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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4B775C433EF for ; Mon, 6 Dec 2021 15:24:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1348550AbhLFP2W (ORCPT ); Mon, 6 Dec 2021 10:28:22 -0500 Received: from vern.gendns.com ([98.142.107.122]:44204 "EHLO vern.gendns.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1358707AbhLFPXa (ORCPT ); Mon, 6 Dec 2021 10:23:30 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lechnology.com; s=default; h=Content-Transfer-Encoding:Content-Type: In-Reply-To:MIME-Version:Date:Message-ID:From:References:Cc:To:Subject:Sender :Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help: List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=AF2/R1hXPB3sA1ReHfqnoIHtZukG2PWVyQc/kMCx1Cw=; b=CZmtGEXm7YJUfxTRKJ33Z6yUVI mJ1G0Mc5J4eWoXtaH+RTMI5tYnkjr5e0IOQ/c+OGEIfsNgHSXvrDsvwqMqOcaVKfjSlTBEbq/mNCi S8qOgwGfdjpINXbGYbAZsUg5JxnPjFlZWhkVV1mzP1QnGhal2mrHIgFbyPcZkqJlO7kqV5k9+g/Z3 pReAx3lms6dZlfE8n/wgkgePTQlRVPNReEsoSNhZctchjnYXKJ5huEBYnFfozmDQf5MvY80szbpQo 6x31bCekD327vaQxnIR8eF51rc/Duwh+ZJV0jXf69wO6MJ1QtMs8HnChA+6+EwvPx305jR6f7RElL 1ryzLqaw==; Received: from 108-198-5-147.lightspeed.okcbok.sbcglobal.net ([108.198.5.147]:49496 helo=[192.168.0.134]) by vern.gendns.com with esmtpsa (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 (Exim 4.94.2) (envelope-from ) id 1muFmW-0006Y1-5E; Mon, 06 Dec 2021 10:19:58 -0500 Subject: Re: [PATCH 3/6] dt-bindings: display: sitronix,st7735r: Remove spi-max-frequency limit To: =?UTF-8?Q?Noralf_Tr=c3=b8nnes?= , robh+dt@kernel.org Cc: devicetree@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-fbdev@vger.kernel.org, linux-staging@lists.linux.dev, dave.stevenson@raspberrypi.com, maxime@cerno.tech References: <20211124150757.17929-1-noralf@tronnes.org> <20211124150757.17929-4-noralf@tronnes.org> From: David Lechner Message-ID: <1a094ddf-2190-3586-16b9-8c610e406bc2@lechnology.com> Date: Mon, 6 Dec 2021 09:19:58 -0600 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.14.0 MIME-Version: 1.0 In-Reply-To: <20211124150757.17929-4-noralf@tronnes.org> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - vern.gendns.com X-AntiAbuse: Original Domain - vger.kernel.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - lechnology.com X-Get-Message-Sender-Via: vern.gendns.com: authenticated_id: davidmain+lechnology.com/only user confirmed/virtual account not confirmed X-Authenticated-Sender: vern.gendns.com: davidmain@lechnology.com X-Source: X-Source-Args: X-Source-Dir: Precedence: bulk List-ID: X-Mailing-List: linux-fbdev@vger.kernel.org On 11/24/21 9:07 AM, Noralf Trønnes wrote: > The datasheet lists the minimum Serial clock cycle (Write) as 66ns which is Is this supposed to say "maximum" rather than "minimum"? > 15MHz. Mostly it can do much better than that and is in fact often run at > 32MHz. With a clever driver that runs configuration commands at a low speed > and only the pixel data at the maximum speed the configuration can't be > messed up by transfer errors and the speed is only limited by the amount of > pixel glitches that one is able to tolerate. > > Signed-off-by: Noralf Trønnes > --- Acked-by: David Lechner