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,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 1FDA1C83000 for ; Tue, 28 Apr 2020 09:49:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id F2C5B2072A for ; Tue, 28 Apr 2020 09:49:46 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=ti.com header.i=@ti.com header.b="BV2Zxe4i" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727023AbgD1Jtp (ORCPT ); Tue, 28 Apr 2020 05:49:45 -0400 Received: from fllv0015.ext.ti.com ([198.47.19.141]:33940 "EHLO fllv0015.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726971AbgD1Jtp (ORCPT ); Tue, 28 Apr 2020 05:49:45 -0400 Received: from lelv0265.itg.ti.com ([10.180.67.224]) by fllv0015.ext.ti.com (8.15.2/8.15.2) with ESMTP id 03S9nVvV082105; Tue, 28 Apr 2020 04:49:31 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ti.com; s=ti-com-17Q1; t=1588067371; bh=vi0lak+PESiDwZ0/mkWQsOclkMxH3g4XyeOihRduJy0=; h=Subject:To:CC:References:From:Date:In-Reply-To; b=BV2Zxe4iPkNu9gqmZtuR65pMPOlIdfT97ro6vS3YbgPm2ft2TJUXz7uNUjFjrMRQC bsuhpdiehprVO7oAn7t1LvTtcfkfzR6Ob62FFWFZes+xUeE2O97t3nlCpHbVi83wMH HblNblvH7SfOJO0jzx3pMKO4p0Wu6nP+1TWjcxLc= Received: from DFLE103.ent.ti.com (dfle103.ent.ti.com [10.64.6.24]) by lelv0265.itg.ti.com (8.15.2/8.15.2) with ESMTPS id 03S9nVL8026251 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=FAIL); Tue, 28 Apr 2020 04:49:31 -0500 Received: from DFLE103.ent.ti.com (10.64.6.24) by DFLE103.ent.ti.com (10.64.6.24) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1979.3; Tue, 28 Apr 2020 04:49:31 -0500 Received: from fllv0039.itg.ti.com (10.64.41.19) by DFLE103.ent.ti.com (10.64.6.24) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1979.3 via Frontend Transport; Tue, 28 Apr 2020 04:49:31 -0500 Received: from [192.168.2.6] (ileax41-snat.itg.ti.com [10.172.224.153]) by fllv0039.itg.ti.com (8.15.2/8.15.2) with ESMTP id 03S9nS0F037890; Tue, 28 Apr 2020 04:49:29 -0500 Subject: Re: [RFC PATCH] dt-bindings: display: ti,tfp410.txt: convert to yaml To: =?UTF-8?Q?Ricardo_Ca=c3=b1uelo?= , , Laurent Pinchart CC: , , , , References: <20200428092048.14939-1-ricardo.canuelo@collabora.com> From: Tomi Valkeinen Message-ID: <3e377c73-25a3-a7b3-0604-41c54d70039e@ti.com> Date: Tue, 28 Apr 2020 12:49:28 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.7.0 MIME-Version: 1.0 In-Reply-To: <20200428092048.14939-1-ricardo.canuelo@collabora.com> Content-Type: text/plain; charset="utf-8"; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit 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 28/04/2020 12:20, Ricardo Cañuelo wrote: > 2) The definition of ti,deskew in the original binding seems to be > tailored to the current driver and the way it's defined may not be very > DT-friendly. > > This parameter maps to a 3-bit field in a hardware register that takes > a value from 0 to 7, so the [-4, 3] range described for this would map > to [000, 111]: -4 -> 000, -3 -> 001, -2 -> 010, ... 3 -> 111. > > Then, the driver parses the parameter (unsigned) and casts it to a > signed integer to get a number in the [-4, 3] range. Interestingly the current example has ti,deskew = <4>... > A vendor-specific property must have a type definition in json-schema, > so if I translate the original bindings semantics directly, I should > define ti,deskew as an int32, but this makes dt_binding_check fail if > the property has a negative value in the example because of the > internal representation of cells as unsigned integers: > > ti,deskew:0:0: 4294967293 is greater than the maximum of 2147483647 I don't quite understand this. We cannot have negative numbers in dts files? Or we can, but dt_binding_check doesn't handle them correctly? Or that int32 is not supported in yaml bindings? > So I can think of two solutions to this: > > a) Keep the ti,deskew property as an uint32 and document the valid > range ([-4, 3]) in the property description (this is what this patch > does currently). > > b) Redefine this property to be closer to the datasheet description > (ie. unsigned integers from 0 to 7) and adapt the driver accordingly. > This would also let us define its range properly using minimum and > maximum properties for it. > > I think (b) is the right thing to do but I want to know your > opinion. Besides, I don't have this hardware at hand and if I updated > the driver I wouldn't be able to test it. I don't think anyone has used deskew property, so I guess changing it is not out of the question. Laurent, did you have a board that needs deskew when you added it to tfp410? Tomi -- Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki. Y-tunnus/Business ID: 0615521-4. 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Tue, 28 Apr 2020 04:49:31 -0500 Received: from DFLE103.ent.ti.com (10.64.6.24) by DFLE103.ent.ti.com (10.64.6.24) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1979.3; Tue, 28 Apr 2020 04:49:31 -0500 Received: from fllv0039.itg.ti.com (10.64.41.19) by DFLE103.ent.ti.com (10.64.6.24) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1979.3 via Frontend Transport; Tue, 28 Apr 2020 04:49:31 -0500 Received: from [192.168.2.6] (ileax41-snat.itg.ti.com [10.172.224.153]) by fllv0039.itg.ti.com (8.15.2/8.15.2) with ESMTP id 03S9nS0F037890; Tue, 28 Apr 2020 04:49:29 -0500 Subject: Re: [RFC PATCH] dt-bindings: display: ti,tfp410.txt: convert to yaml To: =?UTF-8?Q?Ricardo_Ca=c3=b1uelo?= , , Laurent Pinchart References: <20200428092048.14939-1-ricardo.canuelo@collabora.com> From: Tomi Valkeinen Message-ID: <3e377c73-25a3-a7b3-0604-41c54d70039e@ti.com> Date: Tue, 28 Apr 2020 12:49:28 +0300 User-Agent: Mozilla/5.0 (X11; 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Tue, 28 Apr 2020 04:49:31 -0500 Received: from [192.168.2.6] (ileax41-snat.itg.ti.com [10.172.224.153]) by fllv0039.itg.ti.com (8.15.2/8.15.2) with ESMTP id 03S9nS0F037890; Tue, 28 Apr 2020 04:49:29 -0500 Subject: Re: [RFC PATCH] dt-bindings: display: ti,tfp410.txt: convert to yaml To: =?UTF-8?Q?Ricardo_Ca=c3=b1uelo?= , , Laurent Pinchart References: <20200428092048.14939-1-ricardo.canuelo@collabora.com> From: Tomi Valkeinen Message-ID: <3e377c73-25a3-a7b3-0604-41c54d70039e@ti.com> Date: Tue, 28 Apr 2020 12:49:28 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.7.0 MIME-Version: 1.0 In-Reply-To: <20200428092048.14939-1-ricardo.canuelo@collabora.com> Content-Language: en-US X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: devicetree@vger.kernel.org, kernel@collabora.com, linux-arm-kernel@lists.infradead.org, dri-devel@lists.freedesktop.org, jason@lakedaemon.net Content-Transfer-Encoding: base64 Content-Type: text/plain; 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