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

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Date:   Thu, 8 Sep 2016 17:51:25 +0800
From:   zhichang <zhichang.yuan02@...il.com>
To:     Arnd Bergmann <arnd@...db.de>, linux-arm-kernel@...ts.infradead.org
Cc:     Zhichang Yuan <yuanzhichang@...ilicon.com>, linuxarm@...wei.com,
        linux-kernel@...r.kernel.org, lorenzo.pieralisi@....com,
        minyard@....org, benh@...nel.crashing.org,
        gabriele.paoloni@...wei.com, john.garry@...wei.com,
        liviu.dudau@....com, zourongrong@...il.com
Subject: Re: [PATCH V2 3/4] ARM64 LPC: support serial based on low-pin-count

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@...ilicon.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@...ilicon.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
>