[PATCH 1/2] led: Implement software led blinking

[Rasmus Villemoes]

Mikhail Kshevetskiy <mikhail.kshevetskiy at iopsys.eu> writes:

> +
> +static int led_sw_set_period(struct udevice *dev, int period_ms)
> +{
> +	struct led_uc_plat *uc_plat = dev_get_uclass_plat(dev);
> +	struct cyclic_info *cyclic = uc_plat->cyclic;
> +	struct led_ops *ops = led_get_ops(dev);
> +	char cyclic_name[64];
> +	int half_period_us;
> +
> +	uc_plat->sw_blink_state = LED_SW_BLINK_ST_NONE;
> +	ops->set_state(dev, LEDST_OFF);
> +
> +	half_period_us = period_ms * 1000 / 2;
> +
> +	if (cyclic) {
> +		cyclic->delay_us = half_period_us;
> +		cyclic->start_time_us = timer_get_us();
> +	} else {
> +		snprintf(cyclic_name, sizeof(cyclic_name),
> +			 "led_sw_blink_%s", uc_plat->label);
> +
> +		cyclic = cyclic_register(led_sw_blink, half_period_us,
> +					 cyclic_name, dev);
> +		if (!cyclic) {
> +			log_err("Registering of blinking function for %s failed\n",
> +				uc_plat->label);
> +			return -ENOMEM;
> +		}
> +
> +		uc_plat->cyclic = cyclic;
> +	}

You need to be aware of the API change that is by now in master, see
https://lore.kernel.org/u-boot/20240521084652.1726460-1-rasmus.villemoes@prevas.dk/
and in particular commits 3a11eada38e and 008c4b3c3115. The latter
you'll find soon enough because this won't build.

The former is a bit more subtle and would silently break here (as
passing an auto array is no longer allowed) - consider whether you
really need the led_sw_blink_ to be part of the name, or if
uc_plat->label itself isn't descriptive enough.

Rasmus