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=-0.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=ham 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 C6A87C43613 for ; Sun, 23 Jun 2019 10:51:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9BF912073F for ; Sun, 23 Jun 2019 10:51:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726523AbfFWKvC (ORCPT ); Sun, 23 Jun 2019 06:51:02 -0400 Received: from mail-out.m-online.net ([212.18.0.9]:41328 "EHLO mail-out.m-online.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726350AbfFWKvC (ORCPT ); Sun, 23 Jun 2019 06:51:02 -0400 Received: from frontend01.mail.m-online.net (unknown [192.168.8.182]) by mail-out.m-online.net (Postfix) with ESMTP id 45Wq354Tdvz1rBNc; Sun, 23 Jun 2019 12:50:57 +0200 (CEST) Received: from localhost (dynscan1.mnet-online.de [192.168.6.70]) by mail.m-online.net (Postfix) with ESMTP id 45Wq353Yhpz1qrQG; Sun, 23 Jun 2019 12:50:57 +0200 (CEST) X-Virus-Scanned: amavisd-new at mnet-online.de Received: from mail.mnet-online.de ([192.168.8.182]) by localhost (dynscan1.mail.m-online.net [192.168.6.70]) (amavisd-new, port 10024) with ESMTP id urD9018kUm2u; Sun, 23 Jun 2019 12:50:56 +0200 (CEST) X-Auth-Info: +p3y079CFfEIMLVv29pcMK0Ow+U7YZFULlYuWhFZ0tc= Received: from [IPv6:::1] (unknown [195.140.253.167]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.mnet-online.de (Postfix) with ESMTPSA; Sun, 23 Jun 2019 12:50:56 +0200 (CEST) Subject: Re: Kernel touch Kconfig consult To: Dmitry Torokhov , "luhua.xu" Cc: Rob Herring , Nick Dyer , Richard Leitner , Martin Kepplinger , linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, weiqi.fu@mediatek.com, wsd_upstream@mediatek.com References: <1560509239.24963.25.camel@mbjsdccf07> <20190623070249.GD204275@dtor-ws> From: Marek Vasut Openpgp: preference=signencrypt Autocrypt: addr=marex@denx.de; 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Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1 MIME-Version: 1.0 In-Reply-To: <20190623070249.GD204275@dtor-ws> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 6/23/19 9:02 AM, Dmitry Torokhov wrote: > Hi, > > On Fri, Jun 14, 2019 at 06:47:19AM -0400, luhua.xu wrote: >> Hi Dmitry,Rob,Marek, Nick,Richard,Martin, >> >> In our customer support experience, many smartphone have two or three >> touch vendor mixture , and customer use one load to support all touches. >> For easy to config touch driver we use kernel config like this down >> below, >> >> We change the config type from 'bool' to 'string'. >> >> config TOUCHSCREEN_MTK_TOUCH >> string "Touch IC name for Mediatek package" >> help >> Set touch IC name if you have touch panel. >> To compile this dirver for used touch IC. >> >> >> And we config touch driver like this： >> CONFIG_TOUCHSCREEN_MTK_TOUCH="GT9886 GT1151 TD4320" >> >> I only use one config to support 3 touches, while we have to use 3 >> config to support 3 touch drivers if we set the config as 'bool'. >> >> So can I use Kconfig like this? >> I do look forward to receiving your reply at your convenience . >> > > I really do not see why having a sting is easier to have than 3 bools, > especially if they pertain to different touch controllers. You must also > have some custom processing of the config above as I am pretty sure our > standard build tools would not work for it. I might be missing something obvious, but isn't DT something you want to use on your ARM device to describe the hardware , instead of hard-coding it into the kernel configuration ? I recently worked with MT6797 (the Gemini PDA SoC), and the vendorkernel does exactly this, it's a spectacular display of ifdeffery and Kconfig chaos, so I suspect this is where the idea of putting stuff into Kconfig comes from. -- Best regards, Marek Vasut