Platform device style question
bwarren at qstreams.com
Fri Aug 25 04:43:12 EST 2006
On Thu, 2006-08-24 at 22:06 +0400, Vitaly Bordug wrote:
> I'd suggest to make a look at LDD concerning linux device model...
Thanks. I'll read it again. My little brain absorbs this stuff very
> For platform device, there's no need to cope with u-boot at all. You'll prolly need to
> register the respective platform device from the board-specific code, with proper name
> and driver's board-specific platform info. You may have a look at arch/ppc/syslib/ppc_sys.c about static
> PD definitions usage.
My particular platform (MPC8349) gets its hardware info (CPU, IMMBAR,
PCI, I2C, SPI resources etc.) from an OF device tree that is generated
alongside U-boot and I guess embedded in the uImage file. (I apologize
if I'm getting my jargon mixed up here) The OF device tree idea seemed
like a slick way to abstract away some HW settings from Linux. I was
imagining writing board-side platform device registration that gets its
settings from the device tree, allowing a bit of re-use between similar
but not identical boards.
> I'd make sense to figure out the platform device bus before digging into device trees. It's slightly
> different stuff, for similar aim, but anyway... Actually you do not strictly need devtree to cope with
> your case afaiu.
I definitely have much learning to do. Thanks very much for the
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