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

[Paul Walmsley]

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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