From patchwork Tue Jul 17 03:20:51 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Lechner X-Patchwork-Id: 10527991 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 C024A60247 for ; Tue, 17 Jul 2018 03:21:22 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id AC828287A1 for ; Tue, 17 Jul 2018 03:21:22 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id A045628BC1; Tue, 17 Jul 2018 03:21:22 +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=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 52583287A1 for ; Tue, 17 Jul 2018 03:21:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730882AbeGQDvl (ORCPT ); Mon, 16 Jul 2018 23:51:41 -0400 Received: from vern.gendns.com ([206.190.152.46]:35644 "EHLO vern.gendns.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729927AbeGQDvl (ORCPT ); Mon, 16 Jul 2018 23:51:41 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lechnology.com; s=default; h=References:In-Reply-To:Message-Id:Date: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:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=PpySnLgWn8bmOGf6XZtjVve5MFCY3xE3AGy+5AFs+Yg=; b=w5L7aCUfvZTyAKMOvIu1uYgPX yQ3637D8kgMp6ncCZ4fNyCowxgSacMKHPekyyOMSRMOIsWO6EsIbL5ZUapiW9xwqO8k2Z811MvKV0 pFg52JxVq+oapikn9Dg3CrZ1i7L5JmnI/VUzSc+jnHLOix3o1cUsh9dJ2AxVKpyH0ltQX4gyqYZvs Bp7K+x/Mul0CwhIHxlXqCU30jvOyunl4rwxdLRQi41o/Sz0kbh+8XVCgM293jfi0dvS9+2f51Zb6b OBnZ78qNAprBjRKNk64gLhesS6WFuzft64EJsE9K0BRPEs5zHMXnctB5HHwdhz7pH5aWmMl98arAw 9xuNzdekg==; Received: from 108-198-5-147.lightspeed.okcbok.sbcglobal.net ([108.198.5.147]:53228 helo=freyr.lechnology.com) by vern.gendns.com with esmtpsa (TLSv1.2:ECDHE-RSA-AES128-GCM-SHA256:128) (Exim 4.91) (envelope-from ) id 1ffGY8-00CnnZ-KS; Mon, 16 Jul 2018 23:21:16 -0400 From: David Lechner To: linux-spi@vger.kernel.org, linux-iio@vger.kernel.org Cc: David Lechner , Jonathan Cameron , Hartmut Knaack , Lars-Peter Clausen , Peter Meerwald-Stadler , Mark Brown , linux-kernel@vger.kernel.org Subject: [PATCH 3/4] spi: spi-davinci: Add support for SPI_CS_WORD Date: Mon, 16 Jul 2018 22:20:51 -0500 Message-Id: <20180717032052.12273-4-david@lechnology.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20180717032052.12273-1-david@lechnology.com> References: <20180717032052.12273-1-david@lechnology.com> 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: Sender: linux-iio-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This adds support for the SPI_CS_WORD flag to the TI DaVinci SPI driver. This mode can be used as long as we are using the hardware chip select and not a GPIO chip select. Signed-off-by: David Lechner --- drivers/spi/spi-davinci.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) diff --git a/drivers/spi/spi-davinci.c b/drivers/spi/spi-davinci.c index 577084bb911b..8e4b869b50fd 100644 --- a/drivers/spi/spi-davinci.c +++ b/drivers/spi/spi-davinci.c @@ -232,7 +232,8 @@ static void davinci_spi_chipselect(struct spi_device *spi, int value) !(spi->mode & SPI_CS_HIGH)); } else { if (value == BITBANG_CS_ACTIVE) { - spidat1 |= SPIDAT1_CSHOLD_MASK; + if (!(spi->mode & SPI_CS_WORD)) + spidat1 |= SPIDAT1_CSHOLD_MASK; spidat1 &= ~(0x1 << chip_sel); } } @@ -449,8 +450,12 @@ static int davinci_spi_setup(struct spi_device *spi) return retval; } - if (internal_cs) + if (internal_cs) { set_io_bits(dspi->base + SPIPC0, 1 << spi->chip_select); + } else if (spi->mode & SPI_CS_WORD) { + dev_err(&spi->dev, "SPI_CS_WORD can't be use with GPIO CS\n"); + return -EINVAL; + } } if (spi->mode & SPI_READY) @@ -985,7 +990,7 @@ static int davinci_spi_probe(struct platform_device *pdev) dspi->prescaler_limit = pdata->prescaler_limit; dspi->version = pdata->version; - dspi->bitbang.flags = SPI_NO_CS | SPI_LSB_FIRST | SPI_LOOP; + dspi->bitbang.flags = SPI_NO_CS | SPI_LSB_FIRST | SPI_LOOP | SPI_CS_WORD; if (dspi->version == SPI_VERSION_2) dspi->bitbang.flags |= SPI_READY;