[PATCH v4 10/14] clk: stm32mp13: add multi mux function

[<gabriel.fernandez@foss.st.com>]

From: Gabriel Fernandez <gabriel.fernandez@foss.st.com>

Some RCC muxes can manages two output clocks with same register.

Signed-off-by: Gabriel Fernandez <gabriel.fernandez@foss.st.com>
---
 drivers/clk/stm32/clk-stm32-core.c | 10 ++++++++++
 drivers/clk/stm32/clk-stm32-core.h |  2 ++
 drivers/clk/stm32/clk-stm32mp13.c  | 30 ++++++++++++++++++++++++++++++
 3 files changed, 42 insertions(+)

diff --git a/drivers/clk/stm32/clk-stm32-core.c b/drivers/clk/stm32/clk-stm32-core.c
index 70014c15d15f..e5a22bb09495 100644
--- a/drivers/clk/stm32/clk-stm32-core.c
+++ b/drivers/clk/stm32/clk-stm32-core.c
@@ -472,6 +472,16 @@ static int clk_stm32_composite_set_parent(struct clk_hw *hw, u8 index)
 
 	spin_unlock_irqrestore(composite->lock, flags);
 
+	if (composite->clock_data->is_multi_mux) {
+		struct clk_hw *other_mux_hw = composite->clock_data->is_multi_mux(hw);
+
+		if (other_mux_hw) {
+			struct clk_hw *hwp = clk_hw_get_parent_by_index(hw, index);
+
+			clk_hw_reparent(other_mux_hw, hwp);
+		}
+	}
+
 	return 0;
 }
 
diff --git a/drivers/clk/stm32/clk-stm32-core.h b/drivers/clk/stm32/clk-stm32-core.h
index 5f4c81cce170..dab1b65b2537 100644
--- a/drivers/clk/stm32/clk-stm32-core.h
+++ b/drivers/clk/stm32/clk-stm32-core.h
@@ -61,6 +61,7 @@ struct clk_stm32_clock_data {
 	const struct stm32_gate_cfg	*gates;
 	const struct stm32_mux_cfg	*muxes;
 	const struct stm32_div_cfg	*dividers;
+	struct clk_hw *(*is_multi_mux)(struct clk_hw *hw);
 };
 
 struct stm32_rcc_match_data {
@@ -72,6 +73,7 @@ struct stm32_rcc_match_data {
 	u32				clear_offset;
 	int (*check_security)(void __iomem *base,
 			      const struct clock_config *cfg);
+	int (*multi_mux)(void __iomem *base, const struct clock_config *cfg);
 };
 
 int stm32_rcc_reset_init(struct device *dev, const struct of_device_id *match,
diff --git a/drivers/clk/stm32/clk-stm32mp13.c b/drivers/clk/stm32/clk-stm32mp13.c
index 9edd32018f8f..08e3fe05d6d0 100644
--- a/drivers/clk/stm32/clk-stm32mp13.c
+++ b/drivers/clk/stm32/clk-stm32mp13.c
@@ -1469,6 +1469,35 @@ static int stm32mp13_clock_is_provided_by_secure(void __iomem *base,
 	return 0;
 }
 
+struct multi_mux {
+	struct clk_hw *hw1;
+	struct clk_hw *hw2;
+};
+
+static struct multi_mux *stm32_mp13_multi_mux[MUX_NB] = {
+	[MUX_SPI23]	= &(struct multi_mux){ &spi2_k.hw,	&spi3_k.hw },
+	[MUX_I2C12]	= &(struct multi_mux){ &i2c1_k.hw,	&i2c2_k.hw },
+	[MUX_LPTIM45]	= &(struct multi_mux){ &lptim4_k.hw,	&lptim5_k.hw },
+	[MUX_UART35]	= &(struct multi_mux){ &usart3_k.hw,	&uart5_k.hw },
+	[MUX_UART78]	= &(struct multi_mux){ &uart7_k.hw,	&uart8_k.hw },
+	[MUX_SAI1]	= &(struct multi_mux){ &sai1_k.hw,	&adfsdm_k.hw },
+};
+
+static struct clk_hw *stm32mp13_is_multi_mux(struct clk_hw *hw)
+{
+	struct clk_stm32_composite *composite = to_clk_stm32_composite(hw);
+	struct multi_mux *mmux = stm32_mp13_multi_mux[composite->mux_id];
+
+	if (mmux) {
+		if (!(mmux->hw1 == hw))
+			return mmux->hw1;
+		else
+			return mmux->hw2;
+	}
+
+	return NULL;
+}
+
 static u16 stm32mp13_cpt_gate[GATE_NB];
 
 static struct clk_stm32_clock_data stm32mp13_clock_data = {
@@ -1476,6 +1505,7 @@ static struct clk_stm32_clock_data stm32mp13_clock_data = {
 	.gates		= stm32mp13_gates,
 	.muxes		= stm32mp13_muxes,
 	.dividers	= stm32mp13_dividers,
+	.is_multi_mux	= stm32mp13_is_multi_mux,
 };
 
 static const struct stm32_rcc_match_data stm32mp13_data = {
-- 
2.25.1