lkml.org 
[lkml]   [2022]   [Sep]   [30]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Date
SubjectRe: [PATCH 12/20] gpio/rockchip: add return check for clock rate set
On Fri, Sep 30, 2022 at 11:17 AM Bartosz Golaszewski <brgl@bgdev.pl> wrote:
>
> On Tue, Sep 20, 2022 at 12:31 PM Jianqun Xu <jay.xu@rock-chips.com> wrote:
> >
> > Check if the clock rate set for the apb clock is successful or not.
> >
> > Signed-off-by: Jianqun Xu <jay.xu@rock-chips.com>
> > ---
> > drivers/gpio/gpio-rockchip.c | 3 +++
> > 1 file changed, 3 insertions(+)
> >
> > diff --git a/drivers/gpio/gpio-rockchip.c b/drivers/gpio/gpio-rockchip.c
> > index e36cdbd4bbef..511e93a6a429 100644
> > --- a/drivers/gpio/gpio-rockchip.c
> > +++ b/drivers/gpio/gpio-rockchip.c
> > @@ -199,6 +199,9 @@ static int rockchip_gpio_set_debounce(struct gpio_chip *gc,
> > if (bank->gpio_type == GPIO_TYPE_V2 && !IS_ERR(bank->db_clk)) {
> > div_debounce_support = true;
> > freq = clk_get_rate(bank->db_clk);
> > + if (!freq)
> > + return -EINVAL;
> > +
> > max_debounce = (GENMASK(23, 0) + 1) * 2 * 1000000 / freq;
> > if (debounce > max_debounce)
> > return -EINVAL;
> > --
> > 2.25.1
> >
>
> This cannot happen, clk_get_rate() can only return 0 for clk == NULL.
> We're not using an optional clock.
>

Ah, sorry actually the db_clk can be NULL for certain variants. But in
that case shouldn't we just silently ignore it and return 0? Or return
-ENOTSUPP at the very least?

Bart

\
 
 \ /
  Last update: 2022-09-30 11:30    [W:0.242 / U:0.004 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site