gpio: zynq: Add support for reading gpio pin state

Add zynq_gpio_get_function() which return status on gpio pin.
This function enables gpio status command.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>

diff --git a/drivers/gpio/zynq_gpio.c b/drivers/gpio/zynq_gpio.c
index 3a995f610cb3e8acae8f7a6f8220c2365272e5d3..4ab23560810494a386a0b76bad285aa5d9b523ff 100644 (file)
--- a/drivers/gpio/zynq_gpio.c
+++ b/drivers/gpio/zynq_gpio.c
@@ -299,11 +299,33 @@ static int zynq_gpio_direction_output(struct udevice *dev, unsigned gpio,
        return 0;
 }
 
+static int zynq_gpio_get_function(struct udevice *dev, unsigned offset)
+{
+       u32 reg;
+       unsigned int bank_num, bank_pin_num;
+       struct zynq_gpio_privdata *priv = dev_get_priv(dev);
+
+       if (check_gpio(offset, dev) < 0)
+               return -1;
+
+       zynq_gpio_get_bank_pin(offset, &bank_num, &bank_pin_num, dev);
+
+       /* set the GPIO pin as output */
+       reg = readl(priv->base + ZYNQ_GPIO_DIRM_OFFSET(bank_num));
+       reg &= BIT(bank_pin_num);
+       if (reg)
+               return GPIOF_OUTPUT;
+       else
+               return GPIOF_INPUT;
+}
+
 static const struct dm_gpio_ops gpio_zynq_ops = {
        .direction_input        = zynq_gpio_direction_input,
        .direction_output       = zynq_gpio_direction_output,
        .get_value              = zynq_gpio_get_value,
        .set_value              = zynq_gpio_set_value,
+       .get_function           = zynq_gpio_get_function,
+
 };
 
 static const struct udevice_id zynq_gpio_ids[] = {