linux-kernel - Re: [PATCH 2/7] drm/sun4i: support A33 tcon

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Message-ID: <20160905202218.GD8596@lukather>
Date:   Mon, 5 Sep 2016 22:22:18 +0200
From:   Maxime Ripard <maxime.ripard@...e-electrons.com>
To:     Chen-Yu Tsai <wens@...e.org>
Cc:     Daniel Vetter <daniel.vetter@...el.com>,
        David Airlie <airlied@...ux.ie>,
        Thierry Reding <thierry.reding@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-sunxi <linux-sunxi@...glegroups.com>,
        Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
Subject: Re: [PATCH 2/7] drm/sun4i: support A33 tcon

On Fri, Sep 02, 2016 at 02:02:30PM +0800, Chen-Yu Tsai wrote:
> Hi,
> 
> On Thu, Sep 1, 2016 at 11:31 PM, Maxime Ripard
> <maxime.ripard@...e-electrons.com> wrote:
> > The A33 has a significantly different pipeline, with components that differ
> > too.
> >
> > Make sure we had compatible for them.
> >
> > Signed-off-by: Maxime Ripard <maxime.ripard@...e-electrons.com>
> > ---
> >  Documentation/devicetree/bindings/display/sunxi/sun4i-drm.txt | 7 ++++++-
> >  drivers/gpu/drm/sun4i/sun4i_backend.c                         | 1 +
> >  drivers/gpu/drm/sun4i/sun4i_drv.c                             | 8 +++++---
> >  drivers/gpu/drm/sun4i/sun4i_tcon.c                            | 8 +++++++-
> >  4 files changed, 19 insertions(+), 5 deletions(-)
> >
> > diff --git a/Documentation/devicetree/bindings/display/sunxi/sun4i-drm.txt b/Documentation/devicetree/bindings/display/sunxi/sun4i-drm.txt
> > index df8f4aeefe4c..d467ea93ac08 100644
> > --- a/Documentation/devicetree/bindings/display/sunxi/sun4i-drm.txt
> > +++ b/Documentation/devicetree/bindings/display/sunxi/sun4i-drm.txt
> > @@ -26,7 +26,9 @@ TCON
> >  The TCON acts as a timing controller for RGB, LVDS and TV interfaces.
> >
> >  Required properties:
> > - - compatible: value should be "allwinner,sun5i-a13-tcon".
> > + - compatible: value must be either:
> > +   * allwinner,sun5i-a13-tcon
> > +   * allwinner,sun8i-a23-tcon
> 
> From what I can tell from the manuals, the A23 TCON and A33 TCON are
> slightly different. The A23 TCON has channel 1, and it also has DMA
> input. A33 has neither. (Though the DMA chart still lists the TCON DRQ.)
> 
> I think we should have separate compatibles for them. If you think
> otherwise you should mention it in the commit message.

Ack, i will change it in the v2.

Thanks!
Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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