[ARM] orion5x: D-link DNS-323 revision A1 power LED

This patch fixes the power LED on DNS-323 revision A1, and adds timer
support for (hopefully) both A1 and B1 revisions.

Power LED on revision A1 is active low and also requires GPIO 4 to be
low to work.

Tested on my DNS-323 revision A1.

I have set the default trigger to timer as that replicates the
behaviour of the original firmware, userspace can change the trigger
at the end of the boot process providing a useful indication that
booting has completed.

Signed-off-by: Nicolas Pitre <nico@marvell.com>

1 files changed, 33 insertions, 3 deletions

diff --git a/arch/arm/mach-orion5x/dns323-setup.c b/arch/arm/mach-orion5x/dns323-setup.c
index 8f159db4d08a..421b82f7c63d 100644
--- a/arch/arm/mach-orion5x/dns323-setup.c
+++ b/arch/arm/mach-orion5x/dns323-setup.c
@@ -34,7 +34,8 @@
 #define DNS323_GPIO_LED_RIGHT_AMBER     1
 #define DNS323_GPIO_LED_LEFT_AMBER      2
 #define DNS323_GPIO_SYSTEM_UP           3
-#define DNS323_GPIO_LED_POWER           5
+#define DNS323_GPIO_LED_POWER1          4
+#define DNS323_GPIO_LED_POWER2          5
 #define DNS323_GPIO_OVERTEMP            6
 #define DNS323_GPIO_RTC                 7
 #define DNS323_GPIO_POWER_OFF           8
@@ -237,11 +238,31 @@ error_fail:
  * GPIO LEDs (simple - doesn't use hardware blinking support)
  */
 
+#define ORION_BLINK_HALF_PERIOD 100 /* ms */
+
+static int dns323_gpio_blink_set(unsigned gpio,
+        unsigned long *delay_on, unsigned long *delay_off)
+{
+        static int value = 0;
+
+        if (!*delay_on && !*delay_off)
+                *delay_on = *delay_off = ORION_BLINK_HALF_PERIOD;
+
+        if (ORION_BLINK_HALF_PERIOD == *delay_on
+            && ORION_BLINK_HALF_PERIOD == *delay_off) {
+                value = !value;
+                orion_gpio_set_blink(gpio, value);
+                return 0;
+        }
+
+        return -EINVAL;
+}
+
 static struct gpio_led dns323_leds[] = {
         {
                 .name = "power:blue",
-                .gpio = DNS323_GPIO_LED_POWER,
-                .default_state = LEDS_GPIO_DEFSTATE_ON,
+                .gpio = DNS323_GPIO_LED_POWER2,
+                .default_trigger = "timer",
         }, {
                 .name = "right:amber",
                 .gpio = DNS323_GPIO_LED_RIGHT_AMBER,
@@ -256,6 +277,7 @@ static struct gpio_led dns323_leds[] = {
 static struct gpio_led_platform_data dns323_led_data = {
         .num_leds       = ARRAY_SIZE(dns323_leds),
         .leds           = dns323_leds,
+        .gpio_blink_set = dns323_gpio_blink_set,
 };
 
 static struct platform_device dns323_gpio_leds = {
@@ -412,6 +434,14 @@ static void __init dns323_init(void)
         orion5x_setup_dev_boot_win(DNS323_NOR_BOOT_BASE, DNS323_NOR_BOOT_SIZE);
         platform_device_register(&dns323_nor_flash);
 
+        /* The 5181 power LED is active low and requires
+         * DNS323_GPIO_LED_POWER1 to also be low.
+         */
+        if (dns323_dev_id() == MV88F5181_DEV_ID) {
+                dns323_leds[0].active_low = 1;
+                gpio_direction_output(DNS323_GPIO_LED_POWER1, 0);
+        }
+
         platform_device_register(&dns323_gpio_leds);
 
         platform_device_register(&dns323_button_device);