diff options
| author | Janusz Uzycki <j.uzycki@elproma.com.pl> | 2014-11-19 09:55:22 +0100 |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2014-11-28 11:28:22 +0100 |
| commit | c8aaa1bf068f76c84111671a7c13ad7b06b21997 (patch) | |
| tree | ee05bf63d009085b8752a8c5ce350300e190219f | |
| parent | fcb8bd47027a2a8dbf6a0212ae09fc86fbe71627 (diff) | |
gpio: mxs: implement get_direction callback
gpiolib's gpiod_get_direction() function returns the EINVAL error
if .get_direction callback is not defined.
The patch implements the callback for mxs chip which is useful
for debugging.
Inspired by arch/arm/mach-at91/gpio.c
On the moment the patch is required to get the patch
"serial: mxs-auart: enable PPS support" working.
It is planned to introduce new mctrl_gpio helpers to avoid
gpiod_get_direction() function.
Signed-off-by: Janusz Uzycki <j.uzycki@elproma.com.pl>
Acked-by: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
| -rw-r--r-- | drivers/gpio/gpio-mxs.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/gpio/gpio-mxs.c b/drivers/gpio/gpio-mxs.c index 8ffdd7d2bad..56052c28571 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); |