linux-kernel - Re: [PATCH v2 1/4] arm64: dts: ti: k3-j784s4-main: Add bootph-pre-ram property for SPL nodes

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Date:   Mon, 7 Aug 2023 14:07:39 -0500
From:   Nishanth Menon <nm@...com>
To:     Apurva Nandan <a-nandan@...com>
CC:     Vignesh Raghavendra <vigneshr@...com>,
        Tero Kristo <kristo@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Udit Kumar <u-kumar1@...com>, Hari Nagalla <hnagalla@...com>,
        Dasnavis Sabiya <sabiya.d@...tralsolutions.com>,
        Tom Rini <trini@...sulko.com>
Subject: Re: [PATCH v2 1/4] arm64: dts: ti: k3-j784s4-main: Add
 bootph-pre-ram property for SPL nodes

On 00:26-20230808, Apurva Nandan wrote:
> Add bootph-pre-ram property for all the nodes used in SPL stage,
> for syncing it later to u-boot j784s4 dts.
> 
> Signed-off-by: Apurva Nandan <a-nandan@...com>
> ---

We need to rework this a little more:

The approach taken in this series is enable pre-ram for everything. I am
not sure that is the right direction.

https://github.com/devicetree-org/dt-schema/blob/e87ba2f515392c2a4694642063efb43023331ff6/dtschema/schemas/bootph.yaml#L70

patch #1: board generic changes: patch #1
patch #2-: board specific change (per board)

Make sure you use the correct property and document why this is needed
in the section added as well - esp for board generic changes introduced
into SoC.dtsi files.


>  arch/arm64/boot/dts/ti/k3-j784s4-main.dtsi | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/ti/k3-j784s4-main.dtsi b/arch/arm64/boot/dts/ti/k3-j784s4-main.dtsi
> index 2ea0adae6832..aaec569fe91a 100644
> --- a/arch/arm64/boot/dts/ti/k3-j784s4-main.dtsi
> +++ b/arch/arm64/boot/dts/ti/k3-j784s4-main.dtsi
> @@ -6,6 +6,7 @@
>   */
>  
>  &cbass_main {
> +	bootph-pre-ram;

Is this better done where the node is defined?

>  	msmc_ram: sram@...00000 {
>  		compatible = "mmio-sram";
>  		reg = <0x00 0x70000000 0x00 0x800000>;
> @@ -670,6 +671,7 @@ main_sdhci1: mmc@...0000 {
>  	};
>  
>  	main_navss: bus@...00000 {
> +		bootph-pre-ram;
>  		compatible = "simple-bus";
>  		#address-cells = <2>;
>  		#size-cells = <2>;
> @@ -705,6 +707,7 @@ main_udmass_inta: msi-controller@...00000 {
>  		};
>  
>  		secure_proxy_main: mailbox@...00000 {
> +			bootph-pre-ram;
>  			compatible = "ti,am654-secure-proxy";
>  			#mbox-cells = <1>;
>  			reg-names = "target_data", "rt", "scfg";
> -- 
> 2.34.1
> 

-- 
Regards,
Nishanth Menon
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