linux-kernel - Re: [Patch v7 6/7] irqchip: xilinx: Try to fall back if xlnx,kind-of-intr not provided

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Message-ID: <alpine.DEB.2.20.1611181426430.3615@nanos>
Date:   Fri, 18 Nov 2016 14:29:45 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Zubair Lutfullah Kakakhel <Zubair.Kakakhel@...tec.com>
cc:     monstr@...str.eu, jason@...edaemon.net, marc.zyngier@....com,
        linux-kernel@...r.kernel.org, michal.simek@...inx.com,
        linuxppc-dev@...ts.ozlabs.org, mpe@...erman.id.au
Subject: Re: [Patch v7 6/7] irqchip: xilinx: Try to fall back if xlnx,kind-of-intr
 not provided

On Mon, 14 Nov 2016, Zubair Lutfullah Kakakhel wrote:

> The powerpc dts file does not have the xlnx,kind-of-intr property.
> Instead of erroring out, give a warning instead. And attempt to
> continue to probe the interrupt controller while assuming
> kind-of-intr is 0x0 as a fall back.

This is broken, really. On multiplatform kernels this will try to probe the
chip no matter what.
 
Powerpc already has:

static const struct of_device_id xilinx_intc_match[] __initconst = {
       { .compatible = "xlnx,opb-intc-1.00.c", },
       { .compatible = "xlnx,xps-intc-1.00.a", },
       {}
};

Unless I'm missing something important, then adding those compatible
strings to the driver will just keep stuff working as expected instead of
adding unsafe and broken heuristics.

Thanks,

	tglx