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[PATCH 1/2] gpio: mmio: add support for NI 169445 NAND GPIO

To: <linus.walleij@linaro.org>, <gnurou@gmail.com>, <mark.rutland@arm.com>, <devicetree@vger.kernel.org>, <robh+dt@kernel.org>, <ralf@linux-mips.org>
Subject: [PATCH 1/2] gpio: mmio: add support for NI 169445 NAND GPIO
From: Nathan Sullivan <nathan.sullivan@ni.com>
Date: Mon, 6 Mar 2017 14:06:00 -0600
Cc: <linux-kernel@vger.kernel.org>, <linux-gpio@vger.kernel.org>, <linux-mips@linux-mips.org>, Nathan Sullivan <nathan.sullivan@ni.com>
In-reply-to: <1488830761-681-1-git-send-email-nathan.sullivan@ni.com>
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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>
---
 .../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);
-- 
2.1.4


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