Messages in this thread | | | From | Chen-Yu Tsai <> | Date | Mon, 14 Aug 2017 15:56:27 +0800 | Subject | Re: [linux-sunxi] [PATCH v2] arm64: allwinner: a64: Add A64-OLinuXino initial support |
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On Mon, Aug 14, 2017 at 3:34 PM, Jagan Teki <jagannadh.teki@gmail.com> wrote: > On Mon, Aug 14, 2017 at 12:38 PM, Chen-Yu Tsai <wens@csie.org> wrote: >> Hi, >> >> On Sun, Aug 13, 2017 at 1:54 AM, Jagan Teki <jagannadh.teki@gmail.com> wrote: >>> From: Jagan Teki <jagan@amarulasolutions.com> >>> >>> OLimex A64-OLinuXino is an open-source hardware board >>> using the Allwinner A64 SOC. >>> >>> OLimex A64-OLinuXino has >>> - A64 Quad-core Cortex-A53 64bit >>> - 1GB or 2GB RAM DDR3L @ 672Mhz >>> - microSD slot and 4/8/16GB eMMC >>> - Debug TTL UART >>> - HDMI >>> - LCD >>> - IR receiver >>> - 5V DC power supply >> >> Have you tried out Ethernet? > > Not, tested yet. Will send separate patch.
OK.
[...]
>>> + >>> +®_aldo2 { >>> + regulator-always-on; >>> + regulator-min-microvolt = <3300000>; >>> + regulator-max-microvolt = <3300000>; >> >> Schematic says 1.8V? > > I saw ALD02 VCC-PL=3.3v on schematic.
Ah. I see they changed it in a rev. B. Lets use 3.3V then.
>> >>> + regulator-name = "vcc-pl"; >>> +}; >>> + >>> +®_aldo3 { >>> + regulator-always-on; >>> + regulator-min-microvolt = <3000000>; >>> + regulator-max-microvolt = <3000000>; >>> + regulator-name = "vcc-pll-avcc"; >>> +}; >>> + >>> +®_dcdc1 { >>> + regulator-always-on; >>> + regulator-min-microvolt = <3300000>; >>> + regulator-max-microvolt = <3300000>; >>> + regulator-name = "vcc-3v3"; >>> +}; >>> + >>> +®_dcdc2 { >>> + regulator-always-on; >>> + regulator-min-microvolt = <1100000>; >>> + regulator-max-microvolt = <1100000>; >> >> The SoC has a wider range than a fixed voltage for the CPUs. > > So, max 1.1v can't enough CPUs? thought similar behavior with pine64?
The recommended operating conditions says 1.04 ~ 1.3 V for CPUx, while the typical voltage is 1.1V. The regulator constraints should match the datasheet, especially for power rails that are involved in DVFS.
ChenYu
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