Re: [PATCH v3 10/12] hikey960: Support usb functionality of Hikey960

[Andy Shevchenko]

On Mon, Mar 4, 2019 at 4:35 AM Chen Yu <chenyu56@xxxxxxxxxx> wrote:
> On 2019/3/3 0:01, Andy Shevchenko wrote:
> > On Sat, Mar 2, 2019 at 11:05 AM Yu Chen <chenyu56@xxxxxxxxxx> wrote:

> >> +config HISI_HIKEY_USB
> >> +       tristate "USB functionality of HiSilicon Hikey Platform"
> >> +       depends on OF && GPIOLIB
> >> +       help
> >> +         If you say yes here you get support for usb functionality of HiSilicon Hikey Platform.
> >
> >> +#include <linux/of.h>
> >
> > It's hard to see why this have
> > depends on OF followed by above header inclusion.
> >
> This driver depends on devicetree, so I add "depends on OF".
> But is seems that "#include <linux/of.h>" can be removed after "of_" API
> have been removed. Thanks for your reminder!

So, it means that technically there is no such dependency, rather
administratively.

> >> +       hisi_hikey_usb->typec_vbus = devm_gpiod_get(dev, "typec-vbus",
> >> +                       GPIOD_OUT_LOW);
> >
> >> +       if (!hisi_hikey_usb->typec_vbus)
> >> +               return -ENOENT;
> >
> > Hmm... Is it possible to get NULL pointer from gpiod_get() at all?
> >
> >> +       if (!hisi_hikey_usb->otg_switch)
> >> +               return -ENOENT;
> >
> > Ditto.
> >
> I check the comments of devm_gpio_get API, it will not return NULL pointer.
> But is it more safe to keep the NULL checking? What is your advice?

Why do we need dead code?

-- 
With Best Regards,
Andy Shevchenko