linux-kernel - Re: [PATCHv2 3/3] Documentation: DT bindings: Tegra AHB: note base address change

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Date:	Thu, 19 Mar 2015 15:26:06 +0000 (UTC)
From:	Paul Walmsley <paul@...an.com>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
cc:	linux-tegra@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Mark Rutland <mark.rutland@....com>,
	Alexandre Courbot <gnurou@...il.com>,
	Pawel Moll <pawel.moll@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Stephen Warren <swarren@...dotorg.org>,
	linux-kernel@...r.kernel.org,
	Eduardo Valentin <edubezval@...il.com>,
	devicetree@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
	Thierry Reding <thierry.reding@...il.com>,
	Paul Walmsley <pwalmsley@...dia.com>,
	Kumar Gala <galak@...eaurora.org>,
	Hiroshi DOYU <hdoyu@...dia.com>
Subject: Re: [PATCHv2 3/3] Documentation: DT bindings: Tegra AHB: note base
 address change

On Tue, 17 Mar 2015, Russell King - ARM Linux wrote:

> On Tue, Mar 17, 2015 at 01:32:21AM -0700, Paul Walmsley wrote:
> >  Required properties:
> >  - compatible : For Tegra20, must contain "nvidia,tegra20-ahb".  For
> > -  Tegra30, must contain "nvidia,tegra30-ahb".  Otherwise, must contain
> > -  '"nvidia,<chip>-ahb", "nvidia,tegra30-ahb"' where <chip> is tegra124,
> > -  tegra132, or tegra210.
> > -- reg : Should contain 1 register ranges(address and length)
> > +  Tegra30, must contain "nvidia,tegra30-ahb".  For Tegra114 and Tegra124, must
> > +  contain '"nvidia,<chip>-ahb", "nvidia,tegra30-ahb"' where <chip> is tegra114
> > +  or tegra124.  For Tegra132, the compatible string must contain
> > +  "nvidia,tegra132-ahb".
> > +
> > +- reg : Should contain 1 register ranges(address and length).  On Tegra20,
> > +  Tegra30, Tegra114, and Tegra124 chips, the low byte of the physical base
> > +  address of the IP block must end in 0x04.  On DT files for later chips, the
> > +  actual hardware base address of the IP block should be used.
> 
> You could check that in the driver.  If you can check it in the driver,
> you can also decide to ignore it if it were offset by 0x04 (possibly
> printing a warning.)  That opens up the ability to fix the older Tegra
> DT files going forward while still remaining compatible with existing
> DT files, and avoiding the need for a complex note about this.

That's fine, I'll do that and drop this patch.

- Paul
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