linux-kernel - Re: [PATCH v9 03/13] media: hantro: Use syscon instead of 'ctrl' register

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Message-ID: <831a59b052df02e9860b9766e631a7ab6a37c46a.camel@collabora.com>
Date:   Sun, 16 May 2021 19:40:29 -0300
From:   Ezequiel Garcia <ezequiel@...labora.com>
To:     Lucas Stach <l.stach@...gutronix.de>,
        Benjamin Gaignard <benjamin.gaignard@...labora.com>,
        p.zabel@...gutronix.de, mchehab@...nel.org, robh+dt@...nel.org,
        shawnguo@...nel.org, s.hauer@...gutronix.de, festevam@...il.com,
        lee.jones@...aro.org, gregkh@...uxfoundation.org,
        mripard@...nel.org, paul.kocialkowski@...tlin.com, wens@...e.org,
        jernej.skrabec@...l.net, hverkuil-cisco@...all.nl,
        emil.l.velikov@...il.com, "Peng Fan (OSS)" <peng.fan@....nxp.com>,
        Jacky Bai <ping.bai@....com>
Cc:     devel@...verdev.osuosl.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-rockchip@...ts.infradead.org,
        linux-imx@....com, kernel@...gutronix.de, kernel@...labora.com,
        cphealy@...il.com, linux-arm-kernel@...ts.infradead.org,
        linux-media@...r.kernel.org
Subject: Re: [PATCH v9 03/13] media: hantro: Use syscon instead of 'ctrl'
 register

Hi Lucas,

On Fri, 2021-04-16 at 12:54 +0200, Lucas Stach wrote:
> Am Mittwoch, dem 07.04.2021 um 09:35 +0200 schrieb Benjamin Gaignard:
> > In order to be able to share the control hardware block between
> > VPUs use a syscon instead a ioremap it in the driver.
> > To keep the compatibility with older DT if 'nxp,imx8mq-vpu-ctrl'
> > phandle is not found look at 'ctrl' reg-name.
> > With the method it becomes useless to provide a list of register
> > names so remove it.
> 
> Sorry for putting a spoke in the wheel after many iterations of the
> series.
> 
> We just discussed a way forward on how to handle the clocks and resets
> provided by the blkctl block on i.MX8MM and later and it seems there is
> a consensus on trying to provide virtual power domains from a blkctl
> driver, controlling clocks and resets for the devices in the power
> domain. I would like to avoid introducing yet another way of handling
> the blkctl and thus would like to align the i.MX8MQ VPU blkctl with
> what we are planning to do on the later chip generations.
> 
> CC'ing Jacky Bai and Peng Fan from NXP, as they were going to give this
> virtual power domain thing a shot.
> 

It seems the i.MX8MM BLK-CTL series are moving forward:

https://patchwork.kernel.org/project/linux-arm-kernel/list/?series=479175

... but I'm unable to wrap my head around how this affects the
devicetree VPU modelling for i.MX8MQ (and also i.MX8MM, i.MX8MP, ...).

Can you clarify that?

Thanks,
Ezequiel