linux-kernel - Re: [PATCH 4/5] ARM: dts: rockchip: Add Radxa Carrier board

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Date:   Wed, 20 Nov 2019 19:15:35 +0530
From:   Jagan Teki <jagan@...rulasolutions.com>
To:     Heiko Stübner <heiko@...ech.de>
Cc:     Mark Rutland <mark.rutland@....com>,
        devicetree <devicetree@...r.kernel.org>,
        Tom Cubie <tom@...xa.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        "open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>,
        Rob Herring <robh+dt@...nel.org>,
        Akash Gajjar <akash@...nedev.com>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        linux-amarula <linux-amarula@...rulasolutions.com>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 4/5] ARM: dts: rockchip: Add Radxa Carrier board

Hi Heiko,

On Wed, Nov 20, 2019 at 6:55 PM Heiko Stübner <heiko@...ech.de> wrote:
>
> Hi Jagan,
>
> Am Mittwoch, 20. November 2019, 12:39:22 CET schrieb Jagan Teki:
> > Carrier board often referred as baseboard. For making
> > complete SBC, the associated SOM will mount on top of
> > this carrier board.
> >
> > Radxa has a carrier board which supports on board
> > peripherals, ports like USB-2.0, USB-3.0, HDMI, MIPI DSI/CSI,
> > eDP, Ethernet, PCIe, USB-C, 40-Pin GPIO header and etc.
> >
> > Currently this carrier board can be used together with
> > VMARC RK3399Por SOM for making Rock PI N10 SBC.
> >
> > So add this carrier board dtsi as a separate file in
> > ARM directory, so-that the same can reuse it in both
> > arm32 and arm64 variants of Rockchip SOMs.
>
> Do you really think someone will create an arm32 soc using that
> carrier board?

Yes, we have Rock Pi N8 which is using same carrier board design with
(+ external codec) on top of RK3288 SOM. I didn't mentioned on the
commit message since radxa doesn't officially announced on the
website.

>
> Similarly so far I don't think we haven't even seen a lot of reuse
> of existing carrier boards at all, other than their initial combination.
>
> So maybe just having the content of your
>         rockchip-radxa-carrierboard.dtsi
> in
>         rockchip/rk3399pro-rock-pi-n10.dts
> from patch 5 might be a better start - at least until there is any
> further usage - if at all?

But, this particular design has proper use case.
1. rk3399pro SOM + carrier board (Rock Pi N10)
2. rk3288 SOM + carrier board (Rock Pi N8)

>
> Also rockchip-radxa-carrierboard might even be overly generic
> as there may be multiple carrierboards from Radxa later on.

I'm slightly disagree of having overlay here, since these are fixed
design combinations. where SOM with respective carrier board is
mandatory to make final board. Understand that we can have a
maintenance over-ahead if we have multiple carrier boards, but right
now radxa has only one carrier board with 2 sets of SOM's combinations
that indeed fit like a dev board, so there is unused carrier board.

Jagan.