lkml.org 
[lkml]   [2016]   [Jun]   [13]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    Subject[PATCH v11 09/14] usb: of: add an API to get OTG device from USB controller node
    From
    Date
    The OTG controller and the USB controller can be linked via the
    '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@ti.com>
    Acked-by: Peter Chen <peter.chen@nxp.com>
    Acked-by: Rob Herring <robh@kernel.org>
    ---
    v11:
    - removed unnecessary @otg_caps from documentation of of_usb_get_otg()

    Documentation/devicetree/bindings/usb/generic.txt | 3 +++
    drivers/usb/common/common.c | 26 +++++++++++++++++++++++
    include/linux/usb/of.h | 9 ++++++++
    3 files changed, 38 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..d0c104c 100644
    --- a/drivers/usb/common/common.c
    +++ b/drivers/usb/common/common.c
    @@ -238,6 +238,32 @@ 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
    + *
    + * Return: 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

    \
     
     \ /
      Last update: 2016-06-13 10:41    [W:4.199 / U:0.648 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site