[PATCH 2/5] powerpc: Implement GPIO driver for simple memory-mapped banks

[Anton Vorontsov]

On Wed, Dec 17, 2008 at 10:56:08AM -0600, Kumar Gala wrote:
>
> On Dec 3, 2008, at 1:27 PM, Anton Vorontsov wrote:
>
>> The driver supports very simple GPIO controllers, that is, when a
>> controller provides just a 'data' register. Such controllers may be
>> found in various BCSRs (Board's FPGAs used to control board's
>> switches, LEDs, chip-selects, Ethernet/USB PHY power, etc).
>>
>> So far we support only 1-byte GPIO banks. Support for other widths may
>> be implemented when/if needed.
>>
>> p.s.
>> To avoid "made up" compatible entries (like compatible = "simple- 
>> gpio"),
>> boards must call the simple_gpiochip_init() to pass the compatible
>> string.
>>
>> Signed-off-by: Anton Vorontsov <avorontsov at ru.mvista.com>
>> ---
>> Documentation/powerpc/dts-bindings/fsl/board.txt |   30 ++++
>
> can we pull this out of this patch.

Will do.

[...]
>> +#ifdef CONFIG_SIMPLE_GPIO
>> +extern int simple_gpiochip_init(const char *compatible);
>> +#else
>> +static inline int simple_gpiochip_init(const char *compatible)
>> +{
>> +	return -ENODEV;
>> +}
>> +#endif /* CONFIG_SIMPLE_GPIO */
>> +
>> +#endif /* __SYSDEV_SIMPLE_GPIO_H */
>
> Can I call simple_gpiochip_init() multiple times w/different  
> compatibles?

Yes, sure.

-- 
Anton Vorontsov
email: cbouatmailru at gmail.com
irc://irc.freenode.net/bd2