linux-kernel - Re: [PATCH v7 14/14] usb: host: xhci-plat: Add otg device to platform data

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Date:	Wed, 11 May 2016 17:00:27 +0800
From:	Peter Chen <hzpeterchen@...il.com>
To:	Roger Quadros <rogerq@...com>
Cc:	peter.chen@...escale.com, stern@...land.harvard.edu,
	balbi@...nel.org, gregkh@...uxfoundation.org,
	dan.j.williams@...el.com, jun.li@...escale.com,
	mathias.nyman@...ux.intel.com, tony@...mide.com,
	Joao.Pinto@...opsys.com, abrestic@...omium.org,
	yoshihiro.shimoda.uh@...esas.com, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org,
	devicetree@...r.kernel.org
Subject: Re: [PATCH v7 14/14] usb: host: xhci-plat: Add otg device to
 platform data

On Mon, May 02, 2016 at 03:18:57PM +0300, Roger Quadros wrote:
> Host controllers that are part of an OTG/dual-role instance
> need to somehow pass the OTG controller device information
> to the HCD core.
> 
> We use platform data to pass the OTG controller device.
> 
> Signed-off-by: Roger Quadros <rogerq@...com>
> ---
>  drivers/usb/host/xhci-plat.c     | 35 ++++++++++++++++++++++++++++-------
>  include/linux/usb/xhci_pdriver.h |  3 +++
>  2 files changed, 31 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
> index 5c15e9b..84ebe18 100644
> --- a/drivers/usb/host/xhci-plat.c
> +++ b/drivers/usb/host/xhci-plat.c
> @@ -230,11 +230,20 @@ static int xhci_plat_probe(struct platform_device *pdev)
>  			goto put_usb3_hcd;
>  	}
>  
> -	ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
> +	if (pdata && pdata->otg_dev)
> +		ret = usb_otg_add_hcd(hcd, irq, IRQF_SHARED, pdata->otg_dev);
> +	else
> +		ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
> +
>  	if (ret)
>  		goto disable_usb_phy;
>  
> -	ret = usb_add_hcd(xhci->shared_hcd, irq, IRQF_SHARED);
> +	if (pdata && pdata->otg_dev)
> +		ret = usb_otg_add_hcd(xhci->shared_hcd, irq, IRQF_SHARED,
> +				      pdata->otg_dev);
> +	else
> +		ret = usb_add_hcd(xhci->shared_hcd, irq, IRQF_SHARED);
> +
>  	if (ret)
>  		goto dealloc_usb2_hcd;
>  
> @@ -242,7 +251,10 @@ static int xhci_plat_probe(struct platform_device *pdev)
>  
>  
>  dealloc_usb2_hcd:
> -	usb_remove_hcd(hcd);
> +	if (pdata && pdata->otg_dev)
> +		usb_otg_remove_hcd(hcd);
> +	else
> +		usb_remove_hcd(hcd);
>  
>  disable_usb_phy:
>  	usb_phy_shutdown(hcd->usb_phy);
> @@ -260,16 +272,25 @@ put_hcd:
>  	return ret;
>  }
>  
> -static int xhci_plat_remove(struct platform_device *dev)
> +static int xhci_plat_remove(struct platform_device *pdev)
>  {
> -	struct usb_hcd	*hcd = platform_get_drvdata(dev);
> +	struct usb_hcd	*hcd = platform_get_drvdata(pdev);
>  	struct xhci_hcd	*xhci = hcd_to_xhci(hcd);
>  	struct clk *clk = xhci->clk;
> +	struct usb_xhci_pdata *pdata = dev_get_platdata(&pdev->dev);
> +
> +	if (pdata && pdata->otg_dev)
> +		usb_otg_remove_hcd(xhci->shared_hcd);
> +	else
> +		usb_remove_hcd(xhci->shared_hcd);
>  
> -	usb_remove_hcd(xhci->shared_hcd);
>  	usb_phy_shutdown(hcd->usb_phy);
>  
> -	usb_remove_hcd(hcd);
> +	if (pdata && pdata->otg_dev)
> +		usb_otg_remove_hcd(hcd);
> +	else
> +		usb_remove_hcd(hcd);
> +
>  	usb_put_hcd(xhci->shared_hcd);
>  
>  	if (!IS_ERR(clk))
> diff --git a/include/linux/usb/xhci_pdriver.h b/include/linux/usb/xhci_pdriver.h
> index 376654b..5c68b83 100644
> --- a/include/linux/usb/xhci_pdriver.h
> +++ b/include/linux/usb/xhci_pdriver.h
> @@ -18,10 +18,13 @@
>   *
>   * @usb3_lpm_capable:	determines if this xhci platform supports USB3
>   *			LPM capability
> + * @otg_dev:		OTG controller device. Only requied if part of
> + *			OTG/dual-role.
>   *
>   */
>  struct usb_xhci_pdata {
>  	unsigned	usb3_lpm_capable:1;
> +	struct device	*otg_dev;
>  };
>  
>  #endif /* __USB_CORE_XHCI_PDRIVER_H */
> -- 
> 2.7.4
> 

Reviewed-by: Peter Chen <peter.chen@....com>

-- 

Best Regards,
Peter Chen