From patchwork Tue May 14 04:31:49 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sowjanya Komatineni X-Patchwork-Id: 10941999 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 E9A2D76 for ; Tue, 14 May 2019 04:32:19 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id D8E05285D6 for ; Tue, 14 May 2019 04:32:19 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id CC6C9285DB; Tue, 14 May 2019 04:32:19 +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=-8.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI 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 6D139285D6 for ; Tue, 14 May 2019 04:32:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726774AbfENEcP (ORCPT ); Tue, 14 May 2019 00:32:15 -0400 Received: from hqemgate14.nvidia.com ([216.228.121.143]:13573 "EHLO hqemgate14.nvidia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726314AbfENEcC (ORCPT ); Tue, 14 May 2019 00:32:02 -0400 Received: from hqpgpgate101.nvidia.com (Not Verified[216.228.121.13]) by hqemgate14.nvidia.com (using TLS: TLSv1.2, DES-CBC3-SHA) id ; Mon, 13 May 2019 21:32:07 -0700 Received: from hqmail.nvidia.com ([172.20.161.6]) by hqpgpgate101.nvidia.com (PGP Universal service); Mon, 13 May 2019 21:32:01 -0700 X-PGP-Universal: processed; by hqpgpgate101.nvidia.com on Mon, 13 May 2019 21:32:01 -0700 Received: from HQMAIL105.nvidia.com (172.20.187.12) by HQMAIL107.nvidia.com (172.20.187.13) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Tue, 14 May 2019 04:31:56 +0000 Received: from hqnvemgw02.nvidia.com (172.16.227.111) by HQMAIL105.nvidia.com (172.20.187.12) with Microsoft SMTP Server (TLS) id 15.0.1473.3 via Frontend Transport; Tue, 14 May 2019 04:31:57 +0000 Received: from skomatineni-linux.nvidia.com (Not Verified[10.2.164.159]) by hqnvemgw02.nvidia.com with Trustwave SEG (v7,5,8,10121) id ; Mon, 13 May 2019 21:31:57 -0700 From: Sowjanya Komatineni To: , , , CC: , , , Sowjanya Komatineni Subject: [PATCH V4 1/4] spi: tegra114: add support for gpio based CS Date: Mon, 13 May 2019 21:31:49 -0700 Message-ID: <1557808312-3213-1-git-send-email-skomatineni@nvidia.com> X-Mailer: git-send-email 2.7.4 X-NVConfidentiality: public MIME-Version: 1.0 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nvidia.com; s=n1; t=1557808328; bh=K7F2P173EQjrqPomTsKC7kMVoDELsjl//sPm6PDIsWw=; h=X-PGP-Universal:From:To:CC:Subject:Date:Message-ID:X-Mailer: X-NVConfidentiality:MIME-Version:Content-Type; b=eJ5z0mSbuuxdkGBmsAiS4Dc/cH1ddWPshoZGuFUIatwl+asfYLnqGDjISeUFWC+2A vdP3v9aT7ogUQBtiQsi1eTQ7UL/y07iweG0XitBLKQYmXCd5i3xer51Y646YPtMGzO m6etcsDuVeqoji5Xpgf78TX6WJlM9KSa9io28DukYqTlPiHSnJj3/2BrxDRaNytmTi LFNmS3GOfixiHAG3SieGf52fFJOzSxeaqSg+CzvUjgoA+8Gvt7td/t9uepSV2bb5jz Nmkx94SmJD16HE1yOVW/A6mHMI0AV/fvsleq0WBKqx93t4tApy2RZ06QXj/LiQhg7O dR2A0/ljC615A== 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 This patch adds support for GPIO based CS control through SPI core function spi_set_cs. Signed-off-by: Sowjanya Komatineni --- drivers/spi/spi-tegra114.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/drivers/spi/spi-tegra114.c b/drivers/spi/spi-tegra114.c index b1f31bb16659..f47417dd9edb 100644 --- a/drivers/spi/spi-tegra114.c +++ b/drivers/spi/spi-tegra114.c @@ -776,6 +776,10 @@ static u32 tegra_spi_setup_transfer_one(struct spi_device *spi, } else tegra_spi_writel(tspi, command1, SPI_COMMAND1); + /* GPIO based chip select control */ + if (spi->cs_gpiod) + gpiod_set_value(spi->cs_gpiod, 1); + command1 |= SPI_CS_SW_HW; if (spi->mode & SPI_CS_HIGH) command1 |= SPI_CS_SW_VAL; @@ -864,6 +868,10 @@ static int tegra_spi_setup(struct spi_device *spi) } spin_lock_irqsave(&tspi->lock, flags); + /* GPIO based chip select control */ + if (spi->cs_gpiod) + gpiod_set_value(spi->cs_gpiod, 0); + val = tspi->def_command1_reg; if (spi->mode & SPI_CS_HIGH) val &= ~SPI_CS_POL_INACTIVE(spi->chip_select); @@ -893,6 +901,10 @@ static void tegra_spi_transfer_end(struct spi_device *spi) struct tegra_spi_data *tspi = spi_master_get_devdata(spi->master); int cs_val = (spi->mode & SPI_CS_HIGH) ? 0 : 1; + /* GPIO based chip select control */ + if (spi->cs_gpiod) + gpiod_set_value(spi->cs_gpiod, 0); + if (cs_val) tspi->command1_reg |= SPI_CS_SW_VAL; else @@ -1199,6 +1211,7 @@ static int tegra_spi_probe(struct platform_device *pdev) master->max_speed_hz = 25000000; /* 25MHz */ /* the spi->mode bits understood by this driver: */ + master->use_gpio_descriptors = true; master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_LSB_FIRST | SPI_TX_DUAL | SPI_RX_DUAL | SPI_3WIRE; master->bits_per_word_mask = SPI_BPW_RANGE_MASK(4, 32);