Function gpiod_get_direction() of gpiolib calls get_direction() callback. If chip doesn't implement it EINVAL error is returned. The function doesn't use for returned value shadowed FLAG_IS_OUT bit of gpio_desc.flags field so the callback is required. The patch implements the missing callback.
Inspired from arch/arm/mach-at91/gpio.c Required to get the patch "serial: mxs-auart: enable PPS support" working. Signed-off-by: Janusz Uzycki <[email protected]> --- Two patches were missed during movements between our internal repos. The 2/2 patch is required against commits: f9e42397d79b ("serial: mxs-auart: add interrupts for modem control lines") 36a262782b04 ("serial: mxs-auart: enable PPS support") I've done build-test for the next only before. I should have done hardware test also for the next, sorry. Now it is tested for the next on real hardware too. --- drivers/gpio/gpio-mxs.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/drivers/gpio/gpio-mxs.c b/drivers/gpio/gpio-mxs.c index 8ffdd7d..56052c2 100644 --- a/drivers/gpio/gpio-mxs.c +++ b/drivers/gpio/gpio-mxs.c @@ -227,6 +227,18 @@ static int mxs_gpio_to_irq(struct gpio_chip *gc, unsigned offset) return irq_find_mapping(port->domain, offset); } +static int mxs_gpio_get_direction(struct gpio_chip *gc, unsigned offset) +{ + struct bgpio_chip *bgc = to_bgpio_chip(gc); + struct mxs_gpio_port *port = + container_of(bgc, struct mxs_gpio_port, bgc); + u32 mask = 1 << offset; + u32 dir; + + dir = readl(port->base + PINCTRL_DOE(port)); + return !(dir & mask); +} + static struct platform_device_id mxs_gpio_ids[] = { { .name = "imx23-gpio", @@ -320,6 +332,7 @@ static int mxs_gpio_probe(struct platform_device *pdev) goto out_irqdesc_free; port->bgc.gc.to_irq = mxs_gpio_to_irq; + port->bgc.gc.get_direction = mxs_gpio_get_direction; port->bgc.gc.base = port->id * 32; err = gpiochip_add(&port->bgc.gc); -- 1.7.11.3 -- To unsubscribe from this list: send the line "unsubscribe linux-gpio" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
