From patchwork Tue Dec 28 14:25:42 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Michael Walle X-Patchwork-Id: 12700382 X-Patchwork-Delegate: kuba@kernel.org 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 9C198C43217 for ; Tue, 28 Dec 2021 14:26:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233801AbhL1O0V (ORCPT ); Tue, 28 Dec 2021 09:26:21 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55368 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233692AbhL1O0T (ORCPT ); Tue, 28 Dec 2021 09:26:19 -0500 Received: from ssl.serverraum.org (ssl.serverraum.org [IPv6:2a01:4f8:151:8464::1:2]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4D3C6C061574; Tue, 28 Dec 2021 06:26:17 -0800 (PST) Received: from mwalle01.kontron.local. (unknown [IPv6:2a02:810b:4340:43bf:fa59:71ff:fe9b:b851]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange ECDHE (P-384) server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by ssl.serverraum.org (Postfix) with ESMTPSA id 6FE7A223EA; Tue, 28 Dec 2021 15:26:14 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=walle.cc; s=mail2016061301; t=1640701574; 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=9V3jjNX+h+SC4H3w7ArRhed6jMoCjU/AbUnBIS3w/EM=; b=LLhbIGksetqq4w9fP6GpIS0VEN7pDz+IZgJ9KsI4qai8ysx1kwMrd4/YF7cwhZYcSSBcrK ZAonKjulneohhOMhH2XUbPNhfnAKdBQ54/RjwWXzwP55OmrwgzpIhYMc//gUFNTSRkaVdC +5oBNdiL6m7B4iMg0FCyoQJm9XV2qIs= From: Michael Walle To: linux-mtd@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, netdev@vger.kernel.org Cc: Miquel Raynal , Richard Weinberger , Vignesh Raghavendra , Rob Herring , Srinivas Kandagatla , Shawn Guo , Li Yang , Frank Rowand , "David S . Miller" , Jakub Kicinski , Ansuel Smith , Andrew Lunn , Michael Walle Subject: [PATCH 1/8] of: base: add of_parse_phandle_with_optional_args() Date: Tue, 28 Dec 2021 15:25:42 +0100 Message-Id: <20211228142549.1275412-2-michael@walle.cc> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20211228142549.1275412-1-michael@walle.cc> References: <20211228142549.1275412-1-michael@walle.cc> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.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 --- drivers/of/base.c | 23 +++++++++++++++++++++++ include/linux/of.h | 12 ++++++++++++ 2 files changed, 35 insertions(+) diff --git a/drivers/of/base.c b/drivers/of/base.c index 5b907600f5b0..fb28bb26276e 100644 --- a/drivers/of/base.c +++ b/drivers/of/base.c @@ -1543,6 +1543,29 @@ int of_parse_phandle_with_args(const struct device_node *np, const char *list_na } EXPORT_SYMBOL(of_parse_phandle_with_args); +/** + * of_parse_phandle_with_optional_args() - Find a node pointed by phandle in a list + * + * Same as of_parse_phandle_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. + */ +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) +{ + if (index < 0) + return -EINVAL; + + return __of_parse_phandle_with_args(np, list_name, cells_name, + 0, index, out_args); +} +EXPORT_SYMBOL(of_parse_phandle_with_optional_args); + /** * of_parse_phandle_with_args_map() - Find a node pointed by phandle in a list and remap it * @np: pointer to a device tree node containing a list diff --git a/include/linux/of.h b/include/linux/of.h index ff143a027abc..ccace453d25f 100644 --- a/include/linux/of.h +++ b/include/linux/of.h @@ -376,6 +376,9 @@ extern int of_parse_phandle_with_args_map(const struct device_node *np, extern int of_parse_phandle_with_fixed_args(const struct device_node *np, const char *list_name, int cells_count, int index, struct of_phandle_args *out_args); +extern 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); extern int of_count_phandle_with_args(const struct device_node *np, const char *list_name, const char *cells_name); @@ -897,6 +900,15 @@ static inline int of_parse_phandle_with_fixed_args(const struct device_node *np, return -ENOSYS; } +static inline int of_parse_phandle_with_optional_args(const struct device_node *np, + char *list_name, + int cells_count, + int index, + struct of_phandle_args *out_args) +{ + return -ENOSYS; +} + static inline int of_count_phandle_with_args(const struct device_node *np, const char *list_name, const char *cells_name)