Rattler 8347 and USB 2.0

[Li Yang-r58472]

> -----Original Message-----
> From: 
> linuxppc-embedded-bounces+leoli=freescale.com at ozlabs.org 
> [mailto:linuxppc-embedded-bounces+leoli=freescale.com at ozlabs.o
> rg] On Behalf Of Jamie Guinan
> Sent: Friday, September 01, 2006 12:14 AM
> To: linuxppc-embedded at ozlabs.org
> Subject: Rattler 8347 and USB 2.0
> 
> 
> Greetings,
> 
> I have an mpc8347 board here (A&M Rattler 8347).  It shipped with a
> 2.6.16 patched enough to boot the board, but support for 
> freescale USB 2.0 (ehci) is not present.
> 
> Working my way backwards in the mainline kernel tree 
> (2.6.18-rc5), I found drivers/usb/host/ehci-fsl.c, for 
> FreeScale/PPC EHCI support.
> 
> In that module, usb_hcd_fsl_probe() requires an initialized 
> "struct fsl_usb2_platform_data", which only appears in 
> arch/powerpc/sysdev/fsl_soc.c, yet the 2.6.16 patch provided 
> puts the board in arch/ppc.
> 
> My question is, what would be the best way to go about 
> getting ehci-fsl.c working with this board?
> 
> 1) Nudge the Rattler port from arch/ppc to arch/powerpc.  One 
> problem with this is that the rattler uses RedBoot, and reading this,
> 
> http://ozlabs.org/pipermail/linuxppc-embedded/2006-August/024116.html
> 
> it looks like arch/powerpc wants to boot from 
> OpenFirmware-like "flattened device tree" (does RedBoot 
> support this?).

Use a shim which directly builds FDT in kernel to use powerpc arch.
> 
> 2) Support ehci-fsl.c from arch/ppc.  If arch/ppc is 
> deprecated, that's a bad long-term solution.  And since 
> fsl_soc.c lives under arch/powerpc, that doesn't look good either.

Actually you don't need fsl_soc.c in ppc arch.  There are predefined
platform_device and platform_data in arch/ppc/syslib/mpc83xx_devices.c.
You can add your usb platform_data there easily.