[PATCH] arm: boards: Add support for protonic-mecsbc board

[Ahmad Fatoum]

Hello Sascha,

On 03.04.24 10:10, Sascha Hauer wrote:
> +static int saradc_get_value(const char *chan)
> +{
> +	int ret, voltage;
> +	struct aiochannel *aio;
> +
> +	if (!IS_ENABLED(CONFIG_AIODEV)) {
> +		pr_warn_once("AIODEV disabled, cannot read hardware id/rev\n");
> +		return 0;
> +	}
> +
> +	aio = aiochannel_by_name(chan);
> +	if (IS_ERR(aio))
> +		return PTR_ERR(aio);
> +
> +	ret = aiochannel_get_value(aio, &voltage);
> +	if (ret)
> +		return ret;
> +
> +	return voltage;
> +}

Other rockchip boards have similar board code. Maybe we should
have a helper in <aiodev.h> instead?

> +
> +static int mecsbc_get_usb_boot(void)
> +{
> +	return saradc_get_value("aiodev0.in_value0_mV") < 74;
> +}
> +
> +static int mecsbc_adc_id_values[] = {
> +	1800, 1662, 1521, 1354, 1214, 1059, 900, 742, 335, 589, 278, 137, 0
> +};
> +
> +static int mecsbc_get_adc_id(const char *chan)
> +{
> +	int val;
> +	unsigned int t;
> +
> +	val = saradc_get_value(chan);
> +	if (val < 0)
> +		return 0;
> +
> +	val += 74;
> +
> +	for (t = 0; t < ARRAY_SIZE(mecsbc_adc_id_values); t++) {
> +		if (val > mecsbc_adc_id_values[t])
> +			return t;
> +	}
> +
> +	return t;
> +}
> +
> +static void mecsbc_process_adc(void)
> +{
> +	/* Check if we need to enable the USB gadget instead of booting */
> +	if (mecsbc_get_usb_boot()) {
> +		setenv("global.boot.default", "net");
> +		setenv("global.usbgadget.acm", "1");
> +		setenv("global.usbgadget.autostart", "1");
> +		setenv("global.system.partitions", "/dev/mmc0(mmc0)");

There's globalvar_set() which avoids parsing the string to do a
device lookup by name.

Looks good otherwise:

Reviewed-by: Ahmad Fatoum <a.fatoum at pengutronix.de>

Cheers,
Ahmad

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