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

Ezequiel Garcia ezequiel at collabora.com
Sun May 16 22:40:29 UTC 2021

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:


... 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?


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