new file mode 100644
@@ -0,0 +1,19 @@
+MOXA ART GPIO Controller
+
+Required properties:
+
+- #gpio-cells : Should be 2, The first cell is the pin number,
+ the second cell is used to specify polarity:
+ 0 = active high
+ 1 = active low
+- compatible : Must be "moxa,moxart-gpio"
+- reg : Should contain registers location and length
+
+Example:
+
+ gpio: gpio@98700000 {
+ gpio-controller;
+ #gpio-cells = <2>;
+ compatible = "moxa,moxart-gpio";
+ reg = <0x98700000 0xC>;
+ };
@@ -156,6 +156,13 @@ config GPIO_F7188X
To compile this driver as a module, choose M here: the module will
be called f7188x-gpio.
+config GPIO_MOXART
+ bool "MOXART GPIO support"
+ depends on ARCH_MOXART
+ help
+ Select this option to enable GPIO driver for
+ MOXA ART SoC devices.
+
config GPIO_MPC5200
def_bool y
depends on PPC_MPC52xx
@@ -46,6 +46,7 @@ obj-$(CONFIG_GPIO_MC9S08DZ60) += gpio-mc9s08dz60.o
obj-$(CONFIG_GPIO_MCP23S08) += gpio-mcp23s08.o
obj-$(CONFIG_GPIO_ML_IOH) += gpio-ml-ioh.o
obj-$(CONFIG_GPIO_MM_LANTIQ) += gpio-mm-lantiq.o
+obj-$(CONFIG_GPIO_MOXART) += gpio-moxart.o
obj-$(CONFIG_GPIO_MPC5200) += gpio-mpc5200.o
obj-$(CONFIG_GPIO_MPC8XXX) += gpio-mpc8xxx.o
obj-$(CONFIG_GPIO_MSIC) += gpio-msic.o
new file mode 100644
@@ -0,0 +1,142 @@
+/*
+ * MOXA ART SoCs GPIO driver.
+ *
+ * Copyright (C) 2013 Jonas Jensen
+ *
+ * Jonas Jensen <jonas.jensen@gmail.com>
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/irq.h>
+#include <linux/io.h>
+#include <linux/gpio.h>
+#include <linux/platform_device.h>
+#include <linux/module.h>
+#include <linux/of_address.h>
+#include <linux/of_gpio.h>
+#include <linux/pinctrl/consumer.h>
+#include <linux/delay.h>
+#include <linux/timer.h>
+#include <linux/bitops.h>
+
+#define GPIO_DATA_OUT 0x00
+#define GPIO_DATA_IN 0x04
+#define GPIO_PIN_DIRECTION 0x08
+
+static void __iomem *moxart_gpio_base;
+
+static int moxart_gpio_request(struct gpio_chip *chip, unsigned offset)
+{
+ return pinctrl_request_gpio(offset);
+}
+
+static void moxart_gpio_free(struct gpio_chip *chip, unsigned offset)
+{
+ pinctrl_free_gpio(offset);
+}
+
+static int moxart_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
+{
+ void __iomem *ioaddr = moxart_gpio_base + GPIO_PIN_DIRECTION;
+
+ writel(readl(ioaddr) & ~BIT(offset), ioaddr);
+ return 0;
+}
+
+static int moxart_gpio_direction_output(struct gpio_chip *chip,
+ unsigned offset, int value)
+{
+ void __iomem *ioaddr = moxart_gpio_base + GPIO_PIN_DIRECTION;
+
+ writel(readl(ioaddr) | BIT(offset), ioaddr);
+ return 0;
+}
+
+static void moxart_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
+{
+ void __iomem *ioaddr = moxart_gpio_base + GPIO_DATA_OUT;
+ u32 reg = readl(ioaddr);
+
+ if (value)
+ reg = reg | BIT(offset);
+ else
+ reg = reg & ~BIT(offset);
+
+
+ writel(reg, ioaddr);
+}
+
+static int moxart_gpio_get(struct gpio_chip *chip, unsigned offset)
+{
+ u32 ret = readl(moxart_gpio_base + GPIO_PIN_DIRECTION);
+
+ if (ret & BIT(offset))
+ return !!(readl(moxart_gpio_base + GPIO_DATA_OUT) &
+ BIT(offset));
+ else
+ return !!(readl(moxart_gpio_base + GPIO_DATA_IN) &
+ BIT(offset));
+}
+
+static struct gpio_chip moxart_gpio_chip = {
+ .label = "moxart-gpio",
+ .request = moxart_gpio_request,
+ .free = moxart_gpio_free,
+ .direction_input = moxart_gpio_direction_input,
+ .direction_output = moxart_gpio_direction_output,
+ .set = moxart_gpio_set,
+ .get = moxart_gpio_get,
+ .base = 0,
+ .ngpio = 32,
+ .can_sleep = 0,
+};
+
+static int moxart_gpio_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct resource *res;
+ int ret;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ moxart_gpio_base = devm_ioremap_resource(dev, res);
+ if (IS_ERR(moxart_gpio_base)) {
+ dev_err(dev, "%s: devm_ioremap_resource res_gpio failed\n",
+ dev->of_node->full_name);
+ return PTR_ERR(moxart_gpio_base);
+ }
+
+ moxart_gpio_chip.dev = dev;
+
+ ret = gpiochip_add(&moxart_gpio_chip);
+ if (ret) {
+ dev_err(dev, "%s: gpiochip_add failed\n",
+ dev->of_node->full_name);
+ return ret;
+ }
+
+ return 0;
+}
+
+static const struct of_device_id moxart_gpio_match[] = {
+ { .compatible = "moxa,moxart-gpio" },
+ { }
+};
+
+static struct platform_driver moxart_gpio_driver = {
+ .driver = {
+ .name = "moxart-gpio",
+ .owner = THIS_MODULE,
+ .of_match_table = moxart_gpio_match,
+ },
+ .probe = moxart_gpio_probe,
+};
+module_platform_driver(moxart_gpio_driver);
+
+MODULE_DESCRIPTION("MOXART GPIO chip driver");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Jonas Jensen <jonas.jensen@gmail.com>");
Add GPIO driver for MOXA ART SoCs. Signed-off-by: Jonas Jensen <jonas.jensen@gmail.com> --- Notes: Thanks for reviewing! v5 writes to "pincontrol" are not needed, the pins work regardless. I took notes probing the pins with a multimeter, and I don't know the proper place for it, so I'm attaching the text here: GPIOs on the UC-7112-LX base board can be found at "JP2", this is a 2x10 hole through area that comes without header pins. The holes can be used to measure and test GPIOs. A header could theoretically be soldered in. "JP2" is described with the following PCB print: |PIO1|PIO3|PIO5|PIO7|PIO9|NC|NC|NC|GND|+5V| |PIO0| |PIO4|PIO6|PIO8|NC|NC|NC|GND|+5V| PIO2 (no text / PIO2) to PIO9 were verified working. PIO0, PIO1 could not be verified. The driver adds support for 32 pins via the register at 0x98700000, the following GPIO numbers (corresponding pins on the right) were tested and verified: 05: RTC SCLK 06: RTC DATA 07: RTC RESET 12: (no text / PIO2) 13: PIO3 14: PIO4 15: PIO5 16: PIO6 17: PIO7 18: PIO8 19: PIO9 24: HCM1206EN buzzer 25: reset button 27: ready LED GPIOs that can be set from sysfs are: 1. GPIO 12-19 (measures 0V / 3.3V respectively) 2. GPIO 24, 27 GPIOs that can be "seen": 1. GPIO 25 Thanks for telling me about drivers/input/keyboard/gpio_keys_polled.c, it works, events are triggered on reset "key" and print to console, the relevant DT parts are: leds { compatible = "gpio-leds"; user-led { label = "ready-led"; gpios = <&gpio 27 0x1>; default-state = "on"; linux,default-trigger = "default-on"; }; }; gpio_keys_polled { compatible = "gpio-keys-polled"; #address-cells = <1>; #size-cells = <0>; poll-interval = <500>; button@25 { label = "GPIO Reset"; linux,code = <116>; gpios = <&gpio 25 1>; }; }; Changes since v5: 1. remove pincontrol register 2. update DT binding and example Applies to next-20131128 .../devicetree/bindings/gpio/moxa,moxart-gpio.txt | 19 +++ drivers/gpio/Kconfig | 7 + drivers/gpio/Makefile | 1 + drivers/gpio/gpio-moxart.c | 142 +++++++++++++++++++++ 4 files changed, 169 insertions(+) create mode 100644 Documentation/devicetree/bindings/gpio/moxa,moxart-gpio.txt create mode 100644 drivers/gpio/gpio-moxart.c