[U-Boot] Porting ehci-exynos.c to handle exynos4412 (odroid-u2)

[Lukasz Majewski <l.majewski@samsung.com>]

On Sun, 07 Jul 2013 02:15:17 -0700, Suriyan Ramasami wrote:

Hi Suriyan,

> Hi wonderful folks!
> 
>     I own an odroid-u2 and the u-boot that comes with it does not
> have usb support. Its configuration is smdk4412 and I do not find
> that in the u-boot sources. I see it in the arndale and harkernel
> branches.
> 
>    I do see that usb support was added to the arndale platform -
> which is exynos5 based. Is it easy to port it for exynos4412?

Patches for Exynos4412 based board (TRATS2) were already sent on the
mailing list:

http://thread.gmane.org/gmane.comp.boot-loaders.u-boot/161578/match=introduce+samsung's+new+board+trats2

Please refer to them. It shall be relatively easy to add odroid-u2
support based on TRATS2.

> 
>    I did try it porting on my own accord and am listing it below...
> 
>    I seem to be hitting issues in drivers/usb/host/ehci-exynos.c ->
> function setup_usb_phy(struct exynos_usb_phy *usb).
> Would passing the correct address of usb for the exynos4412 do the
> trick? If so what should it be?
>   In this same file ehci_hcd_init() uses gpio->x3 and gpio->d1. In
> exynos4 looks like x3 is from gpio_part2. Also, do the d1 and x3
> translate to the same gpiod1 and gpiox3 in the exynos4412?
> 
> Furthermore, ehci-exynos.c uses functions from
> arch/arm/cpu/armv7/exynos/system.c which for the most part  are
> exynos5 oriented and do nothing for exynos4.
> 
> Can someone guide me as to what I could do, or some pointers to
> helpful docs? I do have the Exynos 4412 user manual.
> 
> Thanks
> - Suriyan


-- 
Best regards,

Lukasz Majewski

Samsung R&D Institute Poland (SRPOL) | Linux Platform Group