linux-kernel - Re: [RFC 2/2] usb: dwc3: Refactor PHY logic to support Multiport Controller

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Date:   Mon, 23 May 2022 12:10:10 -0400
From:   Brian Masney <bmasney@...hat.com>
To:     Harsh Agarwal <quic_harshq@...cinc.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Felipe Balbi <balbi@...nel.org>, linux-usb@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        quic_pkondeti@...cinc.com, quic_ppratap@...cinc.com
Subject: Re: [RFC 2/2] usb: dwc3: Refactor PHY logic to support Multiport
 Controller

On Thu, May 19, 2022 at 06:04:55PM +0530, Harsh Agarwal wrote:
> -	dwc->usb3_generic_phy = devm_phy_get(dev, "usb3-phy");
> -	if (IS_ERR(dwc->usb3_generic_phy)) {
> -		ret = PTR_ERR(dwc->usb3_generic_phy);
> -		if (ret == -ENOSYS || ret == -ENODEV)
> -			dwc->usb3_generic_phy = NULL;
> -		else
> -			return dev_err_probe(dev, ret, "no usb3 phy configured\n");
> +		if (IS_ERR(dwc->usb2_phy[0])) {
> +			ret = PTR_ERR(dwc->usb2_phy[0]);
> +			if (ret == -ENXIO || ret == -ENODEV)
> +				dwc->usb2_phy[0] = NULL;
> +			else
> +				return dev_err_probe(dev, ret, "no usb2 phy configured\n");
> +		}
> +
> +		if (IS_ERR(dwc->usb3_phy[0])) {
> +			ret = PTR_ERR(dwc->usb3_phy[0]);
> +			if (ret == -ENXIO || ret == -ENODEV)
> +				dwc->usb3_phy[0] = NULL;
> +			else
> +				return dev_err_probe(dev, ret, "no usb3 phy configured\n");
> +		}
> +
> +		dwc->usb2_generic_phy = devm_phy_get(dev, "usb2-phy");
> +		if (IS_ERR(dwc->usb2_generic_phy)) {
> +			ret = PTR_ERR(dwc->usb2_generic_phy);
> +			if (ret == -ENOSYS || ret == -ENODEV)
> +				dwc->usb2_generic_phy = NULL;
> +			else
> +				return dev_err_probe(dev, ret, "no usb2 phy configured\n");
> +		}

I know that this block is a copy and paste move from above, but is the
ENOSYS check really needed? It looks like the phy_get() only returns
-ENODEV.

> @@ -1147,8 +1149,10 @@ struct dwc3 {
>  
>  	struct reset_control	*reset;
>  
> -	struct usb_phy		*usb2_phy;
> -	struct usb_phy		*usb3_phy;
> +	struct usb_phy		**usb2_phy;
> +	struct usb_phy		**usb3_phy;
> +	u32			num_hsphy;
> +	u32			num_ssphy;

Rename num_hsphy / num_ssphy to num_usb2_phy and num_usb3_phy so this is
easier to audit.

Brian