From patchwork Fri Jan 21 14:32:49 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Binding X-Patchwork-Id: 12719822 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 18F51C433EF for ; Fri, 21 Jan 2022 14:33:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1381206AbiAUOd0 (ORCPT ); Fri, 21 Jan 2022 09:33:26 -0500 Received: from mx0a-001ae601.pphosted.com ([67.231.149.25]:19104 "EHLO mx0b-001ae601.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1381161AbiAUOdV (ORCPT ); Fri, 21 Jan 2022 09:33:21 -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 20LDS7PI017315; Fri, 21 Jan 2022 08:33:00 -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=hpkiyedjwFNaW1dW6W1BZYk7mgOTqs24UOHKVbPt4Kk=; b=fjgCUiYkw07idAqoePK+Rxkanygu53psuOsxQeMI1+N6Wk8iy67gLNaXD7Nkkrwy0F+T WVXcWi7edj63AyraCraWQ07zs9Yzy5yZW7s6TFbZyshlERnrm2lO0ynq22nJsJ9xVUjN 0WHyN7QQycyboN+mEY9VsQmOQQIM8w9dv/ZjyEpdpWHfPFCUg4P7d+I37TRGB20vtlwz W9T+QuhB2Ks3SzkA0eiCTVo9QQSfj6XEe4IIGfPKM94Qr2ZFcYF31Y8a8hu1BzfyX6VP O/9o7hW8yfcC+Z1QNgMKc7Ha9ExBow3694O1vwFhUgws4/KWwooDT5wfj0a3Lm+rmTFD gg== Received: from ediex02.ad.cirrus.com ([84.19.233.68]) by mx0a-001ae601.pphosted.com (PPS) with ESMTPS id 3dqhyq0up1-4 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT); Fri, 21 Jan 2022 08:32:59 -0600 Received: from EDIEX01.ad.cirrus.com (198.61.84.80) by EDIEX02.ad.cirrus.com (198.61.84.81) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.18; Fri, 21 Jan 2022 14:32:58 +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; Fri, 21 Jan 2022 14:32:58 +0000 Received: from LONN2DGDQ73.ad.cirrus.com (unknown [198.90.238.138]) by ediswmail.ad.cirrus.com (Postfix) with ESMTP id 91E1DB0E; Fri, 21 Jan 2022 14:32:57 +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 v5 4/9] spi: Add API to count spi acpi resources Date: Fri, 21 Jan 2022 14:32:49 +0000 Message-ID: <20220121143254.6432-5-sbinding@opensource.cirrus.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220121143254.6432-1-sbinding@opensource.cirrus.com> References: <20220121143254.6432-1-sbinding@opensource.cirrus.com> MIME-Version: 1.0 X-Proofpoint-GUID: YXs0xOKaxUze4Bglh0tWMW4u0kkZMcxt X-Proofpoint-ORIG-GUID: YXs0xOKaxUze4Bglh0tWMW4u0kkZMcxt X-Proofpoint-Spam-Reason: safe Precedence: bulk List-ID: X-Mailing-List: linux-spi@vger.kernel.org Some ACPI nodes may have more than one Spi Resource. To be able to handle these case, its necessary to have a way of counting these resources. Signed-off-by: Stefan Binding --- drivers/spi/spi.c | 40 ++++++++++++++++++++++++++++++++++++++++ include/linux/spi/spi.h | 1 + 2 files changed, 41 insertions(+) diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c index 06c0a308b38b..ec9f2ed579e3 100644 --- a/drivers/spi/spi.c +++ b/drivers/spi/spi.c @@ -2324,6 +2324,46 @@ struct acpi_spi_lookup { int index; }; +static int acpi_spi_count(struct acpi_resource *ares, void *data) +{ + struct acpi_resource_spi_serialbus *sb; + int *count = data; + + if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS) + return 1; + + sb = &ares->data.spi_serial_bus; + if (sb->type != ACPI_RESOURCE_SERIAL_TYPE_SPI) + return 1; + + *count = *count + 1; + + return 1; +} + +/** + * acpi_spi_count_resources - Count the number of SpiSerialBus resources + * @adev: ACPI device + * + * Returns the number of SpiSerialBus resources in the ACPI-device's + * resource-list; or a negative error code. + */ +int acpi_spi_count_resources(struct acpi_device *adev) +{ + LIST_HEAD(r); + int count = 0; + int ret; + + ret = acpi_dev_get_resources(adev, &r, acpi_spi_count, &count); + if (ret < 0) + return ret; + + acpi_dev_free_resource_list(&r); + + return count; +} +EXPORT_SYMBOL_GPL(acpi_spi_count_resources); + static void acpi_spi_parse_apple_properties(struct acpi_device *dev, struct acpi_spi_lookup *lookup) { diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h index e5bbb9cbd3d7..394b4241d989 100644 --- a/include/linux/spi/spi.h +++ b/include/linux/spi/spi.h @@ -764,6 +764,7 @@ extern void spi_unregister_controller(struct spi_controller *ctlr); extern struct spi_device *acpi_spi_device_alloc(struct spi_controller *ctlr, struct acpi_device *adev, int index); +int acpi_spi_count_resources(struct acpi_device *adev); #endif /*