[PATCH u-boot 2/3] usb: host: dwc3: Add support for multiple PHYs

[Marek Vasut]

On 03/29/2018 03:42 PM, Neil Armstrong wrote:
> DWC3 Ips can have more than 1 PHY for USB2 and 1 PHY for USB3, add support
> for a generic number of PHYs and adapt the code to handle a generic
> number of PHYs.
> 
> Signed-off-by: Neil Armstrong <narmstrong at baylibre.com>
> ---
>  drivers/usb/host/xhci-dwc3.c | 105 ++++++++++++++++++++++++-------------------
>  1 file changed, 58 insertions(+), 47 deletions(-)
> 
> diff --git a/drivers/usb/host/xhci-dwc3.c b/drivers/usb/host/xhci-dwc3.c
> index 1022dd5..da29162 100644
> --- a/drivers/usb/host/xhci-dwc3.c
> +++ b/drivers/usb/host/xhci-dwc3.c
> @@ -22,8 +22,8 @@
>  DECLARE_GLOBAL_DATA_PTR;
>  
>  struct xhci_dwc3_platdata {
> -	struct phy usb_phy;
> -	struct phy usb3_phy;
> +	struct phy *usb_phys;
> +	int num_phys;
>  };
>  
>  void dwc3_set_mode(struct dwc3 *dwc3_reg, u32 mode)
> @@ -113,45 +113,74 @@ void dwc3_set_fladj(struct dwc3 *dwc3_reg, u32 val)
>  }
>  
>  #ifdef CONFIG_DM_USB
> -static int xhci_dwc3_setup_phy(struct udevice *dev, int index, struct phy *phy)
> +static int xhci_dwc3_setup_phy(struct udevice *dev, int count)
>  {
> -	int ret = 0;
> +	struct xhci_dwc3_platdata *plat = dev_get_platdata(dev);
> +	int i, ret;
> +
> +	if (!count)
> +		return 0;
>  
> -	ret = generic_phy_get_by_index(dev, index, phy);
> -	if (ret) {
> -		if (ret != -ENOENT) {
> -			pr_err("Failed to get USB PHY for %s\n", dev->name);
> +	plat->usb_phys = devm_kcalloc(dev, count, sizeof(struct phy),
> +					GFP_KERNEL);
> +	if (!plat->usb_phys)
> +		return -ENOMEM;
> +
> +	for (i = 0; i < count; i++) {
> +		ret = generic_phy_get_by_index(dev, i, &plat->usb_phys[i]);
> +		if (ret && ret != -ENOENT) {
> +			pr_err("Failed to get USB PHY%d for %s\n",
> +			       i, dev->name);
>  			return ret;
>  		}
> -	} else {
> -		ret = generic_phy_init(phy);
> +
> +		++plat->num_phys;
> +	}
> +	
> +	for (i = 0; i < plat->num_phys; i++) {
> +		ret = generic_phy_init(&plat->usb_phys[i]);
>  		if (ret) {
> -			pr_err("Can't init USB PHY for %s\n", dev->name);
> -			return ret;
> +			pr_err("Can't init USB PHY%d for %s\n",
> +			       i, dev->name);
> +			goto phys_err;
>  		}
> -		ret = generic_phy_power_on(phy);
> +	}
> +	
> +	for (i = 0; i < plat->num_phys; i++) {
> +		ret = generic_phy_power_on(&plat->usb_phys[i]);
>  		if (ret) {
> -			pr_err("Can't power on USB PHY for %s\n", dev->name);
> -			generic_phy_exit(phy);
> -			return ret;
> +			pr_err("Can't power USB PHY%d for %s\n",
> +			       i, dev->name);
> +			goto phys_err;
>  		}
>  	}
>  
>  	return 0;
> +
> +phys_err:
> +	for (; i >= 0; i--) {
> +		generic_phy_power_off(&plat->usb_phys[i]);
> +		generic_phy_exit(&plat->usb_phys[i]);
> +	}

This will not work if all the PHYs are inited, but the power up function
fails -- at that point the phy_exit will not be called for all inited PHys.

-- 
Best regards,
Marek Vasut