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authorLevin Du <[email protected]>2018-07-31 13:59:22 +0800
committerHeiko Stuebner <[email protected]>2018-08-27 06:16:48 +0200
commit99165b93dafe4f2a821b5dae106f2ef6b4ceff7e (patch)
tree8408a86370515f95a18ebed7ddf7279cee4695dd /include/linux/fpga/fpga-bridge.h
parent692ff61efab62fde4ae43d611e9c0cdb060dacbd (diff)
arm64: dts: rockchip: add sdmmc UHS support for roc-rk3328-cc
In roc-rk3328-cc board, the signal voltage of sdmmc is supplied by the vcc_sdio regulator, which is a mux between 1.8V and 3.3V, controlled by a special output only gpio pin labeled "gpiomut_pmuio_iout", corresponding bit 1 of the syscon GRF_SOC_CON10. This special pin can now be reference as <&grf_gpio 0>, thanks to the gpio-syscon driver, which makes writing regulator-gpio possible. If the signal voltage changes, the io domain needs to change correspondingly. To use this feature, the following options are required in kernel config: - CONFIG_GPIO_SYSCON=y - CONFIG_POWER_AVS=y - CONFIG_ROCKCHIP_IODOMAIN=y Signed-off-by: Levin Du <[email protected]> Signed-off-by: Heiko Stuebner <[email protected]>
Diffstat (limited to 'include/linux/fpga/fpga-bridge.h')
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