From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.4 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1161FC3B187 for ; Tue, 11 Feb 2020 10:01:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id DDD3120714 for ; Tue, 11 Feb 2020 10:01:43 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=ti.com header.i=@ti.com header.b="sUIBpp2W" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728102AbgBKKBn (ORCPT ); Tue, 11 Feb 2020 05:01:43 -0500 Received: from lelv0142.ext.ti.com ([198.47.23.249]:42994 "EHLO lelv0142.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728083AbgBKKBn (ORCPT ); Tue, 11 Feb 2020 05:01:43 -0500 Received: from fllv0035.itg.ti.com ([10.64.41.0]) by lelv0142.ext.ti.com (8.15.2/8.15.2) with ESMTP id 01BA1YBq032540; Tue, 11 Feb 2020 04:01:34 -0600 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ti.com; s=ti-com-17Q1; t=1581415294; bh=+ZcF4yo1eln9KhwQy1Qd6OUQAx//vdRlxtfqM27rgaU=; h=Subject:From:To:CC:References:Date:In-Reply-To; b=sUIBpp2WaQwT6eNvNRlhL4gP6jnNvR8/vq23Q0q84jJwFfnuAEe8u8YpqIdceX2X8 Bq0xIvCpURcVRDx5Qah8Xi9gE+IBZ+3PL4C/yGY2LVxE8LL+0JHht42DeVRuaAWcIR IdSy+AmSU0CrFYUJaZZXWCCVWZIrLWP6mO0iqnLY= Received: from DLEE108.ent.ti.com (dlee108.ent.ti.com [157.170.170.38]) by fllv0035.itg.ti.com (8.15.2/8.15.2) with ESMTP id 01BA1YZG119993; Tue, 11 Feb 2020 04:01:34 -0600 Received: from DLEE113.ent.ti.com (157.170.170.24) by DLEE108.ent.ti.com (157.170.170.38) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1847.3; Tue, 11 Feb 2020 04:01:33 -0600 Received: from lelv0327.itg.ti.com (10.180.67.183) by DLEE113.ent.ti.com (157.170.170.24) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1847.3 via Frontend Transport; Tue, 11 Feb 2020 04:01:33 -0600 Received: from [192.168.2.6] (ileax41-snat.itg.ti.com [10.172.224.153]) by lelv0327.itg.ti.com (8.15.2/8.15.2) with ESMTP id 01BA1VLH127621; Tue, 11 Feb 2020 04:01:32 -0600 Subject: Re: [PATCH 2/3] ARM: dts: am437x-gp/epos-evm: drop unused panel timings From: Tomi Valkeinen To: Laurent Pinchart , Tony Lindgren , Linux-OMAP CC: , , Thierry Reding , Jyri Sarha , Peter Ujfalusi References: <20191114093950.4101-1-tomi.valkeinen@ti.com> <20191114093950.4101-3-tomi.valkeinen@ti.com> <20191202130459.GH4929@pendragon.ideasonboard.com> <20191211165331.GC43123@atomide.com> <45dae8f7-2f5e-6948-5a05-dc8a09ace1fa@ti.com> <20191212203550.GB4892@pendragon.ideasonboard.com> Message-ID: Date: Tue, 11 Feb 2020 12:01:31 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.4.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset="utf-8"; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 Sender: devicetree-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org On 13/01/2020 14:01, Tomi Valkeinen wrote: > On 12/12/2019 22:35, Laurent Pinchart wrote: >> Hi Tomi, >> >> On Thu, Dec 12, 2019 at 11:37:51AM +0200, Tomi Valkeinen wrote: >>> On 11/12/2019 18:53, Tony Lindgren wrote: >>>> * Laurent Pinchart [191202 13:05]: >>>>> Hi Tomi, >>>>> >>>>> Thank you for the patch. >>>>> >>>>> On Thu, Nov 14, 2019 at 11:39:49AM +0200, Tomi Valkeinen wrote: >>>>>> panel-simple now handled panel osd070t1718-19ts, and we no longer need >>>>>> the panel timings in the DT file. So remove them. >>>>> >>>>> Should you in that case drop the panel-dpi compatible string too, as the >>>>> panel-dpi bindings require panel timings in DT ? >>>> >>>> Yeah sounds like if panel-dpi is no longer usable for this device it >>>> should be dropped from the compatible list. >>> >>> Ok, I agree. >>> >>> Looking at the dts files, panel-dpi is used in a bunch of boards. But >>> we even have 3 dts files with panel-dpi, without the detailed panel >>> model in compatible... >>> >>> Fixing those will break the compatibility with old dtbs and new >>> kernel, unless we add timings-from-dt to a panel driver that handles >>> panel-dpi. >> >> I know, and I don't have a perfect answer for this :-( I don't see a >> third option, it's either breaking DT backward compatibility or adding >> timings parsing to a panel driver (either a new panel-dpi driver or to >> panel-simple). What's your preferred option ? > > Hmm, I just realized that changing these will break omapfb. It relies on panel-dpi and timings from > DT... If no one objects, I think we should just drop the timings from the .dts, and say that these boards are no longer supported with omapfb. I don't think there's much point in trying to keep omapfb working fine for boards that are fully supported by omapdrm. Hopefully soon (in five years? =) we can say that omapdrm supports all the boards, and we can deprecate omapfb. Tomi -- Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki. Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki