drivers: gpio: test driver

Add a dummy driver for the `vnd,gpio` compatible to allow compilation of
drivers utilising GPIO when running "build_all" tests.

Signed-off-by: Jordan Yates <jordan.yates@data61.csiro.au>

drivers/gpio/gpio_test.c

@@ -0,0 +1,98 @@
+/*
+ * Copyright (c) 2021, Commonwealth Scientific and Industrial Research
+ * Organisation (CSIRO) ABN 41 687 119 230.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/*
+ * This is not a real GPIO driver. It is used to instantiate struct
+ * devices for the "vnd,gpio" devicetree compatible used in test code.
+ */
+
+#define DT_DRV_COMPAT vnd_gpio
+
+#include <drivers/gpio.h>
+
+static int vnd_gpio_pin_configure(const struct device *port,
+				  gpio_pin_t pin,
+				  gpio_flags_t flags)
+{
+	return -ENOTSUP;
+}
+
+static int vnd_gpio_port_get_raw(const struct device *port,
+				 gpio_port_value_t *value)
+{
+	return -ENOTSUP;
+}
+
+static int vnd_gpio_port_set_masked_raw(const struct device *port,
+					gpio_port_pins_t mask,
+					gpio_port_value_t value)
+{
+	return -ENOTSUP;
+}
+
+static int vnd_gpio_port_set_bits_raw(const struct device *port,
+				      gpio_port_pins_t pins)
+{
+	return -ENOTSUP;
+}
+
+static int vnd_gpio_port_clear_bits_raw(const struct device *port,
+					gpio_port_pins_t pins)
+{
+	return -ENOTSUP;
+}
+
+static int vnd_gpio_port_toggle_bits(const struct device *port,
+				     gpio_port_pins_t pins)
+{
+	return -ENOTSUP;
+}
+
+static int vnd_gpio_pin_interrupt_configure(const struct device *port,
+					    gpio_pin_t pin,
+					    enum gpio_int_mode mode,
+					    enum gpio_int_trig trig)
+{
+	return -ENOTSUP;
+}
+
+static int vnd_gpio_manage_callback(const struct device *port,
+				    struct gpio_callback *cb,
+				    bool set)
+{
+	return -ENOTSUP;
+}
+
+static uint32_t vnd_gpio_get_pending_int(const struct device *dev)
+{
+	return 0;
+}
+
+static const struct gpio_driver_api vnd_gpio_api = {
+	.pin_configure = vnd_gpio_pin_configure,
+	.port_get_raw = vnd_gpio_port_get_raw,
+	.port_set_masked_raw = vnd_gpio_port_set_masked_raw,
+	.port_set_bits_raw = vnd_gpio_port_set_bits_raw,
+	.port_clear_bits_raw = vnd_gpio_port_clear_bits_raw,
+	.port_toggle_bits = vnd_gpio_port_toggle_bits,
+	.pin_interrupt_configure = vnd_gpio_pin_interrupt_configure,
+	.manage_callback = vnd_gpio_manage_callback,
+	.get_pending_int = vnd_gpio_get_pending_int
+};
+
+static int vnd_gpio_init(const struct device *dev)
+{
+	return 0;
+}
+
+#define VND_GPIO_INIT(n)					  \
+	DEVICE_DT_INST_DEFINE(n, &vnd_gpio_init, NULL,		  \
+			      NULL, NULL, POST_KERNEL,		  \
+			      CONFIG_KERNEL_INIT_PRIORITY_DEVICE, \
+			      &vnd_gpio_api);
+
+DT_INST_FOREACH_STATUS_OKAY(VND_GPIO_INIT)