linux-kernel - Re: [PATCH v3 4/7] of: configure the platform device dma parameters

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Message-ID: <CACRpkda5x-fJWTN40ze17woMWuWoVbuhbNu5nkm1sFcdJchRfA@mail.gmail.com>
Date:	Wed, 28 May 2014 15:32:56 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Grant Likely <grant.likely@...aro.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Santosh Shilimkar <santosh.shilimkar@...com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Grygorii Strashko <grygorii.strashko@...com>,
	Russell King <linux@....linux.org.uk>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Rob Herring <robh+dt@...nel.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Olof Johansson <olof@...om.net>
Subject: Re: [PATCH v3 4/7] of: configure the platform device dma parameters

On Wed, May 28, 2014 at 3:29 PM, Arnd Bergmann <arnd@...db.de> wrote:
> On Wednesday 28 May 2014 10:23:09 Linus Walleij wrote:

>>         model = "ARM Integrator/AP";
>>         compatible = "arm,integrator-ap";
>> +       dma-ranges = <0x80000000 0x8 0x00000000 0x80000000>;
>>
>>         aliases {
>>                 arm,timer-primary = &timer2;
>>
>
> It looks like you accidentally copied the ranges from keystone, even
> though that has a 64-bit root bus and you only have 32-bit.

Nah it was no accident, just good old incompetence ;-)

> I suspect what you want is
>
>         dma-ranges = <0x80000000 0 0x80000000>;
>
> to translate dma_addr_t 0x80000000-0xffffffff to phys_addr_t 0x0-0x7fffffff
> rather than phys_addr_t 0x800000000-0x87fffffff.

Thanks, I'll fix up my patch.

Yours,
Linus Walleij
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