[PATCH] gpio: mmio: add support for NI 169445 NAND GPIO
From: Nathan Sullivan <hidden>
Date: 2016-12-02 15:37:17
Also in:
linux-gpio, lkml
Subsystem:
gpio subsystem, open firmware and flattened device tree bindings, the rest · Maintainers:
Linus Walleij, Bartosz Golaszewski, Rob Herring, Krzysztof Kozlowski, Conor Dooley, Linus Torvalds
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 <redacted> --- "devicetree: add vendor prefix for National Instruments" added the ni vendor prefix. This patch is needed for "MIPS: NI 169445 board support", so that GPIO NAND can work. .../bindings/gpio/ni,169445-nand-gpio.txt | 36 ++++++++++++++++++++++ drivers/gpio/gpio-mmio.c | 1 + 2 files changed, 37 insertions(+) create mode 100644 Documentation/devicetree/bindings/gpio/ni,169445-nand-gpio.txt
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
index 0000000..ca2c14f
--- /dev/null
+++ b/Documentation/devicetree/bindings/gpio/ni,169445-nand-gpio.txt@@ -0,0 +1,36 @@ +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. + +Examples: + gpio1: nand-gpio-out@1f300010 { + compatible = "ni,169445-nand-gpio"; + reg = <0x1f300010 0x4>; + reg-names = "dat"; + gpio-controller; + #gpio-cells = <2>; + ngpios = <5>; + }; + + gpio2: nand-gpio-in@1f300014 { + compatible = "ni,169445-nand-gpio"; + reg = <0x1f300014 0x4>; + reg-names = "dat"; + gpio-controller; + #gpio-cells = <2>; + ngpios = <1>; + };
diff --git a/drivers/gpio/gpio-mmio.c b/drivers/gpio/gpio-mmio.c
index d7d03ad..f7da40e 100644
--- 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);
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2.1.4