Merge commit 'kumar/next' into merge

2 files changed, 69 insertions, 0 deletions

diff --git a/Documentation/powerpc/dts-bindings/gpio/gpio.txt b/Documentation/powerpc/dts-bindings/gpio/gpio.txt
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+++ b/Documentation/powerpc/dts-bindings/gpio/gpio.txt
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+Specifying GPIO information for devices
+============================================
+
+1) gpios property
+-----------------
+
+Nodes that makes use of GPIOs should define them using `gpios' property,
+format of which is: <&gpio-controller1-phandle gpio1-specifier
+                     &gpio-controller2-phandle gpio2-specifier
+                     0 /* holes are permitted, means no GPIO 3 */
+                     &gpio-controller4-phandle gpio4-specifier
+                     ...>;
+
+Note that gpio-specifier length is controller dependent.
+
+gpio-specifier may encode: bank, pin position inside the bank,
+whether pin is open-drain and whether pin is logically inverted.
+
+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 have #gpio-cells property defined,
+this information will be used to translate gpio-specifiers.
+
+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;
+        };
+
+
diff --git a/Documentation/powerpc/dts-bindings/gpio/mdio.txt b/Documentation/powerpc/dts-bindings/gpio/mdio.txt
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+MDIO on GPIOs
+
+Currently defined compatibles:
+- virtual,gpio-mdio
+
+MDC and MDIO lines connected to GPIO controllers are listed in the
+gpios property as described in section VIII.1 in the following order:
+
+MDC, MDIO.
+
+Example:
+
+mdio {
+        compatible = "virtual,mdio-gpio";
+        #address-cells = <1>;
+        #size-cells = <0>;
+        gpios = <&qe_pio_a 11
+                 &qe_pio_c 6>;
+};