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authorJanusz Uzycki <j.uzycki@elproma.com.pl>2014-11-19 09:55:22 +0100
committerLinus Walleij <linus.walleij@linaro.org>2014-11-28 11:28:22 +0100
commitc8aaa1bf068f76c84111671a7c13ad7b06b21997 (patch)
treeee05bf63d009085b8752a8c5ce350300e190219f /drivers/gpio/gpio-mxs.c
parentgpio: em: Use dynamic allocation of GPIOs (diff)
downloadlinux-c8aaa1bf068f76c84111671a7c13ad7b06b21997.tar.xz
linux-c8aaa1bf068f76c84111671a7c13ad7b06b21997.zip
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>
Diffstat (limited to 'drivers/gpio/gpio-mxs.c')
-rw-r--r--drivers/gpio/gpio-mxs.c13
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/gpio/gpio-mxs.c b/drivers/gpio/gpio-mxs.c
index 8ffdd7d2bade..56052c285714 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);