gpio: mmio: add support for NI 169445 NAND GPIO

The GPIO-based NAND controller on National Instruments 169445 hardware
exposes a set of simple lines for the control signals.

Signed-off-by: Nathan Sullivan <nathan.sullivan@ni.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/Documentation/devicetree/bindings/gpio/ni,169445-nand-gpio.txt b/Documentation/devicetree/bindings/gpio/ni,169445-nand-gpio.txt
new file mode 100644 (file)
index 0000000..ca2f8c7
--- /dev/null
+++ b/Documentation/devicetree/bindings/gpio/ni,169445-nand-gpio.txt
@@ -0,0 +1,38 @@
+Bindings for the National Instruments 169445 GPIO NAND controller
+
+The 169445 GPIO NAND controller has two memory mapped GPIO registers, one
+for input (the ready signal) and one for output (control signals).  It is
+intended to be used with the GPIO NAND driver.
+
+Required properties:
+       - compatible: should be "ni,169445-nand-gpio"
+       - reg-names: must contain
+               "dat" - data register
+       - reg: address + size pairs describing the GPIO register sets;
+               order must correspond with the order of entries in reg-names
+       - #gpio-cells: must be set to 2. The first cell is the pin number and
+                       the second cell is used to specify the gpio polarity:
+                       0 = active high
+                       1 = active low
+       - gpio-controller: Marks the device node as a gpio controller.
+
+Optional properties:
+       - no-output: disables driving output on the pins
+
+Examples:
+       gpio1: nand-gpio-out@1f300010 {
+               compatible = "ni,169445-nand-gpio";
+               reg = <0x1f300010 0x4>;
+               reg-names = "dat";
+               gpio-controller;
+               #gpio-cells = <2>;
+       };
+
+       gpio2: nand-gpio-in@1f300014 {
+               compatible = "ni,169445-nand-gpio";
+               reg = <0x1f300014 0x4>;
+               reg-names = "dat";
+               gpio-controller;
+               #gpio-cells = <2>;
+               no-output;
+       };

diff --git a/drivers/gpio/gpio-mmio.c b/drivers/gpio/gpio-mmio.c
index d7d03ad..f7da40e 100644 (file)
--- a/drivers/gpio/gpio-mmio.c
+++ b/drivers/gpio/gpio-mmio.c
@@ -575,6 +575,7 @@ static void __iomem *bgpio_map(struct platform_device *pdev,
 static const struct of_device_id bgpio_of_match[] = {
        { .compatible = "brcm,bcm6345-gpio" },
        { .compatible = "wd,mbl-gpio" },
+       { .compatible = "ni,169445-nand-gpio" },
        { }
 };
 MODULE_DEVICE_TABLE(of, bgpio_of_match);