Re: [PATCH] Add Linux dts files and use them
Alexander Shiyan
shc_work at mail.ru
Mon May 5 11:01:24 PDT 2014
Mon, 5 May 2014 19:48:16 +0200 от Sascha Hauer <s.hauer at pengutronix.de>:
> On Mon, May 05, 2014 at 07:57:48PM +0400, Alexander Shiyan wrote:
> > Mon, 5 May 2014 10:20:49 +0200 от Sascha Hauer <s.hauer at pengutronix.de>:
> > > Some updates how I intend to handle upstream dts changes in barebox.
> > >
> > > - I will merge the latest upstream dts changes to barebox for each Linux
> > > rc. Should dts changes introduce regressions this will at least give us
> > > the Linux rc which introduced it
> > > - I will always merge dts updates to barebox next, not to master. While
> > > dts changes may be needed in master to fix regressions on one board,
> > > they could also introduce new regressions on other boards. Should we
> > > need dts changes to fix regressions in barebox master, we have to do
> > > it using overlays in arch/*/dts/ until an upstream fix arrives in dts/
> > > - I will not send the dts updates to the list, I'll just merge them to
> > > barebox next some time after a new Linux rc arrived (As just happened
> > > with 3.15-rc3)
> >
> > Just to understand our further concept:
> >
> > (I will use the example based on i.MX25).
> > We have 3 files in the arch/arm/dts/imx25*.
> > Should we now remove all of them, create our overlay for karo-tx25 board
> > and include basic file <arm/imx25-karo-tx25.dts> in the top of new overlay
> > file as basic DTS?
>
> Yes, I think that's the way to go.
>
> In the simplest case we have a arch/arm/dts/imx25-karo-tx25.dts with only a
> single line:
>
> #include <arm/imx25-karo-tx25.dts>
>
> Then everything will be used from the upstream dts files. Additional
> barebox specific stuff can be added to that file, like the environment
> description.
> With i.MX25 it happened that we also need SoC specific updates like for
> example the iram which is not mainline. So we need a second line in
> arch/arm/dts/imx25-karo-tx25.dts:
>
> #include "imx25.dtsi"
>
> The goal should be to mainline the SoC specific stuff so that imx25.dtsi
> can be dropped, but I think we need the possibility to have SoC specific
> barebox changes.
OK. Will move in this direction.
PS: As a start I see all arch/arm/dts/*-pinfunc.h could be removed now.
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