[PATCH 1/3] gpio: at91: Implement GPIOF_FUNC in get_function()

Zixun LI
2024-10-18T20:46:14Z

This patch adds support for determining whether a gpio pin is mapped as
peripheral function.

Signed-off-by: Zixun LI <admin@hifiphile.com>
---
drivers/gpio/at91_gpio.c | 13 ++++++++++++-
1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/drivers/gpio/at91_gpio.c b/drivers/gpio/at91_gpio.c
index 1409db5dc1..64a6e8a4a5 100644
--- a/drivers/gpio/at91_gpio.c
+++ b/drivers/gpio/at91_gpio.c
@@ -220,6 +220,15 @@ static bool at91_get_port_output(struct at91_port *at91_port, int offset)
val = readl(&at91_port->osr);
return val & mask;
}
+
+static bool at91_get_port_pio(struct at91_port *at91_port, int offset)
+{
+ u32 mask, val;
+
+ mask = 1 << offset;
+ val = readl(&at91_port->psr);
+ return val & mask;
+}
#endif

static void at91_set_port_input(struct at91_port *at91_port, int offset,
@@ -550,7 +559,9 @@ static int at91_gpio_get_function(struct udevice *dev, unsigned offset)
{
struct at91_port_priv *port = dev_get_priv(dev);

- /* GPIOF_FUNC is not implemented yet */
+ if (!at91_get_port_pio(port->regs, offset))
+ return GPIOF_FUNC;
+
if (at91_get_port_output(port->regs, offset))
return GPIOF_OUTPUT;
else
--
2.46.2