[U-Boot] IMX6 DM_USB / DM_MMC requires OF_CONTROL?

[Lukasz Majewski <lukma@denx.de>]

Hi Tim,

> On Thu, Feb 21, 2019 at 6:48 AM Marcel Ziswiler
> <marcel.ziswiler@toradex.com> wrote:
> >
> > Hi Fabio
> >
> > On Tue, 2019-02-19 at 19:32 +0100, Stefano Babic wrote:  
> > > Hi Tim,
> > >
> > > On 19/02/19 19:24, Tim Harvey wrote:  
> > > > Greetings,
> > > >
> > > > I'm seeing that I need to switch my IMX6 board support
> > > > (board/gateworks/gw_ventana) over to DM_USB and DM_MMC right
> > > > away (v2019.04) and I notice enabling those fails building as
> > > > it looks like
> > > > these DM drivers expect OF_CONTROL (U-Boot running from a
> > > > device-tree).
> > > > Is that currently true or am I perhaps missing
> > > > something?  
> > >
> > > You are completely correct : moving to DM requires to set a DT for
> > > the
> > > board.  
> >
> > I don't think that is fully true. There is also the option of using
> > platform data. At least for certain parts of DM that is certainly
> > working (e.g. have a look at colibri_pxa270).
> >  
> 
> Marcel,
> 
> Good point, and IMX boards have used this already as for DM_SERIAL.
> However I don't see this possible yet for IMX (fsl_esdhc.c) DM_MMC...
> one would need to export a platdata struct to
> include/dm/platform_data. I'll have to look into that... I'm sure
> there are many other IMX boards out there that also need to get this
> done and perhaps are not ready to go to OF_CONTROL yet. I did take a
> quick stab at converting my board(s) to OF_CONTROL using
> SPL_MULTI_DTB_FIT and while I'm still not booting the SPL is way too
> large to fit within an IMX6DL cache.

Please look into my recent work for IMX6Q mccmon6 u-boot proper DM/DTS
conversion.

I've also converted the tpc70 board (including SPL).

> 
> Thanks,
> 
> Tim
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Best regards,

Lukasz Majewski

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