Re: Using GPIO

["Ludovic Desroches" <ludovic.desroches@gmail.com>]

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Hi,

I am also trying to use Xilinx GPIO driver on my board but I encounter some
problems. I thought they will be resolved with this information but it
doesn't.

I use GPIO driver as built-in but during kernel boot but I don't see log
about it contrary to Xemac driver for instance. First I wanted to create my
gpio driver normally without using Xilinx one, with ioremap and writel/readl
but I didn't write anything in the register, I don't know why. Then I tried
to use Xilinx GPIO driver but I don't know why I don't hit xgpio_probe,
xgpio_init returns 0 so it's OK.

Do you have any idea ?

Thanks

Ludovic Desroches


> arch/ppc/syslib/virtex_devices.c:
>
> >* // 0 is LEDS_4BIT, 1 is LEDS_POSITIONS, 2 is PUSH_BUTTONS_POSITION
> *>* #define XPAR_GPIO(num) { \
> *>*    .name = "xilinx_gpio", \
> *>*    .id = num, \
> *>*    .num_resources = 2, \
> *That was a 2.
> If anybody wants to make a patch out of those few lines of code, I couldn't
> figure out how to do this with git... But I will use a more general GPIO
> approach as soon as I can put my hands on our custom card.
>
> >*    .resource = (struct resource[]) { \
> *>*        { \
> *>*            .start = XPAR_GPIO_##num##_BASEADDR, \
> *>*            .end = XPAR_GPIO_##num##_HIGHADDR, \
> *>*            .flags = IORESOURCE_MEM, \
> *>*        }, \
> *>*        { \
> *>*            .start = XPAR_INTC_0_GPIO_##num##_VEC_ID, \
> *>*            .flags = IORESOURCE_IRQ, \
> *>*        }, \
> *>*    }, \
> *>* }
> *>* [...]
> *>*      /* GPIO instances */
> *>* #if defined(XPAR_GPIO_0_BASEADDR)
> *>*      XPAR_GPIO(0),
> *>* #endif
> *>* #if defined(XPAR_GPIO_1_BASEADDR)
> *>*      XPAR_GPIO(1),
> *>* #endif
> *>* #if defined(XPAR_GPIO_2_BASEADDR)
> *>*      XPAR_GPIO(2),
> *>* #endif
> *
>
>

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