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  • Sergei Shtylyov's avatar
    extcon: add Maxim MAX3355 driver · 08a0a4f9
    Sergei Shtylyov authored
    
    
    Maxim Integrated MAX3355E chip integrates a charge pump and comparators to
    enable a system with an integrated USB OTG dual-role transceiver to
    function as an USB OTG dual-role device. In addition to sensing/controlling
    Vbus, the chip also passes thru the ID signal from the USB OTG connector.
    On some Renesas boards, this signal is just fed into the SoC thru a GPIO
    pin -- there's no real OTG controller, only host and gadget USB controllers
    sharing the same USB bus; however, we'd like to allow host or gadget
    drivers to be loaded depending on the cable type, hence the need for the
    MAX3355 extcon driver. The Vbus status signals are also wired to GPIOs
    (however, we aren't currently interested in them), the OFFVBUS# signal is
    controlled by the host controllers, there's also the SHDN# signal wired to
    a GPIO, it should be driven high for the normal operation.
    
    Signed-off-by: default avatarSergei Shtylyov <sergei.shtylyov@cogentembedded.com>
    Acked-by: default avatarChanwoo Choi <cw00.choi@samsung.com>
    Acked-by: default avatarRob Herring <robh@kernel.org>
    [cw00.choi: Add the GPIOLIB dependency]
    Signed-off-by: default avatarChanwoo Choi <cw00.choi@samsung.com>
    08a0a4f9