linux-kernel - Re: [PATCH] arm64: dts: meson: vim3l: add NNA node

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Date:   Mon, 7 Jun 2021 09:03:49 +0200
From:   Neil Armstrong <narmstrong@...libre.com>
To:     Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        xieqinick@...il.com
Cc:     robh+dt@...nel.org, khilman@...libre.com, jbrunet@...libre.com,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-amlogic@...ts.infradead.org, linux-kernel@...r.kernel.org,
        nick@...das.com, artem@...das.com
Subject: Re: [PATCH] arm64: dts: meson: vim3l: add NNA node

Hi,

On 05/06/2021 11:49, Martin Blumenstingl wrote:
> Hi Nick,
> 
> On Sat, Jun 5, 2021 at 5:09 AM <xieqinick@...il.com> wrote:
>>
>> From: Nick Xie <nick@...das.com>
>>
>> Add Neural Network Accelerator device tree node
>> for Khadas VIM3L.
> we neither have a driver for this upstream nor any binding
> documentation in Documentation/devicetree/bindings/
> are you planning to add this?
> 
> Especially the missing binding documentation is problematic as it
> causes some warnings when validating the .dts files against the
> bindings from Documentation/devicetree/bindings/

Actually the NNA core is a verisilicon VIVANTE core, but I have no idea what is the difference
with the VIVANTE GPU cores ?

the userspace libraries & SDK shipped by Amlogic exposes OpenCL and (AFAIK) NNA over OpenCL, so I think
the HW description should be similar to the current Etnaviv bindings.

Neil

> 
> 
> Best regards,
> Martin
>