linux-kernel - Re: [PATCH 3/4] of/gpio: Implement GPIOLIB notifier hooks

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Message-Id: <20100312130723.43308ccd.akpm@linux-foundation.org>
Date:	Fri, 12 Mar 2010 13:07:23 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Anton Vorontsov <avorontsov@...mvista.com>
Cc:	Grant Likely <grant.likely@...retlab.ca>,
	David Brownell <dbrownell@...rs.sourceforge.net>,
	Bill Gatliff <bgat@...lgatliff.com>,
	Dmitry Eremin-Solenikov <dbaryshkov@...il.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	linuxppc-dev@...abs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/4] of/gpio: Implement GPIOLIB notifier hooks

On Fri, 5 Feb 2010 23:32:36 +0300
Anton Vorontsov <avorontsov@...mvista.com> wrote:

> This patch implements GPIOLIB notifier hooks, and thus makes device-enabled
> GPIO chips (i.e. the ones that have gpio_chip->dev specified) automatically
> attached to the OpenFirmware subsystem. Which means that now we can handle
> I2C and SPI GPIO chips almost* transparently.
> 
> ...
>
> +static int of_gpiochip_register_simple(struct gpio_chip *chip,
> +				       struct device_node *np)

Why is this called "register_simple" but the unregistration function
isn't called "unregister_simple"?

> +{
> +	struct of_gpio_chip *of_gc;
> +
> +	if (np->data) {
> +		WARN_ON(1);
> +		return -EBUSY;
> +	}
> +
> +	of_gc = kzalloc(sizeof(*of_gc), GFP_KERNEL);
> +	if (!of_gc)
> +		return -ENOMEM;
> +
> +	of_gc->gpio_cells = 2;
> +	of_gc->xlate = of_gpio_simple_xlate;
> +	of_gc->chip = chip;
> +	np->data = of_gc;
> +	of_node_get(np);
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL(of_gpiochip_register_simple);

Makes no sense to export a static symbol and to provide no declaration
of it in a .h file.  I assume the export was unintended.


My plot is somewhat lost.  Grant, could you please summarise in
easy-for-akpm-to-understand terms what your issues are with this
patchset and how you think we should proceed?

Thanks.
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