From patchwork Thu Jan 25 16:42:36 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexandru Elisei X-Patchwork-Id: 13531368 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 5BC161339BA; Thu, 25 Jan 2024 16:44:14 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706201055; cv=none; b=Fe8jbOPRBGULVbKcttZ+en0iUgdlQq22Ud8EjBRDgtg2QVb6oI9tYD0tg3utYiBPcLW8xmQsWpwjtBtLXFwYLxPNCsnRLbbabgLLqWVausT+mEMxk05PYoj5Wzj3q4fuy1yI+U4D+vAzBE/nXhWv+0rctE68BiTfVbvFevMWrGU= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706201055; c=relaxed/simple; bh=7/IUb3XLktUN45V9JyajrdKMq9EZsYTVNnF5KRHa0mo=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=RrSv7I40ltwjMpiJJODirVCL+wr0RaLJ/CISXYhDP+Zn2gki4wkeonhKUculqDJmesiDXcIL2FT9ONiAUZD1MBSFmOXrWBkcmBbPZr/zBDwxKCyAbBC4qEOmIXFUUEAvTjmNzczHTiReSPxjwTTJGzwu2fHLyVjiV6iMt/fCum8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; arc=none smtp.client-ip=217.140.110.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 48AE015BF; Thu, 25 Jan 2024 08:44:58 -0800 (PST) Received: from e121798.cable.virginm.net (unknown [172.31.20.19]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 5846F3F5A1; Thu, 25 Jan 2024 08:44:08 -0800 (PST) From: Alexandru Elisei To: catalin.marinas@arm.com, will@kernel.org, oliver.upton@linux.dev, maz@kernel.org, james.morse@arm.com, suzuki.poulose@arm.com, yuzenghui@huawei.com, arnd@arndb.de, akpm@linux-foundation.org, mingo@redhat.com, peterz@infradead.org, juri.lelli@redhat.com, vincent.guittot@linaro.org, dietmar.eggemann@arm.com, rostedt@goodmis.org, bsegall@google.com, mgorman@suse.de, bristot@redhat.com, vschneid@redhat.com, mhiramat@kernel.org, rppt@kernel.org, hughd@google.com Cc: pcc@google.com, steven.price@arm.com, anshuman.khandual@arm.com, vincenzo.frascino@arm.com, david@redhat.com, eugenis@google.com, kcc@google.com, hyesoo.yu@samsung.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, kvmarm@lists.linux.dev, linux-fsdevel@vger.kernel.org, linux-arch@vger.kernel.org, linux-mm@kvack.org, linux-trace-kernel@vger.kernel.org Subject: [PATCH RFC v3 15/35] of: fdt: Add of_flat_read_u32() Date: Thu, 25 Jan 2024 16:42:36 +0000 Message-Id: <20240125164256.4147-16-alexandru.elisei@arm.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240125164256.4147-1-alexandru.elisei@arm.com> References: <20240125164256.4147-1-alexandru.elisei@arm.com> Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Add the function of_flat_read_u32() to return the value of a property as an u32. Signed-off-by: Alexandru Elisei --- Changes since rfc v2: * New patch, suggested by Rob Herring. drivers/of/fdt.c | 21 +++++++++++++++++++++ include/linux/of_fdt.h | 2 ++ 2 files changed, 23 insertions(+) diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c index bf502ba8da95..dfcd79fd5fd9 100644 --- a/drivers/of/fdt.c +++ b/drivers/of/fdt.c @@ -755,6 +755,27 @@ const void *__init of_get_flat_dt_prop(unsigned long node, const char *name, return fdt_getprop(initial_boot_params, node, name, size); } +/* + * of_flat_read_u32 - Return the value of the given property as an u32. + * + * @node: device node from which the property value is to be read + * @propname: name of the property + * @out_value: the value of the property + * @return: 0 on success, -EINVAL if property does not exist + */ +int __init of_flat_read_u32(unsigned long node, const char *propname, + u32 *out_value) +{ + const __be32 *reg; + + reg = of_get_flat_dt_prop(node, propname, NULL); + if (!reg) + return -EINVAL; + + *out_value = be32_to_cpup(reg); + return 0; +} + /** * of_fdt_is_compatible - Return true if given node from the given blob has * compat in its compatible list diff --git a/include/linux/of_fdt.h b/include/linux/of_fdt.h index 0e26f8c3b10e..d7901699061b 100644 --- a/include/linux/of_fdt.h +++ b/include/linux/of_fdt.h @@ -57,6 +57,8 @@ extern const void *of_get_flat_dt_prop(unsigned long node, const char *name, extern int of_flat_dt_is_compatible(unsigned long node, const char *name); extern unsigned long of_get_flat_dt_root(void); extern uint32_t of_get_flat_dt_phandle(unsigned long node); +extern int of_flat_read_u32(unsigned long node, const char *propname, + u32 *out_value); extern int early_init_dt_scan_chosen(char *cmdline); extern int early_init_dt_scan_memory(void);