From patchwork Tue Feb 7 01:42:01 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Saravana Kannan X-Patchwork-Id: 652578 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 4716EC61DA4 for ; Tue, 7 Feb 2023 01:43:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230319AbjBGBnr (ORCPT ); Mon, 6 Feb 2023 20:43:47 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41886 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230349AbjBGBnD (ORCPT ); Mon, 6 Feb 2023 20:43:03 -0500 Received: from mail-pl1-x649.google.com (mail-pl1-x649.google.com [IPv6:2607:f8b0:4864:20::649]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 217A123660 for ; Mon, 6 Feb 2023 17:42:37 -0800 (PST) Received: by mail-pl1-x649.google.com with SMTP id y8-20020a170902b48800b00192a600df83so7304461plr.15 for ; Mon, 06 Feb 2023 17:42:37 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=cc:to:from:subject:references:mime-version:message-id:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=eHkn7URR+Wxf1z7FIYAyiZv9JLKLhxrUf9FZBGK7iDo=; b=X39XxihNmunqazOTpIkjvNwzLVqnqPsFSYGCONP99rFEEJQTw0YZGZIGdZ2G3+9vBn jLSmp7NH6muan+2mAEaSNl5yTC31b7Q5T/udBdAm9llcuJBX5oUbFtMr82F8YTjvEw2Q doJbf8H77vo5qapVNP6ot4Js78tZNZVyzlWLT3b2iKSUDPPQA+szJzHBSQRLwdPsZQW6 I+1EE/BAl9hm3vZvs+d558fqJuGREAMebpGf7PWMwlbfgiVJvDcr+ymp2N4YVKoNN+NW P1oJl3asALANFBOisjnueYBs1keAmZXsNfAhWIe4VBy5tPGQ8fI9v7pI096EUfbmPWQy vqFA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:from:subject:references:mime-version:message-id:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=eHkn7URR+Wxf1z7FIYAyiZv9JLKLhxrUf9FZBGK7iDo=; b=g/I2JV5Gp/IRtzbI7zkM6wh2DrqR8eBtqfT9U0pdeuINaDtKDT0ZWNNzJjSzYL11rw cMQt6JALVT08SojEdEJnMMeEX4uWmkPB/wEvinAf5NtVYe9kBkLYOK9ahGiRMtgwXERz GO+NYvVyDwBREBAkXbcLOjPv/qOizfAfe59k/KBaKf9iEVs1effR27j/DTlCEg5gTjr1 fP3k4KQ1aCfxXSbJFpyC8dLJseTd4WrwTzidH+qtFwuucOzPYvzywYqX5zTNwOq3AoG3 XEVrU+pltaKhUucwCjDdM5NH6+5ic6MUcPHojweCyYsjrtQFrmuU9Jiq6Y5Fmy9YO2pE jKpw== X-Gm-Message-State: AO0yUKWnv3foKPyS+kjsPJiCw5wJj3deisO2DhS3SMmq/eFKMtTM7Dwl wQr4tkYtO2sEM8eisZHN4yNjhWnw1XmcWVk= X-Google-Smtp-Source: AK7set9gap7iVtj70G9Lb/TrrQyg8mWjZcfTC68UXJ/UbN0WLTioSeWRqcHRtuDY/mEnQb4c6/HizBrhqtXfNvE= X-Received: from saravanak.san.corp.google.com ([2620:15c:2d:3:ae1:aba6:f21c:4a94]) (user=saravanak job=sendgmr) by 2002:a17:90b:198c:b0:230:ebc1:3ab3 with SMTP id mv12-20020a17090b198c00b00230ebc13ab3mr146048pjb.104.1675734154917; Mon, 06 Feb 2023 17:42:34 -0800 (PST) Date: Mon, 6 Feb 2023 17:42:01 -0800 In-Reply-To: <20230207014207.1678715-1-saravanak@google.com> Message-Id: <20230207014207.1678715-10-saravanak@google.com> Mime-Version: 1.0 References: <20230207014207.1678715-1-saravanak@google.com> X-Mailer: git-send-email 2.39.1.519.gcb327c4b5f-goog Subject: [PATCH v3 09/12] of: property: Simplify of_link_to_phandle() From: Saravana Kannan To: Greg Kroah-Hartman , "Rafael J. Wysocki" , Sudeep Holla , Cristian Marussi , Linus Walleij , Bartosz Golaszewski , Thomas Gleixner , Marc Zyngier , Shawn Guo , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam , NXP Linux Team , Miquel Raynal , Richard Weinberger , Vignesh Raghavendra , Rob Herring , Frank Rowand , Geert Uytterhoeven , Magnus Damm , Andy Shevchenko , Daniel Scally , Heikki Krogerus , Sakari Ailus , Len Brown , Saravana Kannan , " =?utf-8?b?UmFmYcWCIE1pxYJlY2tp?= " Cc: Abel Vesa , Alexander Stein , Tony Lindgren , Geert Uytterhoeven , John Stultz , Doug Anderson , Guenter Roeck , Dmitry Baryshkov , Maxim Kiselev , Maxim Kochetkov , Luca Weiss , Colin Foster , Martin Kepplinger , Jean-Philippe Brucker , Vladimir Oltean , kernel-team@android.com, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-gpio@vger.kernel.org, linux-mtd@lists.infradead.org, devicetree@vger.kernel.org, linux-renesas-soc@vger.kernel.org, linux-acpi@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org The driver core now: - Has the parent device of a supplier pick up the consumers if the supplier never has a device created for it. - Ignores a supplier if the supplier has no parent device and will never be probed by a driver And already prevents creating a device link with the consumer as a supplier of a parent. So, we no longer need to find the "compatible" node of the supplier or do any other checks in of_link_to_phandle(). We simply need to make sure that the supplier is available in DT. Signed-off-by: Saravana Kannan Tested-by: Colin Foster Tested-by: Sudeep Holla --- drivers/of/property.c | 84 +++++++------------------------------------ 1 file changed, 13 insertions(+), 71 deletions(-) diff --git a/drivers/of/property.c b/drivers/of/property.c index 134cfc980b70..c651aad6f34b 100644 --- a/drivers/of/property.c +++ b/drivers/of/property.c @@ -1062,20 +1062,6 @@ of_fwnode_device_get_match_data(const struct fwnode_handle *fwnode, return of_device_get_match_data(dev); } -static bool of_is_ancestor_of(struct device_node *test_ancestor, - struct device_node *child) -{ - of_node_get(child); - while (child) { - if (child == test_ancestor) { - of_node_put(child); - return true; - } - child = of_get_next_parent(child); - } - return false; -} - static struct device_node *of_get_compat_node(struct device_node *np) { of_node_get(np); @@ -1106,71 +1092,27 @@ static struct device_node *of_get_compat_node_parent(struct device_node *np) return node; } -/** - * of_link_to_phandle - Add fwnode link to supplier from supplier phandle - * @con_np: consumer device tree node - * @sup_np: supplier device tree node - * - * Given a phandle to a supplier device tree node (@sup_np), this function - * finds the device that owns the supplier device tree node and creates a - * device link from @dev consumer device to the supplier device. This function - * doesn't create device links for invalid scenarios such as trying to create a - * link with a parent device as the consumer of its child device. In such - * cases, it returns an error. - * - * Returns: - * - 0 if fwnode link successfully created to supplier - * - -EINVAL if the supplier link is invalid and should not be created - * - -ENODEV if struct device will never be create for supplier - */ -static int of_link_to_phandle(struct device_node *con_np, +static void of_link_to_phandle(struct device_node *con_np, struct device_node *sup_np) { - struct device *sup_dev; - struct device_node *tmp_np = sup_np; + struct device_node *tmp_np = of_node_get(sup_np); - /* - * Find the device node that contains the supplier phandle. It may be - * @sup_np or it may be an ancestor of @sup_np. - */ - sup_np = of_get_compat_node(sup_np); - if (!sup_np) { - pr_debug("Not linking %pOFP to %pOFP - No device\n", - con_np, tmp_np); - return -ENODEV; - } + /* Check that sup_np and its ancestors are available. */ + while (tmp_np) { + if (of_fwnode_handle(tmp_np)->dev) { + of_node_put(tmp_np); + break; + } - /* - * Don't allow linking a device node as a consumer of one of its - * descendant nodes. By definition, a child node can't be a functional - * dependency for the parent node. - */ - if (of_is_ancestor_of(con_np, sup_np)) { - pr_debug("Not linking %pOFP to %pOFP - is descendant\n", - con_np, sup_np); - of_node_put(sup_np); - return -EINVAL; - } + if (!of_device_is_available(tmp_np)) { + of_node_put(tmp_np); + return; + } - /* - * Don't create links to "early devices" that won't have struct devices - * created for them. - */ - sup_dev = get_dev_from_fwnode(&sup_np->fwnode); - if (!sup_dev && - (of_node_check_flag(sup_np, OF_POPULATED) || - sup_np->fwnode.flags & FWNODE_FLAG_NOT_DEVICE)) { - pr_debug("Not linking %pOFP to %pOFP - No struct device\n", - con_np, sup_np); - of_node_put(sup_np); - return -ENODEV; + tmp_np = of_get_next_parent(tmp_np); } - put_device(sup_dev); fwnode_link_add(of_fwnode_handle(con_np), of_fwnode_handle(sup_np)); - of_node_put(sup_np); - - return 0; } /**