reset: stm32: adapt driver for stm32mp1

- move to livetree and allow to get address to parent
- add stm32mp1 compatible for probe

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>

drivers/reset/Kconfig

@@ -30,7 +30,7 @@ config STI_RESET
 
 config STM32_RESET
 	bool "Enable the STM32 reset"
-	depends on STM32
+	depends on STM32 || ARCH_STM32MP
 	help
 	  Support for reset controllers on STMicroelectronics STM32 family SoCs.
 	  This resset driver is compatible with STM32 F4/F7 and H7 SoCs.

drivers/reset/stm32-reset.c

@@ -11,7 +11,13 @@
 #include <reset-uclass.h>
 #include <asm/io.h>
 
-DECLARE_GLOBAL_DATA_PTR;
+/* reset clear offset for STM32MP RCC */
+#define RCC_CL 0x4
+
+enum rcc_type {
+	RCC_STM32 = 0,
+	RCC_STM32MP,
+};
 
 struct stm32_reset_priv {
 	fdt_addr_t base;
@@ -35,7 +41,11 @@ static int stm32_reset_assert(struct reset_ctl *reset_ctl)
 	debug("%s: reset id = %ld bank = %d offset = %d)\n", __func__,
 	      reset_ctl->id, bank, offset);
 
-	setbits_le32(priv->base + bank, BIT(offset));
+	if (dev_get_driver_data(reset_ctl->dev) == RCC_STM32MP)
+		/* reset assert is done in rcc set register */
+		writel(BIT(offset), priv->base + bank);
+	else
+		setbits_le32(priv->base + bank, BIT(offset));
 
 	return 0;
 }
@@ -48,7 +58,11 @@ static int stm32_reset_deassert(struct reset_ctl *reset_ctl)
 	debug("%s: reset id = %ld bank = %d offset = %d)\n", __func__,
 	      reset_ctl->id, bank, offset);
 
-	clrbits_le32(priv->base + bank, BIT(offset));
+	if (dev_get_driver_data(reset_ctl->dev) == RCC_STM32MP)
+		/* reset deassert is done in rcc clr register */
+		writel(BIT(offset), priv->base + bank + RCC_CL);
+	else
+		clrbits_le32(priv->base + bank, BIT(offset));
 
 	return 0;
 }
@@ -64,16 +78,26 @@ static int stm32_reset_probe(struct udevice *dev)
 {
 	struct stm32_reset_priv *priv = dev_get_priv(dev);
 
-	priv->base = devfdt_get_addr(dev);
-	if (priv->base == FDT_ADDR_T_NONE)
-		return -EINVAL;
+	priv->base = dev_read_addr(dev);
+	if (priv->base == FDT_ADDR_T_NONE) {
+		/* for MFD, get address of parent */
+		priv->base = dev_read_addr(dev->parent);
+		if (priv->base == FDT_ADDR_T_NONE)
+			return -EINVAL;
+	}
 
 	return 0;
 }
 
+static const struct udevice_id stm32_reset_ids[] = {
+	{ .compatible = "st,stm32mp1-rcc-rst", .data = RCC_STM32MP },
+	{ }
+};
+
 U_BOOT_DRIVER(stm32_rcc_reset) = {
 	.name			= "stm32_rcc_reset",
 	.id			= UCLASS_RESET,
+	.of_match		= stm32_reset_ids,
 	.probe			= stm32_reset_probe,
 	.priv_auto_alloc_size	= sizeof(struct stm32_reset_priv),
 	.ops			= &stm32_reset_ops,