linux-kernel - Re: [PATCH v5 1/7] arm64: dts: ti: am62p: Rename am62p-{}.dtsi to am62p-j722s-common-{}.dtsi

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Date: Tue, 11 Jun 2024 14:40:43 +0530
From: Vignesh Raghavendra <vigneshr@...com>
To: Siddharth Vadapalli <s-vadapalli@...com>,
        Roger Quadros
	<rogerq@...nel.org>
CC: <nm@...com>, <afd@...com>, <kristo@...nel.org>, <robh@...nel.org>,
        <krzk+dt@...nel.org>, <conor+dt@...nel.org>,
        <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 1/7] arm64: dts: ti: am62p: Rename am62p-{}.dtsi to
 am62p-j722s-common-{}.dtsi



On 11/06/24 14:24, Siddharth Vadapalli wrote:
> On Mon, Jun 10, 2024 at 10:31:07PM +0300, Roger Quadros wrote:
> 
> [...]
> 
>>> Based on your suggestion, you seem to propose the following hierarchy:
>>> k3-am62p-{main,mcu,thermal,wakeup}.dtsi = AM62P specific data
>>> k3-am62p.dtsi = k3-am62p-j722s-common-main.dtsi +
>>> 		k3-am62p-j722s-common-mcu.dtsi +
>>> 		k3-am62p-j722s-common-wakeup.dtsi +
>>> 		k3-am62p-j722s-common-thermal.dtsi +
>>> 		k3-am62p-{main,mcu,thermal,wakeup}.dtsi +
>>> 		<delta-5>
>>> k3-am62p5.dtsi = k3-am62p.dtsi + <delta-2>
>>> k3-j722s-{main,mcu,thermal,wakeup}.dtsi = J722S specific data
>>> k3-j722s.dtsi = k3-am62p-j722s-common-main.dtsi +
>>> 		k3-am62p-j722s-common-mcu.dtsi +
>>> 		k3-am62p-j722s-common-wakeup.dtsi +
>>> 		k3-am62p-j722s-common-thermal.dtsi +
>>> 		k3-j722s-{main,mcu,thermal,wakeup}.dtsi +
>>> 		<delta-6>
>>
>> What is the equivalent of k3-am62p5.dtsi here?
>> That should contain k3-j722s.dtsi + CPU and OPP stuff.
>>
>> I suppose it should be named specific to the SoC variant part number?
> 
> AM62P (https://www.ti.com/product/AM62P) has two variants:
> 1. 2 Arm Cortex-A53 => AM62P3
> 2. 4 Arm Cortex-A53 => AM62P5
> Both variants will share the common k3-am62p.dtsi
> 
> J722S (https://www.ti.com/product/TDA4VEN-Q1) has only one variant:
> 4 Arm Cortex-A53 => J722S
> Which is currently identical to AM62P5 w.r.t. the number of A53s.
> 
> So there isn't an equivalent of AM62P5/k3-am62p5.dtsi for J722S.
> k3-j722s.dtsi is a combination of k3-am62p.dtsi and k3-am62p5.dtsi.
> 


Historically AM6xx devices have had CPUs in separte file as there are OPNs with different number of CPU cores Hence, how about
k3-am62p5.dtsi => k3-am62p.dtsi + k3-am62p-j722s-common-{main,mcu,wakeup}.dtsi + k3-am62p-main.dtsi (USB2 and other deltas specific to AM62P)

and since J722s has no variants with less than 4 cores (and along the lines of rest of J7xx devices):

k3-j722s.dtsi => k3-am62p-j722s-common-{main,mcu,wakeup}.dtsi + k3-j722s-main.dtsi (USB3, C7x and other deltas specific to J722s;


-- 
Regards
Vignesh