linux-kernel - Re: [PATCH v5 4/7] arm64: dts: ti: k3-j722s: Switch to k3-am62p-j722s-common.dtsi

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Date: Mon, 10 Jun 2024 12:23:36 +0530
From: Vignesh Raghavendra <vigneshr@...com>
To: Roger Quadros <rogerq@...nel.org>,
        Siddharth Vadapalli
	<s-vadapalli@...com>, <nm@...com>, <afd@...com>,
        <kristo@...nel.org>, <robh@...nel.org>, <krzk+dt@...nel.org>,
        <conor+dt@...nel.org>
CC: <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <u-kumar1@...com>,
        <danishanwar@...com>, <srk@...com>
Subject: Re: [PATCH v5 4/7] arm64: dts: ti: k3-j722s: Switch to
 k3-am62p-j722s-common.dtsi



On 06/06/24 13:04, Roger Quadros wrote:
> 
> 
> On 06/06/2024 07:05, Vignesh Raghavendra wrote:
>>
>>
>> On 04/06/24 14:22, Siddharth Vadapalli wrote:
>>> Update "k3-j722s.dtsi" to use "k3-am62p-j722s-common.dtsi" which
>>> contains the nodes shared with AM62P, followed by including the J722S
>>> specific main domain peripherals contained in "k3-j722s-main.dtsi".
>>>
>>> Signed-off-by: Siddharth Vadapalli <s-vadapalli@...com>
>>> ---
>>> v4:
>>> https://lore.kernel.org/r/20240601121554.2860403-5-s-vadapalli@ti.com/
>>> No changes since v4.
>>>
>>>  arch/arm64/boot/dts/ti/k3-j722s.dtsi | 97 +++++++++++++++++++++++++++-
>>>  1 file changed, 96 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/arch/arm64/boot/dts/ti/k3-j722s.dtsi b/arch/arm64/boot/dts/ti/k3-j722s.dtsi
>>> index c75744edb143..9e04e6a5c0fd 100644
>>> --- a/arch/arm64/boot/dts/ti/k3-j722s.dtsi
>>> +++ b/arch/arm64/boot/dts/ti/k3-j722s.dtsi
>>> @@ -10,12 +10,107 @@
>>>  #include <dt-bindings/interrupt-controller/arm-gic.h>
>>>  #include <dt-bindings/soc/ti,sci_pm_domain.h>
>>>  
>>> -#include "k3-am62p5.dtsi"
>>> +#include "k3-am62p-j722s-common.dtsi"
>>> +#include "k3-j722s-main.dtsi"
>>>  
>>>  / {
>>>  	model = "Texas Instruments K3 J722S SoC";
>>>  	compatible = "ti,j722s";
>>>  
>>> +	cpus {
>>> +		#address-cells = <1>;
>>> +		#size-cells = <0>;
>>> +
>>> +		cpu-map {
>>> +			cluster0: cluster0 {
>>> +				core0 {
>>> +					cpu = <&cpu0>;
>>> +				};
>>> +
>>> +				core1 {
>>> +					cpu = <&cpu1>;
>>> +				};
>>> +
>>> +				core2 {
>>> +					cpu = <&cpu2>;
>>> +				};
>>> +
>>> +				core3 {
>>> +					cpu = <&cpu3>;
>>> +				};
>>> +			};
>>> +		};
>>> +
>>> +		cpu0: cpu@0 {
>>> +			compatible = "arm,cortex-a53";
>>> +			reg = <0x000>;
>>> +			device_type = "cpu";
>>> +			enable-method = "psci";
>>> +			i-cache-size = <0x8000>;
>>> +			i-cache-line-size = <64>;
>>> +			i-cache-sets = <256>;
>>> +			d-cache-size = <0x8000>;
>>> +			d-cache-line-size = <64>;
>>> +			d-cache-sets = <128>;
>>> +			next-level-cache = <&l2_0>;
>>> +			clocks = <&k3_clks 135 0>;
>>> +		};
>>> +
>>> +		cpu1: cpu@1 {
>>> +			compatible = "arm,cortex-a53";
>>> +			reg = <0x001>;
>>> +			device_type = "cpu";
>>> +			enable-method = "psci";
>>> +			i-cache-size = <0x8000>;
>>> +			i-cache-line-size = <64>;
>>> +			i-cache-sets = <256>;
>>> +			d-cache-size = <0x8000>;
>>> +			d-cache-line-size = <64>;
>>> +			d-cache-sets = <128>;
>>> +			next-level-cache = <&l2_0>;
>>> +			clocks = <&k3_clks 136 0>;
>>> +		};
>>> +
>>> +		cpu2: cpu@2 {
>>> +			compatible = "arm,cortex-a53";
>>> +			reg = <0x002>;
>>> +			device_type = "cpu";
>>> +			enable-method = "psci";
>>> +			i-cache-size = <0x8000>;
>>> +			i-cache-line-size = <64>;
>>> +			i-cache-sets = <256>;
>>> +			d-cache-size = <0x8000>;
>>> +			d-cache-line-size = <64>;
>>> +			d-cache-sets = <128>;
>>> +			next-level-cache = <&l2_0>;
>>> +			clocks = <&k3_clks 137 0>;
>>> +		};
>>> +
>>> +		cpu3: cpu@3 {
>>> +			compatible = "arm,cortex-a53";
>>> +			reg = <0x003>;
>>> +			device_type = "cpu";
>>> +			enable-method = "psci";
>>> +			i-cache-size = <0x8000>;
>>> +			i-cache-line-size = <64>;
>>> +			i-cache-sets = <256>;
>>> +			d-cache-size = <0x8000>;
>>> +			d-cache-line-size = <64>;
>>> +			d-cache-sets = <128>;
>>> +			next-level-cache = <&l2_0>;
>>> +			clocks = <&k3_clks 138 0>;
>>> +		};
>>> +	};
>>> +
>>> +	l2_0: l2-cache0 {
>>> +		compatible = "cache";
>>> +		cache-unified;
>>> +		cache-level = <2>;
>>> +		cache-size = <0x80000>;
>>> +		cache-line-size = <64>;
>>> +		cache-sets = <512>;
>>> +	};
>>> +
>>>  	cbass_main: bus@...00 {
>>>  		compatible = "simple-bus";
>>>  		#address-cells = <2>;
>>
>>
>> You would need to move the rest of main domain overrides and cbass_main
>> definitions to k3-j722s-main.dtsi and limit this file to CPU definitions
>> similar to k3-am62p5.dtsi
> 
> Not exactly.
> In existing cases there are 2 soc.dtsi files. e.g. k3-am62p.dtsi and k3-am62p5.dtsi.
> or k3-am2.dtsi and k3-am625.dtsi.
> 
> The former includes everything that is required for the SOC variant except the CPU, OPP and cache.
> The later includes just the CPU, OPP and cache.
> 
> I suppose this only makes sense if there are multiple variants of the SoC where only
> the number of CPUs change. Would this be the case for J722S?


Part numbers with different OPPs are expected besides difference in
number of cores for J722s.

> 
> If not then one soc.dtsi file should be sufficient. If yes then we need to have 2 soc.dtsi files
> for J722S like the rest.
> 

-- 
Regards
Vignesh