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SubjectRe: [PATCH 1/2] ARM: ixp4xx: fix compilation, add gpiolib support
On 02/09/2012 10:11 AM, Russell King - ARM Linux wrote:
> On Wed, Feb 08, 2012 at 08:24:28PM +0100, Marc Kleine-Budde wrote:
>> diff --git a/arch/arm/mach-ixp4xx/common.c b/arch/arm/mach-ixp4xx/common.c
>> index 3841ab4..963f752 100644
>> --- a/arch/arm/mach-ixp4xx/common.c
>> +++ b/arch/arm/mach-ixp4xx/common.c
>> @@ -36,6 +36,7 @@
>> #include <asm/page.h>
>> #include <asm/irq.h>
>> #include <asm/sched_clock.h>
>> +#include <asm/gpio.h>
>
> linux/gpio.h

Done.

>
>> diff --git a/arch/arm/mach-ixp4xx/include/mach/gpio.h b/arch/arm/mach-ixp4xx/include/mach/gpio.h
>> index 83d6b4e..093dfad 100644
>> --- a/arch/arm/mach-ixp4xx/include/mach/gpio.h
>> +++ b/arch/arm/mach-ixp4xx/include/mach/gpio.h
>> @@ -27,49 +27,31 @@
>>
>> #include <linux/kernel.h>
>> #include <mach/hardware.h>
>> +#include <asm-generic/gpio.h> /* cansleep wrappers */
>>
>> #define __ARM_GPIOLIB_COMPLEX
>>
>> -static inline int gpio_request(unsigned gpio, const char *label)
>> -{
>> - return 0;
>> -}
>> -
>> -static inline void gpio_free(unsigned gpio)
>> -{
>> - might_sleep();
>> -
>> - return;
>> -}
>> -
>> -static inline int gpio_direction_input(unsigned gpio)
>> -{
>> - gpio_line_config(gpio, IXP4XX_GPIO_IN);
>> - return 0;
>> -}
>> -
>> -static inline int gpio_direction_output(unsigned gpio, int level)
>> -{
>> - gpio_line_set(gpio, level);
>> - gpio_line_config(gpio, IXP4XX_GPIO_OUT);
>> - return 0;
>> -}
>> +#define NR_BUILTIN_GPIO 16
>>
>> static inline int gpio_get_value(unsigned gpio)
>> {
>> - int value;
>> -
>> - gpio_line_get(gpio, &value);
>> -
>> - return value;
>> + if (gpio < NR_BUILTIN_GPIO) {
>> + int value;
>> + gpio_line_get(gpio, &value);
>> + return value;
>> + } else
>> + return __gpio_get_value(gpio);
>> }
>>
>> static inline void gpio_set_value(unsigned gpio, int value)
>> {
>> - gpio_line_set(gpio, value);
>> + if (gpio < NR_BUILTIN_GPIO)
>> + gpio_line_set(gpio, value);
>> + else
>> + __gpio_set_value(gpio, value);
>> }
>>
>> -#include <asm-generic/gpio.h> /* cansleep wrappers */
>> +#define gpio_cansleep __gpio_cansleep
>>
>> extern int gpio_to_irq(int gpio);
>> #define gpio_to_irq gpio_to_irq
>
> Does anything on ixp4xx require fast access to on-chip GPIOs? If not,

I don't know the ixp4xx hardware enough. Can someone comment on this?

> it would be much better to get rid of this and just use the standard
> wrapping, which can be done by changing this entire file to be just a
> single line:
>
> /* empty */

I have to remove the ixp4xx specific gpio_to_irq and irq_to_gpio
functions or keep the #define gpio_to_irq gpio_to_irq.

It compiles now, I'll test on the hardware when I'm home.

regards,
Marc
--
Pengutronix e.K. | Marc Kleine-Budde |
Industrial Linux Solutions | Phone: +49-231-2826-924 |
Vertretung West/Dortmund | Fax: +49-5121-206917-5555 |
Amtsgericht Hildesheim, HRA 2686 | http://www.pengutronix.de |
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