linux-kernel - Re: [PATCH V3 7/7] arm64: dts: imx8mp: add interconnect for hsio blk ctrl

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Date:   Tue, 28 Mar 2023 17:11:00 +0200
From:   Marco Felsch <m.felsch@...gutronix.de>
To:     Greg Ungerer <gerg@...ux-m68k.org>
Cc:     peng.fan@....com,
        Alexander Stein <alexander.stein@...tq-group.com>,
        abailon@...libre.com, krzysztof.kozlowski+dt@...aro.org,
        festevam@...il.com, abelvesa@...nel.org, marex@...x.de,
        Markus.Niebel@...tq-group.com,
        Ahmad Fatoum <a.fatoum@...gutronix.de>,
        paul.elder@...asonboard.com, gerg@...nel.org, linux-imx@....com,
        devicetree@...r.kernel.org,
        "Peng Fan (OSS)" <peng.fan@....nxp.com>, linux-pm@...r.kernel.org,
        s.hauer@...gutronix.de, robh+dt@...nel.org, aford173@...il.com,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        laurent.pinchart@...asonboard.com, linux-kernel@...r.kernel.org,
        kernel@...gutronix.de, djakov@...nel.org, shawnguo@...nel.org,
        l.stach@...gutronix.de
Subject: Re: [PATCH V3 7/7] arm64: dts: imx8mp: add interconnect for hsio blk
 ctrl

Hi Greg,

On 23-03-29, Greg Ungerer wrote:
> Hi Marco,

...

> > I forgot to ask: Does your i.MX8MP have a VPU? There are i.MX8MP devices
> > (don't know the name) which don't have support for certain IPs. If this
> 
> The hardware platform I have is using the MIMX8ML4CVNKZAB "i.MX 8M Plus QuadLite"
> (https://www.nxp.com/part/MIMX8ML4CVNKZAB#/) which does not have the hardware
> video encode/decoder module (like the "i.MX 8M Plus Quad" parts).

and that's the problem :) You need to update your bootloader to a
version which support disabling the VPU nodes else you will always see
the errors.

> > is the case the bootloader will fixup your devicetree by disable the
> > corresponding nodes, we call this feature-controller:
> > 
> > https://elixir.bootlin.com/barebox/latest/source/arch/arm/dts/imx8mp.dtsi
> > 
> > As you can see the imx8mp.dtsi is missing the feature bits for the VPU
> > but you can check the i.mx8mm.dtsi. Here you can see that barebox will
> > check the availability of the vpu:
> > 
> > https://elixir.bootlin.com/barebox/latest/source/arch/arm/dts/imx8mm.dtsi
> 
> Ok, thanks, I'll take a look.

Patches are welcome if you use barebox :)

Regards,
  Marco