linux-kernel - Re: [PATCH v2 4/6] usb: roles: add API to get usb_role

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Date:   Fri, 15 Mar 2019 11:11:27 +0200
From:   Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To:     Chunfeng Yun <chunfeng.yun@...iatek.com>,
        Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mark Rutland <mark.rutland@....com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Adam Thomson <Adam.Thomson.Opensource@...semi.com>,
        Li Jun <jun.li@....com>,
        Badhri Jagan Sridharan <badhri@...gle.com>,
        Hans de Goede <hdegoede@...hat.com>,
        Min Guo <min.guo@...iatek.com>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH v2 4/6] usb: roles: add API to get usb_role_switch by node

On Fri, Mar 15, 2019 at 10:18:35AM +0200, Heikki Krogerus wrote:
> Andy already pointed out that you need to use fwnodes.
> 
> Rule of thumb: You always use fwnodes. Only if there is something that
> can't be done with fwnodes you use DT or ACPI nodes directly.
> 
> In this case there is absolutely nothing that would prevent you from
> using fwnodes.

...

> +/**
> + * usb_role_switch_get_by_node - Find USB role switch by it's parent node
> + * @node: The node that register USB role switch
> + *
> + * Finds and returns role switch registered by @node. The reference count
> + * for the found switch is incremented.
> + */
> +struct usb_role_switch *usb_role_switch_get_by_node(struct device_node *node)

This is my proposal for function prototype:

struct usb_role_switch *
fwnode_usb_role_switch_get(struct fwnode_handle *fwnode);


thanks,

-- 
heikki