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Re: [PATCH V2 4/4] ARM64 LPC: support earlycon for UART connected to LPC

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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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Re: [PATCH V2 4/4] ARM64 LPC: support earlycon for UART connected to  LPC zhichang <zhichang.yuan02@gmail.com> - 2016-09-14 13:30 +0200
  Re: [PATCH V2 4/4] ARM64 LPC: support earlycon for UART connected to LPC Arnd Bergmann <arnd@arndb.de> - 2016-09-14 14:40 +0200

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