[PATCH AUTOSEL 6.6 13/24] clk: qcom: rcg2: add clk_rcg2_shared_floor_ops

[Sasha Levin <sashal@kernel.org>]

From: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

[ Upstream commit aec8c0e28ce4a1f89fd82fcc06a5cc73147e9817 ]

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 <dmitry.baryshkov@linaro.org>
Link: https://lore.kernel.org/r/20241027-sar2130p-clocks-v5-6-ecad2a1432ba@linaro.org
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/clk/qcom/clk-rcg.h  |  1 +
 drivers/clk/qcom/clk-rcg2.c | 48 +++++++++++++++++++++++++++++++++----
 2 files changed, 44 insertions(+), 5 deletions(-)

diff --git a/drivers/clk/qcom/clk-rcg.h b/drivers/clk/qcom/clk-rcg.h
index 84c497f361bc6..7d0f925960559 100644
--- a/drivers/clk/qcom/clk-rcg.h
+++ b/drivers/clk/qcom/clk-rcg.h
@@ -176,6 +176,7 @@ 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;
 
diff --git a/drivers/clk/qcom/clk-rcg2.c b/drivers/clk/qcom/clk-rcg2.c
index 461f54fe5e4f1..fae1c07982aba 100644
--- a/drivers/clk/qcom/clk-rcg2.c
+++ b/drivers/clk/qcom/clk-rcg2.c
@@ -1020,15 +1020,23 @@ 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
@@ -1041,10 +1049,28 @@ 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)
@@ -1182,6 +1208,18 @@ 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);
-- 
2.43.0