Re: [PATCH] arm64: dts: rockchip: Remove overdrive-mode OPPs from RK3588J SoC dtsi

[Quentin Schulz <quentin.schulz@cherry.de>]

Hi Dragan,

On 3/24/25 10:53 AM, Dragan Simic wrote:
> Hello Quentin,
> 
> On 2025-03-24 10:23, Quentin Schulz wrote:
>> On 3/23/25 11:19 AM, Dragan Simic wrote:
>>> On 2025-03-21 10:53, Quentin Schulz wrote:
>>>> On 3/21/25 4:28 AM, Dragan Simic wrote:
>>>>> The differences in the vendor-approved CPU and GPU OPPs for the 
>>>>> standard
>>>>> Rockchip RK3588 variant [1] and the industrial Rockchip RK3588J 
>>>>> variant [2]
>>>>> come from the latter, presumably, supporting an extended 
>>>>> temperature range
>>>>> that's usually associated with industrial applications, despite the 
>>>>> two SoC
>>>>> variant datasheets specifying the same upper limit for the allowed 
>>>>> ambient
>>>>> temperature for both variants.  However, the lower temperature 
>>>>> limit is
>>>>
>>>> RK3588 is rated for 0-80°C, RK3588J for -40-85°C, c.f. Recommended
>>>> Operating Conditions, Table 3-2, Ambient Operating Temperature.
>>>
>>> Indeed, which is why I specifically wrote "specifying the same upper
>>> limit", because having a lower negative temperature limit could hardly
>>> put the RK3588J in danger of overheating or running hotter. :)
>>
>> """
>> despite the two SoC variant datasheets specifying the same upper limit
>> for the allowed temperature for both variants
>> """
>>
>> is incorrect. The whole range is different, yes it's only a 5°C
>> difference for the upper limit, but they still are different.
> 
> I just commented on this separately, with a couple of datasheet
> screenshots, before I saw your latest response.  Please, have
> a look at that message.
> 

I see, I had a v1.3 datasheet opened:

https://github.com/FanX-Tek/rk3588-TRM-and-Datasheet/blob/master/Rockchip_RK3588_Datasheet_V1.3-20220328.pdf

Interestingly, it seems the RK3588S (still?) has a smaller operating range:

https://www.armboard.cn/download/Rockchip_RK3588S_Datasheet_V1.6-20240821.pdf

Cheers,
Quentin