linux-kernel - Re: [PATCH] irqchip: plic: Fix priority base offset

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Date:   Fri, 22 Mar 2019 06:27:48 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Alistair Francis <alistair23@...il.com>
Cc:     Christoph Hellwig <hch@...radead.org>,
        Alistair Francis <Alistair.Francis@....com>,
        "palmer@...ive.com" <palmer@...ive.com>,
        "linux-riscv@...ts.infradead.org" <linux-riscv@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] irqchip: plic: Fix priority base offset

On Wed, Mar 20, 2019 at 05:04:58PM -0700, Alistair Francis wrote:
> > Well, it starts at 0x00, but the first one is reserved.  If you think
> > that is too confusing I'd rather throw in a comment explaining this
> > fact rather than making the calculating more complicated.
> 
> It doesn't mention that it starts at 0 when you look here:
> https://sifive.cdn.prismic.io/sifive%2F834354f0-08e6-423c-bf1f-0cb58ef14061_fu540-c000-v1.0.pdf

It doesn't say that.  But it is completely obvious from the map,
and from how everything else works.  In this case I think the
documentation is simply written in a confusing way, and we need to fix
it once we have an official riscv spec level documentation of this
hardware.