From patchwork Wed Mar 23 09:18:04 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?b?Q2zDqW1lbnQgTMOpZ2Vy?= X-Patchwork-Id: 553816 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 8BC60C433FE for ; Wed, 23 Mar 2022 09:20:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S243137AbiCWJV2 (ORCPT ); Wed, 23 Mar 2022 05:21:28 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39556 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S243129AbiCWJV1 (ORCPT ); Wed, 23 Mar 2022 05:21:27 -0400 Received: from relay4-d.mail.gandi.net (relay4-d.mail.gandi.net [217.70.183.196]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3EF8575E7C; Wed, 23 Mar 2022 02:19:56 -0700 (PDT) Received: (Authenticated sender: clement.leger@bootlin.com) by mail.gandi.net (Postfix) with ESMTPSA id 0F449E0004; Wed, 23 Mar 2022 09:19:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1648027194; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=LFZ0Z7uvf0VFG2tUAEpLJUaxBE7qdMjsJkE8V6W3WAM=; b=nOuB63TVx0TmcZXmCmw8aLIxa0FBePow7kE7/h05JJVQV1cUj5mMRYPN5ERsNoj49ARY4f Caj0HnMNN8Js+1JtOG46YgfVYJiIataFu80LNW3P20UtkjS1OdrdztTnc4K/edGT4cety6 3GUXtUkpioPA1SVkvWsStP2/AVj/4Qe4mC+Bz084CYCIWEEhe8exsvi4/Sop8Hyao9cIKk /luXEH2wYZ+8pXzXPLcb6eJeLL+EBC9+LJcSrAJUMwTdc6JBFzWrI0yc4+tHE3yFok+yHd 2MH3w1mb7oeFnPJTepTv9PWz5aeRJhCt0Wt4nywdysAFQoWRIbHpL2olGIbg3w== From: =?utf-8?b?Q2zDqW1lbnQgTMOpZ2Vy?= To: Andy Shevchenko , Daniel Scally , Heikki Krogerus , Sakari Ailus , Greg Kroah-Hartman , "Rafael J . Wysocki" , Wolfram Sang , Peter Rosin , Rob Herring , Frank Rowand , Len Brown Cc: Hans de Goede , Thomas Petazzoni , Alexandre Belloni , Allan Nielsen , linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org, linux-i2c@vger.kernel.org, =?utf-8?b?Q2zDqW1l?= =?utf-8?b?bnQgTMOpZ2Vy?= Subject: [PATCH v2 1/7] device property: add fwnode_property_read_string_index() Date: Wed, 23 Mar 2022 10:18:04 +0100 Message-Id: <20220323091810.329217-2-clement.leger@bootlin.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220323091810.329217-1-clement.leger@bootlin.com> References: <20220323091810.329217-1-clement.leger@bootlin.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-i2c@vger.kernel.org Add fwnode_property_read_string_index() function which allows to retrieve a string from an array by its index. This function is the equivalent of of_property_read_string_index() but for fwnode support. A .property_read_string_index callback is added to fwnode_ops to avoid doing a full allocation of an array just to retrieve one value. Signed-off-by: Clément Léger --- drivers/base/property.c | 26 ++++++++++++++++++++++++++ include/linux/fwnode.h | 6 ++++++ include/linux/property.h | 3 +++ 3 files changed, 35 insertions(+) diff --git a/drivers/base/property.c b/drivers/base/property.c index e6497f6877ee..a8dd6e496a1d 100644 --- a/drivers/base/property.c +++ b/drivers/base/property.c @@ -451,6 +451,32 @@ int fwnode_property_match_string(const struct fwnode_handle *fwnode, } EXPORT_SYMBOL_GPL(fwnode_property_match_string); +/** + * fwnode_property_read_string_index - read a string in an array using an index + * @fwnode: Firmware node to get the property of + * @propname: Name of the property holding the array + * @index: Index of the string to look for + * @string: Pointer to the string if found + * + * Find a string by a given index in a string array and if it is found return + * the string value in @string. + * + * Return: %0 if the property was found (success), + * %-EINVAL if given arguments are not valid, + * %-ENODATA if the property does not have a value, + * %-EPROTO if the property is not an array of strings, + * %-ENXIO if no suitable firmware interface is present. + */ +int fwnode_property_read_string_index(const struct fwnode_handle *fwnode, + const char *propname, int index, + const char **string) +{ + return fwnode_call_int_op(fwnode, property_read_string_index, propname, + index, + string); +} +EXPORT_SYMBOL_GPL(fwnode_property_read_string_index); + /** * fwnode_property_get_reference_args() - Find a reference with arguments * @fwnode: Firmware node where to look for the reference diff --git a/include/linux/fwnode.h b/include/linux/fwnode.h index 3a532ba66f6c..71ba8f53cf1e 100644 --- a/include/linux/fwnode.h +++ b/include/linux/fwnode.h @@ -93,6 +93,9 @@ struct fwnode_reference_args { * success, a negative error code otherwise. * @property_read_string_array: Read an array of string properties. Return zero * on success, a negative error code otherwise. + * @property_read_string_index: Read a string from a string array using an + * index. Return zero on success, a negative error + * code otherwise. * @get_name: Return the name of an fwnode. * @get_name_prefix: Get a prefix for a node (for printing purposes). * @get_parent: Return the parent of an fwnode. @@ -123,6 +126,9 @@ struct fwnode_operations { (*property_read_string_array)(const struct fwnode_handle *fwnode_handle, const char *propname, const char **val, size_t nval); + int (*property_read_string_index)(const struct fwnode_handle *fwnode, + const char *propname, int index, + const char **string); const char *(*get_name)(const struct fwnode_handle *fwnode); const char *(*get_name_prefix)(const struct fwnode_handle *fwnode); struct fwnode_handle *(*get_parent)(const struct fwnode_handle *fwnode); diff --git a/include/linux/property.h b/include/linux/property.h index 7399a0b45f98..a033920eb10a 100644 --- a/include/linux/property.h +++ b/include/linux/property.h @@ -70,6 +70,9 @@ int fwnode_property_read_string_array(const struct fwnode_handle *fwnode, size_t nval); int fwnode_property_read_string(const struct fwnode_handle *fwnode, const char *propname, const char **val); +int fwnode_property_read_string_index(const struct fwnode_handle *fwnode, + const char *propname, int index, + const char **string); int fwnode_property_match_string(const struct fwnode_handle *fwnode, const char *propname, const char *string); int fwnode_property_get_reference_args(const struct fwnode_handle *fwnode,