leds: leds-gpio for ngw100

Add GPIO leds to the NGW100 platform and its defconfig.
Access through /sys/class/leds/{a,b,sys}/* files; one
defaults to a heartbeat.

Signed-off-by: David Brownell <[e-mail]>
Signed-off-by: Richard Purdie <[e-mail]>

arch/avr32/boards/atngw100/setup.c

···
 #include <linux/linkage.h>
 #include <linux/platform_device.h>
 #include <linux/types.h>
+#include <linux/leds.h>
 #include <linux/spi/spi.h>
 
 #include <asm/io.h>
···
 #include <asm/arch/at32ap7000.h>
 #include <asm/arch/board.h>
 #include <asm/arch/init.h>
+#include <asm/arch/portmux.h>
 
 /* Initialized by bootloader-specific startup code. */
 struct tag *bootloader_tags __initdata;
···
 	at32_setup_serial_console(0);
 }
 
+static const struct gpio_led ngw_leds[] = {
+	{ .name = "sys", .gpio = GPIO_PIN_PA(16), .active_low = 1,
+		.default_trigger = "heartbeat",
+	},
+	{ .name = "a", .gpio = GPIO_PIN_PA(19), .active_low = 1, },
+	{ .name = "b", .gpio = GPIO_PIN_PE(19), .active_low = 1, },
+};
+
+static const struct gpio_led_platform_data ngw_led_data = {
+	.num_leds =	ARRAY_SIZE(ngw_leds),
+	.leds =		(void *) ngw_leds,
+};
+
+static struct platform_device ngw_gpio_leds = {
+	.name =		"leds-gpio",
+	.id =		-1,
+	.dev = {
+		.platform_data = (void *) &ngw_led_data,
+	}
+};
+
 static int __init atngw100_init(void)
 {
+	unsigned	i;
+
 	/*
 	 * ATNGW100 uses 16-bit SDRAM interface, so we don't need to
 	 * reserve any pins for it.
···
 	set_hw_addr(at32_add_device_eth(1, &eth_data[1]));
 
 	at32_add_device_spi(0, spi0_board_info, ARRAY_SIZE(spi0_board_info));
+
+	for (i = 0; i < ARRAY_SIZE(ngw_leds); i++) {
+		at32_select_gpio(ngw_leds[i].gpio,
+				AT32_GPIOF_OUTPUT | AT32_GPIOF_HIGH);
+	}
+	platform_device_register(&ngw_gpio_leds);
 
 	return 0;
 }

arch/avr32/configs/atngw100_defconfig

···
 #
 # LED devices
 #
-# CONFIG_NEW_LEDS is not set
+CONFIG_NEW_LEDS=y
+CONFIG_LEDS_CLASS=y
+
+#
+# LED drivers
+#
+CONFIG_LEDS_GPIO=y
+
+#
+# LED Triggers
+#
+CONFIG_LEDS_TRIGGERS=y
+CONFIG_LEDS_TRIGGER_TIMER=y
+CONFIG_LEDS_TRIGGER_HEARTBEAT=y
+
 
 #
 # LED drivers