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From: Rob Herring <robh@kernel.org>
To: Russell King <linux@armlinux.org.uk>, James Morse <james.morse@arm.com>,
 Catalin Marinas <catalin.marinas@arm.com>, Will Deacon <will@kernel.org>,
 Guo Ren <guoren@kernel.org>, Jonas Bonn <jonas@southpole.se>,
 Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>,
 Stafford Horne <shorne@gmail.com>, Michael Ellerman <mpe@ellerman.id.au>,
 Paul Walmsley <paul.walmsley@sifive.com>,
 Palmer Dabbelt <palmer@dabbelt.com>, Albert Ou <aou@eecs.berkeley.edu>,
 Yoshinori Sato <ysato@users.sourceforge.jp>, Rich Felker <dalias@libc.org>,
 x86@kernel.org, Greg Kroah-Hartman <gregkh@linuxfoundation.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>
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Cc: devicetree@vger.kernel.org, Florian Fainelli <f.fainelli@gmail.com>,
 Scott Branden <sbranden@broadcom.com>, "Rafael J. Wysocki" <rafael@kernel.org>,
 linux-sh@vger.kernel.org, Ray Jui <rjui@broadcom.com>,
 "H. Peter Anvin" <hpa@zytor.com>, linux-kernel@vger.kernel.org,
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 linuxppc-dev@lists.ozlabs.org, Ingo Molnar <mingo@redhat.com>,
 Paul Mackerras <paulus@samba.org>, Borislav Petkov <bp@alien8.de>,
 bcm-kernel-feedback-list@broadcom.com, Thomas Gleixner <tglx@linutronix.de>,
 Frank Rowand <frowand.list@gmail.com>, linux-riscv@lists.infradead.org,
 linux-arm-kernel@lists.infradead.org
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 <linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.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 <frowand.list@gmail.com>
Signed-off-by: Rob Herring <robh@kernel.org>
---
 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)
-- 
2.30.2