From patchwork Thu Mar 3 22:33:46 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bjorn Andersson X-Patchwork-Id: 12768199 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 700FDC43217 for ; Thu, 3 Mar 2022 22:32:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236943AbiCCWcv (ORCPT ); Thu, 3 Mar 2022 17:32:51 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53694 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233062AbiCCWcs (ORCPT ); Thu, 3 Mar 2022 17:32:48 -0500 Received: from mail-oo1-xc34.google.com (mail-oo1-xc34.google.com [IPv6:2607:f8b0:4864:20::c34]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EF165135737 for ; Thu, 3 Mar 2022 14:32:01 -0800 (PST) Received: by mail-oo1-xc34.google.com with SMTP id i6-20020a4ac506000000b0031c5ac6c078so7432983ooq.6 for ; Thu, 03 Mar 2022 14:32:01 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=GXj+JJPwfsy1TPTyievdzxMaMQ1HgahsIy1fHCecuJ8=; b=s5oo+ymjcJWqfAiP1BwjR3idcGDdOwaFb2X8H+Z/c3G5sY1UtDiv3Fv7vjncR7nFMO wA8UYS+eLiiZUeb9Rrgal3IJ+vrQnXJmt3tiaP67Qu+bpO+I1pKc9eYWPE82v9mAuy0a zf0JzaDYQVuA41giUxuz7reKLPok3cCf431Pr/tlhu8wiiki7ajXlfmw9DWYkqIP9KPA MexWfe2ty+nGrQ/qkN0EQ00ztZard0NnaFwi6x9CO5pb5xycrzQoIxbN5A4zHkhBQrm+ vSeWTJEqXUe38QHMrC0SrFuUr9O+0Ik1aqwc8yImJ4BdGByk5nVux5cKyLQ/gTzC2JRh J2Fw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=GXj+JJPwfsy1TPTyievdzxMaMQ1HgahsIy1fHCecuJ8=; b=KqvAuma8UsmjMzXUkl47mpHzRCUhaaBleoTGyquhKMTnv08CO9HbavSA6Lpd/Nuw8/ +Z+yZDTMsXsFOcZkFZ9PhkQt4HwWMyQwIyDYbbR/mGXJxqfDd2qSY+x15cqSpKs9/sgd tlDCevteOAXcrOP0FHCidC61quSWQAzYK0njN4T1uC8+CbUpVjzSgmwzhzREL2cS4Xwr 01N1iZ4k2ETr5AHdLnscWct1yaRR+RWnWrSEu2l5qC5JIoVKB2b0seVmff/P9Vez4nD4 B3rnKqu5E/TrQe8PkGZ3tPhTP8pdWd0oePScoJcjTiHo1KYSNQwc3h75WOZ8X3cLJccr 53RQ== X-Gm-Message-State: AOAM532XtOynjznhsUA6WZiEubVl/mtONjlFms/58/4lQKw2AgMKFtJz X7VXwopG0asrSwFj8v5zOqexcw== X-Google-Smtp-Source: ABdhPJzkhWKivVU8Vch0wuh08xQA/XMkkCLJf277FgVKCZMd2uuRFKuuha1IbHcDRlai/7h6StF3NQ== X-Received: by 2002:a4a:d21b:0:b0:2e2:113:db90 with SMTP id c27-20020a4ad21b000000b002e20113db90mr19603967oos.50.1646346721308; Thu, 03 Mar 2022 14:32:01 -0800 (PST) Received: from ripper.. ([2600:1700:a0:3dc8:205:1bff:fec0:b9b3]) by smtp.gmail.com with ESMTPSA id fq14-20020a0568710b0e00b000d4492531a2sm1764777oab.17.2022.03.03.14.32.00 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 03 Mar 2022 14:32:00 -0800 (PST) From: Bjorn Andersson To: Rob Herring , Andy Shevchenko , Daniel Scally , Heikki Krogerus , Sakari Ailus , "Rafael J. Wysocki" , Hans de Goede Cc: linux-usb@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org, Dmitry Baryshkov Subject: [PATCH v3 1/6] device property: Helper to match multiple connections Date: Thu, 3 Mar 2022 14:33:46 -0800 Message-Id: <20220303223351.141238-1-bjorn.andersson@linaro.org> X-Mailer: git-send-email 2.33.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org In some cases multiple connections with the same connection id needs to be resolved from a fwnode graph. One such example is when separate hardware is used for performing muxing and/or orientation switching of the SuperSpeed and SBU lines in a USB Type-C connector. In this case the connector needs to belong to a graph with multiple matching remote endpoints, and the Type-C controller needs to be able to resolve them both. Add a new API that allows this kind of lookup. Signed-off-by: Bjorn Andersson --- Changes since v2: - Allow the caller of the new api to pass a matches of NULL, to count possible matches. I previously argued that this will cause memory leaks, but Andy pointed out that this depends on the caller and the match function. - Fixed spelling mistakes in commit message and kernel-doc. - Use two "count" variables to make the math clearer. Changes since v1: - Iterator in fwnode_devcon_matches() is now unsigned. - fwnode_handle_put() node for unavailable nodes. - Extended commit message on the subject of supporting dynamically sized "matches" array. drivers/base/property.c | 107 +++++++++++++++++++++++++++++++++++++++ include/linux/property.h | 5 ++ 2 files changed, 112 insertions(+) diff --git a/drivers/base/property.c b/drivers/base/property.c index c0e94cce9c29..5cda205136f6 100644 --- a/drivers/base/property.c +++ b/drivers/base/property.c @@ -1218,6 +1218,40 @@ fwnode_graph_devcon_match(struct fwnode_handle *fwnode, const char *con_id, return NULL; } +static unsigned int fwnode_graph_devcon_matches(struct fwnode_handle *fwnode, + const char *con_id, void *data, + devcon_match_fn_t match, + void **matches, + unsigned int matches_len) +{ + struct fwnode_handle *node; + struct fwnode_handle *ep; + unsigned int count = 0; + void *ret; + + fwnode_graph_for_each_endpoint(fwnode, ep) { + if (count >= matches_len && matches) { + fwnode_handle_put(ep); + return count; + } + + node = fwnode_graph_get_remote_port_parent(ep); + if (!fwnode_device_is_available(node)) { + fwnode_handle_put(node); + continue; + } + + ret = match(node, con_id, data); + fwnode_handle_put(node); + if (ret) { + if (matches) + matches[count] = ret; + count++; + } + } + return count; +} + static void * fwnode_devcon_match(struct fwnode_handle *fwnode, const char *con_id, void *data, devcon_match_fn_t match) @@ -1240,6 +1274,37 @@ fwnode_devcon_match(struct fwnode_handle *fwnode, const char *con_id, return NULL; } +static unsigned int fwnode_devcon_matches(struct fwnode_handle *fwnode, + const char *con_id, void *data, + devcon_match_fn_t match, + void **matches, + unsigned int matches_len) +{ + struct fwnode_handle *node; + unsigned int count = 0; + unsigned int i; + void *ret; + + for (i = 0; ; i++) { + if (count >= matches_len && matches) + return count; + + node = fwnode_find_reference(fwnode, con_id, i); + if (IS_ERR(node)) + break; + + ret = match(node, NULL, data); + fwnode_handle_put(node); + if (ret) { + if (matches) + matches[count] = ret; + count++; + } + } + + return count; +} + /** * fwnode_connection_find_match - Find connection from a device node * @fwnode: Device node with the connection @@ -1267,3 +1332,45 @@ void *fwnode_connection_find_match(struct fwnode_handle *fwnode, return fwnode_devcon_match(fwnode, con_id, data, match); } EXPORT_SYMBOL_GPL(fwnode_connection_find_match); + +/** + * fwnode_connection_find_matches - Find connections from a device node + * @fwnode: Device node with the connection + * @con_id: Identifier for the connection + * @data: Data for the match function + * @match: Function to check and convert the connection description + * @matches: Array of pointers to fill with matches + * @matches_len: Length of @matches + * + * Find up to @matches_len connections with unique identifier @con_id between + * @fwnode and other device nodes. @match will be used to convert the + * connection description to data the caller is expecting to be returned + * through the @matches array. + * If @matches is NULL @matches_len is ignored and the total number of resolved + * matches is returned. + * + * Return: Number of matches resolved, or negative errno. + */ +int fwnode_connection_find_matches(struct fwnode_handle *fwnode, + const char *con_id, void *data, + devcon_match_fn_t match, + void **matches, unsigned int matches_len) +{ + unsigned int count_graph; + unsigned int count_ref; + + if (!fwnode || !match) + return -EINVAL; + + count_graph = fwnode_graph_devcon_matches(fwnode, con_id, data, match, + matches, matches_len); + + matches += count_graph; + matches_len -= count_graph; + + count_ref = fwnode_devcon_matches(fwnode, con_id, data, match, + matches, matches_len); + + return count_graph + count_ref; +} +EXPORT_SYMBOL_GPL(fwnode_connection_find_matches); diff --git a/include/linux/property.h b/include/linux/property.h index 4cd4b326941f..de7ff336d2c8 100644 --- a/include/linux/property.h +++ b/include/linux/property.h @@ -447,6 +447,11 @@ static inline void *device_connection_find_match(struct device *dev, return fwnode_connection_find_match(dev_fwnode(dev), con_id, data, match); } +int fwnode_connection_find_matches(struct fwnode_handle *fwnode, + const char *con_id, void *data, + devcon_match_fn_t match, + void **matches, unsigned int matches_len); + /* -------------------------------------------------------------------------- */ /* Software fwnode support - when HW description is incomplete or missing */