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    SubjectRe: [PATCH V2 4/4] ARM64 LPC: support earlycon for UART connected to LPC
    Date
    On Wednesday, September 14, 2016 7:26:22 PM CEST zhichang wrote:
    >
    > >
    > >> Hip06 LPC uart need two base addresses for earlycon.
    > >> 2. the IO type is mmio to introduce a memory base address to access LPC register file. But the real uart
    > >> IO type is UPIO_PORT. This is spcial...
    > >
    > > This sounds like a deficiency in the of_setup_earlycon() function,
    > > which can only handle MMIO addresses, and won't actually
    > > be able to understand nodes without a "ranges" property like
    > > you have here.
    > >
    > Yes.
    > The current of_setup_earlycon only support MMIO and the first reg property must be memory.
    >
    > We can not support our LPC uart without any new code.
    > But we can implement a private earlycon setup function and register
    > it to the __earlycon_table, things will be ok.

    I still think you should adapt of_setup_earlycon instead to handle IORESOURCE_IO
    registers.

    Arnd

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