Re: [PATCH v12 2/4] gadget: Support for the usb charger framework

Baolin Wang
2016-06-23T08:56:33Z

Hi,

On 21 June 2016 at 18:27, Felipe Balbi <balbi@kernel.org> wrote:
>
> Hi,
>
> Baolin Wang <baolin.wang@linaro.org> writes:
>> For supporting the usb charger, it adds the usb_charger_init() and
>> usb_charger_exit() functions for usb charger initialization and exit.
>>
>> It will report to the usb charger when the gadget state is changed,
>> then the usb charger can do the power things.
>>
>> Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
>> Reviewed-by: Li Jun <jun.li@nxp.com>
>> Tested-by: Li Jun <jun.li@nxp.com>
>
> Before anything, I must say that I really liked this patch. It's
> minimaly invasive to udc core and does all the necessary changes. If it
> wasn't for the extra charger class, this would've been perfect.
>
> Can't you just tie a charger to a UDC and avoid the charger class
> completely?
>
>> static inline int usb_gadget_vbus_draw(struct usb_gadget *gadget, unsigned mA)
>> {
>> + if (gadget->charger)
>
> I guess you could do this check inside
> usb_gadget_set_cur_limit_by_type() itself.

We will access the 'gadget->charger->type' member when issuing
usb_gadget_set_cur_limit_by_type(), so I think I should leave the
check here in next new version.

--
Baolin.wang
Best Regards