Messages in this thread | | | Date | Wed, 31 Dec 2014 01:37:12 +0100 | From | Heinrich Schuchardt <> | Subject | ARM: dts: sun9i: Allwinner A80 dtsi - missing clock-frequency property |
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When booting Linux 3.19-rc2 on a Merrii Optimusboard using arch/arm/boot/dts/sun9i-a80-optimus.dts adn arch/arm/boot/dts/sun9i-a80.dtsi I get errors [ 0.061192] /cpus/cpu@0 missing clock-frequency property [ 0.061209] /cpus/cpu@1 missing clock-frequency property [ 0.061223] /cpus/cpu@2 missing clock-frequency property [ 0.061237] /cpus/cpu@3 missing clock-frequency property [ 0.061251] /cpus/cpu@100 missing clock-frequency property [ 0.061266] /cpus/cpu@101 missing clock-frequency property [ 0.061283] /cpus/cpu@102 missing clock-frequency property [ 0.061300] /cpus/cpu@103 missing clock-frequency property
The dtsi was provided by patch https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=4ab328f06e305bf3ea254f4e3c94bb4d820998c1
According to file pack/chips/sun9iw1p1/optimus/sys_config.fex supplied in the OptimusBoard SDK the big cluster can run at up to 1800 MHz, and the LITTLE cluster can run at up to 1200 MHz,depending on the CPU voltage:
big 1.08V (1608Mhz, 1800Mhz] 1.00V (1536Mhz, 1608Mhz] 0.96V (1440Mhz, 1536Mhz] 0.90V (1296Mhz, 1440Mhz] 0.84V ( 0Mhz, 1296Mhz]
LITTLE 1.02V (1128Mhz, 1200Mhz] 0.96V (1008Mhz, 1128Mhz] 0.90V ( 864Mhz, 1008Mhz] 0.84V ( 0Mhz, 864Mhz]
I guess the proper way to specify the data is the one described in Documentation/devicetree/bindings/cpufreq/arm_big_little_dt.txt
Other boards might run at other frequencies. Hence we might want to put this information into the board file arch/arm/boot/dts/sun9i-a80-optimus.dts.
Documentation/devicetree/bindings/cpufreq/arm_big_little_dt.txt, arch/arm/boot/dts/exynos5260.dtsi, and arch/arm/boot/dts/exynos5420.dtsi, all assume that cpu@0-cpu@3 are A15 (big) and cpu@101-cpu@103 are A7 (LITTLE).
Shouldn't arch/arm/boot/dts/sun9i-a80.dtsi stick to this convention?
The scripts to create the uImage and to reproduce the problem are in https://github.com/xypron/kernel-optimusboard/tree/35d06c020f6584b5023e0e4bef67cc5a625f65bb
Best regards
Heinrich Schuchardt
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