Re: [PATCH v2 1/3] dt-bindings: display: panel: Add Samsung S6E8FCO

[Yedaya Katsman]

On Thu, 26 Feb 2026 at 15:42, Konrad Dybcio
<konrad.dybcio@xxxxxxxxxxxxxxxx> wrote:
>
> On 2/26/26 7:55 AM, Krzysztof Kozlowski wrote:
> > On 25/02/2026 21:03, Yedaya Katsman wrote:
> >> On Wed, 25 Feb 2026 at 17:45, Krzysztof Kozlowski <krzk@xxxxxxxxxx> wrote:
> >>>
> >>> On 25/02/2026 16:29, Yedaya Katsman wrote:
> >>>>>> +  vddio-supply: true
> >>>>>> +  ldo-supply: true
> >>>>>
> >>>>> LDO is the name of the type of regulator. Why is it called as name of
> >>>>> the supply?
> >>>> Can you explain more what you mean? Do you mean to change the name of
> >>>> the property? It seems that all the regulator properties are named
> >>>> foo-supply.
> >>>
> >>> I just have doubts that the device has supplied called LDO, considering
> >>> what LDO means.
> >> OK. I don't really have a way to verify if it's true, all I have is
> >> the downstream dts
> >> which calls it LDO [0]
> >>
> >> [0] https://github.com/MiCode/Xiaomi_Kernel_OpenSource/blob/d3766fc8cda2d96de2850faa9ce58e5a37ea9f9c/arch/arm64/boot/dts/qcom/trinket-sde-display.dtsi#L24-L36
> >
> > Obviously the regulator is LDO, so they called it. Most of the
> > regulators are LDO, so why VDD IN is not called LDO?
> >
> > This is name of the supply in this device.
>
> Yedaya, in case you didn't catch it, LDO is an acronym:
>
> https://en.wikipedia.org/wiki/Low-dropout_regulator
>
> The vendor driver probably calls it that, because the input leg of
> the panel's driver IC just so happens to be connected to a regulator
> of this kind
>
> If we don't know the actual name of that input and have no way to verify
> it, I think 'power-supply' would be a good generic consensus, it happens
> to be reasonably common across other bindings
Thanks for further explaining. I managed to find the schematic (Thanks to
Kamil finding it first and making me look for it)[0]. It seems that
this specifically is
VDDI supply regulator, while the one called iovcc in the dts is
actually a VCI regulator.
The vddio-supply is called VREG_L9_LVS and connects to the output of the vddi
regulator.

My current plan is to call them vddi-supply and vci-supply in the
binding, but I'm not sure
what to call what's currently vddio-supply.

[0] https://androidfreefile.com/wp-content/uploads/Xiaomi_Mi_A3_Schematic.pdf
> Konrad

Thanks, Yedaya