soc/mediatek/mt8188: Add AUXADC support

TEST=get voltage as 340mV for channel 0 in MTK EVB.
BUG=b:233720142

Signed-off-by: Hui Liu <hui.liu@mediatek.corp-partner.google.com>
Change-Id: Idd1edcce6cb62fcf6991bb9342c409150989c5ca
Reviewed-on: https://review.coreboot.org/c/coreboot/+/66121
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Yu-Ping Wu <yupingso@google.com>

src/soc/mediatek/mt8188/Makefile.inc

@@ -21,6 +21,7 @@ romstage-y += ../common/pmif.c ../common/pmif_clk.c pmif_clk.c
 romstage-y += ../common/pmif_spi.c pmif_spi.c
 romstage-y += ../common/pmif_spmi.c pmif_spmi.c
 
+ramstage-y += ../common/auxadc.c
 ramstage-y += emi.c
 ramstage-y += ../common/mcu.c
 ramstage-y += ../common/mcupm.c

src/soc/mediatek/mt8188/include/soc/auxadc.h

@@ -0,0 +1,17 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+/*
+ * This file is created based on MT8188 Functional Specification
+ * Chapter number: 5.10
+ */
+
+#ifndef SOC_MEDIATEK_MT8188_AUXADC_H
+#define SOC_MEDIATEK_MT8188_AUXADC_H
+
+#include <soc/auxadc_common.h>
+#include <soc/infracfg.h>
+#include <stdint.h>
+
+static struct mt8188_infracfg_ao_regs *const mtk_infracfg = mt8188_infracfg_ao;
+
+#endif

src/soc/mediatek/mt8188/include/soc/efuse.h

@@ -0,0 +1,17 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#ifndef SOC_MEDIATEK_MT8188_EFUSE_H
+#define SOC_MEDIATEK_MT8188_EFUSE_H
+
+#include <soc/addressmap.h>
+#include <types.h>
+
+struct efuse_regs {
+	uint32_t reserved[107];
+	uint32_t adc_cali_reg;
+};
+
+check_member(efuse_regs, adc_cali_reg, 0x1AC);
+static struct efuse_regs *const mtk_efuse = (void *)EFUSE_BASE;
+
+#endif