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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>
This commit is contained in:
Nathan Sullivan 2017-03-14 11:13:22 -05:00 committed by Linus Walleij
parent d8307c0920
commit b8c90199b5
2 changed files with 39 additions and 0 deletions
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38
Documentation/devicetree/bindings/gpio/ni,169445-nand-gpio.txt Normal file
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@ -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;
};

1
drivers/gpio/gpio-mmio.c
View File

@ -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);