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

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Message-ID: <1475713112.3784.183.camel@kernel.crashing.org>
Date:   Thu, 06 Oct 2016 11:18:32 +1100
From:   Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:     John Garry <john.garry@...wei.com>,
        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 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,