linux-kernel - Re: [PATCH 3/4] irqchip/mbigen: add support for a MBIGEN generating SPIs

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Message-ID: <df892248-4f9c-c095-df9b-885f1e650ba0@huawei.com>
Date:   Thu, 18 Oct 2018 19:20:56 +0800
From:   Hanjun Guo <guohanjun@...wei.com>
To:     Marc Zyngier <marc.zyngier@....com>,
        Yang Yingliang <yangyingliang@...wei.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
CC:     <tglx@...utronix.de>
Subject: Re: [PATCH 3/4] irqchip/mbigen: add support for a MBIGEN generating
 SPIs

Hi Marc,

>>>>
>>> Now, the biggest question of them all: how does it work with ACPI? Last
>>> time I checked, there was no DT support for platforms using the MBIGEN.
>> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/arm64/boot/dts/hisilicon/hip07.dtsi
>> This DT describes how platform devices using the MBIGEN.
> 
> That's not how my own D05 boots. It is ACPI only. How is that going to
> work on this platform?

D05 is ACPI only so it has no dtb in the firmware, that's why we can
boot D05 without acpi=on in the boot cmdline, but if you want to
boot D05 with dtb, you could try to specify the dtb in the grub
(seems centos based):

menuentry "example" --id example{
        linux /Image-kernel root=... rdinit=...
        initrd /example.img
        devicetree /d05.dtb
}

Hope it helps.

Thanks
Hanjun