linux-kernel - Re: [PATCH v7 09/14] usb: of: add an API to get OTG device from USB controller node

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Date:	Wed, 11 May 2016 16:40:57 +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 09/14] usb: of: add an API to get OTG device from USB
 controller node

On Mon, May 02, 2016 at 03:18:52PM +0300, Roger Quadros wrote:
> The OTG controller and the USB controller an be linked via the

Typo?

Others are ok for me.

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

> 'otg-controller' property in the USB controller's device node.
> 
> of_usb_get_otg() can be used to get the OTG controller device
> from the USB controller's device node.
> 
> Signed-off-by: Roger Quadros <rogerq@...com>
> ---
>  Documentation/devicetree/bindings/usb/generic.txt |  3 +++
>  drivers/usb/common/common.c                       | 27 +++++++++++++++++++++++
>  include/linux/usb/of.h                            |  9 ++++++++
>  3 files changed, 39 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/usb/generic.txt b/Documentation/devicetree/bindings/usb/generic.txt
> index bba8257..f6866c1 100644
> --- a/Documentation/devicetree/bindings/usb/generic.txt
> +++ b/Documentation/devicetree/bindings/usb/generic.txt
> @@ -24,6 +24,9 @@ Optional properties:
>  			optional for OTG device.
>   - adp-disable: tells OTG controllers we want to disable OTG ADP, ADP is
>  			optional for OTG device.
> + - otg-controller: phandle to otg controller. Host or gadget controllers can
> +			contain this property to link it to a particular OTG
> +			controller.
>  
>  This is an attribute to a USB controller such as:
>  
> diff --git a/drivers/usb/common/common.c b/drivers/usb/common/common.c
> index e3d0161..d7ec471 100644
> --- a/drivers/usb/common/common.c
> +++ b/drivers/usb/common/common.c
> @@ -238,6 +238,33 @@ int of_usb_update_otg_caps(struct device_node *np,
>  }
>  EXPORT_SYMBOL_GPL(of_usb_update_otg_caps);
>  
> +#ifdef CONFIG_USB_OTG
> +/**
> + * of_usb_get_otg - get the OTG controller linked to the USB controller
> + * @np: Pointer to the device_node of the USB controller
> + * @otg_caps: Pointer to the target usb_otg_caps to be set
> + *
> + * Returns the OTG controller device or NULL on error.
> + */
> +struct device *of_usb_get_otg(struct device_node *np)
> +{
> +	struct device_node *otg_np;
> +	struct platform_device *pdev;
> +
> +	otg_np = of_parse_phandle(np, "otg-controller", 0);
> +	if (!otg_np)
> +		return NULL;
> +
> +	pdev = of_find_device_by_node(otg_np);
> +	of_node_put(otg_np);
> +	if (!pdev)
> +		return NULL;
> +
> +	return &pdev->dev;
> +}
> +EXPORT_SYMBOL_GPL(of_usb_get_otg);
> +#endif
> +
>  #endif
>  
>  MODULE_LICENSE("GPL");
> diff --git a/include/linux/usb/of.h b/include/linux/usb/of.h
> index de3237f..499a4e8 100644
> --- a/include/linux/usb/of.h
> +++ b/include/linux/usb/of.h
> @@ -40,6 +40,15 @@ static inline struct device_node *usb_of_get_child_node
>  }
>  #endif
>  
> +#if IS_ENABLED(CONFIG_OF) && IS_ENABLED(CONFIG_USB_OTG)
> +struct device *of_usb_get_otg(struct device_node *np);
> +#else
> +static inline struct device *of_usb_get_otg(struct device_node *np)
> +{
> +	return NULL;
> +}
> +#endif
> +
>  #if IS_ENABLED(CONFIG_OF) && IS_ENABLED(CONFIG_USB_SUPPORT)
>  enum usb_phy_interface of_usb_get_phy_mode(struct device_node *np);
>  #else
> -- 
> 2.7.4
> 
> --
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-- 

Best Regards,
Peter Chen