From patchwork Wed Nov 23 18:01:33 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Michael Walle X-Patchwork-Id: 13054073 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 18A95C433FE for ; Wed, 23 Nov 2022 18:03:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=DSvTms5JzZtnTCEX9kYZuO+/f5bocPaur5fpr9lEu50=; b=QfOtm6mrJcAlCw dUrGdeaWWBi9k8JvlQKide7exoFVOuuU3lRjsXBpfrcuya4HmFLn5xzpBwCayBSKFbeJRGuuoxfmY kYDsikEG3EM/IlIX44BGO+sC8txu5dKFL0OLBdLUhR4OD4KWU8X93TL5/x0k3gBEmWaoQumzc08Ze HowSASpjV4v50p4jOlY2ER5NJLAQGGZhOI1d9x6nrjcag3SzlcyeWbHEaLpb6npKzzpTboOKVj2ye DM6iPxfLf/mvCcn8p2nh/95PTWYdT0uKkXXh/3GDFR1lfjVPT77c6L0Ak1k4bliMnTBVEEYudX5Vt aDk9rI/mYmMOxSVSQdoQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1oxu4y-001OP4-D8; Wed, 23 Nov 2022 18:02:36 +0000 Received: from 0001.3ffe.de ([159.69.201.130] helo=mail.3ffe.de) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1oxu4k-001OFk-Gp for linux-arm-kernel@lists.infradead.org; Wed, 23 Nov 2022 18:02:24 +0000 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 23F7927BF; Wed, 23 Nov 2022 19:02:19 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=walle.cc; s=mail2022082101; t=1669226539; 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=6/o1ZODrnXgixeRc40M5DiB6qZMv+p5qkZBjlK/B2Jo=; b=XkpNhRW6GPSZcUMEQAclXA8ulS7pIcJhe4QcBvaZQWhN/eTsw8xVRx02TqAqYdDUIrgXlx hcC1/44PtAw0iD/Iq0+fk6mrk4kO0QKlnaRtm/3JfM26ntp2UMyo95/8Mk/hzdegdpKv+L LD/3De6Sx3swD0vWOQsfnDtd5aAJx5LmWJ7q9BFnfBPwe+2RC8JTmBj5YHXNZX6YvyMYrz hzZ9CWqFcS9xSBA/HBsGZCQDoGOdsMcEWZ3tiQ+BwW3HGDAUvG54+yrCNosn3nnSVx8Skq roLYh3rML5odQoPI96zxLVlksDdybaPmAXWx52FkTZBIGAaoiDu3mJJXwMidxA== From: Michael Walle To: Jonathan Corbet , Srinivas Kandagatla , Miquel Raynal , Rob Herring , Frank Rowand , Sascha Hauer Cc: linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, Michael Walle , Rob Herring Subject: [PATCH v4 02/20] of: base: add of_parse_phandle_with_optional_args() Date: Wed, 23 Nov 2022 19:01:33 +0100 Message-Id: <20221123180151.2160033-3-michael@walle.cc> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20221123180151.2160033-1-michael@walle.cc> References: <20221123180151.2160033-1-michael@walle.cc> MIME-Version: 1.0 X-Spam: Yes X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20221123_100222_810354_A265AEE7 X-CRM114-Status: GOOD ( 16.43 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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 v3: - none changes since v2: - none 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 8b9f94386dc3..98c252d2d851 100644 --- a/include/linux/of.h +++ b/include/linux/of.h @@ -1008,6 +1008,31 @@ static inline int of_parse_phandle_with_fixed_args(const struct device_node *np, index, out_args); } +/** + * 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 filled) + * + * Same as of_parse_phandle_with_args() except that if the cells_name property + * is not found, cell_count of 0 is assumed. + * + * This is used to useful, if you have a phandle which didn't have arguments + * 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 property *