linux-kernel - Re: [PATCH 1/3] arm64: dts: ti: k3-j784s4-main: Add MAIN domain R5F cluster nodes

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Date:   Wed, 29 Mar 2023 15:19:33 -0500
From:   Hari Nagalla <hnagalla@...com>
To:     Nishanth Menon <nm@...com>
CC:     <vigneshr@...com>, <kristo@...nel.org>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] arm64: dts: ti: k3-j784s4-main: Add MAIN domain R5F
 cluster nodes

On 3/29/23 07:52, Nishanth Menon wrote:
>>      MAIN R5FSS0 Core0: j784s4-main-r5f0_0-fw (both in LockStep and Split modes)
>>      MAIN R5FSS0 Core1: j784s4-main-r5f0_1-fw (needed only in Split mode)
>>      MAIN R5FSS1 Core0: j784s4-main-r5f1_0-fw (both in LockStep and Split modes)
>>      MAIN R5FSS1 Core1: j784s4-main-r5f1_1-fw (needed only in Split mode)
>>      MAIN R5FSS2 Core0: j784s4-main-r5f2_0-fw (both in LockStep and Split modes)
>>      MAIN R5FSS2 Core1: j784s4-main-r5f2_1-fw (needed only in Split mode)
> Why are the patches split up into main and mcu - if you are adding r5f
> cores, do them as a single patch.
> 
Thought would be cleaner with separated patches for resolving potential 
merge conflicts. But, can combine into one for v2.

 >> +
 >> +	main_r5fss0: r5fss@...0000 {
 >> +		compatible = "ti,j721s2-r5fss";
 >> +		ti,cluster-mode = <1>;
 >> +		#address-cells = <1>;
 >> +		#size-cells = <1>;
 >> +		ranges = <0x5c00000 0x00 0x5c00000 0x20000>,
 >> +			 <0x5d00000 0x00 0x5d00000 0x20000>;
 >> +		power-domains = <&k3_pds 336 TI_SCI_PD_EXCLUSIVE>;
 >> +
 >> +		main_r5fss0_core0: r5f@...0000 {
 >> +			compatible = "ti,j721s2-r5f";
 >> +			reg = <0x5c00000 0x00010000>,
 >> +			      <0x5c10000 0x00010000>;
 >> +			reg-names = "atcm", "btcm";
 >> +			ti,sci = <&sms>;
 >> +			ti,sci-dev-id = <339>;
 >> +			ti,sci-proc-ids = <0x06 0xff>;
 >> +			resets = <&k3_reset 339 1>;
 >> +			firmware-name = "j784s4-main-r5f0_0-fw";
 >> +			ti,atcm-enable = <1>;
 >> +			ti,btcm-enable = <1>;
 >> +			ti,loczrama = <1>;
 >> +			status = "disabled";
 > Why are these disabled by default?
Well, the idea is to let the board specific device tree enable needed 
remote core nodes in *-evm/sk.dts and disable by default in SoC device 
tree files by default.