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Date: Mon, 17 Jun 2013 19:13:48 -0500
From: Scott Wood <scottwood@freescale.com>
Subject: Re: [PATCH 4/5] powerpc/dts: remove msi-available-ranges property
To: Lian Minghuan-b31939 <B31939@freescale.com>
References: <1371194159-17332-1-git-send-email-Minghuan.Lian@freescale.com>
 <1371194159-17332-4-git-send-email-Minghuan.Lian@freescale.com>
 <1371247853.2996.17@snotra> <51BE9B78.9080302@freescale.com>
In-Reply-To: <51BE9B78.9080302@freescale.com> (from B31939@freescale.com on
 Mon Jun 17 00:15:36 2013)
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Cc: Minghuan Lian <Minghuan.Lian@freescale.com>, linuxppc-dev@lists.ozlabs.org,
 Zang Roy-R61911 <r61911@freescale.com>
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On 06/17/2013 12:15:36 AM, Lian Minghuan-b31939 wrote:
> On 06/15/2013 06:10 AM, Scott Wood wrote:
>> On 06/14/2013 02:15:58 AM, Minghuan Lian wrote:
>>> For MPIC v4.3 MSIIR supports 8 MSI registers and MSIIR1 supports
>>> 16 MSI registers, but uses different IBS and SRS shift. For the
>>> first register, when using MSIIR we will get the irqs 0x0 0x1 0x2
>>> ...0x1f, but when using MSIIR1, the irqs are 0x0 0x10 0x20 ... 0x1f0
>>> It is hard to describe the available irqs using property
>>> 'msi-available-ranges'. The patch removes this property.
>>=20
>> Only remove it from mpic 4.3.  And since you introduced =20
>> qoriq-mpic4.3.dtsi earlier in the patchset, why didn't you just =20
>> avoid adding it then?
>>=20
> [Minghuan] If adding it in qoriq-mpic4.3, and the 3-5 patches are not =20
> accepted, mpic4.3 can also work.

mpic 4.3 cannot work with msi-available-ranges, at all.  The hardware =20
just doesn't work that way.

-Scott=