linux-kernel - Re: [PATCH V3 2/4] ARM64 LPC: LPC driver implementation on Hip06

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Message-ID: <3bab676a-2b65-8f27-d414-9cacc055094e@huawei.com>
Date:   Thu, 6 Oct 2016 14:31:52 +0100
From:   John Garry <john.garry@...wei.com>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Jon Masters <jcm@...masters.org>,
        Arnd Bergmann <arnd@...db.de>,
        <linux-arm-kernel@...ts.infradead.org>
CC:     "zhichang.yuan" <yuanzhichang@...ilicon.com>,
        <devicetree@...r.kernel.org>, <lorenzo.pieralisi@....com>,
        <gabriele.paoloni@...wei.com>, <minyard@....org>,
        <gregkh@...uxfoundation.org>, <will.deacon@....com>,
        <linux-kernel@...r.kernel.org>, <xuwei5@...ilicon.com>,
        <linuxarm@...wei.com>, <linux-serial@...r.kernel.org>,
        <linux-pci@...r.kernel.org>, <zourongrong@...il.com>,
        <liviu.dudau@....com>, <kantyzc@....com>,
        <zhichang.yuan02@...il.com>
Subject: Re: [PATCH V3 2/4] ARM64 LPC: LPC driver implementation on Hip06

On 06/10/2016 01:18, Benjamin Herrenschmidt wrote:
> On Tue, 2016-10-04 at 13:02 +0100, John Garry wrote:
>> Right, so I think Zhichang can make the necessary generic changes to
>> 8250 OF driver to support IO port as well as MMIO-based.
>>
>> However an LPC-based earlycon driver is still required.
>>
>> A note on hip07-based D05 (for those unaware): this does not use
>> LPC-based uart. It uses PL011. The hardware guys have managed some
>> trickery where they loopback the serial line around the BMC/CPLD. But we
>> still need it for hip06 D03 and any other boards which want to use LPC
>> bus for uart.
>>
>> A question on SBSA: does it propose how to provide serial via BMC for SOL?
>
> Probably another reason to keep 8250 as a legal option ... The (very
> popular) Aspeed BMCs tend to do this via a 8250-looking virtual UART on
> LPC.
>
> Cheers,
> Ben,

I think we're talking about the same thing for our LPC-based UART.

John

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