From patchwork Fri Nov 18 18:51:02 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Michael Walle X-Patchwork-Id: 13048617 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 CB0C2C4332F for ; Fri, 18 Nov 2022 18:54:45 +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=4bjsw7VIhhhSqSrUlFK++THGOyeDijwvQ7R/KNzSotg=; b=ItfOSdd8FTrV5a wQj3zMzM/28DckDYRyZ6zY0ZVdqzdOO8MvSAeSeysJDT8lJrynhUrbxDr/ftCF/UbYqtuJF/Lr/nx BGC0HqeB6OU2MNvq7TmJpc+PzavLcMqjyjYiiHMD00LNo4tbuEWcgBQ1j4tKD4UACAcuwU2MeUSHJ Tt1CcQsvf3OjRrDt1g5MJkd5jTcn3lxgNitegao0aSd+QugjTpZ7rO1JygGuBURLia1/n4hI8Yhxf 5T1OZ0Pcq1QvQNoh4diZtMSD3gVrw/2f31pjgIEDMk2/D/S2McgswRQCTAoJC4Q4nN6CT3LFFRLV6 kkiN9NJ4JtV5YcgJ1iZw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1ow6Ue-007Kie-Qq; Fri, 18 Nov 2022 18:53:41 +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 1ow6Sa-007JOr-FF for linux-arm-kernel@lists.infradead.org; Fri, 18 Nov 2022 18:51:34 +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 DB33F1D22; Fri, 18 Nov 2022 19:51:25 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=walle.cc; s=mail2022082101; t=1668797486; 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=TYZQqx3XoN1piuuchQJLRbu1PADyIK7JzT+JIEDV9Qo=; b=QXLWyu91h+ZxhesLiJurQM0/OyuI7oZV9poD4Z/cobOtliH4y+CjIOX1Fok2hXQHB6v0Wf AOGU7Ot7rvhDi9m7qG/NjBwa/immvqt0PEWf/Jp1jhYRgGhME/uXUqPaBS83lor4A7mIdn 3I5rz9f/9PaMRKA4xv5fgLOukKQXkYYdK6FAci0/zlIUjKN/TsxYUbxMMWBDwiLkFoVYTe Nx+k7XJzmHb4mCmnIdSdmRkUuQIHs4nagYV20KKB674+epIv3OyhyE/P1WmEj7KiYGp+vi xwD4+nteO1Z5pHzLW4ww3zHMqecpn2RJvhr4lLehvr1sgnyGvIJSIYlAL5G+Qw== From: Michael Walle To: Jonathan Corbet , Srinivas Kandagatla , Miquel Raynal , Rob Herring , Frank Rowand 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 v3 02/18] of: base: add of_parse_phandle_with_optional_args() Date: Fri, 18 Nov 2022 19:51:02 +0100 Message-Id: <20221118185118.1190044-3-michael@walle.cc> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20221118185118.1190044-1-michael@walle.cc> References: <20221118185118.1190044-1-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-20221118_105132_696200_65F9505F X-CRM114-Status: GOOD ( 15.93 ) 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 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 *