linux-kernel - Re: [RFC 3/5] powerpc/mpic: Add support for non-contiguous irq ranges

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Message-ID: <20180807180938.GA13623@rob-hp-laptop>
Date:   Tue, 7 Aug 2018 12:09:38 -0600
From:   Rob Herring <robh@...nel.org>
To:     Bharat Bhushan <Bharat.Bhushan@....com>
Cc:     benh@...nel.crashing.org, paulus@...ba.org, mpe@...erman.id.au,
        oss@...error.net, galak@...nel.crashing.org, mark.rutland@....com,
        kstewart@...uxfoundation.org, gregkh@...uxfoundation.org,
        devicetree@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org, keescook@...omium.org,
        tyreld@...ux.vnet.ibm.com, joe@...ches.com
Subject: Re: [RFC 3/5] powerpc/mpic: Add support for non-contiguous irq ranges

On Fri, Jul 27, 2018 at 03:17:59PM +0530, Bharat Bhushan wrote:
> Freescale MPIC h/w may not support all interrupt sources reported
> by hardware, "last-interrupt-source" or platform. On these platforms
> a misconfigured device tree that assigns one of the reserved
> interrupts leaves a non-functioning system without warning.

There are lots of ways to misconfigure DTs. I don't think this is 
special and needs a property. We've had some interrupt mask or valid 
properties in the past, but generally don't accept those.

> 
> This patch adds "supported-irq-ranges" property in device tree to
> provide the range of supported source of interrupts. If a reserved
> interrupt used then it will not be programming h/w, which it does
> currently, and through warning.
> 
> Signed-off-by: Bharat Bhushan <Bharat.Bhushan@....com>
> ---
>  .../devicetree/bindings/powerpc/fsl/mpic.txt       |   8 ++
>  arch/powerpc/include/asm/mpic.h                    |   9 ++
>  arch/powerpc/sysdev/mpic.c                         | 113 +++++++++++++++++++--
>  3 files changed, 121 insertions(+), 9 deletions(-)