ARM: sunxi: Support cpufreq on sun[457]i
Get series with b4
b4 am 20150113135312.GX4891@lukatherVersions newest first · linked by author and title
- v3 Latest posting 2/21 of 9 patches 0 repliesNew
- v3 posting 1/22 of 9 patches 0 repliesSuperseded
1 of 9 patches is in this archive. The cover letter announces 9.
Patches in v3 posting 2/2 No applies recorded yet
| # | Subject and files | Size | Replies | Applied |
|---|---|---|---|---|
| 4/9 | ARM: dts: sun7i: cubieboard2: add axp209 regulator nodes | +0 | 0 replies |
Reviews trailers per patch
No Reviewed-by, Acked-by or Tested-by trailers for v3 yet.
Cover letter [PATCH v3 0/9] ARM: sunxi: Support cpufreq on sun[457]i
Quoted 32 lines · Maxime Ripard
Quoted 31 lines · Chen-Yu Tsai
Hi,
This is v3 of the cpufreq support series for sunxi. The series has been rebased onto the latest sunxi-next. I've dropped all the patches Maxime merged. This includes "ARM: sunxi: Register cpufreq-dt for sun[45678]i" which was merged but not published yet.
Individual changes since v2 are listed within each patch.
Original cover letter follows:
This series adds support cpufreq support for sun[457]i using cpufreq-dt. This also supports passive cpu cooling (thermal throttling) using thermal zones with the temperature sensor in the SoC.
The operating points for the supported platforms were taken from the linux-sunxi FEX files repository. The majority of boards use the same settings. Only with sun7i do we see slight variations, either disabling some frequencies, or bumping up the voltage a bit. In either case this can be done by limiting the constraints for the supply regulator, or overriding the OPP table in the board dts file.
On sun7i, there is an additional operating point not found in the FEX files, 960 MHz @ 1.4V, which is the full speed setting in both u-boot-sunxi and mainline u-boot.
The series has been tested on the 4 boards I have. With cpufreq active, the effects are visible as a decrease in SoC internal temperature. Stability for the operating points has been tested using:
Quoted 8 lines
Quoted 6 lines
More real world usage feedback is appreciated. Thermal throttling hasn't been tested much, due to not being able to generate enough load without the GPU for the SoC to heat up. Also on sun4i, the temperature sensor still hasn't been calibrated, so the readings are highly inaccurate.
Applied 2, 3, 6 and 8.
And I just applied 4, 5, 7 and 9.
Thanks!
Signature · 10 lines
Maxime Ripard, Free Electrons Embedded Linux, Kernel and Android engineering http://free-electrons.com -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 819 bytes Desc: Digital signature URL: <http://lists.infradead.org/pipermail/linux-arm-kernel/attachments/20150113/09ad7620/attachment.sig>