Thanks anyway for sharing - it was instructive
On Wed, Dec 7, 2011 at 1:52 PM, Jean-Christian de Rivaz <j...@eclis.ch> wrote:
> On a OMAP-L138 custom board, the GPIO 5,11 is used as an interrupt for the
> wl12xx driver. It is declared this way in the board file:
>
> #define XBRD_WLAN_IRQ GPIO_TO_PIN(5, 11)
>
> static struct wl12xx_platform_data xbrd_wlan_data __initdata =
> {
> .irq = -1,
> .board_ref_clock = WL12XX_REFCLOCK_38,
> .platform_quirks = WL12XX_PLATFORM_QUIRK_EDGE_**IRQ,
> };
>
> In the init() of the board file:
>
> ret = gpio_request_one(XBRD_WLAN_**IRQ, GPIOF_IN, "wl12xx_irq");
> if (ret) {
> pr_warning("error request wl12xx irq gpio: %d\n", ret);
> }
> xbrd_wlan_data.irq = gpio_to_irq(XBRD_WLAN_IRQ);
> ret = wl12xx_set_platform_data(&**xbrd_wlan_data);
> if (ret) {
> pr_warning("error setting wl12xx data: %d\n", ret);
> }
>
> The oscilloscope show that the electrical signal work exactly as expected
> and described in http://www.lsr.com/downloads/**
> tiwi_r1/TiWi_R1_Datasheet.pdf<http://www.lsr.com/downloads/tiwi_r1/TiWi_R1_Datasheet.pdf>,
> page 19, "IRQ OPERATION". The /sys/kernel/debug/gpio entry show the correct
> state of the line:
>
> GPIOs 64-95, DaVinci:
> gpio-91 (wl12xx_irq ) in lo
>
> When the signal is low on the oscilloscope, and
>
> GPIOs 64-95, DaVinci:
> gpio-91 (wl12xx_irq ) in hi
>
> When the signal is high on the oscilloscope. So far everything seem to be
> ok.
>
> The problem is that when the wl12xx driver is loader, it complain with the
> message:
>
> wl1271: ERROR ELP wakeup timeout!
>
> Reading the code drivers/net/wireless/wl12xx/**ps.c show that the driver
> is clearly waiting for a interrupt at this point. But this is not happening
> according to /proc/interrupts:
>
> 192: 0 GPIO wl1271
>
> And stay always 0. I even connected a 10 Hz periodic square signal to the
> GPIO 5,11 wire, and the /proc/interrupts never increase. But at the same
> time, /sys/kernel/debug/gpio is always reporting the true signal state,
> flipping between "lo" and "hi".
>
> I suspect that something is missing in order to connect the "wl12xx_irq"
> from the GPIO to the "wl1271" of the wl12xx driver. But I can't figure what.
>
> Jean-Christian
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