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=-4.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED 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 B83C3C04AB4 for ; Tue, 14 May 2019 09:33:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8B4B521473 for ; Tue, 14 May 2019 09:33:46 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=nvidia.com header.i=@nvidia.com header.b="crHKh9Ao" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726422AbfENJdp (ORCPT ); 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