mediatek: clean up platform kernel modules

Remove kmod-sdhci-mtk as the mtk-sd driver is built-in anyway for the
relevant subtargets in order to support mounting rootfs from eMMC or
SD card.

Add kmod-iio-mt6577-auxadc to support reading the raw values from the
auxadc unit used as in-SoC thermal sensor. This driver was previously
built-in, but as thermal itself works well without it there is no use
for it in every day use of a device. Build the module to still allow
access to the raw values for those who need it.

Signed-off-by: Daniel Golle <[email protected]>

target/linux/mediatek/filogic/config-5.15

@@ -183,7 +183,6 @@ CONFIG_I2C_BOARDINFO=y
 CONFIG_I2C_CHARDEV=y
 CONFIG_I2C_MT65XX=y
 CONFIG_ICPLUS_PHY=y
-CONFIG_IIO=y
 CONFIG_ILLEGAL_POINTER_VALUE=0xdead000000000000
 CONFIG_INITRAMFS_SOURCE=""
 CONFIG_IO_URING=y
@@ -205,7 +204,6 @@ CONFIG_MDIO_BUS=y
 CONFIG_MDIO_DEVICE=y
 CONFIG_MDIO_DEVRES=y
 CONFIG_MEDIATEK_GE_PHY=y
-CONFIG_MEDIATEK_MT6577_AUXADC=y
 CONFIG_MEDIATEK_WATCHDOG=y
 CONFIG_MEMFD_CREATE=y
 CONFIG_MESSAGE_LOGLEVEL_DEFAULT=7

target/linux/mediatek/modules.mk

@@ -27,16 +27,13 @@ endef
 
 $(eval $(call KernelPackage,btmtkuart))
 
-define KernelPackage/sdhci-mtk
-  SUBMENU:=Other modules
-  TITLE:=Mediatek SDHCI driver
-  DEPENDS:=@TARGET_mediatek_mt7622 +kmod-sdhci
-  KCONFIG:=CONFIG_MMC_MTK 
+define KernelPackage/iio-mt6577-auxadc
+  TITLE:=Mediatek AUXADC driver
+  DEPENDS:=@(TARGET_mediatek_mt7622||TARGET_mediatek_mt7623||TARGET_mediatek_filogic)
+  KCONFIG:=CONFIG_MEDIATEK_MT6577_AUXADC
   FILES:= \
-	$(LINUX_DIR)/drivers/mmc/host/mtk-sd.ko
-  AUTOLOAD:=$(call AutoProbe,mtk-sd,1)
+	$(LINUX_DIR)/drivers/iio/adc/mt6577_auxadc.ko
+  AUTOLOAD:=$(call AutoProbe,mt6577_auxadc)
+  $(call AddDepends/iio)
 endef
-
-$(eval $(call KernelPackage,sdhci-mtk))
-
-
+$(eval $(call KernelPackage,iio-mt6577-auxadc))

target/linux/mediatek/mt7623/config-5.15

@@ -267,7 +267,6 @@ CONFIG_I2C_BOARDINFO=y
 CONFIG_I2C_CHARDEV=y
 CONFIG_I2C_MT65XX=y
 CONFIG_ICPLUS_PHY=y
-CONFIG_IIO=y
 CONFIG_INITRAMFS_SOURCE=""
 CONFIG_INPUT=y
 CONFIG_INPUT_EVDEV=y
@@ -321,7 +320,6 @@ CONFIG_MDIO_DEVICE=y
 CONFIG_MDIO_DEVRES=y
 CONFIG_MDIO_GPIO=y
 CONFIG_MEDIATEK_GE_PHY=y
-CONFIG_MEDIATEK_MT6577_AUXADC=y
 CONFIG_MEDIATEK_WATCHDOG=y
 CONFIG_MEMFD_CREATE=y
 CONFIG_MEMORY=y