From patchwork Thu Jan 18 11:23:54 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Brown X-Patchwork-Id: 10172913 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 74A6E60230 for ; Thu, 18 Jan 2018 11:24:14 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 647602684F for ; Thu, 18 Jan 2018 11:24:14 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 59447269DA; Thu, 18 Jan 2018 11:24:14 +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=-6.8 required=2.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_HI,T_DKIM_INVALID autolearn=unavailable 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 01E3A2684F for ; Thu, 18 Jan 2018 11:24:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755222AbeARLX7 (ORCPT ); Thu, 18 Jan 2018 06:23:59 -0500 Received: from heliosphere.sirena.org.uk ([172.104.155.198]:60648 "EHLO heliosphere.sirena.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755121AbeARLX5 (ORCPT ); Thu, 18 Jan 2018 06:23:57 -0500 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=FmpgwtV/OK6eDPqfeWBRS9yzv31zeDBPaIeC0iYaI54=; b=ba40oidYUz7w 834E4dGU98wd5FJ0d+DBuLPP9xW/5/C1oTTSj5p0Zb/K5jeHkwhFqa8mmozVCBhlHt4dGv1gjAuSK puEGxSkRwiG5rgntoerEwotWheewJy/YbtU89Z4cGvFcsezZw6MrqSSYRhmVaqwOlwkNQfdJ+tKtk hcphQ=; Received: from debutante.sirena.org.uk ([2001:470:1f1d:6b5::3] helo=debutante) by heliosphere.sirena.org.uk with esmtpsa (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.89) (envelope-from ) id 1ec8IU-0007Kg-Gl; Thu, 18 Jan 2018 11:23:54 +0000 Received: from broonie by debutante with local (Exim 4.90) (envelope-from ) id 1ec8IU-0003uU-1h; Thu, 18 Jan 2018 11:23:54 +0000 From: Mark Brown To: Maxime Chevallier Cc: Mark Brown , broonie@kernel.org, linux-spi@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, gregory.clement@free-electrons.com, linux-spi@vger.kernel.org Subject: Applied "spi: a3700: Set frequency limits at startup" to the spi tree In-Reply-To: <1516205728-3256-3-git-send-email-maxime.chevallier@smile.fr> Message-Id: Date: Thu, 18 Jan 2018 11:23:54 +0000 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: a3700: Set frequency limits at startup 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 abf3a49e50967bd67cff67f289690f76436f461f Mon Sep 17 00:00:00 2001 From: Maxime Chevallier Date: Wed, 17 Jan 2018 17:15:26 +0100 Subject: [PATCH] spi: a3700: Set frequency limits at startup Armada 3700 SPI controller has an internal clock divider which can divide the parent clock frequency by up to 30. This patch sets the limits in the spi_controller fields so that we can detect when a non-supported frequency is requested by a device for a transfer. Signed-off-by: Maxime Chevallier Signed-off-by: Mark Brown --- drivers/spi/spi-armada-3700.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/spi/spi-armada-3700.c b/drivers/spi/spi-armada-3700.c index 4857b0119556..07f227e3c834 100644 --- a/drivers/spi/spi-armada-3700.c +++ b/drivers/spi/spi-armada-3700.c @@ -27,6 +27,8 @@ #define DRIVER_NAME "armada_3700_spi" +#define A3700_SPI_MAX_SPEED_HZ 100000000 +#define A3700_SPI_MAX_PRESCALE 30 #define A3700_SPI_TIMEOUT 10 /* SPI Register Offest */ @@ -815,6 +817,11 @@ static int a3700_spi_probe(struct platform_device *pdev) goto error; } + master->max_speed_hz = min_t(unsigned long, A3700_SPI_MAX_SPEED_HZ, + clk_get_rate(spi->clk)); + master->min_speed_hz = DIV_ROUND_UP(clk_get_rate(spi->clk), + A3700_SPI_MAX_PRESCALE); + ret = a3700_spi_init(spi); if (ret) goto error_clk;