soc/mediatek/mt8186: Add a stub implementation of the MT8186 SoC

Add new folder and basic drivers for Mediatek SoC 'MT8186'.

Difference of modules including in this patch between MT8186 and existing SoCs:
Timer:
	Similar to MT8195, MT8186 uses v2 timer.
EMI/PLL/SPI:
	Different from existing SoCs.

TEST=boot from SPI-NOR and show uart log on MT8186 EVB
BUG=b:200134633

Signed-off-by: Rex-BC Chen <rex-bc.chen@mediatek.com>
Change-Id: I579f79c15f4bf5e1daf6b35c70cfd00a985a0b81
Reviewed-on: https://review.coreboot.org/c/coreboot/+/58640
Reviewed-by: Rex-BC Chen <rex-bc.chen@mediatek.corp-partner.google.com>
Reviewed-by: Yu-Ping Wu <yupingso@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

1 files changed, 29 insertions, 0 deletions

diff --git a/src/soc/mediatek/mt8186/soc.c b/src/soc/mediatek/mt8186/soc.c
new file mode 100644
index 0000000000..360893ceee
--- /dev/null
+++ b/src/soc/mediatek/mt8186/soc.c
@@ -0,0 +1,29 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <device/device.h>
+#include <soc/emi.h>
+#include <symbols.h>
+
+static void soc_read_resources(struct device *dev)
+{
+	ram_resource(dev, 0, (uintptr_t)_dram / KiB, sdram_size() / KiB);
+}
+
+static void soc_init(struct device *dev)
+{
+}
+
+static struct device_operations soc_ops = {
+	.read_resources = soc_read_resources,
+	.init = soc_init,
+};
+
+static void enable_soc_dev(struct device *dev)
+{
+	dev->ops = &soc_ops;
+}
+
+struct chip_operations soc_mediatek_mt8186_ops = {
+	CHIP_NAME("SOC Mediatek MT8186")
+	.enable_dev = enable_soc_dev,
+};