From patchwork Mon Mar 1 16:11:09 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 389402 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-18.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 52C7BC433DB for ; Mon, 1 Mar 2021 19:32:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 102E560230 for ; Mon, 1 Mar 2021 19:32:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236439AbhCATb3 (ORCPT ); Mon, 1 Mar 2021 14:31:29 -0500 Received: from mail.kernel.org ([198.145.29.99]:48582 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241395AbhCAT0p (ORCPT ); Mon, 1 Mar 2021 14:26:45 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 91DF565216; Mon, 1 Mar 2021 17:22:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1614619350; bh=thHgAPrqsWcG+qiNvwIweEYk04UdE/CSEAnZ8pvA1R4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=OThkLB6leUfpSosgSwp9RDuCQkt0O1hHC4BZ++3kq+OZX2A3sKrUHpJI7w1XYaOEj JsexY8B5Iy7QKioUbHxR1PkypTGvGujtDqmr7Yu6Ru9qoDXdybnLFZgFCE9sL0cQSk G0WOIYhKVN8sT2XH+9ehP8eypgo9bwekCLtc+BTI= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Ahmad Fatoum , Srinivas Kandagatla , Sasha Levin Subject: [PATCH 5.10 421/663] nvmem: core: skip child nodes not matching binding Date: Mon, 1 Mar 2021 17:11:09 +0100 Message-Id: <20210301161202.705652911@linuxfoundation.org> X-Mailer: git-send-email 2.30.1 In-Reply-To: <20210301161141.760350206@linuxfoundation.org> References: <20210301161141.760350206@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Ahmad Fatoum [ Upstream commit 0445efacec75b85c2a3c176957ee050ba9be53f0 ] The nvmem cell binding applies to all eeprom child nodes matching "^.*@[0-9a-f]+$" without taking a compatible into account. Linux drivers, like at24, are even more extensive and assume _all_ at24 eeprom child nodes to be nvmem cells since e888d445ac33 ("nvmem: resolve cells from DT at registration time"). Since df5f3b6f5357 ("dt-bindings: nvmem: stm32: new property for data access"), the additionalProperties: True means it's Ok to have other properties as long as they don't match "^.*@[0-9a-f]+$". The barebox bootloader extends the MTD partitions binding to EEPROM and can fix up following device tree node: &eeprom { partitions { compatible = "fixed-partitions"; }; }; This is allowed binding-wise, but drivers using nvmem_register() like at24 will fail to parse because the function expects all child nodes to have a reg property present. This results in the whole EEPROM driver probe failing despite the device tree being correct. Fix this by skipping nodes lacking a reg property instead of returning an error. This effectively makes the drivers adhere to the binding because all nodes with a unit address must have a reg property and vice versa. Fixes: e888d445ac33 ("nvmem: resolve cells from DT at registration time"). Signed-off-by: Ahmad Fatoum Signed-off-by: Srinivas Kandagatla Link: https://lore.kernel.org/r/20210129171430.11328-6-srinivas.kandagatla@linaro.org Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin --- drivers/nvmem/core.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c index 1a3460a8e73ab..9b6ab83956c3b 100644 --- a/drivers/nvmem/core.c +++ b/drivers/nvmem/core.c @@ -545,7 +545,9 @@ static int nvmem_add_cells_from_of(struct nvmem_device *nvmem) for_each_child_of_node(parent, child) { addr = of_get_property(child, "reg", &len); - if (!addr || (len < 2 * sizeof(u32))) { + if (!addr) + continue; + if (len < 2 * sizeof(u32)) { dev_err(dev, "nvmem: invalid reg on %pOF\n", child); return -EINVAL; }