Scott Wood wrote:
> On Thu, Mar 19, 2009 at 04:16:07PM +0100, Wolfgang Grandegger wrote:
>> +Optional properties:
>> +- fsl,upm-mar-offset : use the UPM machine address register to drive a
>> + custom chip select logic using the specified
>> + offset.
>
> Your example uses the name fsl,upm-mar-chip-offset instead.
I need to fix the documentation then.
>> +- chip-offset : address offset between chips for multi-chip support.
>
> How is this different from fsl,upm-mar-offset?
Well, after a closer look, it's the same, hardware-wise. The offset sets
the corresponding address lines, which are used to select the chip. As
it is currently, "chip-offset" is used for:
chip->IO_ADDR_R = chip->IO_ADDR_W =
fun->upm.io_addr + fun->chip_offset * chip_nr;
and "upm-mar-chip-offset" to set the address lines through the MAR
register when running the command or address patterns:
mar += fun->upm_mar_chip_offset * fun->chip_nr;
I'm going to remove "upm_mar_chip_offset" and use "chip_offset" instead,
also for the U-Boot version. Thanks for pointing that out.
Wolfgang.
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