clk: qcom: rcg2: add clk_rcg2_shared_floor_ops

Generally SDCC clocks use clk_rcg2_floor_ops, however on SAR2130P
platform it's recommended to use rcg2_shared_ops for all Root Clock
Generators to park them instead of disabling. Implement a mix of those,
clk_rcg2_shared_floor_ops.

Signed-off-by: Dmitry Baryshkov <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Bjorn Andersson <[email protected]>

Author: lumag

drivers/clk/qcom/clk-rcg.h

@@ -198,6 +198,7 @@ extern const struct clk_ops clk_byte2_ops;
 extern const struct clk_ops clk_pixel_ops;
 extern const struct clk_ops clk_gfx3d_ops;
 extern const struct clk_ops clk_rcg2_shared_ops;
+extern const struct clk_ops clk_rcg2_shared_floor_ops;
 extern const struct clk_ops clk_rcg2_shared_no_init_park_ops;
 extern const struct clk_ops clk_dp_ops;
 

drivers/clk/qcom/clk-rcg2.c

@@ -1186,15 +1186,23 @@ clk_rcg2_shared_force_enable_clear(struct clk_hw *hw, const struct freq_tbl *f)
 	return clk_rcg2_clear_force_enable(hw);
 }
 
-static int clk_rcg2_shared_set_rate(struct clk_hw *hw, unsigned long rate,
-				    unsigned long parent_rate)
+static int __clk_rcg2_shared_set_rate(struct clk_hw *hw, unsigned long rate,
+				      unsigned long parent_rate,
+				      enum freq_policy policy)
 {
 	struct clk_rcg2 *rcg = to_clk_rcg2(hw);
 	const struct freq_tbl *f;
 
-	f = qcom_find_freq(rcg->freq_tbl, rate);
-	if (!f)
+	switch (policy) {
+	case FLOOR:
+		f = qcom_find_freq_floor(rcg->freq_tbl, rate);
+		break;
+	case CEIL:
+		f = qcom_find_freq(rcg->freq_tbl, rate);
+		break;
+	default:
 		return -EINVAL;
+	}
 
 	/*
 	 * In case clock is disabled, update the M, N and D registers, cache
@@ -1207,10 +1215,28 @@ static int clk_rcg2_shared_set_rate(struct clk_hw *hw, unsigned long rate,
 	return clk_rcg2_shared_force_enable_clear(hw, f);
 }
 
+static int clk_rcg2_shared_set_rate(struct clk_hw *hw, unsigned long rate,
+				    unsigned long parent_rate)
+{
+	return __clk_rcg2_shared_set_rate(hw, rate, parent_rate, CEIL);
+}
+
 static int clk_rcg2_shared_set_rate_and_parent(struct clk_hw *hw,
 		unsigned long rate, unsigned long parent_rate, u8 index)
 {
-	return clk_rcg2_shared_set_rate(hw, rate, parent_rate);
+	return __clk_rcg2_shared_set_rate(hw, rate, parent_rate, CEIL);
+}
+
+static int clk_rcg2_shared_set_floor_rate(struct clk_hw *hw, unsigned long rate,
+					  unsigned long parent_rate)
+{
+	return __clk_rcg2_shared_set_rate(hw, rate, parent_rate, FLOOR);
+}
+
+static int clk_rcg2_shared_set_floor_rate_and_parent(struct clk_hw *hw,
+		unsigned long rate, unsigned long parent_rate, u8 index)
+{
+	return __clk_rcg2_shared_set_rate(hw, rate, parent_rate, FLOOR);
 }
 
 static int clk_rcg2_shared_enable(struct clk_hw *hw)
@@ -1348,6 +1374,18 @@ const struct clk_ops clk_rcg2_shared_ops = {
 };
 EXPORT_SYMBOL_GPL(clk_rcg2_shared_ops);
 
+const struct clk_ops clk_rcg2_shared_floor_ops = {
+	.enable = clk_rcg2_shared_enable,
+	.disable = clk_rcg2_shared_disable,
+	.get_parent = clk_rcg2_shared_get_parent,
+	.set_parent = clk_rcg2_shared_set_parent,
+	.recalc_rate = clk_rcg2_shared_recalc_rate,
+	.determine_rate = clk_rcg2_determine_floor_rate,
+	.set_rate = clk_rcg2_shared_set_floor_rate,
+	.set_rate_and_parent = clk_rcg2_shared_set_floor_rate_and_parent,
+};
+EXPORT_SYMBOL_GPL(clk_rcg2_shared_floor_ops);
+
 static int clk_rcg2_shared_no_init_park(struct clk_hw *hw)
 {
 	struct clk_rcg2 *rcg = to_clk_rcg2(hw);