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Date: Fri, 12 Sep 2014 15:48:23 -0400
From: Jon Masters <jcm@redhat.com>
Organization: Red Hat, Inc.
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To: Hanjun Guo <hanjun.guo@linaro.org>,
        Catalin Marinas <catalin.marinas@arm.com>,
        "Rafael J. Wysocki" <rjw@rjwysocki.net>,
        Mark Rutland <mark.rutland@arm.com>, Olof Johansson <olof@lixom.net>,
        Grant Likely <grant.likely@linaro.org>,
        Will Deacon <will.deacon@arm.com>
CC: Graeme Gregory <graeme.gregory@linaro.org>, Arnd Bergmann <arnd@arndb.de>,
        Sudeep Holla <Sudeep.Holla@arm.com>,
        Jason Cooper <jason@lakedaemon.net>,
        Marc Zyngier <marc.zyngier@arm.com>,
        Bjorn Helgaas <bhelgaas@google.com>,
        Daniel Lezcano <daniel.lezcano@linaro.org>,
        Mark Brown <broonie@kernel.org>, Rob Herring <robh@kernel.org>,
        Robert Richter <rric@kernel.org>, Lv Zheng <lv.zheng@intel.com>,
        Robert Moore <robert.moore@intel.com>,
        Lorenzo Pieralisi <Lorenzo.Pieralisi@arm.com>,
        Liviu Dudau <Liviu.Dudau@arm.com>,
        Randy Dunlap <rdunlap@infradead.org>, Charles.Garcia-Tobin@arm.com,
        linux-acpi@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        linux-kernel@vger.kernel.org, linaro-acpi@lists.linaro.org,
        Tomasz Nowicki <tomasz.nowicki@linaro.org>
Subject: Re: [PATCH v4 14/18] ARM64 / ACPI: Add GICv2 specific ACPI boot support
References: <1410530416-30200-1-git-send-email-hanjun.guo@linaro.org> <1410530416-30200-15-git-send-email-hanjun.guo@linaro.org>
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On 09/12/2014 10:00 AM, Hanjun Guo wrote:
> From: Tomasz Nowicki <tomasz.nowicki@linaro.org>
> 
> ACPI kernel uses MADT table for proper GIC initialization. It needs to
> parse GIC related subtables, collect CPU interface and distributor
> addresses and call driver initialization function (which is hardware
> abstraction agnostic). In a similar way, FDT initialize GICv1/2.
> 
> NOTE: This commit allow to initialize GICv1/2 basic functionality.
> GICv2 vitalization extension, GICv3/4 and ITS are considered as next
> steps.

Aside: A request to specifically update the flags in ACPI to indicate
GICv3/v4 systems has been filed for a future spec revision.

Jon.