Re: [PATCH v2 3/3] dt-bindings: media: imx-jpeg: Add clocks property

[Conor Dooley <conor@kernel.org>]

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On Tue, Jul 25, 2023 at 07:31:55AM +0200, Alexander Stein wrote:
> Am Montag, 24. Juli 2023, 20:26:15 CEST schrieb Conor Dooley:
> > On Mon, Jul 24, 2023 at 02:21:00PM +0200, Alexander Stein wrote:
> > > i.MX8 and i.MX8X both use two clocks for accessing the periphery.
> > > Add clocks and clock-names properties accordingly.
> > > 
> > > Signed-off-by: Alexander Stein <alexander.stein@ew.tq-group.com>
> > > ---
> > > Changes in v2:
> > > * None
> > > 
> > >  .../devicetree/bindings/media/nxp,imx8-jpeg.yaml          | 8 ++++++++
> > >  1 file changed, 8 insertions(+)
> > > 
> > > diff --git a/Documentation/devicetree/bindings/media/nxp,imx8-jpeg.yaml
> > > b/Documentation/devicetree/bindings/media/nxp,imx8-jpeg.yaml index
> > > 3d9d1db37040..2533e16720f2 100644
> > > --- a/Documentation/devicetree/bindings/media/nxp,imx8-jpeg.yaml
> > > +++ b/Documentation/devicetree/bindings/media/nxp,imx8-jpeg.yaml
> > > 
> > > @@ -46,6 +46,14 @@ properties:
> > >      minItems: 2               # Wrapper and 1 slot
> > >      maxItems: 5               # Wrapper and 4 slots
> > > 
> > > +  clocks:
> > > +    maxItems: 2
> > > +
> > > +  clock-names:
> > > +    items:
> > > +      - const: per
> > > +      - const: ipg
> > 
> > What do "per" and "ipg" mean? I assume "per" is peripheral?
> 
> Actually I don't know what "ipg" stands for. It's a quite common name on i.MX 
> platforms though. I opted for the names currently used in the DT. The driver 
> doesn't care for the names currently.

FWIW, my motivation was wondering how someone would know which clock to
put in which.

> But cross-checking the reference manual these clocks seems to be called "jpeg" 
> and "ips", individually for both jpeg encoder and decoder.

Hm, that seems confusing TBH. The reference manual is where I would be
going to try and figure out the numbers.

> Mirela (added to recipients): As the original author of the DT nodes, could 
> you provide additional information regarding the clock names?

That'd be great, thanks.

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