summaryrefslogtreecommitdiffstats
path: root/Documentation/devicetree/bindings/gpio/gpio.txt
diff options
context:
space:
mode:
Diffstat (limited to 'Documentation/devicetree/bindings/gpio/gpio.txt')
-rw-r--r--Documentation/devicetree/bindings/gpio/gpio.txt78
1 files changed, 0 insertions, 78 deletions
diff --git a/Documentation/devicetree/bindings/gpio/gpio.txt b/Documentation/devicetree/bindings/gpio/gpio.txt
deleted file mode 100644
index 4e16ba4..0000000
--- a/Documentation/devicetree/bindings/gpio/gpio.txt
+++ /dev/null
@@ -1,78 +0,0 @@
-Specifying GPIO information for devices
-============================================
-
-1) gpios property
------------------
-
-Nodes that makes use of GPIOs should specify them using one or more
-properties, each containing a 'gpio-list':
-
- gpio-list ::= <single-gpio> [gpio-list]
- single-gpio ::= <gpio-phandle> <gpio-specifier>
- gpio-phandle : phandle to gpio controller node
- gpio-specifier : Array of #gpio-cells specifying specific gpio
- (controller specific)
-
-GPIO properties should be named "[<name>-]gpios". Exact
-meaning of each gpios property must be documented in the device tree
-binding for each device.
-
-For example, the following could be used to describe gpios pins to use
-as chip select lines; with chip selects 0, 1 and 3 populated, and chip
-select 2 left empty:
-
- gpio1: gpio1 {
- gpio-controller
- #gpio-cells = <2>;
- };
- gpio2: gpio2 {
- gpio-controller
- #gpio-cells = <1>;
- };
- [...]
- chipsel-gpios = <&gpio1 12 0>,
- <&gpio1 13 0>,
- <0>, /* holes are permitted, means no GPIO 2 */
- <&gpio2 2>;
-
-Note that gpio-specifier length is controller dependent. In the
-above example, &gpio1 uses 2 cells to specify a gpio, while &gpio2
-only uses one.
-
-gpio-specifier may encode: bank, pin position inside the bank,
-whether pin is open-drain and whether pin is logically inverted.
-Exact meaning of each specifier cell is controller specific, and must
-be documented in the device tree binding for the device.
-
-Example of the node using GPIOs:
-
- node {
- gpios = <&qe_pio_e 18 0>;
- };
-
-In this example gpio-specifier is "18 0" and encodes GPIO pin number,
-and empty GPIO flags as accepted by the "qe_pio_e" gpio-controller.
-
-2) gpio-controller nodes
-------------------------
-
-Every GPIO controller node must both an empty "gpio-controller"
-property, and have #gpio-cells contain the size of the gpio-specifier.
-
-Example of two SOC GPIO banks defined as gpio-controller nodes:
-
- qe_pio_a: gpio-controller@1400 {
- #gpio-cells = <2>;
- compatible = "fsl,qe-pario-bank-a", "fsl,qe-pario-bank";
- reg = <0x1400 0x18>;
- gpio-controller;
- };
-
- qe_pio_e: gpio-controller@1460 {
- #gpio-cells = <2>;
- compatible = "fsl,qe-pario-bank-e", "fsl,qe-pario-bank";
- reg = <0x1460 0x18>;
- gpio-controller;
- };
-
-