linux-kernel - Re: [PATCH v2 3/4] media: rockchip: rga: Add support for the PX30 compatible

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Message-ID: <20200424135552.GI610776@aptenodytes>
Date:   Fri, 24 Apr 2020 15:55:52 +0200
From:   Paul Kocialkowski <paul.kocialkowski@...tlin.com>
To:     Ezequiel Garcia <ezequiel@...labora.com>
Cc:     linux-media@...r.kernel.org, linux-rockchip@...ts.infradead.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Heiko Stuebner <heiko@...ech.de>,
        Hans Verkuil <hansverk@...co.com>,
        justin.swartz@...ingedge.co.za, Johan Jonker <jbx6244@...il.com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH v2 3/4] media: rockchip: rga: Add support for the PX30
 compatible

Hi Ezequiel,

On Fri 24 Apr 20, 09:54, Ezequiel Garcia wrote:
> Hey Paul,
> 
> Thanks for the patch!
> 
> On Thu, 2020-04-23 at 22:09 +0200, Paul Kocialkowski wrote:
> > The PX30 SoC has a RGA block, so add the associated compatible to
> > support it.
> > 
> > Signed-off-by: Paul Kocialkowski <paul.kocialkowski@...tlin.com>
> > ---
> >  drivers/media/platform/rockchip/rga/rga.c | 3 +++
> >  1 file changed, 3 insertions(+)
> > 
> > diff --git a/drivers/media/platform/rockchip/rga/rga.c b/drivers/media/platform/rockchip/rga/rga.c
> > index 9d122429706e..4fb4615662b7 100644
> > --- a/drivers/media/platform/rockchip/rga/rga.c
> > +++ b/drivers/media/platform/rockchip/rga/rga.c
> > @@ -955,6 +955,9 @@ static const struct dev_pm_ops rga_pm = {
> >  };
> >  
> >  static const struct of_device_id rockchip_rga_match[] = {
> > +	{
> > +		.compatible = "rockchip,px30-rga",
> > +	},
> 
> Please note that if you don't have anything px30-specific,
> then you don't need the compatible in the driver.
> 
> You can have something like:
> 
> compatible = "rockchip,px30-rga", "rockchip,rk3288-rga"
> 
> so you need to add it to the bindings. See Justin Swartz
> recent patches for rk3228.

Thanks for the instruction!

I've been a bit confused about that because RK3399 has its own compatible
(without a 2nd rk3288 compatible) although there's nothing different with it
either. All of these rockchip platforms come with what they call "RGA2", that
seems to have no variation across platforms (downstream rockchip even has a
single compatible for it).

Should we add the rk3288 compatible to the rk3399 dtsi? I guess we
can't remove it from the driver at this point, for backward compatibility
with previous dts (what a strange idea...).

> Down the road, if you find something specific for px30,
> you can make the driver aware. 

Makes sense, yes.

Cheers,

Paul

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

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