linux-kernel - Re: [PATCH v6 1/2] of: Documentation: Specify local APIC ID in "reg"

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Message-ID: <alpine.DEB.2.21.1803191405340.2010@nanos.tec.linutronix.de>
Date:   Mon, 19 Mar 2018 14:06:06 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Ivan Gorinov <ivan.gorinov@...el.com>
cc:     Frank Rowand <frowand.list@...il.com>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        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: Re: [PATCH v6 1/2] of: Documentation: Specify local APIC ID in
 "reg"

Rob,

On Tue, 13 Mar 2018, Ivan Gorinov wrote:

> Use the "reg" property to specify the processor's local APIC ID.
> Local APIC ID is assigned by hardware and may differ from CPU number.

Any opinion on this version?

Thanks,

	tglx

> Signed-off-by: Ivan Gorinov <ivan.gorinov@...el.com>
> ---
>  Documentation/devicetree/bindings/x86/ce4100.txt | 37 ++++++++++++++++++------
>  1 file changed, 28 insertions(+), 9 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/x86/ce4100.txt b/Documentation/devicetree/bindings/x86/ce4100.txt
> index b49ae59..1c41cbd 100644
> --- a/Documentation/devicetree/bindings/x86/ce4100.txt
> +++ b/Documentation/devicetree/bindings/x86/ce4100.txt
> @@ -7,17 +7,36 @@ Many of the "generic" devices like HPET or IO APIC have the ce4100
>  name in their compatible property because they first appeared in this
>  SoC.
>  
> -The CPU node
> -------------
> -	cpu@0 {
> -		device_type = "cpu";
> -		compatible = "intel,ce4100";
> -		reg = <0>;
> -		lapic = <&lapic0>;
> +The CPU nodes
> +-------------
> +
> +	cpus {
> +		#address-cells = <1>;
> +		#size-cells = <0>;
> +
> +		cpu@...0 {
> +			device_type = "cpu";
> +			compatible = "intel,ce4100";
> +			reg = <0x00>;
> +		};
> +
> +		cpu@...2 {
> +			device_type = "cpu";
> +			compatible = "intel,ce4100";
> +			reg = <0x02>;
> +		};
>  	};
>  
> -The reg property describes the CPU number. The lapic property points to
> -the local APIC timer.
> +A "cpu" node describes one logical processor (hardware thread).
> +
> +Required properties:
> +
> +- device_type
> +	Device type, must be "cpu".
> +
> +- reg
> +	Local APIC ID, the unique number assigned to each processor by
> +	system hardware.
>  
>  The SoC node
>  ------------
> -- 
> 2.7.4
> 
>