linux-kernel - Re: [PATCH 4/7] gpiolib: implement dev_gpiochip

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Date:	Fri, 17 Oct 2008 13:24:42 -0700
From:	David Brownell <david-b@...bell.net>
To:	Anton Vorontsov <avorontsov@...mvista.com>
Cc:	linux-kernel@...r.kernel.org,
	David Brownell <dbrownell@...rs.sourceforge.net>,
	"Steven A. Falco" <sfalco@...ris.com>,
	Grant Likely <grant.likely@...retlab.ca>,
	Jean Delvare <khali@...ux-fr.org>,
	David Miller <davem@...emloft.net>, i2c@...sensors.org,
	linuxppc-dev@...abs.org
Subject: Re: [PATCH 4/7] gpiolib: implement dev_gpiochip_{add,remove} calls

On Thursday 16 October 2008, Anton Vorontsov wrote:
> +/*
> + * Platforms can define their own __dev_ versions to glue gpio_chips with the
> + * architecture-specific code.
> + */
> +#ifndef __dev_gpiochip_add
> +#define __dev_gpiochip_add __dev_gpiochip_add
> +static inline int __dev_gpiochip_add(struct device *dev,
> +                                    struct gpio_chip *chip)
> +{
> +       chip->dev = dev;
> +       return gpiochip_add(chip);
> +}
> +#endif /* __dev_gpiochip_add */

This is pretty ugly, especially the implication that *EVERY* gpio_chip
provider needs modification to use these calls.

Surely it would be a lot simpler to just add platform-specific hooks
to gpiochip_{add,remove}(), so that no providers need to be changed??


> +#ifndef __dev_gpiochip_remove
> +#define __dev_gpiochip_remove __dev_gpiochip_remove
> +static inline int __dev_gpiochip_remove(struct device *dev,
> +                                       struct gpio_chip *chip)
> +{
> +       return gpiochip_remove(chip);
> +}
> +#endif /* __dev_gpiochip_remove */


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