Re: [PATCH v1 00/23] board: nxp: add the Free Mobile Nodebox v3 CPU Module (LX2160A)

[Vincent Jardin <vjardin@free.fr>]

Hi Peter,

Thanks for the feedbacks, see below.

Le 17/08/26 17:01, Peter Robinson a écrit :
> On Mon, 17 Aug 2026 at 16:32, Vincent Jardin <vjardin@free.fr> wrote:
> >
> >
> > This series adds the Free Mobile Nodebox v3 CPU Module, an NXP
> > LX2160A based board (16x Cortex-A72, DPAA2). U-Boot is the BL33
> > payload of TF-A: BL2 trains the DDR, BL31 hands over, and U-Boot
> > boots a FIT image (kernel + MC firmware + DPC/DPL) from a single
> > FlexSPI NOR. The module plugs onto several carrier boards (NBV30,
> > NBV32, etc.) that share one kernel image but differ in their device
> > tree and DPAA2 data path.
> 
> Why just FIT and not UEFI?

Because this layerscape platform shall not support UEFI by design.

> > The port is modelled on the LX2160ARDB / QDS boards and lives next
> > to them under board/nxp/lx2160a/, reusing their SoC level code.
> > Board specific behaviour is wired through EVENT_SPY hooks rather
> > than weak symbol overrides, and the dependencies each hook needs
> > are forced on by hidden default-y Kconfig bools under
> > `if TARGET_NBXV3`, so a hook cannot silently turn into a no-op.
> >
> > The series is in three stages:
> >
> >  1. Base port and documentation (patches 1-2): TARGET_NBXV3, the
> >     defconfig, a minimal device tree, the MAINTAINERS entry, the
> >     Ethernet wiring file and doc/board/nxp/nbxv3.rst.
> >
> >  2. Board code (patches 3-9): DPAA2 Ethernet on DPMAC17 through the
> >     RTL8211FD PHY; the +0V8_VDD core rail (MPS MPQ8785 PMBus
> >     regulator snapshot, PMBus PSU snapshot, VID fuse driven voltage
> >     trim through UCLASS_REGULATOR); the ${carrier} selection that
> >     lets one FIT carry a DPC/DPL/DTB set per carrier; the ZL30733 /
> >     ZL30643 DPLL traces; the +3V3_FAN rail hook.
> >
> >  3. Build and device tree settings (patches 10-23): one small
> >     commit per peripheral or features, each enabling its DT nodes and
> >     defconfig symbols.
> 
> The device tree should be sent upstream to the Linux kernel and then I
> think most of 10-23 should be compacted to a single patch.

I get your point of Linux first and uboot policy, however, this board
follow the legacy support of other NXP's lx2160/layerscape boards. For
example,

 arch/arm/dts/fsl-lx2160a-rdb.dts
 arch/arm/dts/fsl-lx2160a-qds.dts
 arch/arm/dts/fsl-lx2162a-qds.dts
  ...

and LX2160A defconfigs currently use CONFIG_DEFAULT_DEVICE_TREE without
CONFIG_OF_UPSTREAM.

Moreover, per https://docs.u-boot.org/en/latest/develop/devicetree/control.html,
"Configuration" section: it says that SoC/board maintainers are encouraged to
migrate to dts/upstream/, but also says that when dts/upstream/ has not yet
received the device tree for newly added board support, one option is to add it as:
  arch/<arch>/dts/<name>.dts
with CONFIG_OF_UPSTREAM disabled.

So how would it be acceptable to have fsl-lx2160a-nbxv3.dts under arch/arm/dts/,
consistently with the existing LX2160A boards and the option described in the
U-Boot documentation?

Should those patches 10-23 be 1 commit, I can squash them too: I wanted to record
the logics of each feature sets.

Best regards,
  Vincent