From nobody Tue Apr 7 00:43:18 2026 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 C0C9EECAAD3 for ; Thu, 1 Sep 2022 22:21:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235151AbiIAWVZ (ORCPT ); Thu, 1 Sep 2022 18:21:25 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48080 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235099AbiIAWUo (ORCPT ); Thu, 1 Sep 2022 18:20:44 -0400 Received: from mail.3ffe.de (0001.3ffe.de [IPv6:2a01:4f8:c0c:9d57::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9636272B77; Thu, 1 Sep 2022 15:19:11 -0700 (PDT) Received: from mwalle01.kontron.local. (unknown [213.135.10.150]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mail.3ffe.de (Postfix) with ESMTPSA id B53E82174; Fri, 2 Sep 2022 00:19:08 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=walle.cc; s=mail2022082101; t=1662070748; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=KPTSNnKuOZ7slK5iP2y/D4YlHgeHTfE+RpZ3l5g5oDE=; b=xVw9apIIeycfaSw4xC5V+V9aqeQ+Yhu7JgXVUqFEgGpHNt0DbYiOqB8hQx+rwVIBbseS4d Xv3TdS7ReFq+ZB1fdj+y2qCBF0DQM83gQ+8gZ8kmRZQ/l9ICbqBTm8XCEr0vIl/w24trl/ 2vfBccFYhuNqgWqEOmOVCiXsN9zNWyey4vjN/ju14C4YANPzHhk05uJMSRh+uxLgFTdfXY mQzyWJY61bzFrBiiEMNwiARl0UJs+GMQXNhYX9oLlNqSxxv93+HmO7pP1wlga2VCGiemE8 JBARPRLsKjn5pSrAG1/4uHSrt/86WceOjMa8wmu5BrkTSlcYo3EU2VHv2qu4wA== From: Michael Walle To: Miquel Raynal , Richard Weinberger , Vignesh Raghavendra , Rob Herring , Krzysztof Kozlowski , Srinivas Kandagatla , Shawn Guo , Li Yang , =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= , Frank Rowand Cc: linux-mtd@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Ahmad Fatoum , Philipp Zabel , Michael Walle , Rob Herring Subject: [PATCH v2 02/20] of: base: add of_parse_phandle_with_optional_args() Date: Fri, 2 Sep 2022 00:18:39 +0200 Message-Id: <20220901221857.2600340-3-michael@walle.cc> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220901221857.2600340-1-michael@walle.cc> References: <20220901221857.2600340-1-michael@walle.cc> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Spam: Yes Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Add a new variant of the of_parse_phandle_with_args() which treats the cells name as optional. If it's missing, it is assumed that the phandle has no arguments. Up until now, a nvmem node didn't have any arguments, so all the device trees haven't any '#*-cells' property. But there is a need for an additional argument for the phandle, for which we need a '#*-cells' property. Therefore, we need to support nvmem nodes with and without this property. Signed-off-by: Michael Walle Reviewed-by: Rob Herring --- changes since v1: - none include/linux/of.h | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) diff --git a/include/linux/of.h b/include/linux/of.h index 766d002bddb9..a0fe1a017452 100644 --- a/include/linux/of.h +++ b/include/linux/of.h @@ -1008,6 +1008,31 @@ static inline int of_parse_phandle_with_fixed_args(c= onst struct device_node *np, index, out_args); } =20 +/** + * of_parse_phandle_with_optional_args() - Find a node pointed by phandle = in a list + * @np: pointer to a device tree node containing a list + * @list_name: property name that contains a list + * @cells_name: property name that specifies phandles' arguments count + * @index: index of a phandle to parse out + * @out_args: optional pointer to output arguments structure (will be fill= ed) + * + * Same as of_parse_phandle_with_args() except that if the cells_name prop= erty + * is not found, cell_count of 0 is assumed. + * + * This is used to useful, if you have a phandle which didn't have argumen= ts + * before and thus doesn't have a '#*-cells' property but is now migrated = to + * having arguments while retaining backwards compatibility. + */ +static inline int of_parse_phandle_with_optional_args(const struct device_= node *np, + const char *list_name, + const char *cells_name, + int index, + struct of_phandle_args *out_args) +{ + return __of_parse_phandle_with_args(np, list_name, cells_name, + 0, index, out_args); +} + /** * of_property_count_u8_elems - Count the number of u8 elements in a prope= rty * --=20 2.30.2