Hello Andy,
Thanks a lot for such a quick review!
Please find my comments below.
On Fri, Oct 06, 2023 at 08:57:23PM +0300, Andy Shevchenko wrote:
> On Fri, Oct 6, 2023 at 7:04 PM Dmitry Rokosov
> <ddrokosov@xxxxxxxxxxxxxxxxx> wrote:
> >
> > HWEN is hardware control, which is used for enable/disable aw200xx chip.
> > It's high active, internally pulled down to GND.
> >
> > After HWEN pin set high the chip begins to load the OTP information,
> > which takes 200us to complete. About 200us wait time is needed for
> > internal oscillator startup and display SRAM initialization. After
> > display SRAM initialization, the registers in page1 to page5 can be
>
> pages 1 to 5
>
>
Sure, you are totally right.
> > configured via i2c interface.
>
> ...
>
> > +#include <linux/of_gpio.h>
>
> Definitely not.
>
> Use agnostic APIs.
Sure
> > @@ -116,6 +117,7 @@ struct aw200xx {
> > struct mutex mutex;
>
> > u32 num_leds;
> > u32 display_rows;
> > + int hwen;
> > struct aw200xx_led leds[];
>
> Side note: add a patch to use __counted_by() here.
Okay, now I see the patch with __counted_by() some days ago. I will
rebase on it.
> > + if (!gpio_is_valid(chip->hwen))
>
> Absolutely not. You may not use legacy GPIO APIs.
Exactly
> > + return;
> > +
> > + gpio_set_value(chip->hwen, 1);
>
> Ditto.
Ok
> > + usleep_range(400, 500);
>
> fsleep() ?
Agreed. In this situation fsleep() automatic behaviour is acceptable.
>
> ...
>
> > +static void aw200xx_disable(const struct aw200xx *const chip)
> > +{
> > + if (gpio_is_valid(chip->hwen))
> > + gpio_set_value(chip->hwen, 0);
> > +}
>
> As per above.
Ok
> > +static void aw200xx_probe_hwen(struct device *dev, struct aw200xx *chip)
> > +{
> > + chip->hwen = of_get_named_gpio(dev->of_node, "awinic,hwen-gpio", 0);
> > + if (gpio_is_valid(chip->hwen))
> > + if (devm_gpio_request_one(dev, chip->hwen, GPIOF_OUT_INIT_HIGH,
> > + "AW200XX HWEN")) {
> > + dev_warn(dev, "Can't request gpio %d, tag it invalid\n",
> > + chip->hwen);
> > + chip->hwen = -EINVAL;
> > + }
> > +}
>
> Please, rewrite this completely using supported APIs and not
> deprecated or obsolete ones.
Yep, I see. I will use devm_gpiod_* API.
--
Thank you,
Dmitry
