[U-Boot] [PATCH 3/4] sunxi: common VBUS detection logic in usbc

[Marek Vasut <marex@denx.de>]

On Sunday, March 15, 2015 at 06:27:46 PM, Paul Kocialkowski wrote:
> VBUS detection could be needed not only by the musb code (to prevent host
> mode), but also by e.g. gadget drivers to start only when a cable is
> connected.
> 
> In addition, this allows more flexibility in vbus detection, as it could
> easily be extended to other USBC indexes. Eventually, this would help
> making musb support independent from a hardcoded USB controller index (0).
> 
> Signed-off-by: Paul Kocialkowski <contact@paulk.fr>

Hi!

[...]

> @@ -113,6 +120,17 @@ static int get_vbus_gpio(int index)
>  	return -1;
>  }
> 
> +static int get_vbus_detect_gpio(int index)
> +{
> +	if (use_axp_vbus_detect(index))
> +		return -1;
> +
> +	switch (index) {
> +	case 0: return sunxi_name_to_gpio(CONFIG_USB0_VBUS_DET);

What happens if the index != 0 here ? Default branch with some error
report might be a good idea here.

> +	}
> +	return -1;
> +}
> +

[...]

> @@ -270,3 +297,34 @@ void sunxi_usbc_vbus_disable(int index)
>  	if (sunxi_usbc->gpio_vbus != -1)
>  		gpio_direction_output(sunxi_usbc->gpio_vbus, 0);
>  }
> +
> +int sunxi_usbc_vbus_detect(int index)
> +{
> +	struct sunxi_usbc_hcd *sunxi_usbc = &sunxi_usbc_hcd[index];
> +	int err;
> +
> +#ifdef AXP_VBUS_DETECT

Can't you just wrap this ifdef into use_axp_vbus_detect(), so the
code isn't so riddled with the ifdeffery ?

> +	if (use_axp_vbus_detect(index)) {
> +		err = axp_get_vbus();
> +		if (err < 0)
> +			return err;
> +	} else {
> +#endif
> +		if (sunxi_usbc->gpio_vbus_det == -1) {
> +			eprintf("Error: invalid vbus detection pin\n");
> +			return -1;
> +		}
> +
> +		err = gpio_direction_input(sunxi_usbc->gpio_vbus_det);
> +		if (err)
> +			return err;
> +
> +		err = gpio_get_value(sunxi_usbc->gpio_vbus_det);
> +		if (err < 0)
> +			return err;
> +#ifdef AXP_VBUS_DETECT
> +	}
> +#endif
> +
> +	return err;

[...]