From patchwork Thu May 11 23:13:15 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Boerge Struempfel X-Patchwork-Id: 681402 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 6B2E4C77B7F for ; Thu, 11 May 2023 23:14:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239465AbjEKXO2 (ORCPT ); Thu, 11 May 2023 19:14:28 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59228 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239420AbjEKXO0 (ORCPT ); Thu, 11 May 2023 19:14:26 -0400 Received: from mail-ej1-x632.google.com (mail-ej1-x632.google.com [IPv6:2a00:1450:4864:20::632]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0C8C059DC; Thu, 11 May 2023 16:14:20 -0700 (PDT) Received: by mail-ej1-x632.google.com with SMTP id a640c23a62f3a-965ab8ed1c0so1524186066b.2; Thu, 11 May 2023 16:14:19 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20221208; t=1683846858; x=1686438858; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=udZm9qn498R0QUgsicv7hzCtWJWxnPlcjDTKukuQ0jk=; b=KfGSMne2sEcVDFYwErj0jDzCKsz9TXKKJ164bQeaYd+FDzQ7iMPeK57IyWfgy/6mhr MibE3cZ9M1E992ODcvCyTI4XFgNAe6kZtdb/jB/TstA0gORlrhfWZxjJrvAXMhasKeOb i5wa7Aht/K+56NSJzrUwVEwKh3Gxx8x+VSDqeD9ZuHdhNjHTasUTYQe5YZ8uht4uUqfn SWKgjLr0/4xJC34u6UvPkBFzTyDK8mmpJnUKYXLnBC7d23NdZq+rr8bmejjfTTsroSjX T0+0ydAQRFJq5I5JmEHvkDOzAhi3Sb1ZUCu60Nd9k4lM2lDDoHDv2fMYUHleRF/gmOwr C9XQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1683846858; x=1686438858; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=udZm9qn498R0QUgsicv7hzCtWJWxnPlcjDTKukuQ0jk=; b=aI0MwHi19jWDngRhY4h1O0gk/wxMGl3FNd9nCegZTC4rvYYmGpVAeWxr5W/APtO4Td BKuMkY1tF3C7G91f9W1NhtCxkqM1jZJLC1+PQ3o7OKlXdo9zADoIgNztqynJpz7QxFb7 jjjY6RVH9W+Q7bJZPyFiREr4Z++9aptn7X/UmJT4ieSQVOM/xUxawTngnCCTSFdDX6QY XyTEHn/gubmTrqkJxvNSY/hTVKBYRCa9LnTUJfF5FT5P2/HICOSxcst/Vdrx5Se1b83c F/YFdV4pw5/GTx7y/9OWNNtjNADcjvwrhhRqnDzTAgSd3DcRHevLIwaEQmpbg6LcJzZA xsEA== X-Gm-Message-State: AC+VfDzAJVjpw9Ypl8+3vHv0OJJUnzLxBFspUxaSi6ju37YKD8z9CM1T RXBDQctVkru+AWWCKCcGqvw= X-Google-Smtp-Source: ACHHUZ6iAlnfrRSk7IuQeZS4b2xJfCvQTlVbacLS+oD75KUuTXUpj3la1tjGEOnfgWLl7OJOEH22xA== X-Received: by 2002:a17:906:eec5:b0:953:4775:baa7 with SMTP id wu5-20020a170906eec500b009534775baa7mr22383355ejb.52.1683846858377; Thu, 11 May 2023 16:14:18 -0700 (PDT) Received: from wslxew193.fritz.box (p200300c7874f2f0049cdad3080524d03.dip0.t-ipconnect.de. [2003:c7:874f:2f00:49cd:ad30:8052:4d03]) by smtp.gmail.com with ESMTPSA id hx8-20020a170906846800b00965e839f56bsm4543023ejc.182.2023.05.11.16.14.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 11 May 2023 16:14:17 -0700 (PDT) From: Boerge Struempfel X-Google-Original-From: Boerge Struempfel Cc: boerge.struempfel@gmail.com, bstruempfel@ultratronik.de, andy.shevchenko@gmail.com, Mark Brown , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Shawn Guo , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam , NXP Linux Team , linux-spi@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH v2 2/4] spi: add SPI_MOSI_IDLE_LOW mode bit Date: Fri, 12 May 2023 01:13:15 +0200 Message-Id: <20230511231317.158214-3-bstruempfel@ultratronik.de> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230511231317.158214-1-bstruempfel@ultratronik.de> References: <20230511135632.78344-1-bstruempfel@ultratronik.de> <20230511231317.158214-1-bstruempfel@ultratronik.de> MIME-Version: 1.0 To: unlisted-recipients:; (no To-header on input) Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org Some spi controller switch the mosi line to high, whenever they are idle. This may not be desired in all use cases. For example neopixel leds can get confused and flicker due to misinterpreting the idle state. Therefore, we introduce a new spi-mode bit, with which the idle behaviour can be overwritten on a per device basis. Signed-off-by: Boerge Struempfel --- drivers/spi/spi.c | 2 ++ include/uapi/linux/spi/spi.h | 3 ++- 2 files changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c index 9291b2a0e8871..3ad538b317a84 100644 --- a/drivers/spi/spi.c +++ b/drivers/spi/spi.c @@ -2260,6 +2260,8 @@ static int of_spi_parse_dt(struct spi_controller *ctlr, struct spi_device *spi, spi->mode |= SPI_LSB_FIRST; if (of_property_read_bool(nc, "spi-cs-high")) spi->mode |= SPI_CS_HIGH; + if (of_property_read_bool(nc, "spi-mosi-idle-low")) + spi->mode |= SPI_MOSI_IDLE_LOW; /* Device DUAL/QUAD mode */ if (!of_property_read_u32(nc, "spi-tx-bus-width", &value)) { diff --git a/include/uapi/linux/spi/spi.h b/include/uapi/linux/spi/spi.h index 9d5f580597039..ca56e477d1619 100644 --- a/include/uapi/linux/spi/spi.h +++ b/include/uapi/linux/spi/spi.h @@ -28,6 +28,7 @@ #define SPI_RX_OCTAL _BITUL(14) /* receive with 8 wires */ #define SPI_3WIRE_HIZ _BITUL(15) /* high impedance turnaround */ #define SPI_RX_CPHA_FLIP _BITUL(16) /* flip CPHA on Rx only xfer */ +#define SPI_MOSI_IDLE_LOW _BITUL(17) /* leave mosi line low when idle */ /* * All the bits defined above should be covered by SPI_MODE_USER_MASK. @@ -37,6 +38,6 @@ * These bits must not overlap. A static assert check should make sure of that. * If adding extra bits, make sure to increase the bit index below as well. */ -#define SPI_MODE_USER_MASK (_BITUL(17) - 1) +#define SPI_MODE_USER_MASK (_BITUL(18) - 1) #endif /* _UAPI_SPI_H */