linux-kernel - Re: [PATCH v4 3/3] arm64: dts: ti: Add support for Siemens IOT2050 boards

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Message-ID: <20210311142151.5o54k7kmrnatufcw@target>
Date:   Thu, 11 Mar 2021 08:21:51 -0600
From:   Nishanth Menon <nm@...com>
To:     Jan Kiszka <jan.kiszka@...mens.com>
CC:     Tero Kristo <kristo@...nel.org>, Rob Herring <robh+dt@...nel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        Le Jin <le.jin@...mens.com>,
        Bao Cheng Su <baocheng.su@...mens.com>,
        Vignesh Raghavendra <vigneshr@...com>
Subject: Re: [PATCH v4 3/3] arm64: dts: ti: Add support for Siemens IOT2050
 boards

On 15:14-20210311, Jan Kiszka wrote:

[...]

> > 
> > See [1] compare the compatibles against
> > Documentation/devicetree/bindings -> I think you should describe what
> > your hardware really is though.
> 
> This SPI bus is routed to an Arduino connector. By default, userspace
> (e.g. mraa) takes ownership and adds the desired logic for what is being
> connected. We have no idea what shield or other extension the user adds,
> though.

overlays look like the right approach for variable systems like these.
It is not exactly plug and play.. but it does provide a level of
flexibility that is helpful.

[..]
> The problem here is not simple txt->yml conversion: There is no official
> binding for spidev yet, just existing users and the driver waiting for them.
> 

I think we should discuss in the spidev list to get it resolved.

> > Thanks.. While it might help me personally to get some on my internal
> > farm, it might be good to get them on kernelci as well on the longer
> > run.
> > 
> 
> Will keep that on the radar. I definitely want to get it into the CIP
> LAVA lab which is testing LTS as well.

Cool.

> Are we talking about spidev here? Then let's drop that node, but I do
> need to know how to describe spidev properly

yes - the spidev is my problem. can you drop the node and repost? i cant
locally modify and hope it works.

> 
> Or is it about those other warnings coming from your dtsi files, now
> being surfaced? If you can tell me how to resolve them, I can write patches.

I will look at the warnings later today.. I dont think they are
triggered by the board dts.

-- 
Regards,
Nishanth Menon
Key (0xDDB5849D1736249D)/Fingerprint: F8A2 8693 54EB 8232 17A3  1A34 DDB5 849D 1736 249D