From patchwork Fri Apr 15 14:22:06 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Zhou Yanjie X-Patchwork-Id: 562781 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3AC39C4332F for ; Fri, 15 Apr 2022 14:23:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1354473AbiDOOZa (ORCPT ); Fri, 15 Apr 2022 10:25:30 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53626 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1354531AbiDOOZC (ORCPT ); Fri, 15 Apr 2022 10:25:02 -0400 Received: from out28-124.mail.aliyun.com (out28-124.mail.aliyun.com [115.124.28.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2D6A942A18; Fri, 15 Apr 2022 07:22:22 -0700 (PDT) X-Alimail-AntiSpam: AC=CONTINUE; BC=0.07693846|-1; CH=green; DM=|CONTINUE|false|; DS=CONTINUE|ham_regular_dialog|0.00416793-0.000623925-0.995208; FP=0|0|0|0|0|-1|-1|-1; HT=ay29a033018047192; MF=zhouyanjie@wanyeetech.com; NM=1; PH=DS; RN=15; RT=15; SR=0; TI=SMTPD_---.NRMqfU2_1650032538; Received: from zhouyanjie-virtual-machine.localdomain(mailfrom:zhouyanjie@wanyeetech.com fp:SMTPD_---.NRMqfU2_1650032538) by smtp.aliyun-inc.com(33.32.109.194); Fri, 15 Apr 2022 22:22:19 +0800 From: =?utf-8?b?5ZGo55Cw5p2wIChaaG91IFlhbmppZSk=?= To: broonie@kernel.org, robh+dt@kernel.org, krzk+dt@kernel.org Cc: linux-spi@vger.kernel.org, linux-mips@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, paul@crapouillou.net, contact@artur-rojek.eu, dongsheng.qiu@ingenic.com, aric.pzqi@ingenic.com, rick.tyliu@ingenic.com, sernia.zhou@foxmail.com, zhenwenjin@gmail.com, reimu@sudomaker.com Subject: [PATCH 1/3] SPI: Ingenic: Add support for use GPIO as chip select line. Date: Fri, 15 Apr 2022 22:22:06 +0800 Message-Id: <1650032528-118220-2-git-send-email-zhouyanjie@wanyeetech.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1650032528-118220-1-git-send-email-zhouyanjie@wanyeetech.com> References: <1650032528-118220-1-git-send-email-zhouyanjie@wanyeetech.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-spi@vger.kernel.org Add support for using GPIOs as chip select lines on Ingenic SoCs. Signed-off-by: 周琰杰 (Zhou Yanjie) --- drivers/spi/spi-ingenic.c | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) diff --git a/drivers/spi/spi-ingenic.c b/drivers/spi/spi-ingenic.c index 03077a7..672e4ed 100644 --- a/drivers/spi/spi-ingenic.c +++ b/drivers/spi/spi-ingenic.c @@ -380,7 +380,7 @@ static int spi_ingenic_probe(struct platform_device *pdev) struct spi_controller *ctlr; struct ingenic_spi *priv; void __iomem *base; - int ret; + int num_cs, ret; pdata = of_device_get_match_data(dev); if (!pdata) { @@ -416,6 +416,11 @@ static int spi_ingenic_probe(struct platform_device *pdev) if (IS_ERR(priv->flen_field)) return PTR_ERR(priv->flen_field); + if (of_property_read_u32(dev->of_node, "num-cs", &num_cs)) { + dev_warn(dev, "Number of chip select lines not specified.\n"); + num_cs = 2; + } + platform_set_drvdata(pdev, ctlr); ctlr->prepare_transfer_hardware = spi_ingenic_prepare_hardware; @@ -429,7 +434,9 @@ static int spi_ingenic_probe(struct platform_device *pdev) ctlr->bits_per_word_mask = pdata->bits_per_word_mask; ctlr->min_speed_hz = 7200; ctlr->max_speed_hz = 54000000; - ctlr->num_chipselect = 2; + ctlr->use_gpio_descriptors = true; + ctlr->max_native_cs = 2; + ctlr->num_chipselect = num_cs; ctlr->dev.of_node = pdev->dev.of_node; if (spi_ingenic_request_dma(ctlr, dev))