linux-kernel - Re: [PATCH 1/8] drm/sun4i: Add compatible strings for A80 TCONs

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Message-ID: <20180318030014.4rkxe4huxxhslj3v@rob-hp-laptop>
Date:   Sun, 18 Mar 2018 07:52:12 -0500
From:   Rob Herring <robh@...nel.org>
To:     Chen-Yu Tsai <wens@...e.org>
Cc:     Maxime Ripard <maxime.ripard@...tlin.com>,
        Mark Rutland <mark.rutland@....com>,
        David Airlie <airlied@...ux.ie>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/8] drm/sun4i: Add compatible strings for A80 TCONs

On Thu, Mar 15, 2018 at 07:41:29PM +0800, Chen-Yu Tsai wrote:
> The A80 has 2 or 3 TCONs. The documentation and vendor kernel are very
> vague about the third TCON, to the point that it might not exist.
> 
> In the documentation, the first TCON is missing channel 1, and the
> second is missing channel 0. However the vendor kernel seems to be
> able to use them regardless. Here we model them like the old TCONs.
> 
> An oddity is that TCON0 requires the reset control for the eDP block
> to be deasserted, for any register access to stick.
> 
> This patch adds compatible strings for TCON0 and TCON1, with TCON0
> requiring an extra "edp" reset control.
> 
> Signed-off-by: Chen-Yu Tsai <wens@...e.org>
> ---
>  Documentation/devicetree/bindings/display/sunxi/sun4i-drm.txt | 11 ++++++++---
>  1 file changed, 8 insertions(+), 3 deletions(-)

Reviewed-by: Rob Herring <robh@...nel.org>