Re: [PATCH v7 3/5] usb: dwc2: add generic PHY framework support for dwc2 usb controler platform driver.

[Robert Jarzmik <robert.jarzmik@free.fr>]

Paul Zimmerman <Paul.Zimmerman@synopsys.com> writes:
> The patch below fixes it. And it seems like the right thing to me,
> since GPIOs should be optional for a generic phy, I would think. But
> my device tree foo is very weak, so I'm not sure.
>
> CCing Robert, who touched the generic phy code last. Robert, what do
> you think?
I think your patch in [1] is correct, because
"Documentation/devicetree/bindings/usb/usb-nop-xceiv.txt" states that
reset-gpios is optional, and because Felipe told me gpios for phy_generic are
optional.

Now the original code was written by Felipe, so better ask him first. The
original code was :
af9f51c55 phy-generic.c nop->gpio_reset = of_get_named_gpio_flags(node, "reset-gpios",
af9f51c55 phy-generic.c                                                 0, &flags);
af9f51c55 phy-generic.c if (nop->gpio_reset == -EPROBE_DEFER)
af9f51c55 phy-generic.c         return -EPROBE_DEFER;

Cheers.

--
Robert

[1]
> diff --git a/drivers/usb/phy/phy-generic.c b/drivers/usb/phy/phy-generic.c
> index dd05254..9a826ff 100644
> --- a/drivers/usb/phy/phy-generic.c
> +++ b/drivers/usb/phy/phy-generic.c
> @@ -218,10 +218,10 @@ int usb_phy_gen_create_phy(struct device *dev, struct usb_phy_generic *nop,
>  			clk_rate = 0;
>  
>  		needs_vcc = of_property_read_bool(node, "vcc-supply");
> -		nop->gpiod_reset = devm_gpiod_get(dev, "reset-gpios");
> +		nop->gpiod_reset = devm_gpiod_get_optional(dev, "reset-gpios");
>  		err = PTR_ERR(nop->gpiod_reset);
>  		if (!err) {
> -			nop->gpiod_vbus = devm_gpiod_get(dev,
> +			nop->gpiod_vbus = devm_gpiod_get_optional(dev,
>  							 "vbus-detect-gpio");
>  			err = PTR_ERR(nop->gpiod_vbus);
>  		}