linux-kernel - Re: [PATCH v2 02/66] dt-bindings: interconnect: sunxi: Add V3s mbus compatible

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Date:   Mon, 7 Feb 2022 10:44:16 +0100
From:   Paul Kocialkowski <paul.kocialkowski@...tlin.com>
To:     Jernej Škrabec <jernej.skrabec@...il.com>
Cc:     Samuel Holland <samuel@...lland.org>, linux-media@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-sunxi@...ts.linux.dev, linux-kernel@...r.kernel.org,
        linux-phy@...ts.infradead.org, linux-clk@...r.kernel.org,
        linux-staging@...ts.linux.dev, Yong Deng <yong.deng@...ewell.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Maxime Ripard <mripard@...nel.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Hans Verkuil <hans.verkuil@...co.com>,
        Chen-Yu Tsai <wens@...e.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Helen Koike <helen.koike@...labora.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH v2 02/66] dt-bindings: interconnect: sunxi: Add V3s mbus
 compatible

Hi Jernej,

On Mon 07 Feb 22, 09:50, Jernej Škrabec wrote:
> Hi Paul,
> 
> Dne ponedeljek, 07. februar 2022 ob 09:43:43 CET je Paul Kocialkowski 
> napisal(a):
> > Hi,
> > 
> > On Sat 05 Feb 22, 14:14, Samuel Holland wrote:
> > > On 2/5/22 12:53 PM, Paul Kocialkowski wrote:
> > > > Since the V3s uses the internal mbus, document its compatible.
> > > > 
> > > > Signed-off-by: Paul Kocialkowski <paul.kocialkowski@...tlin.com>
> > > > ---
> > > > 
> > > >  .../devicetree/bindings/arm/sunxi/allwinner,sun4i-a10-mbus.yaml  | 1 +
> > > >  1 file changed, 1 insertion(+)
> > > > 
> > > > diff --git
> > > > a/Documentation/devicetree/bindings/arm/sunxi/allwinner,sun4i-a10-mbus.
> > > > yaml
> > > > b/Documentation/devicetree/bindings/arm/sunxi/allwinner,sun4i-a10-mbus.
> > > > yaml index 29c9961ee2d8..b67bf9261a6a 100644
> > > > ---
> > > > a/Documentation/devicetree/bindings/arm/sunxi/allwinner,sun4i-a10-mbus.
> > > > yaml +++
> > > > b/Documentation/devicetree/bindings/arm/sunxi/allwinner,sun4i-a10-mbus.
> > > > yaml> > 
> > > > @@ -31,6 +31,7 @@ properties:
> > > >        - allwinner,sun5i-a13-mbus
> > > >        - allwinner,sun8i-h3-mbus
> > > >        - allwinner,sun8i-r40-mbus
> > > > 
> > > > +      - allwinner,sun8i-v3s-mbus
> > > 
> > > Please enable the expanded binding added in commit 245578ba9f03
> > > ("dt-bindings: arm: sunxi: Expand MBUS binding")[1] by adding the new
> > > compatible to the "if" block lower in the file. That way we can add V3S
> > > devfreq support in the future without changing that binding.
> > 
> > I had missed that new driver but surely I will expand the updated binding.
> > 
> > By the way do you have an explanation about the cell index given to the
> > interconnects (after &mbus)?
> 
> This is mbus channel. You can find appropriate one checking DRAM driver in U-
> Boot, where mbus is configured.

Thanks, that's exactly what I was looking for! Looks like in my case
MBUS_PORT_CSI will be used both for CSI and ISP.

For the record it's also defined in the BSP kernel at:
include/linux/sunxi_mbus.h

Thanks,

Paul

> Best regards,
> Jernej
> 
> > 
> > Paul
> > 
> > > Regards,
> > > Samuel
> > > 
> > > [1]: https://git.kernel.org/torvalds/c/245578ba9f03
> > > 
> > > >        - allwinner,sun50i-a64-mbus
> > > >    
> > > >    reg:
> 
> 
> 
> 

-- 
Paul Kocialkowski, Bootlin
Embedded Linux and kernel engineering
https://bootlin.com

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