da850.dtsi Naming convention Question

[Sekhar Nori]

Hi Adam,

On Tuesday 12 September 2017 07:13 PM, Adam Ford wrote:
> I am confused by the naming convention of the da850.dtsi file, and I
> am hoping someone can clarify how this works.
> 
> Specifically, is defined int he device tree as "gpio: gpio at 226000"
> 
> Other TI boards (like omap3.dtsi) use a convention with the address
> after the @ symbol.
> 
> (in omap3.dtsi, the gpio bank1 is configured as gpio1: gpio at 48310000
> where 48310000 is the address of the register)
> 
> An attempt was made to correct this in:
> 
> c2a3b4bca53a ("ARM: dts: davinci: use proper address after @")  where
> an fix was made to make gpio: gpio at 1e26000  which would match the
> address in the TRM.  Unfortunately, it looks as if it was undone
> almost right away.

I think you are reading that commit in reverse. The fix was to make the
unit address match the reg property (make it gpio at 226000)

> 
> My question is this:  Where did the 226000 number originate, and why
> would we not want to use the actual address of the 1e26000 as defined
> in the Techincal Reference manual?

Because we define these nodes as being under the "soc" node at offset
1c00000.

Thanks,
Sekhar