clk: stm32: introduce clocks for STM32MP257 platform

This driver is intended for the STM32MP25 clock family and utilizes
the stm32-core API, similar to the stm32mp13 clock driver.

Signed-off-by: Gabriel Fernandez <gabriel.fernandez@foss.st.com>
Link: https://lore.kernel.org/r/20240411092453.243633-4-gabriel.fernandez@foss.st.com
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

drivers/clk/stm32/Kconfig

@@ -25,5 +25,12 @@ config COMMON_CLK_STM32MP157
 	help
 	  Support for stm32mp15x SoC family clocks.
 
+config COMMON_CLK_STM32MP257
+	bool "Clock driver for stm32mp25x clocks"
+	depends on ARM64 || COMPILE_TEST
+	default y
+	help
+	  Support for stm32mp25x SoC family clocks.
+
 endif
 

drivers/clk/stm32/Makefile

@@ -1,2 +1,3 @@
 obj-$(CONFIG_COMMON_CLK_STM32MP135)	+= clk-stm32mp13.o clk-stm32-core.o reset-stm32.o
 obj-$(CONFIG_COMMON_CLK_STM32MP157)	+= clk-stm32mp1.o reset-stm32.o
+obj-$(CONFIG_COMMON_CLK_STM32MP257)	+= clk-stm32mp25.o clk-stm32-core.o reset-stm32.o

drivers/clk/stm32/reset-stm32.c

@@ -19,6 +19,7 @@ struct stm32_reset_data {
 	struct reset_controller_dev	rcdev;
 	void __iomem			*membase;
 	u32				clear_offset;
+	const struct stm32_reset_cfg	**reset_lines;
 };
 
 static inline struct stm32_reset_data *
@@ -27,22 +28,46 @@ to_stm32_reset_data(struct reset_controller_dev *rcdev)
 	return container_of(rcdev, struct stm32_reset_data, rcdev);
 }
 
+static const struct stm32_reset_cfg *stm32_get_reset_line(struct reset_controller_dev *rcdev,
+							  unsigned long id,
+							  struct stm32_reset_cfg *line)
+{
+	struct stm32_reset_data *data = to_stm32_reset_data(rcdev);
+
+	if (!data->reset_lines) {
+		int reg_width = sizeof(u32);
+		int bank = id / (reg_width * BITS_PER_BYTE);
+		int offset = id % (reg_width * BITS_PER_BYTE);
+
+		line->offset = bank * reg_width;
+		line->bit_idx = offset;
+		line->set_clr = (data->clear_offset ? true : false);
+
+		return line;
+	}
+
+	return data->reset_lines[id];
+}
+
 static int stm32_reset_update(struct reset_controller_dev *rcdev,
 			      unsigned long id, bool assert)
 {
 	struct stm32_reset_data *data = to_stm32_reset_data(rcdev);
-	int reg_width = sizeof(u32);
-	int bank = id / (reg_width * BITS_PER_BYTE);
-	int offset = id % (reg_width * BITS_PER_BYTE);
+	struct stm32_reset_cfg line_reset;
+	const struct stm32_reset_cfg *ptr_line;
 
-	if (data->clear_offset) {
+	ptr_line = stm32_get_reset_line(rcdev, id, &line_reset);
+	if (!ptr_line)
+		return -EPERM;
+
+	if (ptr_line->set_clr) {
 		void __iomem *addr;
 
-		addr = data->membase + (bank * reg_width);
+		addr = data->membase + ptr_line->offset;
 		if (!assert)
 			addr += data->clear_offset;
 
-		writel(BIT(offset), addr);
+		writel(BIT(ptr_line->bit_idx), addr);
 
 	} else {
 		unsigned long flags;
@@ -50,14 +75,14 @@ static int stm32_reset_update(struct reset_controller_dev *rcdev,
 
 		spin_lock_irqsave(&data->lock, flags);
 
-		reg = readl(data->membase + (bank * reg_width));
+		reg = readl(data->membase + ptr_line->offset);
 
 		if (assert)
-			reg |= BIT(offset);
+			reg |= BIT(ptr_line->bit_idx);
 		else
-			reg &= ~BIT(offset);
+			reg &= ~BIT(ptr_line->bit_idx);
 
-		writel(reg, data->membase + (bank * reg_width));
+		writel(reg, data->membase + ptr_line->offset);
 
 		spin_unlock_irqrestore(&data->lock, flags);
 	}
@@ -81,14 +106,17 @@ static int stm32_reset_status(struct reset_controller_dev *rcdev,
 			      unsigned long id)
 {
 	struct stm32_reset_data *data = to_stm32_reset_data(rcdev);
-	int reg_width = sizeof(u32);
-	int bank = id / (reg_width * BITS_PER_BYTE);
-	int offset = id % (reg_width * BITS_PER_BYTE);
+	struct stm32_reset_cfg line_reset;
+	const struct stm32_reset_cfg *ptr_line;
 	u32 reg;
 
-	reg = readl(data->membase + (bank * reg_width));
+	ptr_line = stm32_get_reset_line(rcdev, id, &line_reset);
+	if (!ptr_line)
+		return -EPERM;
 
-	return !!(reg & BIT(offset));
+	reg = readl(data->membase + ptr_line->offset);
+
+	return !!(reg & BIT(ptr_line->bit_idx));
 }
 
 static const struct reset_control_ops stm32_reset_ops = {
@@ -113,6 +141,7 @@ int stm32_rcc_reset_init(struct device *dev, struct clk_stm32_reset_data *data,
 	reset_data->rcdev.ops = &stm32_reset_ops;
 	reset_data->rcdev.of_node = dev_of_node(dev);
 	reset_data->rcdev.nr_resets = data->nr_lines;
+	reset_data->reset_lines = data->reset_lines;
 	reset_data->clear_offset = data->clear_offset;
 
 	return reset_controller_register(&reset_data->rcdev);

drivers/clk/stm32/reset-stm32.h

@@ -4,8 +4,15 @@
  * Author: Gabriel Fernandez <gabriel.fernandez@foss.st.com> for STMicroelectronics.
  */
 
+struct stm32_reset_cfg {
+	u16 offset;
+	u8 bit_idx;
+	bool set_clr;
+};
+
 struct clk_stm32_reset_data {
 	const struct reset_control_ops *ops;
+	const struct stm32_reset_cfg **reset_lines;
 	unsigned int nr_lines;
 	u32 clear_offset;
 };