1 files changed, 94 insertions, 25 deletions

diff --git a/Documentation/devicetree/bindings/pinctrl/samsung-pinctrl.txt b/Documentation/devicetree/bindings/pinctrl/samsung-pinctrl.txt
index 03dee50532f5..e97a27856b21 100644
--- a/Documentation/devicetree/bindings/pinctrl/samsung-pinctrl.txt
+++ b/Documentation/devicetree/bindings/pinctrl/samsung-pinctrl.txt
@@ -8,13 +8,20 @@ on-chip controllers onto these pads.
 Required Properties:
 - compatible: should be one of the following.
   - "samsung,pinctrl-exynos4210": for Exynos4210 compatible pin-controller.
+  - "samsung,pinctrl-exynos4x12": for Exynos4x12 compatible pin-controller.
   - "samsung,pinctrl-exynos5250": for Exynos5250 compatible pin-controller.
 
 - reg: Base address of the pin controller hardware module and length of
   the address space it occupies.
 
-- interrupts: interrupt specifier for the controller. The format and value of
-  the interrupt specifier depends on the interrupt parent for the controller.
+- Pin banks as child nodes: Pin banks of the controller are represented by child
+  nodes of the controller node. Bank name is taken from name of the node. Each
+  bank node must contain following properties:
+
+  - gpio-controller: identifies the node as a gpio controller and pin bank.
+  - #gpio-cells: number of cells in GPIO specifier. Since the generic GPIO
+    binding is used, the amount of cells must be specified as 2. See generic
+    GPIO binding documentation for description of particular cells.
 
 - Pin mux/config groups as child nodes: The pin mux (selecting pin function
   mode) and pin config (pull up/down, driver strength) settings are represented
@@ -72,16 +79,24 @@ used as system wakeup events.
 A. External GPIO Interrupts: For supporting external gpio interrupts, the
    following properties should be specified in the pin-controller device node.
 
-- interrupt-controller: identifies the controller node as interrupt-parent.
-- #interrupt-cells: the value of this property should be 2.
-  - First Cell: represents the external gpio interrupt number local to the
-    external gpio interrupt space of the controller.
-  - Second Cell: flags to identify the type of the interrupt
-    - 1 = rising edge triggered
-    - 2 = falling edge triggered
-    - 3 = rising and falling edge triggered
-    - 4 = high level triggered
-    - 8 = low level triggered
+   - interrupt-parent: phandle of the interrupt parent to which the external
+     GPIO interrupts are forwarded to.
+   - interrupts: interrupt specifier for the controller. The format and value of
+     the interrupt specifier depends on the interrupt parent for the controller.
+
+   In addition, following properties must be present in node of every bank
+   of pins supporting GPIO interrupts:
+
+   - interrupt-controller: identifies the controller node as interrupt-parent.
+   - #interrupt-cells: the value of this property should be 2.
+     - First Cell: represents the external gpio interrupt number local to the
+       external gpio interrupt space of the controller.
+     - Second Cell: flags to identify the type of the interrupt
+       - 1 = rising edge triggered
+       - 2 = falling edge triggered
+       - 3 = rising and falling edge triggered
+       - 4 = high level triggered
+       - 8 = low level triggered
 
 B. External Wakeup Interrupts: For supporting external wakeup interrupts, a
    child node representing the external wakeup interrupt controller should be
@@ -94,6 +109,11 @@ B. External Wakeup Interrupts: For supporting external wakeup interrupts, a
        found on Samsung Exynos4210 SoC.
    - interrupt-parent: phandle of the interrupt parent to which the external
      wakeup interrupts are forwarded to.
+   - interrupts: interrupt used by multiplexed wakeup interrupts.
+
+   In addition, following properties must be present in node of every bank
+   of pins supporting wake-up interrupts:
+
    - interrupt-controller: identifies the node as interrupt-parent.
    - #interrupt-cells: the value of this property should be 2
      - First Cell: represents the external wakeup interrupt number local to
@@ -105,11 +125,63 @@ B. External Wakeup Interrupts: For supporting external wakeup interrupts, a
        - 4 = high level triggered
        - 8 = low level triggered
 
+   Node of every bank of pins supporting direct wake-up interrupts (without
+   multiplexing) must contain following properties:
+
+   - interrupt-parent: phandle of the interrupt parent to which the external
+     wakeup interrupts are forwarded to.
+   - interrupts: interrupts of the interrupt parent which are used for external
+     wakeup interrupts from pins of the bank, must contain interrupts for all
+     pins of the bank.
+
 Aliases:
 
 All the pin controller nodes should be represented in the aliases node using
 the following format 'pinctrl{n}' where n is a unique number for the alias.
 
+Example: A pin-controller node with pin banks:
+
+        pinctrl_0: pinctrl@11400000 {
+                compatible = "samsung,pinctrl-exynos4210";
+                reg = <0x11400000 0x1000>;
+                interrupts = <0 47 0>;
+
+                /* ... */
+
+                /* Pin bank without external interrupts */
+                gpy0: gpy0 {
+                        gpio-controller;
+                        #gpio-cells = <2>;
+                };
+
+                /* ... */
+
+                /* Pin bank with external GPIO or muxed wake-up interrupts */
+                gpj0: gpj0 {
+                        gpio-controller;
+                        #gpio-cells = <2>;
+
+                        interrupt-controller;
+                        #interrupt-cells = <2>;
+                };
+
+                /* ... */
+
+                /* Pin bank with external direct wake-up interrupts */
+                gpx0: gpx0 {
+                        gpio-controller;
+                        #gpio-cells = <2>;
+
+                        interrupt-controller;
+                        interrupt-parent = <&gic>;
+                        interrupts = <0 16 0>, <0 17 0>, <0 18 0>, <0 19 0>,
+                                     <0 20 0>, <0 21 0>, <0 22 0>, <0 23 0>;
+                        #interrupt-cells = <2>;
+                };
+
+                /* ... */
+        };
+
 Example 1: A pin-controller node with pin groups.
 
         pinctrl_0: pinctrl@11400000 {
@@ -117,6 +189,8 @@ Example 1: A pin-controller node with pin groups.
                 reg = <0x11400000 0x1000>;
                 interrupts = <0 47 0>;
 
+                /* ... */
+
                 uart0_data: uart0-data {
                         samsung,pins = "gpa0-0", "gpa0-1";
                         samsung,pin-function = <2>;
@@ -158,20 +232,14 @@ Example 2: A pin-controller node with external wakeup interrupt controller node.
         pinctrl_1: pinctrl@11000000 {
                 compatible = "samsung,pinctrl-exynos4210";
                 reg = <0x11000000 0x1000>;
-                interrupts = <0 46 0>;
-                interrupt-controller;
-                #interrupt-cells = <2>;
+                interrupts = <0 46 0>
 
-                wakup_eint: wakeup-interrupt-controller {
+                /* ... */
+
+                wakeup-interrupt-controller {
                         compatible = "samsung,exynos4210-wakeup-eint";
                         interrupt-parent = <&gic>;
-                        interrupt-controller;
-                        #interrupt-cells = <2>;
-                        interrupts = <0 16 0>, <0 17 0>, <0 18 0>, <0 19 0>,
-                                        <0 20 0>, <0 21 0>, <0 22 0>, <0 23 0>,
-                                        <0 24 0>, <0 25 0>, <0 26 0>, <0 27 0>,
-                                        <0 28 0>, <0 29 0>, <0 30 0>, <0 31 0>,
-                                        <0 32 0>;
+                        interrupts = <0 32 0>;
                 };
         };
 
@@ -190,7 +258,8 @@ Example 4: Set up the default pin state for uart controller.
 
         static int s3c24xx_serial_probe(struct platform_device *pdev) {
                 struct pinctrl *pinctrl;
-                ...
-                ...
+
+                /* ... */
+
                 pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
         }