From mboxrd@z Thu Jan 1 00:00:00 1970 From: John Garry Subject: Re: [PATCH V3 2/4] ARM64 LPC: LPC driver implementation on Hip06 Date: Thu, 6 Oct 2016 14:31:52 +0100 Message-ID: <3bab676a-2b65-8f27-d414-9cacc055094e@huawei.com> References: <1473855354-150093-1-git-send-email-yuanzhichang@hisilicon.com> <5140357.dcW9ibtZJ6@wuerfel> <57D963C4.4010406@hisilicon.com> <5869118.UilSPY9Sai@wuerfel> <2af4f2d8-e3a4-fa00-e700-60af70bf4560@jonmasters.org> <6bbfeb57-7a55-6a3e-60b2-3f44525e5882@huawei.com> <1475713112.3784.183.camel@kernel.crashing.org> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8"; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1475713112.3784.183.camel@kernel.crashing.org> Sender: linux-pci-owner@vger.kernel.org To: Benjamin Herrenschmidt , Jon Masters , Arnd Bergmann , linux-arm-kernel@lists.infradead.org Cc: "zhichang.yuan" , devicetree@vger.kernel.org, lorenzo.pieralisi@arm.com, gabriele.paoloni@huawei.com, minyard@acm.org, gregkh@linuxfoundation.org, will.deacon@arm.com, linux-kernel@vger.kernel.org, xuwei5@hisilicon.com, linuxarm@huawei.com, linux-serial@vger.kernel.org, linux-pci@vger.kernel.org, zourongrong@gmail.com, liviu.dudau@arm.com, kantyzc@163.com, zhichang.yuan02@gmail.com List-Id: devicetree@vger.kernel.org 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 > > > . >