kernel: Build: Split kmod-regmap

This reduces the needed modifications to the mainline Linux kernel and
also makes the regmap package work with an out of tree kernel which
does not have these modifications.

The regmap-core is only added when it is really build as a module.
The regmap-core is normally bool so it cannot be built as a module in an
unmodified kernel. When it is selected by on other kernel module it will
always be selected as build in and it also does not show up in
$(LINUX_DIR)/modules.builtin as it is not supposed to be a kernel module.
When it is not in $(LINUX_DIR)/modules.builtin the build system expects
it to be built as a .ko file.
Just check if the module is really there and only add it in that case.

This splits the regmap package into multiple packages, one for each bus type.
This way only the bus maps which are really needed have to be added.
This also splits the I2C, SPI and MMIO regmap into separate packages to not
require all these subsystems to build them, on an unmodified upstream kernel
this also causes problems in some situations.

Signed-off-by: Hauke Mehrtens <hauke.mehrtens@intel.com>

6 files changed, 76 insertions, 37 deletions

diff --git a/package/kernel/linux/modules/can.mk b/package/kernel/linux/modules/can.mk
index 4154ceba725..b0d254511bb 100644
--- a/package/kernel/linux/modules/can.mk
+++ b/package/kernel/linux/modules/can.mk
@@ -99,7 +99,7 @@ $(eval $(call KernelPackage,can-c-can-pci))
 define KernelPackage/can-c-can-platform
   TITLE:=Platform Bus based BOSCH C_CAN/D_CAN driver
   KCONFIG:=CONFIG_CAN_C_CAN_PLATFORM
-  DEPENDS:=kmod-can-c-can +!LINUX_3_18:kmod-regmap
+  DEPENDS:=kmod-can-c-can +!LINUX_3_18:kmod-regmap-core
   FILES:=$(LINUX_DIR)/drivers/net/can/c_can/c_can_platform.ko
   AUTOLOAD:=$(call AutoProbe,c_can_platform)
   $(call AddDepends/can)
diff --git a/package/kernel/linux/modules/hwmon.mk b/package/kernel/linux/modules/hwmon.mk
index 89a425b10c3..bf2860881ea 100644
--- a/package/kernel/linux/modules/hwmon.mk
+++ b/package/kernel/linux/modules/hwmon.mk
@@ -112,7 +112,7 @@ define KernelPackage/hwmon-ina2xx
   KCONFIG:=CONFIG_SENSORS_INA2XX
   FILES:=$(LINUX_DIR)/drivers/hwmon/ina2xx.ko
   AUTOLOAD:=$(call AutoProbe,ina2xx)
-  $(call AddDepends/hwmon,+kmod-i2c-core +!LINUX_3_18:kmod-regmap)
+  $(call AddDepends/hwmon,+kmod-i2c-core +!LINUX_3_18:kmod-regmap-i2c)
 endef
 
 define KernelPackage/hwmon-ina2xx/description
@@ -142,7 +142,7 @@ define KernelPackage/hwmon-lm63
   KCONFIG:=CONFIG_SENSORS_LM63
   FILES:=$(LINUX_DIR)/drivers/hwmon/lm63.ko
   AUTOLOAD:=$(call AutoProbe,lm63)
-  $(call AddDepends/hwmon,+kmod-i2c-core +kmod-regmap)
+  $(call AddDepends/hwmon,+kmod-i2c-core +kmod-regmap-i2c)
 endef
 
 define KernelPackage/hwmon-lm63/description
@@ -157,7 +157,7 @@ define KernelPackage/hwmon-lm75
   KCONFIG:=CONFIG_SENSORS_LM75
   FILES:=$(LINUX_DIR)/drivers/hwmon/lm75.ko
   AUTOLOAD:=$(call AutoProbe,lm75)
-  $(call AddDepends/hwmon,+kmod-i2c-core +PACKAGE_kmod-thermal:kmod-thermal +kmod-regmap)
+  $(call AddDepends/hwmon,+kmod-i2c-core +PACKAGE_kmod-thermal:kmod-thermal +kmod-regmap-i2c)
 endef
 
 define KernelPackage/hwmon-lm75/description
@@ -369,7 +369,7 @@ define KernelPackage/hwmon-tmp102
   KCONFIG:=CONFIG_SENSORS_TMP102
   FILES:=$(LINUX_DIR)/drivers/hwmon/tmp102.ko
   AUTOLOAD:=$(call AutoProbe,tmp102)
-  $(call AddDepends/hwmon,+kmod-i2c-core +PACKAGE_kmod-thermal:kmod-thermal +kmod-regmap)
+  $(call AddDepends/hwmon,+kmod-i2c-core +PACKAGE_kmod-thermal:kmod-thermal +kmod-regmap-i2c)
 endef
 
 define KernelPackage/hwmon-tmp102/description
@@ -384,7 +384,7 @@ define KernelPackage/hwmon-tmp103
   KCONFIG:=CONFIG_SENSORS_TMP103
   FILES:=$(LINUX_DIR)/drivers/hwmon/tmp103.ko
   AUTOLOAD:=$(call AutoProbe,tmp103)
-  $(call AddDepends/hwmon,+kmod-i2c-core +kmod-regmap)
+  $(call AddDepends/hwmon,+kmod-i2c-core +kmod-regmap-i2c)
 endef
 
 define KernelPackage/hwmon-tmp103/description
diff --git a/package/kernel/linux/modules/iio.mk b/package/kernel/linux/modules/iio.mk
index ee82eee71e8..fe682b31009 100644
--- a/package/kernel/linux/modules/iio.mk
+++ b/package/kernel/linux/modules/iio.mk
@@ -54,7 +54,7 @@ $(eval $(call KernelPackage,iio-ad799x))
 
 define KernelPackage/iio-hmc5843
   SUBMENU:=$(IIO_MENU)
-  DEPENDS:=+kmod-i2c-core +kmod-iio-core +kmod-regmap
+  DEPENDS:=+kmod-i2c-core +kmod-iio-core +kmod-regmap-i2c
   TITLE:=Honeywell HMC58x3 Magnetometer
   KCONFIG:= CONFIG_SENSORS_HMC5843_I2C
   FILES:= \
@@ -132,7 +132,7 @@ $(eval $(call KernelPackage,iio-dht11))
 define KernelPackage/iio-bmp280
   SUBMENU:=$(IIO_MENU)
   TITLE:=BMP180/BMP280/BME280 pressure/temperatur sensor
-  DEPENDS:=@!LINUX_3_18 +kmod-iio-core +kmod-regmap
+  DEPENDS:=@!LINUX_3_18 +kmod-iio-core +kmod-regmap-core
   KCONFIG:=CONFIG_BMP280
   FILES:=$(LINUX_DIR)/drivers/iio/pressure/bmp280.ko
 endef
@@ -149,7 +149,7 @@ $(eval $(call KernelPackage,iio-bmp280))
 define KernelPackage/iio-bmp280-i2c
   SUBMENU:=$(IIO_MENU)
   TITLE:=BMP180/BMP280/BME280 pressure/temperatur sensor (I2C)
-  DEPENDS:=+kmod-iio-bmp280 +kmod-i2c-core
+  DEPENDS:=+kmod-iio-bmp280 +kmod-i2c-core +kmod-regmap-i2c
   KCONFIG:=CONFIG_BMP280_I2C
   FILES:=$(LINUX_DIR)/drivers/iio/pressure/bmp280-i2c.ko
   AUTOLOAD:=$(call AutoProbe,iio-bmp280-i2c)
diff --git a/package/kernel/linux/modules/other.mk b/package/kernel/linux/modules/other.mk
index cfb70553c3b..220452df9bf 100644
--- a/package/kernel/linux/modules/other.mk
+++ b/package/kernel/linux/modules/other.mk
@@ -30,7 +30,7 @@ $(eval $(call KernelPackage,6lowpan))
 define KernelPackage/bluetooth
   SUBMENU:=$(OTHER_MENU)
   TITLE:=Bluetooth support
-  DEPENDS:=@USB_SUPPORT +kmod-usb-core +kmod-crypto-hash +kmod-crypto-ecb +kmod-lib-crc16 +kmod-hid +!LINUX_3_18:kmod-crypto-cmac +!LINUX_3_18:kmod-regmap +!(LINUX_3_18||LINUX_4_9):kmod-crypto-ecdh
+  DEPENDS:=@USB_SUPPORT +kmod-usb-core +kmod-crypto-hash +kmod-crypto-ecb +kmod-lib-crc16 +kmod-hid +!LINUX_3_18:kmod-crypto-cmac +!LINUX_3_18:kmod-regmap-core +!(LINUX_3_18||LINUX_4_9):kmod-crypto-ecdh
   KCONFIG:= \
 	CONFIG_BT \
 	CONFIG_BT_BREDR=y \
@@ -172,7 +172,7 @@ define KernelPackage/eeprom-at24
   SUBMENU:=$(OTHER_MENU)
   TITLE:=EEPROM AT24 support
   KCONFIG:=CONFIG_EEPROM_AT24
-  DEPENDS:=+kmod-i2c-core +kmod-nvmem +LINUX_4_19:kmod-regmap
+  DEPENDS:=+kmod-i2c-core +kmod-nvmem +LINUX_4_19:kmod-regmap-i2c
   FILES:=$(LINUX_DIR)/drivers/misc/eeprom/at24.ko
   AUTOLOAD:=$(call AutoProbe,at24)
 endef
@@ -219,7 +219,7 @@ $(eval $(call KernelPackage,gpio-dev))
 define KernelPackage/gpio-mcp23s08
   SUBMENU:=$(OTHER_MENU)
   TITLE:=Microchip MCP23xxx I/O expander
-  DEPENDS:=@GPIO_SUPPORT +kmod-i2c-core +!(LINUX_3_18||LINUX_4_9):kmod-regmap
+  DEPENDS:=@GPIO_SUPPORT +kmod-i2c-core +!(LINUX_3_18||LINUX_4_9):kmod-regmap-i2c
   KCONFIG:= \
 	CONFIG_GPIO_MCP23S08 \
 	CONFIG_PINCTRL_MCP23S08
@@ -476,7 +476,7 @@ define KernelPackage/rtc-ds1307
   SUBMENU:=$(OTHER_MENU)
   TITLE:=Dallas/Maxim DS1307 (and compatible) RTC support
   DEFAULT:=m if ALL_KMODS && RTC_SUPPORT
-  DEPENDS:=+kmod-i2c-core +!(LINUX_3_18||LINUX_4_9):kmod-regmap +!(LINUX_3_18||LINUX_4_9):kmod-hwmon-core
+  DEPENDS:=+kmod-i2c-core +!(LINUX_3_18||LINUX_4_9):kmod-regmap-i2c +!(LINUX_3_18||LINUX_4_9):kmod-hwmon-core
   KCONFIG:=CONFIG_RTC_DRV_DS1307 \
 	CONFIG_RTC_CLASS=y
   FILES:=$(LINUX_DIR)/drivers/rtc/rtc-ds1307.ko
@@ -710,32 +710,71 @@ endef
 $(eval $(call KernelPackage,serial-8250-exar))
 
 
-define KernelPackage/regmap
+define KernelPackage/regmap-core
   SUBMENU:=$(OTHER_MENU)
   TITLE:=Generic register map support
-  DEPENDS:=+kmod-lib-lzo +kmod-i2c-core
-  KCONFIG:=CONFIG_REGMAP \
-	   CONFIG_REGMAP_MMIO \
-	   CONFIG_REGMAP_SPI \
-	   CONFIG_REGMAP_I2C \
-	   CONFIG_SPI=y
-  FILES:= \
-	$(LINUX_DIR)/drivers/base/regmap/regmap-i2c.ko \
-	$(LINUX_DIR)/drivers/base/regmap/regmap-mmio.ko \
-	$(if $(CONFIG_SPI),$(LINUX_DIR)/drivers/base/regmap/regmap-spi.ko)
-  AUTOLOAD:=$(call AutoLoad,21,regmap-core regmap-i2c regmap-mmio regmap-spi)
-  ifeq ($(strip $(CONFIG_EXTERNAL_KERNEL_TREE)),"")
-   ifeq ($(strip $(CONFIG_KERNEL_GIT_CLONE_URI)),"")
-    FILES += $(LINUX_DIR)/drivers/base/regmap/regmap-core.ko
-   endif
-  endif
+  HIDDEN:=1
+  KCONFIG:=CONFIG_REGMAP
+ifneq ($(wildcard $(LINUX_DIR)/drivers/base/regmap/regmap-core.ko),)
+  FILES:=$(LINUX_DIR)/drivers/base/regmap/regmap-core.ko
+endif
 endef
 
-define KernelPackage/regmap/description
+define KernelPackage/regmap-core/description
  Generic register map support
 endef
 
-$(eval $(call KernelPackage,regmap))
+$(eval $(call KernelPackage,regmap-core))
+
+
+define KernelPackage/regmap-spi
+  SUBMENU:=$(OTHER_MENU)
+  TITLE:=SPI register map support
+  DEPENDS:=+kmod-regmap-core
+  HIDDEN:=1
+  KCONFIG:=CONFIG_REGMAP_SPI \
+	   CONFIG_SPI=y
+  FILES:=$(LINUX_DIR)/drivers/base/regmap/regmap-spi.ko
+endef
+
+define KernelPackage/regmap-spi/description
+ SPI register map support
+endef
+
+$(eval $(call KernelPackage,regmap-spi))
+
+
+define KernelPackage/regmap-i2c
+  SUBMENU:=$(OTHER_MENU)
+  TITLE:=I2C register map support
+  DEPENDS:=+kmod-regmap-core +kmod-i2c-core
+  HIDDEN:=1
+  KCONFIG:=CONFIG_REGMAP_I2C
+  FILES:=$(LINUX_DIR)/drivers/base/regmap/regmap-i2c.ko
+endef
+
+define KernelPackage/regmap-i2c/description
+ I2C register map support
+endef
+
+$(eval $(call KernelPackage,regmap-i2c))
+
+
+define KernelPackage/regmap-mmio
+  SUBMENU:=$(OTHER_MENU)
+  TITLE:=MMIO register map support
+  DEPENDS:=+kmod-regmap-core
+  HIDDEN:=1
+  KCONFIG:=CONFIG_REGMAP_MMIO
+  FILES:=$(LINUX_DIR)/drivers/base/regmap/regmap-mmio.ko
+endef
+
+define KernelPackage/regmap-mmio/description
+ MMIO register map support
+endef
+
+$(eval $(call KernelPackage,regmap-mmio))
+
 
 define KernelPackage/ikconfig
   SUBMENU:=$(OTHER_MENU)
@@ -996,7 +1035,7 @@ $(eval $(call KernelPackage,echo))
 define KernelPackage/bmp085
   SUBMENU:=$(OTHER_MENU)
   TITLE:=BMP085/BMP18x pressure sensor
-  DEPENDS:= +kmod-regmap @!LINUX_3_18
+  DEPENDS:= +kmod-regmap-core @!LINUX_3_18
   KCONFIG:= CONFIG_BMP085
   FILES:= $(LINUX_DIR)/drivers/misc/bmp085.ko
 endef
diff --git a/package/kernel/linux/modules/sound.mk b/package/kernel/linux/modules/sound.mk
index 177140e0fc1..bf4bd5d7c08 100644
--- a/package/kernel/linux/modules/sound.mk
+++ b/package/kernel/linux/modules/sound.mk
@@ -188,7 +188,7 @@ $(eval $(call KernelPackage,sound-via82xx))
 
 define KernelPackage/sound-soc-core
   TITLE:=SoC sound support
-  DEPENDS:=+kmod-regmap +kmod-ac97
+  DEPENDS:=+kmod-regmap-core +kmod-ac97
   KCONFIG:= \
 	CONFIG_SND_SOC \
 	CONFIG_SND_SOC_DMAENGINE_PCM=y \
@@ -321,7 +321,7 @@ define KernelPackage/sound-hda-core
 	$(LINUX_DIR)/sound/pci/hda/snd-hda-codec.ko \
 	$(LINUX_DIR)/sound/pci/hda/snd-hda-codec-generic.ko
   AUTOLOAD:=$(call AutoProbe,snd-hda-core@ge4.1 snd-hda-codec snd-hda-codec-generic)
-  $(call AddDepends/sound,+kmod-regmap)
+  $(call AddDepends/sound,+kmod-regmap-core)
 endef
 
 define KernelPackage/sound-hda-core/description
diff --git a/package/kernel/linux/modules/wpan.mk b/package/kernel/linux/modules/wpan.mk
index 199044fc334..d8d58fa0bc2 100644
--- a/package/kernel/linux/modules/wpan.mk
+++ b/package/kernel/linux/modules/wpan.mk
@@ -72,7 +72,7 @@ $(eval $(call KernelPackage,fakelb))
 define KernelPackage/at86rf230
   SUBMENU:=$(WPAN_MENU)
   TITLE:=AT86RF230 transceiver driver
-  DEPENDS:=+kmod-mac802154 +kmod-regmap
+  DEPENDS:=+kmod-mac802154 +kmod-regmap-spi
   KCONFIG:=CONFIG_IEEE802154_AT86RF230 \
 	CONFIG_IEEE802154_AT86RF230_DEBUGFS=n \
 	CONFIG_SPI=y \
@@ -85,7 +85,7 @@ $(eval $(call KernelPackage,at86rf230))
 define KernelPackage/mrf24j40
   SUBMENU:=$(WPAN_MENU)
   TITLE:=MRF24J40 transceiver driver
-  DEPENDS:=+kmod-mac802154 +kmod-regmap
+  DEPENDS:=+kmod-mac802154 +kmod-regmap-spi
   KCONFIG:=CONFIG_IEEE802154_MRF24J40 \
 	CONFIG_SPI=y \
 	CONFIG_SPI_MASTER=y