Messages in this thread | | | Subject | Re: [RFC PATCH v1 6/6] soc/tegra: regulators: Add regulators coupler for Tegra30 | From | Dmitry Osipenko <> | Date | Wed, 8 May 2019 16:27:42 +0300 |
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08.05.2019 10:58, Mark Brown пишет: > On Sun, Apr 14, 2019 at 08:59:39PM +0300, Dmitry Osipenko wrote: >> Add regulators coupler for Tegra30 SoC's that performs voltage balancing >> of a coupled regulators and thus provides voltage scaling functionality. > > Same here, what are the requirements this is implementing? >
There are two coupled regulators: CPU and CORE.
Constraints:
1) The max-spread voltage is 300mV.
2) CORE voltage must be higher than the CPU by at least N mV, where N varies depending on the CPU voltage.
3) There is a constraint on the maximum CORE voltage depending on hardware model/revision (cpu_speedo_id) where a higher voltages apparently may cause physical damage, so it's better to hardcode the limitation in the code rather than to rely on a board's device-tree description. This constraint is quite vaguely defined in the downstream kernel, I'm not really sure if it's solely about the hardware safety.
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