summaryrefslogtreecommitdiffstats
path: root/Documentation/driver-api/gpio
diff options
context:
space:
mode:
authorLinus Walleij <linus.walleij@linaro.org>2020-06-20 22:12:48 +0200
committerLinus Walleij <linus.walleij@linaro.org>2020-07-07 13:52:33 +0200
commit8cbdc5045df071b146b76a718dd8669e89714057 (patch)
tree0037a0b845493e9922a74a428e0a56252c036d29 /Documentation/driver-api/gpio
parentb239e4454e59bc85d466eb5630da46f6a876df77 (diff)
downloadlinux-8cbdc5045df071b146b76a718dd8669e89714057.tar.bz2
gpio: Add gpio-charger to the documentation
The GPIO-based charger is another of the helpful devices built on top of GPIO. Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Cc: Sebastian Reichel <sebastian.reichel@collabora.com> Link: https://lore.kernel.org/r/20200620201248.28843-1-linus.walleij@linaro.org
Diffstat (limited to 'Documentation/driver-api/gpio')
-rw-r--r--Documentation/driver-api/gpio/drivers-on-gpio.rst7
1 files changed, 7 insertions, 0 deletions
diff --git a/Documentation/driver-api/gpio/drivers-on-gpio.rst b/Documentation/driver-api/gpio/drivers-on-gpio.rst
index 820b403d50f6..41ec3cc72d32 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
+ AC charger 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