[U-Boot] [PATCH v1 07/11] DTS: Add imx6q-display5-u-boot.dtsi file with u-boot specific properties

[Lukasz Majewski <lukma@denx.de>]

Hi Adam,

> On Sun, Jun 9, 2019 at 3:55 PM Lukasz Majewski <lukma@denx.de> wrote:
> >
> > This file setups UART5 based serial to be used as pre-relocation
> > console in the U-Boot proper.
> >
> > On purpose pinux configuration is omitted here as it has been
> > already done in SPL. For early pre-relocation code we only need the
> > serial device from DTS.
> >
> > Signed-off-by: Lukasz Majewski <lukma@denx.de>
> > ---
> >
> >  arch/arm/dts/imx6q-display5-u-boot.dtsi | 44
> > +++++++++++++++++++++++++++++++++ 1 file changed, 44 insertions(+)
> >  create mode 100644 arch/arm/dts/imx6q-display5-u-boot.dtsi
> >
> > diff --git a/arch/arm/dts/imx6q-display5-u-boot.dtsi
> > b/arch/arm/dts/imx6q-display5-u-boot.dtsi new file mode 100644
> > index 0000000000..b942218b7a
> > --- /dev/null
> > +++ b/arch/arm/dts/imx6q-display5-u-boot.dtsi
> > @@ -0,0 +1,44 @@
> > +// SPDX-License-Identifier: GPL-2.0+
> > +/*
> > + * Copyright 2019
> > + * Lukasz Majewski, DENX Software Engineering, lukma at denx.de
> > + *
> > + * SPDX-License-Identifier:     GPL-2.0+ or X11
> > + */
> > +
> > +/*
> > + * The minimal augmentation DTS U-Boot file to allow UART5
> > + * configuration in the pre-relocation stage of U-Boot
> > + * proper.
> > + *
> > + * As the same UART is already configured in SPL, we don't need
> > + * setup pinmux for it again.
> > + */
> > +
> > +/ {
> > +       aliases {
> > +               mmc0 = &usdhc4;
> > +       };
> > +
> > +       soc {
> > +               u-boot,dm-pre-reloc;
> > +
> > +               aips-bus at 2100000 {
> > +                       u-boot,dm-pre-reloc;
> > +               };
> > +       };  
> 
> You could consider including  arch/arm/dts/imx6qdl-u-boot.dtsi.  This
> would have the soc node, aips-bus node, and the iomuxc and then you
> could just add the uart, stdio-patch and aliases.  It's just a
> suggestion.

Thanks for the suggestion. Indeed in the first draft of this conversion
I indeed used the imx6qdl-u-boot.dts [1] and then included the rest.

However, my goal is to not start any unnecessary devices before
relocation for U-Boot proper (excluding the serial, which is only used).

Unfortunately, the imx6qdl-u-boot.dts defines the above properties as
'u-boot,dm-spl' which I want to avoid (as SPL for now must be left
untouched).

Moreover, the gpio1 and iomux have the 'u-boot,dm-spl' property, which
I do not want to use.

I will probably reuse this file when we convert SPL to DM. 



[1] -
http://git.denx.de/?p=u-boot/u-boot-dfu.git;a=blob;f=arch/arm/dts/imx6qdl-u-boot.dtsi;h=0aa29e38b831deb48db8990bc00929dbd3877a39;hb=refs/heads/master

> 
> 
> adam
> > +
> > +       chosen {
> > +               stdout-path = &uart5;
> > +       };
> > +};
> > +
> > +&i2c3 {
> > +       at24 at 50 {
> > +               u-boot,i2c-offset-len = <2>;
> > +       };
> > +};
> > +
> > +&uart5 {
> > +       u-boot,dm-pre-reloc;
> > +};
> > --
> > 2.11.0
> >  




Best regards,

Lukasz Majewski

--

DENX Software Engineering GmbH,      Managing Director: Wolfgang Denk
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-59 Fax: (+49)-8142-66989-80 Email: lukma at denx.de
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