[PATCH] powerpc: Create "rom" (MTD) device prpmc2800
David Gibson
david at gibson.dropbear.id.au
Fri Jun 15 00:14:23 EDT 2007
On Thu, Jun 07, 2007 at 05:55:44PM +0200, Segher Boessenkool wrote:
> > Any representation of flash devices in the device-tree should ideally
> > have 'bus width' and 'interleave' properties to contain this
> > information.
> >
> > The 'bus width' cannot necessarily be inferred, especially where a
> > given
> > bus can be configured to allow multiple sizes of access. It's purely a
> > function of how the flash chips are wired up. That's why we actually
> > call it 'bank width', not 'bus width' in the Linux code.
>
> Ah, "bank width" as in "bus width" per chip select. I see.
>
> So I think the best thing to have would be
>
> compatible "cfi-flash"
> bank-width like you said
> device-width width of a single flash device
> reg complete address range of this thing
>
> and then the Linux OF CFI flash code / MTD code just keeps
> on probing devices from that address range until it has it
> filled.
>
> Sounds good / comments / anything I missed?
Slight revision suggestion. Can we make 'device-width' optional, with
the default value being equal to the bank-width?
--
David Gibson | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_
| _way_ _around_!
http://www.ozlabs.org/~dgibson
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