linux-kernel - Re: [PATCH 2/3] of: of_gpiochip_add is needed only for gpiolib

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Date:	Mon, 31 Jan 2011 15:16:35 -0700
From:	Grant Likely <grant.likely@...retlab.ca>
To:	Thomas Chou <thomas@...ron.com.tw>
Cc:	Haavard Skinnemoen <hskinnemoen@...il.com>,
	Ben Dooks <ben-linux@...ff.org>, linux-kernel@...r.kernel.org,
	nios2-dev@...c.et.ntust.edu.tw,
	devicetree-discuss@...ts.ozlabs.org, linux-i2c@...r.kernel.org,
	Jean Delvare <khali@...ux-fr.org>
Subject: Re: [PATCH 2/3] of: of_gpiochip_add is needed only for gpiolib

On Mon, Jan 31, 2011 at 11:25:50PM +0800, Thomas Chou wrote:
> Some gpio drivers may not use gpiolib. In this case, struct gpio_chip
> is not defined and of_gpiochip_add/remove are not needed.
> 
> Signed-off-by: Thomas Chou <thomas@...ron.com.tw>

I'm not thrilled with the idea of supporting a gpio subsystem that
doesn't use gpiolib.  These functions don't even make sense if gpiolib
isn't being used (gpio_chip is a gpiolib construct).

Have you posted a patch that depends on this change?  Patch 3 in this
series doesn't seem to need it.

g.

> ---
>  include/linux/of_gpio.h |    4 ++++
>  1 files changed, 4 insertions(+), 0 deletions(-)
> 
> diff --git a/include/linux/of_gpio.h b/include/linux/of_gpio.h
> index 6598c04..fc96af0 100644
> --- a/include/linux/of_gpio.h
> +++ b/include/linux/of_gpio.h
> @@ -71,9 +71,13 @@ static inline unsigned int of_gpio_count(struct device_node *np)
>  	return 0;
>  }
>  
> +#ifdef CONFIG_GPIOLIB
> +
>  static inline void of_gpiochip_add(struct gpio_chip *gc) { }
>  static inline void of_gpiochip_remove(struct gpio_chip *gc) { }
>  
> +#endif /* CONFIG_GPIOLIB */
> +
>  #endif /* CONFIG_OF_GPIO */
>  
>  /**
> -- 
> 1.7.3.5
> 
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