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From: Bartosz Golaszewski <brgl@bgdev.pl>
To: Jianqun Xu <jay.xu@rock-chips.com>
Cc: linus.walleij@linaro.org, heiko@sntech.de,
	andriy.shevchenko@linux.intel.com, robert.moore@intel.com,
	robh@kernel.org, linux-rockchip@lists.infradead.org,
	linux-kernel@vger.kernel.org, lenb@kernel.org, rafael@kernel.org
Subject: Re: [PATCH 12/20] gpio/rockchip: add return check for clock rate set
Date: Fri, 30 Sep 2022 11:17:57 +0200	[thread overview]
Message-ID: <CAMRc=MdjFbzjiLg==ppX_e7cWVw7s1B+Dd=OvrYsnL4ZC_daMg@mail.gmail.com> (raw)
In-Reply-To: <20220920103108.23074-13-jay.xu@rock-chips.com>

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.

Bart

  reply	other threads:[~2022-09-30  9:18 UTC|newest]

Thread overview: 32+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-09-20 10:30 [PATCH 00/20] Rockchip pinctrl/GPIO support ACPI Jianqun Xu
2022-09-20 10:30 ` [PATCH 01/20] ACPI: utils: Add acpi_dev_uid_to_integer() helper to get _UID as integer Jianqun Xu
2022-09-20 10:30 ` [PATCH 02/20] pinctrl/rockchip: populate GPIO platform early Jianqun Xu
2022-09-20 10:30 ` [PATCH 03/20] pinctrl/rockchip: use fwnode instead of of_node Jianqun Xu
2022-09-20 10:30 ` [PATCH 04/20] pinctrl/rockchip: switch to use device_get_match_data Jianqun Xu
2022-10-04  7:13   ` Linus Walleij
2022-09-20 10:30 ` [PATCH 05/20] pinctrl/rockchip: of_populate_platform for gpio only for of node Jianqun Xu
2022-09-20 10:30 ` [PATCH 06/20] pinctrl/rockchip: parse dt only if the fwnode is " Jianqun Xu
2022-09-20 10:30 ` [PATCH 07/20] pinctrl/rockchip: print a message if driver probed successfully Jianqun Xu
2022-09-20 10:30 ` [PATCH 08/20] gpiolib: make gpiochip_find_by_name to be common function Jianqun Xu
2022-09-20 10:30 ` [PATCH 09/20] gpio/rockchip: drop 'bank->name' from the driver Jianqun Xu
2022-09-20 10:30 ` [PATCH 10/20] gpio/rockchip: revert deferred output settings on probe Jianqun Xu
2022-09-20 10:30 ` [PATCH 11/20] gpio/rockchip: add of_node for gpiochip Jianqun Xu
2022-10-04  7:14   ` Linus Walleij
2022-10-04  8:30     ` Andy Shevchenko
2022-10-04  9:06       ` Linus Walleij
     [not found]         ` <2022100814192810242455@rock-chips.com>
2022-10-08 18:21           ` Andy Shevchenko
2022-09-20 10:31 ` [PATCH 12/20] gpio/rockchip: add return check for clock rate set Jianqun Xu
2022-09-30  9:17   ` Bartosz Golaszewski [this message]
2022-09-30  9:28     ` Bartosz Golaszewski
2022-09-20 10:31 ` [PATCH 13/20] gpio/rockchip: disable and put clocks when remove Jianqun Xu
2022-09-30  9:23   ` Bartosz Golaszewski
2022-09-20 10:31 ` [PATCH 14/20] gpio/rockchip: switch to use irq_domain_create_linear Jianqun Xu
2022-09-20 10:31 ` [PATCH 15/20] gpio/rockchip: disable and put clocks when gpiolib register failed Jianqun Xu
2022-10-04  7:16   ` Linus Walleij
2022-10-04  7:16     ` Linus Walleij
2022-09-20 10:31 ` [PATCH 16/20] gpio/rockchip: try to get gpio id from uid when ACPI enabled Jianqun Xu
2022-09-20 10:31 ` [PATCH 17/20] gpio/rockchip: print device with fwnode name when probe successful Jianqun Xu
2022-09-30  9:21   ` Bartosz Golaszewski
2022-09-20 10:31 ` [PATCH 18/20] gpio/rockchip: make use of device property Jianqun Xu
2022-09-20 10:31 ` [PATCH 19/20] gpio/rockchip: make GPIO module work well under ACPI enabled Jianqun Xu
2022-09-20 10:31 ` [PATCH 20/20] pinctrl/rockchip: find existed gpiochip by gpio label Jianqun Xu

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