[PATCH V2 3/4] ARM64 LPC: support serial based on low-pin-count

zhichang zhichang.yuan02 at gmail.com
Thu Sep 8 02:51:25 PDT 2016

Hi, Arnd

On 2016年09月07日 22:50, Arnd Bergmann wrote:
> On Wednesday, September 7, 2016 9:33:52 PM CEST Zhichang Yuan wrote:
>> From: "zhichang.yuan" <yuanzhichang at hisilicon.com>
>> On Hip06 platform, a 16550 compatible UART is connected to low-pin-count and
>> controlled through the LPC I/O cycles. This patch drives the UART port with
>> the specific serial in/out function pair based on the indirect-IO mechanism
>> introduced by Hip06 LPC driver.
>> Signed-off-by: zhichang.yuan <yuanzhichang at hisilicon.com>
> Any reason this cannot just use the regular drivers/tty/serial/8250/8250_of.c
> driver?
I think two reasons for that:
1. 8250_of.c is only for devicetree, but we need to support ACPI device too;
2. It seems UPIO_PORT is not supported there.


> 	Arnd

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