gpio: menz127: use the new open drain callback

The menz127 driver tries to support open drain by detecting it
at request time. However: without the new callbacks from the
gpiolib it is not really working: the core will still just emulate
the open drain mode by switching the line to an input.

By adding a hook into the new .set_single_ended() call rather than
trying to autodetect at request() time, proper open drain can be
supported.

Cc: Andreas Werner <andy@wernerandy.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/drivers/gpio/gpio-menz127.c b/drivers/gpio/gpio-menz127.c
index 8c1ab8e..334fe27 100644 (file)
--- a/drivers/gpio/gpio-menz127.c
+++ b/drivers/gpio/gpio-menz127.c
@@ -88,21 +88,25 @@ static int men_z127_debounce(struct gpio_chip *gc, unsigned gpio,
        return 0;
 }
 
-static int men_z127_request(struct gpio_chip *gc, unsigned gpio_pin)
+static int men_z127_set_single_ended(struct gpio_chip *gc,
+                                    unsigned offset,
+                                    enum single_ended_mode mode)
 {
        struct men_z127_gpio *priv = gpiochip_get_data(gc);
        u32 od_en;
 
-       if (gpio_pin >= gc->ngpio)
-               return -EINVAL;
+       if (mode != LINE_MODE_OPEN_DRAIN &&
+           mode != LINE_MODE_PUSH_PULL)
+               return -ENOTSUPP;
 
        spin_lock(&priv->lock);
        od_en = readl(priv->reg_base + MEN_Z127_ODER);
 
-       if (gpiochip_line_is_open_drain(gc, gpio_pin))
-               od_en |= BIT(gpio_pin);
+       if (mode == LINE_MODE_OPEN_DRAIN)
+               od_en |= BIT(offset);
        else
-               od_en &= ~BIT(gpio_pin);
+               /* Implicitly LINE_MODE_PUSH_PULL */
+               od_en &= ~BIT(offset);
 
        writel(od_en, priv->reg_base + MEN_Z127_ODER);
        spin_unlock(&priv->lock);
@@ -147,7 +151,7 @@ static int men_z127_probe(struct mcb_device *mdev,
                goto err_unmap;
 
        men_z127_gpio->gc.set_debounce = men_z127_debounce;
-       men_z127_gpio->gc.request = men_z127_request;
+       men_z127_gpio->gc.set_single_ended = men_z127_set_single_ended;
 
        ret = gpiochip_add_data(&men_z127_gpio->gc, men_z127_gpio);
        if (ret) {