From patchwork Thu Jan 20 13:43:20 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Binding X-Patchwork-Id: 533786 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 08114C433FE for ; Thu, 20 Jan 2022 13:44:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241939AbiATNov (ORCPT ); Thu, 20 Jan 2022 08:44:51 -0500 Received: from mx0a-001ae601.pphosted.com ([67.231.149.25]:12338 "EHLO mx0b-001ae601.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S244056AbiATNod (ORCPT ); Thu, 20 Jan 2022 08:44:33 -0500 Received: from pps.filterd (m0077473.ppops.net [127.0.0.1]) by mx0a-001ae601.pphosted.com (8.16.1.2/8.16.1.2) with ESMTP id 20K6iPZD000624; Thu, 20 Jan 2022 07:43:43 -0600 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cirrus.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding : content-type; s=PODMain02222019; bh=0TVxBDOiUr12OuPIFyA5/1w1LgYsgtcjV4mdb8rtSok=; b=akgwT+7coenSBKftft8TW/YY7rpIFXUVJxWc+Gf4tZKKoVMaa5cZJIuq4Sq+htg4q3wS UktzsC0h0kkmFLVHVSXPTdek5cFTY+kX6p7WdfKmVZaxj1BD3GyzTXDEDIJY6FPrMrrU u/Z+LmbieGBLYrG/kFhKTbQQbFn8qRMG3f8H+c8bCQbvgkxyRhLvEJQy/EEbgdFZ3Bhx +Cto5gtPL9c1SGKMS6sfqwPxnCY0gZO/+cQPT4+g8kqoZNzIRNjxIcd1HUDhJf2DYHt3 q1ght/njafIhL2VV9AiP4qGtfA+AMFRQoWaWrTvAbk/yKu2EehmXyhfAkqNQN9bc3j5q 5g== Received: from ediex01.ad.cirrus.com ([84.19.233.68]) by mx0a-001ae601.pphosted.com (PPS) with ESMTPS id 3dpms0h5y2-2 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT); Thu, 20 Jan 2022 07:43:43 -0600 Received: from EDIEX01.ad.cirrus.com (198.61.84.80) by EDIEX01.ad.cirrus.com (198.61.84.80) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.18; Thu, 20 Jan 2022 13:43:41 +0000 Received: from ediswmail.ad.cirrus.com (198.61.86.93) by EDIEX01.ad.cirrus.com (198.61.84.80) with Microsoft SMTP Server id 15.1.2375.18 via Frontend Transport; Thu, 20 Jan 2022 13:43:41 +0000 Received: from LONN2DGDQ73.ad.cirrus.com (unknown [198.90.238.138]) by ediswmail.ad.cirrus.com (Postfix) with ESMTP id D838B46D; Thu, 20 Jan 2022 13:43:40 +0000 (UTC) From: Stefan Binding To: Mark Brown , "Rafael J . Wysocki" , Len Brown , Hans de Goede , Mark Gross , Jaroslav Kysela , Takashi Iwai CC: , , , , , , Stefan Binding Subject: [PATCH v4 3/9] spi: Support selection of the index of the ACPI Spi Resource before alloc Date: Thu, 20 Jan 2022 13:43:20 +0000 Message-ID: <20220120134326.5295-4-sbinding@opensource.cirrus.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220120134326.5295-1-sbinding@opensource.cirrus.com> References: <20220120134326.5295-1-sbinding@opensource.cirrus.com> MIME-Version: 1.0 X-Proofpoint-ORIG-GUID: lVY58-c6Ojw24lHzPaZRFRh5dD4MiGLK X-Proofpoint-GUID: lVY58-c6Ojw24lHzPaZRFRh5dD4MiGLK X-Proofpoint-Spam-Reason: safe Precedence: bulk List-ID: X-Mailing-List: linux-spi@vger.kernel.org If a node contains more than one Spi Resources, it may be necessary to use an index to select which one you want to allocate a spi device for. Signed-off-by: Stefan Binding --- drivers/spi/spi.c | 56 +++++++++++++++++++++++++++++++++++------ include/linux/spi/spi.h | 6 +++-- 2 files changed, 52 insertions(+), 10 deletions(-) diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c index 13f4701f0694..898cc9931490 100644 --- a/drivers/spi/spi.c +++ b/drivers/spi/spi.c @@ -2320,6 +2320,9 @@ struct acpi_spi_lookup { int irq; u8 bits_per_word; u8 chip_select; + int n; + int index; + int irq_index; }; static void acpi_spi_parse_apple_properties(struct acpi_device *dev, @@ -2351,6 +2354,8 @@ static void acpi_spi_parse_apple_properties(struct acpi_device *dev, lookup->mode |= SPI_CPHA; } +static struct spi_controller *acpi_spi_find_controller_by_adev(struct acpi_device *adev); + static int acpi_spi_add_resource(struct acpi_resource *ares, void *data) { struct acpi_spi_lookup *lookup = data; @@ -2364,14 +2369,35 @@ static int acpi_spi_add_resource(struct acpi_resource *ares, void *data) sb = &ares->data.spi_serial_bus; if (sb->type == ACPI_RESOURCE_SERIAL_TYPE_SPI) { + if (lookup->index != -1 && lookup->n++ != lookup->index) + return 1; + + if (lookup->index == -1 && !ctlr) + return -ENODEV; + status = acpi_get_handle(NULL, sb->resource_source.string_ptr, &parent_handle); - if (ACPI_FAILURE(status) || - ACPI_HANDLE(ctlr->dev.parent) != parent_handle) + if (ACPI_FAILURE(status)) return -ENODEV; + if (ctlr) { + if (ACPI_HANDLE(ctlr->dev.parent) != parent_handle) + return -ENODEV; + } else { + struct acpi_device *adev; + + if (acpi_bus_get_device(parent_handle, &adev)) + return -ENODEV; + + ctlr = acpi_spi_find_controller_by_adev(adev); + if (!ctlr) + return -ENODEV; + + lookup->ctlr = ctlr; + } + /* * ACPI DeviceSelection numbering is handled by the * host controller driver in Windows and can vary @@ -2402,7 +2428,7 @@ static int acpi_spi_add_resource(struct acpi_resource *ares, void *data) } else if (lookup->irq < 0) { struct resource r; - if (acpi_dev_resource_interrupt(ares, 0, &r)) + if (acpi_dev_resource_interrupt(ares, lookup->irq_index, &r)) lookup->irq = r.start; } @@ -2414,14 +2440,22 @@ static int acpi_spi_add_resource(struct acpi_resource *ares, void *data) * acpi_spi_device_alloc - Allocate a spi device, and fill it in with ACPI information * @ctlr: controller to which the spi device belongs * @adev: ACPI Device for the spi device + * @index: Index of the spi resource inside the ACPI Node + * @irq_index: Index of the GPIO resource for the IRQ inside the ACPI Node * * This should be used to allocate a new spi device from and ACPI Node. * The caller is responsible for calling spi_add_device to register the spi device. * + * If ctlr is set to NULL, the Controller for the spi device will be looked up + * using the resource. + * If index is set to -1, index is not used. + * Note: If index is -1, ctlr must be set. + * * Return: a pointer to the new device, or ERR_PTR on error. */ struct spi_device *acpi_spi_device_alloc(struct spi_controller *ctlr, - struct acpi_device *adev) + struct acpi_device *adev, + int index, int irq_index) { acpi_handle parent_handle = NULL; struct list_head resource_list; @@ -2429,8 +2463,14 @@ struct spi_device *acpi_spi_device_alloc(struct spi_controller *ctlr, struct spi_device *spi; int ret; + if (!ctlr && index == -1) + return ERR_PTR(-EINVAL); + lookup.ctlr = ctlr; lookup.irq = -1; + lookup.index = index; + lookup.n = 0; + lookup.irq_index = irq_index; INIT_LIST_HEAD(&resource_list); ret = acpi_dev_get_resources(adev, &resource_list, @@ -2443,7 +2483,7 @@ struct spi_device *acpi_spi_device_alloc(struct spi_controller *ctlr, if (!lookup.max_speed_hz && ACPI_SUCCESS(acpi_get_parent(adev->handle, &parent_handle)) && - ACPI_HANDLE(ctlr->dev.parent) == parent_handle) { + ACPI_HANDLE(lookup.ctlr->dev.parent) == parent_handle) { /* Apple does not use _CRS but nested devices for SPI slaves */ acpi_spi_parse_apple_properties(adev, &lookup); } @@ -2451,9 +2491,9 @@ struct spi_device *acpi_spi_device_alloc(struct spi_controller *ctlr, if (!lookup.max_speed_hz) return ERR_PTR(-ENODEV); - spi = spi_alloc_device(ctlr); + spi = spi_alloc_device(lookup.ctlr); if (!spi) { - dev_err(&ctlr->dev, "failed to allocate SPI device for %s\n", + dev_err(&lookup.ctlr->dev, "failed to allocate SPI device for %s\n", dev_name(&adev->dev)); return ERR_PTR(-ENOMEM); } @@ -2478,7 +2518,7 @@ static acpi_status acpi_register_spi_device(struct spi_controller *ctlr, acpi_device_enumerated(adev)) return AE_OK; - spi = acpi_spi_device_alloc(ctlr, adev); + spi = acpi_spi_device_alloc(ctlr, adev, -1, 0); if (IS_ERR(spi)) { if (PTR_ERR(spi) == -ENOMEM) return AE_NO_MEMORY; diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h index 200725692b93..1a34fd0f6ca2 100644 --- a/include/linux/spi/spi.h +++ b/include/linux/spi/spi.h @@ -762,10 +762,12 @@ extern void spi_unregister_controller(struct spi_controller *ctlr); #if IS_ENABLED(CONFIG_ACPI) extern struct spi_device *acpi_spi_device_alloc(struct spi_controller *ctlr, - struct acpi_device *adev); + struct acpi_device *adev, + int index, int irq_index); #else static inline struct spi_device *acpi_spi_device_alloc(struct spi_controller *ctlr, - struct acpi_device *adev); + struct acpi_device *adev, + int index, int irq_index); { return ERR_PTR(-EOPNOTSUPP); }