Received: by 2002:a25:4158:0:0:0:0:0 with SMTP id o85csp6150254yba; Tue, 14 May 2019 02:35:16 -0700 (PDT) X-Google-Smtp-Source: APXvYqyoQTFbkfH4jSUnXgRX7xLqWGhGQFvvEA9eXy1nqE0le+cGt+p773lEHIeT2kfdBBSavQl2 X-Received: by 2002:a62:4118:: with SMTP id o24mr9195169pfa.17.1557826516538; Tue, 14 May 2019 02:35:16 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1557826516; cv=none; d=google.com; s=arc-20160816; b=ov8a9QPd7Ydtn+s8W3tnBkYYxGLU9IqnLZQ1thoa0F7nJ/p+QdXq7JRVX2v+Z6dLeX /sKpZN8HzuJAvuEttRMmL64XC9kVKcncCxEanIMRMDNJOyS/Ra2se//CT+vxg+qsH/45 YI1tAfPFwkYZxS9ISzlg3qFUW8M6EZbEDm40SM2/6ijoJeF4wYEeDg9DlOkzlV4rBoGs z3r2L5W1Tl6tuBvbxeTGZUVzPFWz9btAjpdUXBK2PqRGJK4TJgzuImQnD3esF8hsmI+G 7lqodOjUqs0NIr6hTLGBZTk1ZG0xj+WC9DIqiR6dWwmdjxkLmsBgoemPIwXtwmb/Nhai x7Ng== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:dkim-signature:content-transfer-encoding :content-language:in-reply-to:mime-version:user-agent:date :message-id:from:references:cc:to:subject; bh=SppUGGkQiIfOreEGJ0gp41fqANbwlVGWqwB/RkgMYEs=; b=XuHI4DlxwCBFcziVvrp01ORCBVXqy79fJFrqggjY/kl5B2R3i4YNnlZ+qPgmR9n1ES 4tCyvB+v6fUCQibXbct3YkgiJRRF+RMxSUnGda1sPB3JcNiS60Mx+RXGRMeEaK9UkJi6 oxsG8mSYdQubM9cJlfY+glQpn3dn4ObhhQMyOio9yvPp/2F1QGUlGEfrGxpc2PbCYPTg bk3RbqSvP/BeAp/5ThX0J1gj3jrmOvpfFaLXIJWVY4C0UbFEQ3wvuzM7sIm0/HYk6PDc o3q9azCVsB6BAFb5f3bfkkjxnXHk7kmoM5dK5xkQC+zJoNwZ2nt+wlqeHE4h7zuSfFjx lP1A== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@nvidia.com header.s=n1 header.b=crHKh9Ao; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=nvidia.com Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id q4si18331552plr.376.2019.05.14.02.35.01; Tue, 14 May 2019 02:35:16 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@nvidia.com header.s=n1 header.b=crHKh9Ao; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=nvidia.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726406AbfENJdp (ORCPT + 99 others); Tue, 14 May 2019 05:33:45 -0400 Received: from hqemgate16.nvidia.com ([216.228.121.65]:18670 "EHLO hqemgate16.nvidia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725916AbfENJdp (ORCPT ); Tue, 14 May 2019 05:33:45 -0400 Received: from hqpgpgate101.nvidia.com (Not Verified[216.228.121.13]) by hqemgate16.nvidia.com (using TLS: TLSv1.2, DES-CBC3-SHA) id ; Tue, 14 May 2019 02:33:40 -0700 Received: from hqmail.nvidia.com ([172.20.161.6]) by hqpgpgate101.nvidia.com (PGP Universal service); Tue, 14 May 2019 02:33:44 -0700 X-PGP-Universal: processed; by hqpgpgate101.nvidia.com on Tue, 14 May 2019 02:33:44 -0700 Received: from [10.21.132.148] (10.124.1.5) by HQMAIL107.nvidia.com (172.20.187.13) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Tue, 14 May 2019 09:33:42 +0000 Subject: Re: [PATCH V5 1/4] spi: tegra114: add support for gpio based CS To: Sowjanya Komatineni , , , CC: , , References: <1557810235-16401-1-git-send-email-skomatineni@nvidia.com> <1557810235-16401-2-git-send-email-skomatineni@nvidia.com> From: Jon Hunter Message-ID: Date: Tue, 14 May 2019 10:33:40 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1 MIME-Version: 1.0 In-Reply-To: <1557810235-16401-2-git-send-email-skomatineni@nvidia.com> X-Originating-IP: [10.124.1.5] X-ClientProxiedBy: HQMAIL104.nvidia.com (172.18.146.11) To HQMAIL107.nvidia.com (172.20.187.13) Content-Type: text/plain; charset="utf-8" Content-Language: en-US Content-Transfer-Encoding: 7bit DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nvidia.com; s=n1; t=1557826420; bh=SppUGGkQiIfOreEGJ0gp41fqANbwlVGWqwB/RkgMYEs=; h=X-PGP-Universal:Subject:To:CC:References:From:Message-ID:Date: User-Agent:MIME-Version:In-Reply-To:X-Originating-IP: X-ClientProxiedBy:Content-Type:Content-Language: Content-Transfer-Encoding; b=crHKh9AoTrRZR2t1DyQhwrbWeZ4lfkpx15upl8kl/cm/hIwXkVJXG9BeBeEMgYczS g3ObQFGnRU9MKkFIVbF43wRJYMUEmd1AvWSmHTDtiHnHLAzUJrDHV1iWA91nFSldjR 7uLJV5EgPSWoUB74FTIHFE6MTqXW4hm0+bnxOAKujElHJuwtXdrxsKQ5rm1Le1dhUH qIjva0zeXJ6FAzE0rt8/G5hve+KA3uwe3CgIADJDn2ibk9mAdAsMPW+2ZhgWfqWQ9k Ftg3eZIjzV70+0+1FID2PAoudpAEAyyqTZHmY9RUnZOskfco6yxDsoIo2vYEOLyNLR wLIm4CTzkQYSA== Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 14/05/2019 06:03, Sowjanya Komatineni wrote: > This patch adds support for GPIO based CS control through SPI core > function spi_set_cs. > > Signed-off-by: Sowjanya Komatineni Can you elaborate on the use-case where this is needed? I am curious what platforms are using this and why they would not use the dedicated CS signals. Cheers Jon -- nvpublic