Re: [PATCH v3 2/3] power: supply: Add bd718(15/28/78) charger driver

Matti Vaittinen
2025-08-29T12:27:22Z

On 29/08/2025 09:35, Matti Vaittinen wrote:

>> Some of these look like they should immediately shut down the
>> system, I suppose the battery charger does this autonomously
>> but it should probably also trigger an emergency shutdown
>> of Linux, right?
>
> Yes. The shutdown for charging, or, in some cases for all power outputs,
> is automatically handled by the PMIC hardware. (Well, I am not sure
> about the 'over-current' IRQ, will see if I can find out more about it).

Just to conclude this - I got a confirmation from the ROHM hardware
engineers that exceeding the set limit and causing the over-current and
the coulomb counter monitoring interrupts do not change the hardware
charging state. [CC_MON and OCUR events in the data sheet, if someone
has that ;) ].

The CC_MON1 will however cause a change in the charging LED state. Eg,
exceeding this limit will turn off the AMBLED and turn on the GRNLED -
when the LEDs are controlled by the HW state machine. (I have some very
faint memory that the LEDs could also be forced ON by software). I
suppose the reason for this is that the CC_MON1 was designed to be used
as a "coulomb counter near full capacity" alarm.

Yours,
-- Matti