[U-Boot] is it mandatory for SPL to support DM

[Tom Rini]

On Mon, May 25, 2020 at 10:58:12PM +0530, Jagan Teki wrote:
> On Mon, May 25, 2020 at 9:06 PM Simon Glass <sjg at chromium.org> wrote:
> >
> > Hi,
> >
> > On Mon, 25 May 2020 at 04:35, Marek Vasut <marex at denx.de> wrote:
> > >
> > > On 5/25/20 10:44 AM, Jagan Teki wrote:
> > > > SPL has a foot-print constraint, so fully switching a particular
> > > > subsystem like SPI or SPI Flash to DM would increase the size of it.
> > > >
> > > > Possible areas to look at are (assume SPL_DM supported)
> > > > 1) platdata
> > > > 2) implement board or platform specific spl device driver which
> > > > bypassed the actual framework ex: spl_spi_sunxi.c
> > > >
> > > > Do we have any other solutions? or any arguments on above step 2?
> > >
> > > SPL does not need to support DM until the size problem is solved.
> >
> > I don't think the problem will ever be 'solved'. It is an ongoing battle.
> >
> > But as it happens I've just sent a proposal for tiny-dm that I think will help.
> >
> > Jagan, which board are you trying to convert? If you are trying to
> > convert SPI flash, I think we need to remove the legacy code first.
> 
> These are the partially dm converted drivers, so boards which are
> using can eventually need a dm spi switch.
> 
>         drivers/spi/fsl_dspi.c
>         drivers/spi/kirkwood_spi.c
>         drivers/spi/mxc_spi.c
>         drivers/spi/mxs_spi.c
>         drivers/spi/omap3_spi.c
>         drivers/spi/sh_qspi.c
> 
> I'm looking for proper options along with removal of some legacy code,
> and tiny-dm.

For the number of about to be year past published deadline (which has
been extended at times to get to that point even) boards, I think we
need to start by dropping boards.  Then we can see what makes sense
moving forward.

-- 
Tom
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