forked from Minki/linux
a2797beadf
When booting with device-tree the function pointer for detecting context loss is not populated. Ideally, the pm_runtime framework should be enhanced to allow a means for reporting context/state loss and we could avoid populating such function pointers altogether. In the interim until a generic non-device specific solution is in place, force a restore of the gpio bank when enabling the gpio controller. Adds a new device-tree property for the OMAP GPIO controller to indicate if the GPIO controller is located in a power-domain that never loses power and hence will always maintain its logic state. Signed-off-by: Jon Hunter <jon-hunter@ti.com> Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Reviewed-by: Kevin Hilman <khilman@linaro.org> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
40 lines
1.2 KiB
Plaintext
40 lines
1.2 KiB
Plaintext
OMAP GPIO controller bindings
|
|
|
|
Required properties:
|
|
- compatible:
|
|
- "ti,omap2-gpio" for OMAP2 controllers
|
|
- "ti,omap3-gpio" for OMAP3 controllers
|
|
- "ti,omap4-gpio" for OMAP4 controllers
|
|
- #gpio-cells : Should be two.
|
|
- first cell is the pin number
|
|
- second cell is used to specify optional parameters (unused)
|
|
- gpio-controller : Marks the device node as a GPIO controller.
|
|
- #interrupt-cells : Should be 2.
|
|
- interrupt-controller: Mark the device node as an interrupt controller
|
|
The first cell is the GPIO number.
|
|
The second cell is used to specify flags:
|
|
bits[3:0] trigger type and level flags:
|
|
1 = low-to-high edge triggered.
|
|
2 = high-to-low edge triggered.
|
|
4 = active high level-sensitive.
|
|
8 = active low level-sensitive.
|
|
|
|
OMAP specific properties:
|
|
- ti,hwmods: Name of the hwmod associated to the GPIO:
|
|
"gpio<X>", <X> being the 1-based instance number
|
|
from the HW spec.
|
|
- ti,gpio-always-on: Indicates if a GPIO bank is always powered and
|
|
so will never lose its logic state.
|
|
|
|
|
|
Example:
|
|
|
|
gpio4: gpio4 {
|
|
compatible = "ti,omap4-gpio";
|
|
ti,hwmods = "gpio4";
|
|
#gpio-cells = <2>;
|
|
gpio-controller;
|
|
#interrupt-cells = <2>;
|
|
interrupt-controller;
|
|
};
|