linux-kernel - Re: [PATCH RFC v2 4/6] gpio: aggregator: handle runtime registration of gpio_desc in gpiochip

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Message-ID: <Z9hYPHmFYEeeCTZ5@smile.fi.intel.com>
Date: Mon, 17 Mar 2025 19:13:32 +0200
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Thomas Richard <thomas.richard@...tlin.com>
Cc: Linus Walleij <linus.walleij@...aro.org>,
	Bartosz Golaszewski <brgl@...ev.pl>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
	thomas.petazzoni@...tlin.com, DanieleCleri@...on.eu,
	GaryWang@...on.com.tw
Subject: Re: [PATCH RFC v2 4/6] gpio: aggregator: handle runtime registration
 of gpio_desc in gpiochip_fwd

On Mon, Mar 17, 2025 at 04:38:02PM +0100, Thomas Richard wrote:
> Add request() callback to check if the GPIO descriptor was well registered
> in the gpiochip_fwd before to use it. This is done to handle the case
> where GPIO descriptor is added at runtime in the forwarder.
> 
> If at least one GPIO descriptor was not added before the forwarder
> registration, we assume the forwarder can sleep as if a GPIO is added at
> runtime it may sleep.

Hmm... This should rather be reformatted each time a new descriptor is added,
no?

...

> +int gpio_fwd_request(struct gpio_chip *chip, unsigned int offset)
> +{
> +	struct gpiochip_fwd *fwd = gpiochip_get_data(chip);
> +
> +	return fwd->descs[offset] ? 0 : -ENXIO;

Why was this error code chosen?

> +}

...

>  	struct gpio_chip *chip = &fwd->chip;
>  	struct device *dev = fwd->dev;
> -	int error;
> +	int ndescs = 0;
> +	int error, i;

The new added variables are signed. Why?

-- 
With Best Regards,
Andy Shevchenko