linux-kernel - [PATCH v4 3/4] of: Documentation: Add x86 local APIC ID property

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Message-ID: <3a0359afad71abc0c0d682bfcd0dd66055f5d7e5.1520450752.git.ivan.gorinov@intel.com>
Date:   Wed, 7 Mar 2018 11:47:05 -0800
From:   Ivan Gorinov <ivan.gorinov@...el.com>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...hat.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>
Subject: [PATCH v4 3/4] of: Documentation: Add x86 local APIC ID property

Current x86 Device Tree implementation does not support multiprocessing.
Add new "intel,apic-id" property to allow using CPU descriptions
in Device Tree data provided by the U-Boot loader.
Address specified in 'reg' to be used as default local APIC ID
to avoid breaking existing systems with DTB provided by firmware.

Signed-off-by: Ivan Gorinov <ivan.gorinov@...el.com>
---
 Documentation/devicetree/bindings/x86/ce4100.txt | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Documentation/devicetree/bindings/x86/ce4100.txt b/Documentation/devicetree/bindings/x86/ce4100.txt
index b49ae59..d15de48 100644
--- a/Documentation/devicetree/bindings/x86/ce4100.txt
+++ b/Documentation/devicetree/bindings/x86/ce4100.txt
@@ -14,11 +14,17 @@ The CPU node
 		compatible = "intel,ce4100";
 		reg = <0>;
 		lapic = <&lapic0>;
+		intel,apic-id = <0>;
 	};
 
 The reg property describes the CPU number. The lapic property points to
 the local APIC timer.
 
+Optional properties:
+
+- intel,apic-id: local APIC ID.
+  The address specified in "reg" is used as default local APIC ID.
+
 The SoC node
 ------------
 
-- 
2.7.4