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

zhichang
2016-09-08T09:51:25Z

Hi, Arnd

On 2016?09?07? 22:50, Arnd Bergmann wrote:
> On Wednesday, September 7, 2016 9:33:52 PM CEST Zhichang Yuan wrote:
>> From: "zhichang.yuan" <yuanzhichang@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@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.

Best,
Zhichang

>
> Arnd
>