From patchwork Wed Aug 29 11:02:32 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Brown X-Patchwork-Id: 10579827 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 2F81E920 for ; Wed, 29 Aug 2018 11:02:42 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 1FFBF2A9E7 for ; Wed, 29 Aug 2018 11:02:42 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 129CE2AA08; Wed, 29 Aug 2018 11:02:42 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.8 required=2.0 tests=BAYES_00,DKIM_SIGNED, MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI,T_DKIM_INVALID autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 8F15E2A9E7 for ; Wed, 29 Aug 2018 11:02:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727268AbeH2O7B (ORCPT ); Wed, 29 Aug 2018 10:59:01 -0400 Received: from heliosphere.sirena.org.uk ([172.104.155.198]:36254 "EHLO heliosphere.sirena.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727099AbeH2O7B (ORCPT ); Wed, 29 Aug 2018 10:59:01 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=sirena.org.uk; s=20170815-heliosphere; h=Date:Message-Id:In-Reply-To: Subject:Cc:To:From:Sender:Reply-To:MIME-Version:Content-Type: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:References: List-Id:List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner: List-Archive; bh=KEUY/m7ncPoikzAtDAHZomF65+x+mhBWFmZLLMrRw3Q=; b=Xwt2Y4xV9vSd WITC0RY94S8H2DICF3Cb5p9I/DmyA8D0FN2+SQxNe1qV3qDqY0CLdqoFt9fArlLjBNzcq6EhhEMsr TX5ESSbzEM6IL61vr9YXVpERq7hYZL23GT7EDR+0OfsnWGtvt53YJhNJmnRJo9fsIvLqKVEdWkH// szlbM=; Received: from cpc102320-sgyl38-2-0-cust46.18-2.cable.virginm.net ([82.37.168.47] helo=debutante.sirena.org.uk) by heliosphere.sirena.org.uk with esmtpa (Exim 4.89) (envelope-from ) id 1fuyF6-0008TB-Du; Wed, 29 Aug 2018 11:02:32 +0000 Received: by debutante.sirena.org.uk (Postfix, from userid 1000) id 2D6081124859; Wed, 29 Aug 2018 12:02:32 +0100 (BST) From: Mark Brown To: Baolin Wang Cc: Mark Brown , broonie@kernel.org, robh+dt@kernel.org, mark.rutland@arm.com, orsonzhai@gmail.com, zhang.lyra@gmail.com, lanqing.liu@spreadtrum.com, baolin.wang@linaro.org, linux-spi@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-spi@vger.kernel.org Subject: Applied "spi: Introduce one new field to set word delay" to the spi tree In-Reply-To: Message-Id: <20180829110232.2D6081124859@debutante.sirena.org.uk> Date: Wed, 29 Aug 2018 12:02:32 +0100 (BST) Sender: linux-spi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-spi@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP The patch spi: Introduce one new field to set word delay has been applied to the spi tree at https://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git All being well this means that it will be integrated into the linux-next tree (usually sometime in the next 24 hours) and sent to Linus during the next merge window (or sooner if it is a bug fix), however if problems are discovered then the patch may be dropped or reverted. You may get further e-mails resulting from automated or manual testing and review of the tree, please engage with people reporting problems and send followup patches addressing any issues that are reported if needed. If any updates are required or you are submitting further changes they should be sent as incremental updates against current git, existing patches will not be replaced. Please add any relevant lists and maintainers to the CCs when replying to this mail. Thanks, Mark From eeaceb8b7d1fb64b6030249ca0dd1d902ef3069e Mon Sep 17 00:00:00 2001 From: Baolin Wang Date: Thu, 16 Aug 2018 20:54:49 +0800 Subject: [PATCH] spi: Introduce one new field to set word delay For some SPI controllers, after each word size (specified by bits_per_word) transimission, the hardware need some delay to make sure the slave has enough time to receive the whole data. So introducing one new 'word_delay' field of struct spi_tansfer for slave devices to set this inter word delay time. Signed-off-by: Baolin Wang Signed-off-by: Mark Brown --- include/linux/spi/spi.h | 3 +++ 1 file changed, 3 insertions(+) diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h index a64235e05321..d698f9db3484 100644 --- a/include/linux/spi/spi.h +++ b/include/linux/spi/spi.h @@ -711,6 +711,8 @@ extern void spi_res_release(struct spi_controller *ctlr, * @delay_usecs: microseconds to delay after this transfer before * (optionally) changing the chipselect status, then starting * the next transfer or completing this @spi_message. + * @word_delay: clock cycles to inter word delay after each word size + * (set by bits_per_word) transmission. * @transfer_list: transfers are sequenced through @spi_message.transfers * @tx_sg: Scatterlist for transmit, currently not for client use * @rx_sg: Scatterlist for receive, currently not for client use @@ -793,6 +795,7 @@ struct spi_transfer { u8 bits_per_word; u16 delay_usecs; u32 speed_hz; + u16 word_delay; struct list_head transfer_list; };