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

From: Dragan Simic
Date: Mon Mar 24 2025 - 05:37:12 EST


Hello Quentin,

On 2025-03-23 11:19, 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. :)

Oh, now I see what you actually wrote above, which I misread a bit
initially... In fact, the upper ambient temperature limit is the
same for both RK3588J and RK3588, according to the datasheets; it's
just that the lower temperature limit is much lower for the RK3588J,
which the patch description says.

I'm not sure where did you find the 80 vs. 85 oC difference; please,
see a couple of screenshots from the datasheets, linked below:

- RK3588 datasheet v1.6 (v1.7 is the same): https://0x0.st/8j1a.png
- RK3588J datasheet v1.1: https://0x0.st/8j1m.png

The v2 of the patch is coming soon, with the patch description improved
according to your suggestions.