From patchwork Wed Oct 6 16:43:21 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Rob Herring (Arm)" X-Patchwork-Id: 12539755 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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3AFAAC43219 for ; Wed, 6 Oct 2021 16:43:41 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2894C610E5 for ; Wed, 6 Oct 2021 16:43:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238827AbhJFQpb (ORCPT ); Wed, 6 Oct 2021 12:45:31 -0400 Received: from mail-oi1-f169.google.com ([209.85.167.169]:42791 "EHLO mail-oi1-f169.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232381AbhJFQpa (ORCPT ); Wed, 6 Oct 2021 12:45:30 -0400 Received: by mail-oi1-f169.google.com with SMTP id x187so2464376oix.9; Wed, 06 Oct 2021 09:43:37 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=uA/cSYcpVyY62IJQPXwhEfvcH0a7DNNoh6QF/gbSv/o=; b=ODDM5tXYhSPxk2r/bCjAb5vFG1of6jbKB2UaKspq/dUbxxnFM9foFyghdlXZvWqxeJ 3q0DQJ5gkypQ+i7dJ0Id6IprWk22PuoDb3Ig+xEuyQKjUBTYLLxT22x3GTiwv/Oosco5 oslX8k+wVOYYJfmNdGJM8EiSGAjvQeptoK4Q1RmWInxnIsASFsKBhTfGRcHdUI5pqCNd CMMa1NPTe+UjJt+WsUNPbPn1jPNQX/uK7+9pSlS0qgz1X79wOzyooUTU373PYGoXTKmT t+PTgYTiAT0m3y65w6RWVx9jXPS4nBcn/xhUVzkBj819Y4fpXBOybO2OzdlpLw5+2gmT 2O+Q== X-Gm-Message-State: AOAM532RtxGJ8v/7tj8ZHsPCewZ8T5MtEdGeTGTrnxh6QktQEAK6tvCu yA7Jq1q4EmEMHPJjk9NCvQ== X-Google-Smtp-Source: ABdhPJyz5HqR6tKtFIEsHk/GSarLhJvs4xTI3uQnRBWEIdAL05spj94Pn3luIAFrkmprFHNc17eP4A== X-Received: by 2002:a05:6808:231f:: with SMTP id bn31mr855081oib.66.1633538617237; Wed, 06 Oct 2021 09:43:37 -0700 (PDT) Received: from xps15.herring.priv (66-90-148-213.dyn.grandenetworks.net. [66.90.148.213]) by smtp.googlemail.com with ESMTPSA id s29sm4236628otg.60.2021.10.06.09.43.35 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 06 Oct 2021 09:43:36 -0700 (PDT) From: Rob Herring To: Russell King , James Morse , Catalin Marinas , Will Deacon , Guo Ren , Jonas Bonn , Stefan Kristiansson , Stafford Horne , Michael Ellerman , Paul Walmsley , Palmer Dabbelt , Albert Ou , Yoshinori Sato , Rich Felker , x86@kernel.org, Greg Kroah-Hartman Cc: Florian Fainelli , Ray Jui , Scott Branden , bcm-kernel-feedback-list@broadcom.com, Benjamin Herrenschmidt , Paul Mackerras , Thomas Gleixner , Ingo Molnar , Borislav Petkov , "H. Peter Anvin" , "Rafael J. Wysocki" , Frank Rowand , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-csky@vger.kernel.org, openrisc@lists.librecores.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-sh@vger.kernel.org, devicetree@vger.kernel.org Subject: [PATCH 01/12] of: Add of_get_cpu_hwid() to read hardware ID from CPU nodes Date: Wed, 6 Oct 2021 11:43:21 -0500 Message-Id: <20211006164332.1981454-2-robh@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20211006164332.1981454-1-robh@kernel.org> References: <20211006164332.1981454-1-robh@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-sh@vger.kernel.org There are various open coded implementions parsing the CPU node 'reg' property which contains the CPU's hardware ID. Introduce a new function, of_get_cpu_hwid(), to read the hardware ID. All the callers should be DT only code, so no need for an empty function. Cc: Frank Rowand Signed-off-by: Rob Herring Reviewed-by: Sudeep Holla --- drivers/of/base.c | 22 ++++++++++++++++++++++ include/linux/of.h | 1 + 2 files changed, 23 insertions(+) diff --git a/drivers/of/base.c b/drivers/of/base.c index f720c0d246f2..e587ab44be22 100644 --- a/drivers/of/base.c +++ b/drivers/of/base.c @@ -286,6 +286,28 @@ const void *of_get_property(const struct device_node *np, const char *name, } EXPORT_SYMBOL(of_get_property); +/** + * of_get_cpu_hwid - Get the hardware ID from a CPU device node + * + * @cpun: CPU number(logical index) for which device node is required + * @thread: The local thread number to get the hardware ID for. + * + * Return: The hardware ID for the CPU node or ~0ULL if not found. + */ +u64 of_get_cpu_hwid(struct device_node *cpun, unsigned int thread) +{ + const __be32 *cell; + int ac, len; + + ac = of_n_addr_cells(cpun); + cell = of_get_property(cpun, "reg", &len); + if (!cell || !ac || ((sizeof(*cell) * ac * (thread + 1)) > len)) + return ~0ULL; + + cell += ac * thread; + return of_read_number(cell, ac); +} + /* * arch_match_cpu_phys_id - Match the given logical CPU and physical id * diff --git a/include/linux/of.h b/include/linux/of.h index 6f1c41f109bb..807f8168dad9 100644 --- a/include/linux/of.h +++ b/include/linux/of.h @@ -353,6 +353,7 @@ extern struct device_node *of_get_cpu_node(int cpu, unsigned int *thread); extern struct device_node *of_get_next_cpu_node(struct device_node *prev); extern struct device_node *of_get_cpu_state_node(struct device_node *cpu_node, int index); +extern u64 of_get_cpu_hwid(struct device_node *cpun, unsigned int thread); #define for_each_property_of_node(dn, pp) \ for (pp = dn->properties; pp != NULL; pp = pp->next)