpha_pll(hw);
 	struct regmap *regmap = pll->clkr.regmap;
@@ -2106,9 +2106,12 @@ static void alpha_pll_lucid_evo_disable(struct clk_hw *hw)
 
 	/* Place the PLL mode in STANDBY */
 	regmap_write(regmap, PLL_OPMODE(pll), PLL_STANDBY);
+
+	if (reset)
+		regmap_update_bits(regmap, PLL_MODE(pll), PLL_RESET_N, 0);
 }
 
-static int alpha_pll_lucid_evo_prepare(struct clk_hw *hw)
+static int _alpha_pll_lucid_evo_prepare(struct clk_hw *hw, bool reset)
 {
 	struct clk_alpha_pll *pll = to_clk_alpha_pll(hw);
 	struct clk_hw *p;
@@ -2128,11 +2131,31 @@ static int alpha_pll_lucid_evo_prepare(struct clk_hw *hw)
 	if (ret)
 		return ret;
 
-	alpha_pll_lucid_evo_disable(hw);
+	_alpha_pll_lucid_evo_disable(hw, reset);
 
 	return 0;
 }
 
+static void alpha_pll_lucid_evo_disable(struct clk_hw *hw)
+{
+	_alpha_pll_lucid_evo_disable(hw, false);
+}
+
+static int alpha_pll_lucid_evo_prepare(struct clk_hw *hw)
+{
+	return _alpha_pll_lucid_evo_prepare(hw, false);
+}
+
+static void alpha_pll_reset_lucid_evo_disable(struct clk_hw *hw)
+{
+	_alpha_pll_lucid_evo_disable(hw, true);
+}
+
+static int alpha_pll_reset_lucid_evo_prepare(struct clk_hw *hw)
+{
+	return _alpha_pll_lucid_evo_prepare(hw, true);
+}
+
 static unsigned long alpha_pll_lucid_evo_recalc_rate(struct clk_hw *hw,
 						     unsigned long parent_rate)
 {
@@ -2179,3 +2202,14 @@ const struct clk_ops clk_alpha_pll_lucid_evo_ops = {
 	.set_rate = alpha_pll_lucid_5lpe_set_rate,
 };
 EXPORT_SYMBOL_GPL(clk_alpha_pll_lucid_evo_ops);
+
+const struct clk_ops clk_alpha_pll_reset_lucid_evo_ops = {
+	.prepare = alpha_pll_reset_lucid_evo_prepare,
+	.enable = alpha_pll_lucid_evo_enable,
+	.disable = alpha_pll_reset_lucid_evo_disable,
+	.is_enabled = clk_trion_pll_is_enabled,
+	.recalc_rate = alpha_pll_lucid_evo_recalc_rate,
+	.round_rate = clk_alpha_pll_round_rate,
+	.set_rate = alpha_pll_lucid_5lpe_set_rate,
+};
+EXPORT_SYMBOL_GPL(clk_alpha_pll_reset_lucid_evo_ops);
diff --git a/drivers/clk/qcom/clk-alpha-pll.h b/drivers/clk/qcom/clk-alpha-pll.h
index 0b7a6859ca2c..f2cc0de7313c 100644
--- a/drivers/clk/qcom/clk-alpha-pll.h
+++ b/drivers/clk/qcom/clk-alpha-pll.h
@@ -154,6 +154,7 @@ extern const struct clk_ops clk_alpha_pll_zonda_ops;
 #define clk_alpha_pll_postdiv_zonda_ops clk_alpha_pll_postdiv_fabia_ops
 
 extern const struct clk_ops clk_alpha_pll_lucid_evo_ops;
+extern const struct clk_ops clk_alpha_pll_reset_lucid_evo_ops;
 extern const struct clk_ops clk_alpha_pll_fixed_lucid_evo_ops;
 extern const struct clk_ops clk_alpha_pll_postdiv_lucid_evo_ops;
 
-- 
2.35.1