Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755526AbcJFNdC (ORCPT ); Thu, 6 Oct 2016 09:33:02 -0400 Received: from szxga03-in.huawei.com ([119.145.14.66]:13234 "EHLO szxga03-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753924AbcJFNcx (ORCPT ); Thu, 6 Oct 2016 09:32:53 -0400 Subject: Re: [PATCH V3 2/4] ARM64 LPC: LPC driver implementation on Hip06 To: Benjamin Herrenschmidt , Jon Masters , Arnd Bergmann , 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> CC: "zhichang.yuan" , , , , , , , , , , , , , , , From: John Garry Message-ID: <3bab676a-2b65-8f27-d414-9cacc055094e@huawei.com> Date: Thu, 6 Oct 2016 14:31:52 +0100 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.3.0 MIME-Version: 1.0 In-Reply-To: <1475713112.3784.183.camel@kernel.crashing.org> Content-Type: text/plain; charset="utf-8"; format=flowed Content-Transfer-Encoding: 7bit X-Originating-IP: [10.203.181.162] X-CFilter-Loop: Reflected Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 948 Lines: 31 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 > > > . >