Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752778AbaJFNbG (ORCPT ); Mon, 6 Oct 2014 09:31:06 -0400 Received: from mail-wg0-f51.google.com ([74.125.82.51]:59053 "EHLO mail-wg0-f51.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752512AbaJFNbE (ORCPT ); Mon, 6 Oct 2014 09:31:04 -0400 Date: Mon, 6 Oct 2014 15:30:59 +0200 From: Thierry Reding To: Boris Brezillon Cc: David Airlie , dri-devel@lists.freedesktop.org, Nicolas Ferre , Jean-Christophe Plagniol-Villard , Alexandre Belloni , Andrew Victor , Samuel Ortiz , Lee Jones , linux-pwm@vger.kernel.org, Rob Clark , linux-arm-kernel@lists.infradead.org, Rob Herring , Pawel Moll , Mark Rutland , Ian Campbell , Kumar Gala , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Mark Yao Subject: Re: [PATCH v7 10/11] ARM: at91/dt: add LCD panel description to sama5d3xdm.dtsi Message-ID: <20141006133048.GE26921@ulmo> References: <1412175188-28278-1-git-send-email-boris.brezillon@free-electrons.com> <1412175188-28278-11-git-send-email-boris.brezillon@free-electrons.com> <20141006110115.GH25202@ulmo> <20141006142538.76d2df29@bbrezillon> <20141006124014.GD26833@ulmo> <20141006151111.446ed7d6@bbrezillon> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="0QFb0wBpEddLcDHQ" Content-Disposition: inline In-Reply-To: <20141006151111.446ed7d6@bbrezillon> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --0QFb0wBpEddLcDHQ Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Mon, Oct 06, 2014 at 03:11:11PM +0200, Boris Brezillon wrote: > On Mon, 6 Oct 2014 14:40:15 +0200 > Thierry Reding wrote: >=20 > > On Mon, Oct 06, 2014 at 02:25:38PM +0200, Boris Brezillon wrote: > > > On Mon, 6 Oct 2014 13:01:16 +0200 Thierry Reding wrote: > > > > On Wed, Oct 01, 2014 at 04:53:07PM +0200, Boris Brezillon wrote: > > > > [...] > > > > > diff --git a/arch/arm/boot/dts/sama5d3xdm.dtsi b/arch/arm/boot/dt= s/sama5d3xdm.dtsi > > [...] > > > > > + backlight =3D <&backlight>; > > > > > + power-supply =3D <&panel_reg>; > > > > > + #address-cells =3D <1>; > > > > > + #size-cells =3D <0>; > > > > > + status =3D "disabled"; > > > > > + > > > > > + port@0 { > > > > > + #address-cells =3D <1>; > > > > > + #size-cells =3D <0>; > > > > > + > > > > > + panel_input: endpoint@0 { > > > > > + reg =3D <0>; > > > > > + remote-endpoint =3D <&hlcdc_panel_output>; > > > > > + }; > > > > > }; > > > >=20 > > > > There's no support for OF graphs in simple-panel, so this is unused, > > > > isn't it? > > >=20 > > > Actually I use it in my atmel_hlcdc_ouput implementation to figure out > > > the link between a panel and a device connected on the RGB/DPI bus.= =20 > >=20 > > That's kind of weird and one of the reasons why I can't make myself like > > the OF graph bindings. It requires drivers for one device to reach into > > the device tree node of some other device and look for content. Or put > > another way, a DT node for a panel that works on one platform doesn't > > work on another because the display controller needs additional DT > > content that isn't required by the original binding for the panel. >=20 > I also have a working POC of a DPI bus implementation (with DPI support > in panel-simple driver). >=20 > This is a solution I developed to provide a generic DPI implementation > in my HLCDC driver and rely on generic external implementations for > slave devices (panels, encoders, ...). >=20 > But, IIRC, Laurent was not in favor of a bus approach because the DPI > bus is just a data bus and not a control bus. >=20 > Anyway, I'll clean it up and post an RFC. According to the MIPI website there are also control signals and a command set to control display behaviour. Does your implementation handle any of that? Thierry --0QFb0wBpEddLcDHQ Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iQIcBAEBAgAGBQJUMpmIAAoJEN0jrNd/PrOh51YP/0kfP7SQppgCdVaCqJtq3oUw 1C7vEMfDrgGpZzrGkjkPIL600B6xvUsHeVu4zUZPhw14bEM6EBZhPi9KA7xoixDx InbG+sMOTLX+jaQNTVvoJ9WnO6ikAgARKrZWmwUuxsAvFsia8TEJfNPRPYDB7kz6 R/XsA+LXzESjmvPlGtqeuzNKTh8c5o995pSj34WBZ1TeZsbwC8uee/o2Bo8Y9BDg fpDh/lXEmzwWqTiJiE8vxJQOEXwhIsPo6fWrE9RjiTHu2BkEyQyd0ilVZUoedo39 ltbX9NUq4ztnGHKZ7jSNzuq+5yrOzxu2jsiqzvvXYgv3zSCg0snFTT6PjSTMtOE+ iNs7iqDHA3Fc8xZhwWO+FWoEI7S9p7E3TxbaK7axS17vqdDY5BtkBQvMBlW22UYj ejbwMGp4BCv8VNy4kYeelSptr/ANpr/4tpqFS7oJF2cCmEoqzCul/NhdLAFIxn9q ut0sYrdql9JkhqZziBOb7/APyA+ijQhpGxHkEe5TzApkecLRAlL73qlGYsxIBcIo w5boyP1t2nac84UCR7NLy/n2MHTz3IIjsZqYnnxqrkf2+a+5xNyFiAMcbT7roN3M EP0hrq+mCByKiFn4lOogZBxmgUihmJtXTCYnzZHZbOPLiPOKnvZC+9aVfAv3a0rL HnMsg4anSaa6tHS03c9t =yaay -----END PGP SIGNATURE----- --0QFb0wBpEddLcDHQ-- -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/