From patchwork Sun May 19 18:10:39 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: egyszeregy@freemail.hu X-Patchwork-Id: 797838 Received: from smtp-out.freemail.hu (fmfe12.freemail.hu [46.107.16.205]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4062E58AB4; Sun, 19 May 2024 18:17:57 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=46.107.16.205 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1716142681; cv=none; b=Ibpn64aFfLOLoVkwDtirQxE5XisRBmxcJ5NR8iQGp0wnl/zxDPli+jysu623Uwi98mx81tNUKPBgdbi38YdIYFy5IhBCsdae12k8oxZXETKb+6U8fdn/Tc+yUbj267ApRsa4sl2TOY7e4f1hwS7+Ed34kUKqbesEGkJDmu8IQxU= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1716142681; c=relaxed/simple; bh=EJ6Foab+qlu7VNhHLMIvKehDQVVIHCOMsiMv3cp3kn8=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version:Content-Type; b=k+DbvtVr1bfoizTd8fnDUbLunuLpDNxRmC05qyJwmv525FHCbafJGXYGh7lMkwa8n1nntswoMPdD7icLUuLHocoyR4LDIicwgOi0Yh6QMKsSKbfZtsOCsbuNS0y4PhXnKZg5LghBzIjEnyFUfouJv+lGDe1+DS/2WrSbHBfpehU= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=freemail.hu; spf=pass smtp.mailfrom=freemail.hu; dkim=fail (2048-bit key) header.d=freemail.hu header.i=@freemail.hu header.b=0hWgjmKN reason="signature verification failed"; arc=none smtp.client-ip=46.107.16.205 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=freemail.hu Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=freemail.hu Authentication-Results: smtp.subspace.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=freemail.hu header.i=@freemail.hu header.b="0hWgjmKN" Received: from fizweb.elte.hu (fizweb.elte.hu [157.181.183.248]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by smtp.freemail.hu (Postfix) with ESMTPSA id 4Vj7zb1121z6b; Sun, 19 May 2024 20:10:51 +0200 (CEST) From: egyszeregy@freemail.hu To: broonie@kernel.org, linux-spi@vger.kernel.org, linux-kernel@vger.kernel.org Cc: =?utf-8?q?Benjamin_Sz=C5=91ke?= Subject: [PATCH] spidev: Introduce "linux,spidev-name" property for device tree of spidev. Date: Sun, 19 May 2024 20:10:39 +0200 Message-Id: <20240519181039.23147-1-egyszeregy@freemail.hu> X-Mailer: git-send-email 2.39.3 Precedence: bulk X-Mailing-List: linux-spi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=simple/relaxed; t=1716142251; s=20181004; d=freemail.hu; h=From:To:Cc:Subject:Date:MIME-Version:Content-Type:Content-Transfer-Encoding; l=1791; bh=8JjPylgkjJhf1YbO+GZAuXsj5MnBCud61GtXY/XF3T4=; b=0hWgjmKN0EvdCrAMLe2Y9+HtVqwXunqLAWVS2M9JlCZiRskccxZU+gfiN6orFe6f o68HQoT6xFIq9oeHiF4hSfP5Ko8JSWqGubrBVafGe+yobj0OzGl4qb2maEJscZHR+5P ygpReibEUtHHfMvrDDI2jZEFOyOWA5k1A4A3qUX1m5G/CT3cHzK/TS/p7OSsk3k55hI 6HGIPq/GUpUodcoOQyoGfi52vjqj3NK7XYcrawvX3b5mCw3Ve3I64MdZRhAcqoS7I5A F2YB/6U38Ubpm4iucIIVWHU13/IhnEAe/t4TEWKE1JNYAgyBbfIx20jzDDirCq5HXw6 Imc0P0Q3DA== From: Benjamin Szőke Optionally, spidev may have a "linux,spidev-name" property. This is a string which is defining a custom suffix name for spi device in /dev/spidev- format. It helps to improve software portability between various SoCs and reduce complexities of hardware related codes in SWs. Signed-off-by: Benjamin Szőke --- drivers/spi/spidev.c | 19 ++++++++++++++++--- 1 file changed, 16 insertions(+), 3 deletions(-) diff --git a/drivers/spi/spidev.c b/drivers/spi/spidev.c index 95fb5f1c91c1..e0071522fc6d 100644 --- a/drivers/spi/spidev.c +++ b/drivers/spi/spidev.c @@ -767,6 +767,8 @@ MODULE_DEVICE_TABLE(acpi, spidev_acpi_ids); static int spidev_probe(struct spi_device *spi) { + int ret; + const char *name; int (*match)(struct device *dev); struct spidev_data *spidev; int status; @@ -800,9 +802,20 @@ static int spidev_probe(struct spi_device *spi) struct device *dev; spidev->devt = MKDEV(SPIDEV_MAJOR, minor); - dev = device_create(&spidev_class, &spi->dev, spidev->devt, - spidev, "spidev%d.%d", - spi->controller->bus_num, spi_get_chipselect(spi, 0)); + + /* + * If "linux,spidev-name" is specified in device tree, use /dev/spidev- + * in Linux userspace, otherwise use /dev/spidev.. + */ + ret = device_property_read_string(&spi->dev, "linux,spidev-name", &name); + if (ret < 0) + dev = device_create(spidev_class, &spi->dev, spidev->devt, + spidev, "spidev%d.%d", + spi->controller->bus_num, spi_get_chipselect(spi, 0)); + else + dev = device_create(spidev_class, &spi->dev, spidev->devt, + spidev, "spidev-%s", name); + status = PTR_ERR_OR_ZERO(dev); } else { dev_dbg(&spi->dev, "no minor number available!\n");