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(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 B779D7F2F; Thu, 25 Aug 2022 23:44:36 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=walle.cc; s=mail2022082101; t=1661463877; 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=CmcHupI3mIbSe+IgK2Ws1BvvkDFNVQM1m+LZLWbNFnw=; b=BNSJKr2FuITRBJeIaRpiDsHPg+a3EQLU/2iA0my5HhI4JmThIC0kK6rQPATo0pL7Q4eEcH LjUz0dhNZgSJW3WuHOjYFIM2kL4/QbvUpWfLKwEo0nTOy8/Cft6mBv98NMo6qL/RWgPlo3 A4uQ3EJCk2nRejzSa0W3u1IY43kyfPObPxXu9tr3ZrfICvmjabfbPSsgJ0tIxjJY2GFGYE k8tKKfVvZtYH+Nw2Q4f/JWGXCB791/+1X/+YJDFURGn7axpJPdEAtNs7B2kZT7yxLjoA+i bYPQAQo7590N+my84L+ymvOoWT1CqWtuepDIeu+R8/SdnSjfFmL+12yW5n0lmQ== 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?= , "David S . Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Frank Rowand Cc: linux-mtd@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, netdev@vger.kernel.org, Ahmad Fatoum , Michael Walle , Rob Herring Subject: [PATCH v1 02/14] of: base: add of_parse_phandle_with_optional_args() Date: Thu, 25 Aug 2022 23:44:11 +0200 Message-Id: <20220825214423.903672-3-michael@walle.cc> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220825214423.903672-1-michael@walle.cc> References: <20220825214423.903672-1-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-20220825_144440_740858_D2CC200F X-CRM114-Status: GOOD ( 14.16 ) 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: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit 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 --- 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(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 * -- 2.30.2 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel