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SubjectRe: [PATCH 3/3] arm64: dts: rk3399: Add init voltage for vdd_log
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Markus,


On 2019/11/12 下午4:16, Markus Reichl wrote:
> Hi Kever,
>
> have a rk3399-roc-pc running mainline U-Boot and kernel and vdd_log is
> showing 1118 mV.

The rk3399-roc-pc have the same vdd_log circuit in schematic, so it
should like the patch 1/3 of

this patch set.

I don't understand who is setting this value, maybe the default value
without pwm regulator enabled?

> Is this a danger for the board?
> How to fix it?

The best way is to set correct min/max microvolt of the
regulator(measure with PWM output low and high),

(note that if  no driver touch the regulator, the PWM is default input,
not output;)

and set a init-microvolt for U-Boot driver, and I think no kernel driver
touch this regulator now.


Thanks,

- Kever

> Btw. vin-supply for this pwm-regulator is ignored and I could not find it
> in bindings doc.
>
> Gruß,


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