linux-kernel - Re: [RFC PATCH v3] irqchip: Add support for Tango interrupt controller

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Message-ID: <yw1xmvs0qkue.fsf@unicorn.mansr.com>
Date:	Wed, 20 Jan 2016 16:25:29 +0000
From:	Måns Rullgård <mans@...sr.com>
To:	Marc Zyngier <marc.zyngier@....com>
Cc:	Marc Gonzalez <marc_gonzalez@...madesigns.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jason Cooper <jason@...edaemon.net>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux ARM <linux-arm-kernel@...ts.infradead.org>,
	Sebastian Frias <sf84@...oste.net>
Subject: Re: [RFC PATCH v3] irqchip: Add support for Tango interrupt controller

Marc Zyngier <marc.zyngier@....com> writes:

> On 20/01/16 16:10, Måns Rullgård wrote:
>> Marc Zyngier <marc.zyngier@....com> writes:
>> 
>>>> +	if (of_property_read_u32(node, "reg", &ctl))
>>>> +		panic("%s: failed to get reg base", node->name);
>>>> +
>>>> +	chip = kzalloc(sizeof(*chip), GFP_KERNEL);
>>>> +	chip->ctl = ctl;
>>>> +	chip->base = base;
>> 
>> As I said before, this assumes the outer DT node uses a ranges
>> property.  Normally reg properties work the same whether they specify an
>> offset within an outer "ranges" or have a full address directly.  It
>> would be easy enough to make this work with either, so I don't see any
>> reason not to.
>
> Yup, that is a good point. I guess Marc can address this in the next
> round, since we need a DT binding anyway.

I'd suggest using of_address_to_resource() on both nodes and subtracting
the start addresses returned.

-- 
Måns Rullgård