arm: mediatek: add support for MediaTek MT8195 SoC

This adds basic support for MediaTek MT8195 SoC.

Add watchdog support by adding upstream compatible string.

Signed-off-by: Julien Stephan <jstephan@baylibre.com>

arch/arm/mach-mediatek/Kconfig

@@ -93,6 +93,15 @@ config TARGET_MT8188
           USB3.0 dual role, SD and MMC cards, UFS, PWM, I2C, I2S, S/PDIF, and
           several LPDDR3 and LPDDR4 options.
 
+config TARGET_MT8195
+	bool "MediaTek MT8195 SoC"
+	select ARM64
+	help
+	  The MediaTek MT8195 is a ARM64-based SoC with a quad-core Cortex-A73 and
+	  a quad-core Cortex-A53. It is including UART, SPI, USB3.0 dual role,
+	  SD and MMC cards, UFS, PWM, I2C, I2S, S/PDIF, and several LPDDR3
+	  and LPDDR4 options.
+
 config TARGET_MT8365
 	bool "MediaTek MT8365 SoC"
 	select ARM64
@@ -165,7 +174,7 @@ config SYS_CONFIG_NAME
 config MTK_BROM_HEADER_INFO
 	string
 	default "media=nor" if TARGET_MT8518 || TARGET_MT8512 || TARGET_MT7629
-	default "media=emmc" if TARGET_MT8516 || TARGET_MT8365 || TARGET_MT8183 || TARGET_MT8188
+	default "media=emmc" if TARGET_MT8516 || TARGET_MT8365 || TARGET_MT8183 || TARGET_MT8188 || TARGET_MT8195
 	default "lk=1" if TARGET_MT7623
 
 config MTK_TZ_MOVABLE

arch/arm/mach-mediatek/Makefile

@@ -13,6 +13,7 @@ obj-$(CONFIG_TARGET_MT7987) += mt7987/
 obj-$(CONFIG_TARGET_MT7988) += mt7988/
 obj-$(CONFIG_TARGET_MT8183) += mt8183/
 obj-$(CONFIG_TARGET_MT8188) += mt8188/
+obj-$(CONFIG_TARGET_MT8195) += mt8195/
 obj-$(CONFIG_TARGET_MT8365) += mt8365/
 obj-$(CONFIG_TARGET_MT8512) += mt8512/
 obj-$(CONFIG_TARGET_MT8516) += mt8516/

arch/arm/mach-mediatek/mt8195/Makefile

@@ -0,0 +1,3 @@
+# SPDX-License-Identifier:	GPL-2.0
+
+obj-y += init.o

arch/arm/mach-mediatek/mt8195/init.c

@@ -0,0 +1,91 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2026 MediaTek Inc.
+ * Copyright (C) 2026 BayLibre, SAS
+ * Author: Julien Stephan <jstephan@baylibre.com>
+ *         Chris-QJ Chen <chris-qj.chen@mediatek.com>
+ */
+
+#include <asm/armv8/mmu.h>
+#include <asm/system.h>
+#include <dm/uclass.h>
+#include <linux/sizes.h>
+#include <wdt.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+int dram_init(void)
+{
+	int ret;
+
+	ret = fdtdec_setup_memory_banksize();
+	if (ret)
+		return ret;
+
+	fdtdec_setup_mem_size_base();
+
+	/*
+	 * Limit gd->ram_top not exceeding SZ_4G.  Some periphals like mmc
+	 * requires DMA buffer allocated below SZ_4G.
+	 *
+	 * Note: SZ_1M is for adjusting gd->relocaddr, the reserved memory for
+	 * u-boot itself.
+	 */
+	if (gd->ram_base + gd->ram_size >= SZ_4G)
+		gd->mon_len = (gd->ram_base + gd->ram_size + SZ_1M) - SZ_4G;
+
+	return 0;
+}
+
+int dram_init_banksize(void)
+{
+	gd->bd->bi_dram[0].start = gd->ram_base;
+	gd->bd->bi_dram[0].size = gd->ram_size;
+
+	return 0;
+}
+
+int mtk_soc_early_init(void)
+{
+	return 0;
+}
+
+void reset_cpu(void)
+{
+	struct udevice *wdt;
+
+	if (IS_ENABLED(CONFIG_PSCI_RESET)) {
+		psci_system_reset();
+	} else {
+		uclass_first_device(UCLASS_WDT, &wdt);
+		if (wdt)
+			wdt_expire_now(wdt, 0);
+	}
+}
+
+int print_cpuinfo(void)
+{
+	printf("CPU:   MediaTek MT8195\n");
+	return 0;
+}
+
+static struct mm_region mt8195_mem_map[] = {
+	{
+		/* DDR */
+		.virt = 0x40000000UL,
+		.phys = 0x40000000UL,
+		.size = 0x200000000UL,
+		.attrs = PTE_BLOCK_MEMTYPE(MT_NORMAL) | PTE_BLOCK_OUTER_SHARE,
+	}, {
+		.virt = 0x00000000UL,
+		.phys = 0x00000000UL,
+		.size = 0x20000000UL,
+		.attrs = PTE_BLOCK_MEMTYPE(MT_DEVICE_NGNRNE) |
+			 PTE_BLOCK_NON_SHARE |
+			 PTE_BLOCK_PXN | PTE_BLOCK_UXN
+	}, {
+		0,
+	}
+};
+
+struct mm_region *mem_map = mt8195_mem_map;

drivers/watchdog/mtk_wdt.c

@@ -146,6 +146,7 @@ static const struct udevice_id mtk_wdt_ids[] = {
 	{ .compatible = "mediatek,mt6589-wdt"},
 	{ .compatible = "mediatek,mt7986-wdt" },
 	{ .compatible = "mediatek,mt8188-wdt" },
+	{ .compatible = "mediatek,mt8195-wdt" },
 	{}
 };