linux-kernel - Re: [PATCH v1 2/5] pinctrl: stm32: Replace custom code by gpiochip

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Message-ID: <44057328-2454-4f4d-cc90-b0ca35ba1e5a@foss.st.com>
Date:   Tue, 29 Mar 2022 09:59:32 +0200
From:   Fabien DESSENNE <fabien.dessenne@...s.st.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Gregory CLEMENT <gregory.clement@...tlin.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Linus Walleij <linus.walleij@...aro.org>,
        <linux-gpio@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-amlogic@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-renesas-soc@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>
CC:     Neil Armstrong <narmstrong@...libre.com>,
        Kevin Hilman <khilman@...libre.com>,
        Jerome Brunet <jbrunet@...libre.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        Andrew Lunn <andrew@...n.ch>,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Bartosz Golaszewski <brgl@...ev.pl>
Subject: Re: [PATCH v1 2/5] pinctrl: stm32: Replace custom code by
 gpiochip_count() call

Hi Andy,


On 25/03/2022 21:03, Andy Shevchenko wrote:
> Since we have generic function to count GPIO controller nodes
> under given device, there is no need to open code it. Replace
> custom code by gpiochip_count() call.
> 
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> ---
>   drivers/pinctrl/stm32/pinctrl-stm32.c | 8 +++-----
>   1 file changed, 3 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/pinctrl/stm32/pinctrl-stm32.c b/drivers/pinctrl/stm32/pinctrl-stm32.c
> index 9ed764731570..d4bbeec82c1f 100644
> --- a/drivers/pinctrl/stm32/pinctrl-stm32.c
> +++ b/drivers/pinctrl/stm32/pinctrl-stm32.c
> @@ -1423,7 +1423,8 @@ int stm32_pctl_probe(struct platform_device *pdev)
>   	struct device *dev = &pdev->dev;
>   	struct stm32_pinctrl *pctl;
>   	struct pinctrl_pin_desc *pins;
> -	int i, ret, hwlock_id, banks = 0;
> +	int i, ret, hwlock_id;
> +	unsigned int banks;
>   
>   	if (!np)
>   		return -EINVAL;
> @@ -1513,10 +1514,7 @@ int stm32_pctl_probe(struct platform_device *pdev)
>   		return PTR_ERR(pctl->pctl_dev);
>   	}
>   
> -	for_each_available_child_of_node(np, child)

Here we look for "available" child, while the new generic helper 
gpiochip_count() looks for any child, available or not.
Would it be possible to hav gpiochip_count() looking for available child 
as well?
It looks like there is '_available_' version of 
'device_for_each_child_node', maybe this shall be added too.


> -		if (of_property_read_bool(child, "gpio-controller"))
> -			banks++;
> -
> +	banks = gpiochip_count(dev);
>   	if (!banks) {
>   		dev_err(dev, "at least one GPIO bank is required\n");
>   		return -EINVAL;

Fabien