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gpio: zynq: Add support for reading gpio pin state

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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>
This commit is contained in:
Michal Simek 2016-03-04 15:56:50 +01:00
parent 7f307d93ed
commit a6b9587bad
1 changed files with 22 additions and 0 deletions
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22
drivers/gpio/zynq_gpio.c
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@ -299,11 +299,33 @@ static int zynq_gpio_direction_output(struct udevice *dev, unsigned gpio,
return 0; 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 = { static const struct dm_gpio_ops gpio_zynq_ops = {
.direction_input = zynq_gpio_direction_input, .direction_input = zynq_gpio_direction_input,
.direction_output = zynq_gpio_direction_output, .direction_output = zynq_gpio_direction_output,
.get_value = zynq_gpio_get_value, .get_value = zynq_gpio_get_value,
.set_value = zynq_gpio_set_value, .set_value = zynq_gpio_set_value,
.get_function = zynq_gpio_get_function,
}; };
static const struct udevice_id zynq_gpio_ids[] = { static const struct udevice_id zynq_gpio_ids[] = {