rk3399_android7.1添加个驱动且加上宏控编译

第一步：在arch/arm64/configs/rockchip_defconfig添加对应的宏，且属性设置为y，即编译进内核，这里是CONFIG_AS2056_I2C：

+++ b/arch/arm64/configs/rockchip_defconfig
@@ -421,6 +421,7 @@ CONFIG_SERIAL_8250_DW=y
CONFIG_I2C_CHARDEV=y
CONFIG_I2C_GPIO=y
CONFIG_I2C_RK3X=y
+CONFIG_AS2056_I2C=y
CONFIG_SPI=y
CONFIG_SPI_ROCKCHIP=y

第二步：drivers/Kconfig添加对应source Kconfig

+++ b/drivers/Kconfig
@@ -206,4 +206,6 @@ source "drivers/rk_nand/Kconfig"

source "drivers/headset_observe/Kconfig"

+source "drivers/as2056/Kconfig"

第三步：drivers/Makefile添加对应的编译语句，加上宏CONFIG_AS2056_I2C:

+++ b/drivers/Makefile
@@ -178,3 +178,4 @@ obj-$(CONFIG_FPGA)          += fpga/
obj-$(CONFIG_TEE)              += tee/
obj-$(CONFIG_RK_NAND)          += rk_nand/
obj-$(CONFIG_RK_HEADSET)       += headset_observe/
+obj-$(CONFIG_AS2056_I2C)       += as2056/

第四部：对应驱动文件夹添加Kconfig和编译Makefile
Makefile文件内容：

caizd@ubt144c:/work/czd/rk3399_7.1_ind/kernel$ vi drivers/as2056/Makefile
obj-$(CONFIG_AS2056_I2C)        += as2056_ctrl.o

Kconfig文件内容：

config AS2056_I2C
tristate "As2056 USB adapter"
depends on USB && I2C
	help
	If you say yes to this option, support will be included for As2056
    a USB to I2C interface.

This driver can also be built as a module.

这样，如果要编译驱动as2056进内核，只需要在kernel先执行make ARCH=arm64 rockchip_defconfig即可配置编译。