From: Maxime Ripard <maxime.ripard@bootlin.com>
To: Vasily Khoruzhick <anarsoul@gmail.com>
Cc: Mark Rutland <mark.rutland@arm.com>,
devicetree <devicetree@vger.kernel.org>,
Sean Paul <seanpaul@chromium.org>,
David Airlie <airlied@linux.ie>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
linux-kernel <linux-kernel@vger.kernel.org>,
dri-devel <dri-devel@lists.freedesktop.org>,
Andrzej Hajda <a.hajda@samsung.com>, Chen-Yu Tsai <wens@csie.org>,
Rob Herring <robh+dt@kernel.org>, Torsten Duwe <duwe@lst.de>,
Laurent Pinchart <Laurent.pinchart@ideasonboard.com>,
Daniel Vetter <daniel@ffwll.ch>, Harald Geyer <harald@ccbib.org>,
Thierry Reding <thierry.reding@gmail.com>,
Thomas Gleixner <tglx@linutronix.de>,
arm-linux <linux-arm-kernel@lists.infradead.org>,
Icenowy Zheng <icenowy@aosc.io>
Subject: Re: [PATCH v2 7/7] arm64: dts: allwinner: a64: enable ANX6345 bridge on Teres-I
Date: Tue, 9 Jul 2019 10:55:32 +0200 [thread overview]
Message-ID: <20190709085532.cdqv7whuesrjs64c@flea> (raw)
In-Reply-To: <CA+E=qVdsYV2Bxk245=Myq=otd7-7WHzUnSJN8_1dciAzvSOG8g@mail.gmail.com>
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On Mon, Jul 08, 2019 at 05:49:21PM -0700, Vasily Khoruzhick wrote:
> > > Maybe instead of edp-connector one would introduce integrator's specific
> > > connector, for example with compatible "olimex,teres-edp-connector"
> > > which should follow edp abstract connector rules? This will be at least
> > > consistent with below presentation[1] - eDP requirements depends on
> > > integrator. Then if olimex has standard way of dealing with panels
> > > present in olimex/teres platforms the driver would then create
> > > drm_panel/drm_connector/drm_bridge(?) according to these rules, I guess.
> > > Anyway it still looks fishy for me :), maybe because I am not
> > > familiarized with details of these platforms.
> >
> > That makes sense yes
>
> Actually, it makes no sense at all. Current implementation for anx6345
> driver works fine as is with any panel specified assuming panel delays
> are long enough for connected panel. It just doesn't use panel timings
> from the driver. Creating a platform driver for connector itself looks
> redundant since it can't be reused, it doesn't describe actual
> hardware and it's just defeats purpose of DT by introducing
> board-specific code.
I'm not sure where you got the idea that the purpose of DT is to not
have any board-specific code.
It's perfectly fine to have some, that's even why there's a compatible
assigned to each and every board.
What the DT is about is allowing us to have a generic behaviour that
we can detect: we can have a given behaviour for a given board, and a
separate one for another one, and this will be evaluated at runtime.
This is *exactly* what this is about: we can have a compatible that
sets a given, more specific, behaviour (olimex,teres-edp-connector)
while saying that this is compatible with the generic behaviour
(edp-connector). That way, any OS will know what quirk to apply if
needed, and if not that it can use the generic behaviour.
And we could create a generic driver, for the generic behaviour if
needed.
> There's another issue: if we introduce edp-connector we'll have to
> specify power up delays somewhere (in dts? or in platform driver?), so
> edp-connector doesn't really solve the issue of multiple panels with
> same motherboard.
And that's what that compatible is about :)
> I'd say DT overlays should be preferred solution here, not another
> connector binding.
Overlays are a way to apply a device tree dynamically. It's orthogonal
to the binding.
Maxime
--
Maxime Ripard, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com
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next prev parent reply other threads:[~2019-07-09 8:55 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-04 12:21 [PATCH v2 0/7] Add anx6345 DP/eDP bridge for Olimex Teres-I Torsten Duwe
2019-06-04 12:22 ` [PATCH v2 1/7] drm/bridge: move ANA78xx driver to analogix subdirectory Torsten Duwe
2019-06-12 10:16 ` Andrzej Hajda
2019-06-04 12:22 ` [PATCH v2 2/7] drm/bridge: split some definitions of ANX78xx to dedicated headers Torsten Duwe
2019-06-12 7:40 ` Andrzej Hajda
2019-06-04 12:22 ` [PATCH v2 3/7] drm/bridge: extract some Analogix I2C DP common code Torsten Duwe
2019-06-12 7:41 ` Andrzej Hajda
2019-06-04 12:22 ` [PATCH v2 4/7] drm/bridge: Prepare Analogix anx6345 support Torsten Duwe
2019-06-12 7:43 ` Andrzej Hajda
2019-06-04 12:23 ` [PATCH v2 5/7] drm/bridge: Add " Torsten Duwe
2019-06-12 9:13 ` Andrzej Hajda
2019-07-18 16:42 ` Torsten Duwe
2019-06-04 12:23 ` [PATCH v2 6/7] dt-bindings: Add ANX6345 DP/eDP transmitter binding Torsten Duwe
2019-06-12 8:16 ` Andrzej Hajda
2019-06-12 14:59 ` Torsten Duwe
2019-06-04 12:23 ` [PATCH v2 7/7] arm64: dts: allwinner: a64: enable ANX6345 bridge on Teres-I Torsten Duwe
2019-06-04 15:08 ` Vasily Khoruzhick
2019-06-05 10:13 ` Torsten Duwe
2019-06-05 12:02 ` Maxime Ripard
2019-06-06 13:59 ` Harald Geyer
2019-06-07 6:28 ` Maxime Ripard
2019-06-07 9:40 ` Torsten Duwe
2019-06-12 10:00 ` Andrzej Hajda
2019-06-12 15:20 ` Maxime Ripard
2019-06-28 10:39 ` Andrzej Hajda
2019-07-01 9:58 ` Maxime Ripard
2019-07-01 12:27 ` Andrzej Hajda
2019-07-02 8:13 ` Maxime Ripard
2019-07-09 0:49 ` Vasily Khoruzhick
2019-07-09 8:55 ` Maxime Ripard [this message]
2019-07-09 8:58 ` Icenowy Zheng
2019-07-09 14:21 ` Maxime Ripard
2019-07-09 20:30 ` Vasily Khoruzhick
2019-07-10 11:40 ` Maxime Ripard
2019-07-10 22:11 ` Vasily Khoruzhick
2019-07-12 20:15 ` Maxime Ripard
2019-07-16 0:28 ` Vasily Khoruzhick
2019-07-24 13:58 ` Maxime Ripard
2019-06-12 15:34 ` Maxime Ripard
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