Hi Linus, On Wed, Jun 10, 2020 at 11:51:24AM +0200, Linus Walleij wrote: > The GPIO-based charger is another of the helpful devices built > on top of GPIO. > > Cc: Sebastian Reichel <sebastian.reichel@xxxxxxxxxxxxx> > Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxx> > --- > Documentation/driver-api/gpio/drivers-on-gpio.rst | 7 +++++++ > 1 file changed, 7 insertions(+) > > diff --git a/Documentation/driver-api/gpio/drivers-on-gpio.rst b/Documentation/driver-api/gpio/drivers-on-gpio.rst > index 820b403d50f6..d85fb748cc52 100644 > --- a/Documentation/driver-api/gpio/drivers-on-gpio.rst > +++ b/Documentation/driver-api/gpio/drivers-on-gpio.rst > @@ -89,6 +89,13 @@ hardware descriptions such as device tree or ACPI: > Consumer Electronics Control bus using only GPIO. It is used to communicate > with devices on the HDMI bus. > > +- gpio-charger: drivers/power/supply/gpio-charger.c is used if you need to do > + battery charging and all you have to go by to check the presence of the > + battery The presence being checked and reported to userspace is for the AC adapter, not the battery. Battery presence is handled by battery driver (e.g. sbs-battery has a detect gpio). > + or more complex tasks such as indicating charging status using > + nothing but GPIO lines, this driver provides that and also a clearly defined > + way to pass the charging parameters from hardware descriptions such as the > + device tree. > + > Apart from this there are special GPIO drivers in subsystems like MMC/SD to > read card detect and write protect GPIO lines, and in the TTY serial subsystem > to emulate MCTRL (modem control) signals CTS/RTS by using two GPIO lines. The Otherwise LGTM. -- Sebastian
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