[PATCH 3/3] arm64: dts: rockchip: Add Radxa E52C

[FUKAUMI Naoki]

Hi Marc,

On 12/23/24 18:39, Marc Zyngier wrote:
> On Sun, 22 Dec 2024 03:03:55 +0000,
> FUKAUMI Naoki <naoki at radxa.com> wrote:
>>
>> Radxa E52C is a compact network computer[1] based on the Rockchip
>> RK3582 SoC:
>>
>> - Dual Cortex-A76 and quad Cortex-A55 CPU
> 
> So you have *two* big cores.
> 
>> - 5TOPS NPU
>> - 2GB/4GB/8GB LPDDR4 RAM
>> - 16GB/32GB/64GB on-board eMMC
>> - microSD card slot
>> - USB 3.0 Type-A HOST port
>> - USB Type-C debug port
>> - USB Type-C power port (5V only)
>> - 2x 2.5GbE ports
>>
>> [1] https://radxa.com/products/network-computer/e52c
>>
>> Signed-off-by: FUKAUMI Naoki <naoki at radxa.com>
>> ---
>>   arch/arm64/boot/dts/rockchip/Makefile         |   1 +
>>   .../boot/dts/rockchip/rk3582-radxa-e52c.dts   | 729 ++++++++++++++++++
>>   2 files changed, 730 insertions(+)
>>   create mode 100644 arch/arm64/boot/dts/rockchip/rk3582-radxa-e52c.dts
> 
> [...]
> 
>> +&cpu_b0 {
>> +	cpu-supply = <&vdd_cpu_big0_s0>;
>> +};
>> +
>> +&cpu_b1 {
>> +	cpu-supply = <&vdd_cpu_big0_s0>;
>> +};
>> +
>> +&cpu_b2 {
>> +	cpu-supply = <&vdd_cpu_big1_s0>;
>> +};
>> +
>> +&cpu_b3 {
>> +	cpu-supply = <&vdd_cpu_big1_s0>;
>> +};
> 
> And yet you configure 4. If your HW only has 2 A76s, surely something
> should remove these cores for this platform rather than keep them
> around.

One of the four cores may be defective. This information is stored in 
the OTP, so we need to run our software to detect which core is 
defective. Then we disable the cluster that contains the defective core.

please refer
  https://patchwork.ozlabs.org/project/uboot/patch/20241210222341.3537543-2-jonas@kwiboo.se/

Best regards,

--
FUKAUMI Naoki
Radxa Computer (Shenzhen) Co., Ltd.

> Thanks,
> 
> 	M.
>