linux-kernel - Re: [PATCH 07/27] dt-bindings: clock: sun8i-de2: Add H6 DE3 clock description

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Date:   Tue, 4 Sep 2018 17:05:16 +0800
From:   Chen-Yu Tsai <wens@...e.org>
To:     Jernej Skrabec <jernej.skrabec@...l.net>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        Mark Rutland <mark.rutland@....com>,
        Mike Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        David Airlie <airlied@...ux.ie>,
        Archit Taneja <architt@...eaurora.org>,
        Andrzej Hajda <a.hajda@...sung.com>,
        devicetree <devicetree@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-clk <linux-clk@...r.kernel.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        linux-sunxi <linux-sunxi@...glegroups.com>
Subject: Re: [PATCH 07/27] dt-bindings: clock: sun8i-de2: Add H6 DE3 clock description

On Tue, Sep 4, 2018 at 4:59 PM Chen-Yu Tsai <wens@...e.org> wrote:
>
> Hi,
>
> On Sun, Sep 2, 2018 at 3:27 PM Jernej Skrabec <jernej.skrabec@...l.net> wrote:
> >
> > This commit adds necessary description and dt includes for H6 DE3 clock.
> > It is very similar to others, but memory region has some additional
> > registers not found in DE2.
> >
> > Signed-off-by: Jernej Skrabec <jernej.skrabec@...l.net>
> > ---
> >  Documentation/devicetree/bindings/clock/sun8i-de2.txt | 5 +++--
> >  include/dt-bindings/clock/sun8i-de2.h                 | 3 +++
> >  include/dt-bindings/reset/sun8i-de2.h                 | 1 +
> >  3 files changed, 7 insertions(+), 2 deletions(-)
> >
> > diff --git a/Documentation/devicetree/bindings/clock/sun8i-de2.txt b/Documentation/devicetree/bindings/clock/sun8i-de2.txt
> > index e94582e8b8a9..41a52c2acffd 100644
> > --- a/Documentation/devicetree/bindings/clock/sun8i-de2.txt
> > +++ b/Documentation/devicetree/bindings/clock/sun8i-de2.txt
> > @@ -1,5 +1,5 @@
> > -Allwinner Display Engine 2.0 Clock Control Binding
> > ---------------------------------------------------
> > +Allwinner Display Engine 2.0/3.0 Clock Control Binding
> > +------------------------------------------------------
> >
> >  Required properties :
> >  - compatible: must contain one of the following compatibles:
> > @@ -8,6 +8,7 @@ Required properties :
> >                 - "allwinner,sun8i-v3s-de2-clk"
> >                 - "allwinner,sun50i-a64-de2-clk"
> >                 - "allwinner,sun50i-h5-de2-clk"
> > +               - "allwinner,sun50i-h6-de3-clk"
> >
> >  - reg: Must contain the registers base address and length
> >  - clocks: phandle to the clocks feeding the display engine subsystem.
> > diff --git a/include/dt-bindings/clock/sun8i-de2.h b/include/dt-bindings/clock/sun8i-de2.h
> > index 3bed63b524aa..7768f73b051e 100644
> > --- a/include/dt-bindings/clock/sun8i-de2.h
> > +++ b/include/dt-bindings/clock/sun8i-de2.h
> > @@ -15,4 +15,7 @@
> >  #define CLK_MIXER1             7
> >  #define CLK_WB                 8
> >
> > +#define CLK_BUS_ROT            9
> > +#define CLK_ROT                        10
> > +
> >  #endif /* _DT_BINDINGS_CLOCK_SUN8I_DE2_H_ */
> > diff --git a/include/dt-bindings/reset/sun8i-de2.h b/include/dt-bindings/reset/sun8i-de2.h
> > index 9526017432f0..1c36a6ac86d6 100644
> > --- a/include/dt-bindings/reset/sun8i-de2.h
> > +++ b/include/dt-bindings/reset/sun8i-de2.h
> > @@ -10,5 +10,6 @@
> >  #define RST_MIXER0     0
> >  #define RST_MIXER1     1
> >  #define RST_WB         2
> > +#define RST_ROT                3
>
> Looking at the DE 2.0 register guide, the "Rotate" related fields are also
> found on the A83T. So this is not DE 3.0 specific. And you could also have
> the H6 DE3 compatible fall back to the A83T for the common parts.

I take that back. The A83T has a different clock tree structure because it
lacks the DE mod clock, so it's not compatible.

> ChenYu
>
> >
> >  #endif /* _DT_BINDINGS_RESET_SUN8I_DE2_H_ */
> > --
> > 2.18.0
> >