clk: qcom: alpha-pll: add support for power off mode for lucid evo PLL

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>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20220908222850.3552050-3-dmitry.baryshkov@linaro.org

drivers/clk/qcom/clk-alpha-pll.c

@@ -2088,7 +2088,7 @@ 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;
@@ -2117,9 +2117,12 @@ 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;
@@ -2139,11 +2142,31 @@ 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)
 {
@@ -2191,6 +2214,17 @@ const struct clk_ops clk_alpha_pll_lucid_evo_ops = {
 };
 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);
+
 void clk_rivian_evo_pll_configure(struct clk_alpha_pll *pll, struct regmap *regmap,
 				  const struct alpha_pll_config *config)
 {

drivers/clk/qcom/clk-alpha-pll.h

@@ -155,6 +155,7 @@ 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;