Re: [PATCH v4 1/4] arm64: dts: ti: k3-am62a7-sk: Split r5f memory region

[Markus Schneider-Pargmann]

Hi Nishanth,

On Tue May 5, 2026 at 2:41 PM CEST, Nishanth Menon wrote:
> On 15:22-20260429, Markus Schneider-Pargmann (TI) wrote:
>> Split the firmware memory region in more specific parts so it is better
>> described where to find which information. Specifically the LPM metadata
>> region is important as bootloader software like U-Boot has to know where
>> that data is to be able to read that data.
>> 
>> Signed-off-by: Markus Schneider-Pargmann (TI) <msp@xxxxxxxxxxxx>
>> ---
>>  arch/arm64/boot/dts/ti/k3-am62a7-sk.dts | 40 +++++++++++++++++++++++++++++++--
>>  1 file changed, 38 insertions(+), 2 deletions(-)
>> 
>> diff --git a/arch/arm64/boot/dts/ti/k3-am62a7-sk.dts b/arch/arm64/boot/dts/ti/k3-am62a7-sk.dts
>> index c1e9067b3bdd5ab0591541d4685bb17a5dac4f65..6f2ee93c7be141ee5ae3f1e3324d3a060db069f6 100644
>> --- a/arch/arm64/boot/dts/ti/k3-am62a7-sk.dts
>> +++ b/arch/arm64/boot/dts/ti/k3-am62a7-sk.dts
>> @@ -59,9 +59,33 @@ wkup_r5fss0_core0_dma_memory_region: memory@9c800000 {
>>  			no-map;
>>  		};
>>  
>> -		wkup_r5fss0_core0_memory_region: memory@9c900000 {
>> +		wkup_r5fss0_core0_ipc_region: memory@9c900000 {
>
> Looks like you have'nt addressed Vignesh's comments from previous
> revision.
>
> https://lore.kernel.org/all/DHS46FH9ZYZB.3BG6HVH832NAE@xxxxxxxxxxxx/

Sorry, I was trying to understand the issue in that thread but I didn't
and didn't get a response so I couldn't really address it.

>
> We dropped wkup_r5fss0_core0_memory_region here..
>
>>  #include "k3-am62a-ti-ipc-firmware.dtsi"
> In this file:
> https://git.kernel.org/pub/scm/linux/kernel/git/ti/linux.git/tree/arch/arm64/boot/dts/ti/k3-am62a-ti-ipc-firmware.dtsi#n27

This file line 27 is
	mcu_r5fss0_core0_memory_region: memory@9b900000 {
		compatible = "shared-dma-pool";
		reg = <0x00 0x9b900000 0x00 0xf00000>;
		no-map;
	};

But my patch is removing wkup_r5fss0_core0_memory_region and not
touching the mcu_* definitions.

> https://git.kernel.org/pub/scm/linux/kernel/git/ti/linux.git/tree/arch/arm64/boot/dts/ti/k3-am62a-ti-ipc-firmware.dtsi#n68
>
> I am not clear where wkup_r5fss0_core0_memory_region is now defined.

It is not defined anymore for k3-am62a7-sk.

> BUT, in the patch, we introduce:
>
>> +
>> +&wkup_r5fss0_core0 {
>> +	memory-region = <&wkup_r5fss0_core0_dma_memory_region>,
>> +			<&wkup_r5fss0_core0_ipc_region>,
>> +			<&wkup_r5fss0_core0_lpm_fs_stub_region>,
>> +			<&wkup_r5fss0_core0_lpm_metadata_region>,
>> +			<&wkup_r5fss0_core0_lpm_rest_region>,
>> +			<&wkup_r5fss0_core0_dm_region>;
>> +	memory-region-names = "dma", "ipc", "lpm-stub",
>> +			      "lpm-metadata", "lpm-context",
>> +			      "dm-firmware";
>> +};
>
>
> So we go ahead an override the definitions of ipc-firmware.dtsi for
> wkup_r5fss0_core0 here - explaining why the build does'nt fail. I am
> confused why the ipc firmware dtsi was'nt updated instead? is this
> something different firmware dtsi now? if so, we should split the
> ipc-firmware.dtsi accordingly. Commit message does'nt mention the same
> either. This right solution is to make up our minds if ipc-firmware.dtsi
> is meant for LPM mode support or not. if not, split the dtsi, if yes, do
> the mods in the ipc.dtsi

We can update the firmware definitions as well. I currently only did
this for am62a and am62p as these require the new format so IO+DDR
works. But if you prefer I can make the changes to firmware.dtsi
instead.

Best
Markus

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