board: samsung: introduce herolte

Decon is a bit different from newer exynoses.

board/Kconfig

@@ -71,6 +71,13 @@ menu "Device Support"
 		help
 		  Say Y if you want to include support for Samsung Galaxy S22+
 
+	config SAMSUNG_HEROLTE
+		bool "Support for Samsung Galaxy S7"
+		default n
+		depends on EXYNOS_8890
+		help
+		  Say Y if you want to include support for Samsung Galaxy S7
+
 	config SAMSUNG_NOBLELTE
 		bool "Support for Samsung Galaxy Note5"
 		default n

board/Makefile

@@ -6,6 +6,7 @@ lib-$(CONFIG_SAMSUNG_A105F) += samsung/board-a105f.o
 lib-$(CONFIG_SAMSUNG_A127F) += samsung/board-a127f.o
 lib-$(CONFIG_SAMSUNG_A3XELTE) += samsung/board-a3xelte.o
 lib-$(CONFIG_SAMSUNG_C1S) += samsung/board-c1s.o
+lib-$(CONFIG_SAMSUNG_HEROLTE) += samsung/board-herolte.o
 lib-$(CONFIG_SAMSUNG_G0S) += samsung/board-g0s.o
 lib-$(CONFIG_SAMSUNG_NOBLELTE) += samsung/board-noblelte.o
 lib-$(CONFIG_SAMSUNG_JACKPOTLTE) += samsung/board-jackpotlte.o

board/samsung/board-herolte.c

@@ -0,0 +1,61 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (c) 2025, Ivaylo Ivanov <ivo.ivanov.ivanov1@gmail.com>
+ */
+#include <board.h>
+#include <stdint.h>
+#include <string.h>
+#include <drivers/framework.h>
+#include <lib/simplefb.h>
+#include <lib/debug.h>
+
+#define DECON_F_BASE				0x13960000
+#define HW_SW_TRIG_CONTROL			0x70
+#define HW_SW_TRIG_CONTROL_TRIG_AUTO_MASK_TRIG	(1 << 12)
+#define HW_SW_TRIG_CONTROL_SW_TRIG		(1 << 8)
+#define HW_SW_TRIG_CONTROL_UNKN_BIT		(1 << 7)
+#define HW_SW_TRIG_CONTROL_HW_TRIG_MASK		(1 << 5)
+#define HW_SW_TRIG_CONTROL_HW_TRIG_EN		(1 << 4)
+#define HW_TRIG_EN				(HW_SW_TRIG_CONTROL_TRIG_AUTO_MASK_TRIG | \
+						 HW_SW_TRIG_CONTROL_HW_TRIG_EN)
+
+int herolte_init(void)
+{
+	/* allow framebuffer to be written to */
+	writel(HW_TRIG_EN, (void *)(DECON_F_BASE + HW_SW_TRIG_CONTROL));
+
+	return 0;
+}
+
+#ifdef CONFIG_SIMPLE_FB
+static struct video_info herolte_fb = {
+	.format = FB_FORMAT_ARGB8888,
+	.width = 1440,
+	.height = 2960,
+	.stride = 4,
+	.address = (void *)0xe2a00000
+};
+#endif
+
+int herolte_drv(void)
+{
+#ifdef CONFIG_SIMPLE_FB
+	REGISTER_DRIVER("simplefb", simplefb_probe, &herolte_fb);
+#endif
+	return 0;
+}
+
+int herolte_late_init(void)
+{
+	return 0;
+}
+
+struct board_data board_ops = {
+	.name = "samsung-herolte",
+	.ops = {
+		.early_init = herolte_init,
+		.drivers_init = herolte_drv,
+		.late_init = herolte_late_init,
+	},
+	.quirks = 0
+};

configs/herolte_defconfig

@@ -0,0 +1,6 @@
+CONFIG_POSITION_INDEPENDENT=y
+CONFIG_EXYNOS_8890=y
+CONFIG_SAMSUNG_HEROLTE=y
+CONFIG_TEXT_BASE=0x87000000
+CONFIG_PAYLOAD_ENTRY=0x90000000
+CONFIG_RAMDISK_ENTRY=0x84000000

soc/Kconfig

@@ -88,6 +88,13 @@ config QUALCOMM
 		help
 		  Say Y if your device uses Samsung Exynos7885 SoC
 
+	config EXYNOS_8890
+		bool "Support for Exynos 8890"
+		default n
+		select EXYNOS
+		help
+		  Say Y if your device uses Samsung Exynos8890 SoC
+
 	config EXYNOS_8895
 		bool "Support for Exynos 8895"
 		default n