From patchwork Thu Sep 18 17:08:56 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andy Shevchenko X-Patchwork-Id: 4932891 Return-Path: X-Original-To: patchwork-linux-spi@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 5ED47BEEA5 for ; Thu, 18 Sep 2014 17:10:11 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 4201D201EC for ; Thu, 18 Sep 2014 17:10:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 0B03F201E4 for ; Thu, 18 Sep 2014 17:10:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932430AbaIRRKH (ORCPT ); Thu, 18 Sep 2014 13:10:07 -0400 Received: from mga02.intel.com ([134.134.136.20]:55750 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932117AbaIRRKG (ORCPT ); Thu, 18 Sep 2014 13:10:06 -0400 Received: from orsmga002.jf.intel.com ([10.7.209.21]) by orsmga101.jf.intel.com with ESMTP; 18 Sep 2014 10:09:08 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.04,548,1406617200"; d="scan'208";a="604930550" Received: from smile.fi.intel.com (HELO smile) ([10.237.72.168]) by orsmga002.jf.intel.com with ESMTP; 18 Sep 2014 10:09:03 -0700 Received: from andy by smile with local (Exim 4.84) (envelope-from ) id 1XUfCY-0000lS-Do; Thu, 18 Sep 2014 20:09:02 +0300 From: Andy Shevchenko To: Vinod Koul , Mark Brown , dmaengine@vger.kernel.org, linux-spi@vger.kernel.org Cc: Andy Shevchenko Subject: [PATCH 06/10] spi: dw: introduce support of loopback mode Date: Thu, 18 Sep 2014 20:08:56 +0300 Message-Id: <1411060140-2801-7-git-send-email-andriy.shevchenko@linux.intel.com> X-Mailer: git-send-email 2.1.0 In-Reply-To: <1411060140-2801-1-git-send-email-andriy.shevchenko@linux.intel.com> References: <1411060140-2801-1-git-send-email-andriy.shevchenko@linux.intel.com> Sender: linux-spi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-spi@vger.kernel.org X-Spam-Status: No, score=-7.5 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP For testing purposes it's good to have a loopback mode enabled. The patch adds necessary bits for that. Signed-off-by: Andy Shevchenko --- drivers/spi/spi-dw.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/spi/spi-dw.c b/drivers/spi/spi-dw.c index d58edfe..54e195b 100644 --- a/drivers/spi/spi-dw.c +++ b/drivers/spi/spi-dw.c @@ -599,6 +599,9 @@ static int dw_spi_setup(struct spi_device *spi) | (spi->mode << SPI_MODE_OFFSET) | (chip->tmode << SPI_TMOD_OFFSET); + if (spi->mode & SPI_LOOP) + chip->cr0 |= 1 << SPI_SRL_OFFSET; + if (gpio_is_valid(spi->cs_gpio)) { ret = gpio_direction_output(spi->cs_gpio, !(spi->mode & SPI_CS_HIGH)); @@ -666,7 +669,7 @@ int dw_spi_add_host(struct device *dev, struct dw_spi *dws) goto err_free_master; } - master->mode_bits = SPI_CPOL | SPI_CPHA; + master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_LOOP; master->bits_per_word_mask = SPI_BPW_MASK(8) | SPI_BPW_MASK(16); master->bus_num = dws->bus_num; master->num_chipselect = dws->num_cs;