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led: implement LED boot API

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Implement LED boot API to signal correct boot of the system.

led_boot_on/off/blink() are introduced to turn ON, OFF and BLINK the
designated boot LED.

New Kconfig is introduced, CONFIG_LED_BOOT to enable the feature.
This makes use of the /options/u-boot property "boot-led" to the
define the boot LED.
It's also introduced a new /options/u-boot property "boot-led-period"
to define the default period when the LED is set to blink mode.

If "boot-led-period" is not defined, the value of 250 (ms) is
used by default.

If CONFIG_LED_BLINK or CONFIG_LED_SW_BLINK is not enabled,
led_boot_blink call will fallback to simple LED ON.

To cache the data we repurpose the now unused led_uc_priv for storage of
global LED uclass info.

Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Christian Marangi
2024-10-01 14:24:36 +02:00
committed by Tom Rini
parent 30f6ea5138
commit 914fd75a5d
3 changed files with 149 additions and 2 deletions
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55
include/led.h
View File

@@ -9,6 +9,7 @@
#include <stdbool.h>
#include <cyclic.h>
#include <dm/ofnode.h>
struct udevice;
@@ -52,10 +53,15 @@ struct led_uc_plat {
/**
* struct led_uc_priv - Private data the uclass stores about each device
*
* @period_ms: Flash period in milliseconds
* @boot_led_label: Boot LED label
* @boot_led_dev: Boot LED dev
* @boot_led_period: Boot LED blink period
*/
struct led_uc_priv {
int period_ms;
#ifdef CONFIG_LED_BOOT
const char *boot_led_label;
int boot_led_period;
#endif
};
struct led_ops {
@@ -141,4 +147,49 @@ int led_sw_set_period(struct udevice *dev, int period_ms);
bool led_sw_is_blinking(struct udevice *dev);
bool led_sw_on_state_change(struct udevice *dev, enum led_state_t state);
#ifdef CONFIG_LED_BOOT
/**
* led_boot_on() - turn ON the designated LED for booting
*
* Return: 0 if OK, -ve on error
*/
int led_boot_on(void);
/**
* led_boot_off() - turn OFF the designated LED for booting
*
* Return: 0 if OK, -ve on error
*/
int led_boot_off(void);
#if defined(CONFIG_LED_BLINK) || defined(CONFIG_LED_SW_BLINK)
/**
* led_boot_blink() - turn ON the designated LED for booting
*
* Return: 0 if OK, -ve on error
*/
int led_boot_blink(void);
#else
/* If LED BLINK is not supported/enabled, fallback to LED ON */
#define led_boot_blink led_boot_on
#endif
#else
static inline int led_boot_on(void)
{
return -ENOSYS;
}
static inline int led_boot_off(void)
{
return -ENOSYS;
}
static inline int led_boot_blink(void)
{
return -ENOSYS;
}
#endif
#endif