linux-kernel - Re: [RFC] irqchip: add support for LS1021A external interrupt lines

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Message-ID: <42019fb5-393a-08b0-924d-bf1a97e078fe@prevas.dk>
Date:   Mon, 11 Dec 2017 14:45:39 +0100
From:   Rasmus Villemoes <rasmus.villemoes@...vas.dk>
To:     Alexander Stein <alexander.stein@...tec-electronic.com>
CC:     Marc Zyngier <marc.zyngier@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>
Subject: Re: [RFC] irqchip: add support for LS1021A external interrupt lines

On 2017-12-11 11:02, Alexander Stein wrote:

> Oh, and what is the content of register SCFG_SCFGREVCR?

Good point. On my board it's 0xffffffff, set even before U-boot starts,
and lots board support code in U-boot expects this. I can't immediately
find examples in the linux source code that actually writes to the scfg,
so I don't know if we already have that as an implicit assumption as
well. But it would be kind of nasty to have to make the code read
SCFG_SCFGREVCR and decide the bit pattern to use based on that -
especially since I wouldn't be able to test it.

Who thought such a magic switch could ever be a good idea?

-- 
Rasmus Villemoes
Software Developer
Prevas A/S
Hedeager 3
DK-8200 Aarhus N
+45 51210274
rasmus.villemoes@...vas.dk
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