From: Christian Marangi Date: Tue, 1 Oct 2024 12:24:36 +0000 (+0200) Subject: led: implement LED boot API X-Git-Url: http://git.dujemihanovic.xyz/?a=commitdiff_plain;h=914fd75a5d2f4cfa7828b48abed50a146063d1bd;p=u-boot.git led: implement LED boot API 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 Reviewed-by: Simon Glass --- diff --git a/drivers/led/Kconfig b/drivers/led/Kconfig index bee74b2575..59b007a7ef 100644 --- a/drivers/led/Kconfig +++ b/drivers/led/Kconfig @@ -9,6 +9,17 @@ config LED can provide access to board-specific LEDs. Use of the device tree for configuration is encouraged. +config LED_BOOT + bool "Enable LED boot support" + help + Enable LED boot support. + + LED boot is a specific LED assigned to signal boot operation status. + Defined in Device Tree /options/u-boot node. Refer here for the supported + options [1]. + + [1] dtschema/schemas/options/u-boot.yaml + config LED_BCM6328 bool "LED Support for BCM6328" depends on LED && ARCH_BMIPS diff --git a/drivers/led/led-uclass.c b/drivers/led/led-uclass.c index 199d68bc25..54113213dc 100644 --- a/drivers/led/led-uclass.c +++ b/drivers/led/led-uclass.c @@ -94,6 +94,75 @@ int led_set_period(struct udevice *dev, int period_ms) return -ENOSYS; } +#ifdef CONFIG_LED_BOOT +static int led_boot_get(struct udevice **devp, int *period_ms) +{ + struct led_uc_priv *priv; + struct uclass *uc; + int ret; + + ret = uclass_get(UCLASS_LED, &uc); + if (ret) + return ret; + + priv = uclass_get_priv(uc); + if (!priv->boot_led_label) + return -ENOENT; + + if (period_ms) + *period_ms = priv->boot_led_period; + + return led_get_by_label(priv->boot_led_label, devp); +} + +int led_boot_on(void) +{ + struct udevice *dev; + int ret; + + ret = led_boot_get(&dev, NULL); + if (ret) + return ret; + + return led_set_state(dev, LEDST_ON); +} + +int led_boot_off(void) +{ + struct udevice *dev; + int ret; + + ret = led_boot_get(&dev, NULL); + if (ret) + return ret; + + return led_set_state(dev, LEDST_OFF); +} + +#if defined(CONFIG_LED_BLINK) || defined(CONFIG_LED_SW_BLINK) +int led_boot_blink(void) +{ + struct udevice *dev; + int period_ms, ret; + + ret = led_boot_get(&dev, &period_ms); + if (ret) + return ret; + + ret = led_set_period(dev, period_ms); + if (ret) { + if (ret != -ENOSYS) + return ret; + + /* fallback to ON with no set_period and no SW_BLINK */ + return led_set_state(dev, LEDST_ON); + } + + return led_set_state(dev, LEDST_BLINK); +} +#endif +#endif + static int led_post_bind(struct udevice *dev) { struct led_uc_plat *uc_plat = dev_get_uclass_plat(dev); @@ -158,10 +227,26 @@ static int led_post_probe(struct udevice *dev) return ret; } +#ifdef CONFIG_LED_BOOT +static int led_init(struct uclass *uc) +{ + struct led_uc_priv *priv = uclass_get_priv(uc); + + priv->boot_led_label = ofnode_options_read_str("boot-led"); + priv->boot_led_period = ofnode_options_read_int("boot-led-period", 250); + + return 0; +} +#endif + UCLASS_DRIVER(led) = { .id = UCLASS_LED, .name = "led", .per_device_plat_auto = sizeof(struct led_uc_plat), .post_bind = led_post_bind, .post_probe = led_post_probe, +#ifdef CONFIG_LED_BOOT + .init = led_init, + .priv_auto = sizeof(struct led_uc_priv), +#endif }; diff --git a/include/led.h b/include/led.h index 99f93c5ef8..49ec2998a3 100644 --- a/include/led.h +++ b/include/led.h @@ -9,6 +9,7 @@ #include #include +#include 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