Re: [PATCH 0/2] qcom_battmgr: Add batteryless DC-adapter MAINS support

[Rakesh Kota]

On Tue, May 19, 2026 at 12:58:06PM +0200, Konrad Dybcio wrote:
> On 5/19/26 8:59 AM, Rakesh Kota wrote:
> > On Mon, May 18, 2026 at 04:36:32PM +0200, Konrad Dybcio wrote:
> >> On 5/18/26 3:49 PM, Rakesh Kota wrote:
> >>> On batteryless boards powered by 12V DC adapters, registering the
> >>> power supply as BATTERY causes userspace to incorrectly trigger
> >>> battery power-saving sequences.
> >>
> >> Does battman really offer no way of differentiating whether a battery
> >> is *actually* present in such cases?
> >>
> >> What boards are affected?
> >>
> > Currently, batteryless support is only implemented for the
> > qcs6490-rb3gen2(Kodiak) board.
> 
> Does the firmware report anything obvious that would point to this not
> being a battery, e.g. design_capacity = 0?
>
No. The firmware identifies the 10k Batt-ID resistor (which mimics a
physical battery) and hardcodes capacity and status values to
ensure boot stability. It does not report 0 capacity, as doing so would
trigger an immediate system shutdown.

regards
Rakesh
> Konrad