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Subject: Re: [PATCH v10 3/4] ARM64: ACPI: enable ACPI_SPCR_TABLE
To: Will Deacon <will.deacon@arm.com>,
        Aleksey Makarov <amakarov.linux@gmail.com>
References: <20160905123617.18775-1-aleksey.makarov@linaro.org>
 <20160905123617.18775-4-aleksey.makarov@linaro.org>
 <7e5486cc-4080-2d1e-8f6d-98874379887d@gmail.com>
 <20160908111654.GH1493@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>,
        Aleksey Makarov <aleksey.makarov@linaro.org>,
        "Rafael J . Wysocki" <rjw@rjwysocki.net>,
        "Zheng, Lv" <lv.zheng@intel.com>,
        Kefeng Wang <wangkefeng.wang@huawei.com>,
        Russell King <linux@arm.linux.org.uk>,
        Peter Hurley <peter@hurleysoftware.com>,
        Graeme Gregory <graeme.gregory@linaro.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Andy Shevchenko <andy.shevchenko@gmail.com>,
        linux-kernel@vger.kernel.org, Leif Lindholm <leif.lindholm@linaro.org>,
        linux-acpi@vger.kernel.org, Yury Norov <ynorov@caviumnetworks.com>,
        Christopher Covington <cov@codeaurora.org>,
        linux-serial@vger.kernel.org, Mark Salter <msalter@redhat.com>,
        Al Stone <ahs3@redhat.com>, linux-arm-kernel@lists.infradead.org,
        Len Brown <lenb@kernel.org>
From: Hanjun Guo <hanjun.guo@linaro.org>
Message-ID: <b1064bed-3823-392d-e4c1-cf82f06712ff@linaro.org>
Date: Thu, 8 Sep 2016 21:35:27 +0800
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On 2016/9/8 19:16, Will Deacon wrote:
> On Wed, Sep 07, 2016 at 12:30:19PM +0300, Aleksey Makarov wrote:
>>
>> On 09/05/2016 03:36 PM, Aleksey Makarov wrote:
>>> SBBR mentions SPCR as a mandatory ACPI table.  So enable it for ARM64
>>>
>>> Earlycon should be set up as early as possible.  ACPI boot tables are
>>> mapped in arch/arm64/kernel/acpi.c:acpi_boot_table_init() that
>>> is called from setup_arch() and that's where we parse SPCR.
>>> So it has to be opted-in per-arch.
>>>
>>> When ACPI_SPCR_TABLE is defined initialization of DT earlycon is
>>> deferred until the DT/ACPI decision is done.  Initialize DT earlycon
>>> if ACPI is disabled.
>>
>> Hi Will, Catalin,
>>
>> Can you review this patch and consider ACKing it please?
>
> Hanjun, Al, Mark, Graeme -- any comments on this?

We tested this patch on D02, although d02 is 8250 based
uart, but this patch is the core part, which makes sense
to me,

Acked-by: Hanjun Guo <hanjun.guo@linaro.org>

Thanks
Hanjun