[PATCH 3/3] gpio: at91: Implement ops get_flags

Zixun LI
2024-10-18T20:46:33Z

Add ops get_dir_flags() to read status from GPIO registers.

Signed-off-by: Zixun LI <admin@hifiphile.com>
---
drivers/gpio/at91_gpio.c | 45 ++++++++++++++++++++++++++++++++++++++++
1 file changed, 45 insertions(+)

diff --git a/drivers/gpio/at91_gpio.c b/drivers/gpio/at91_gpio.c
index 7828f9b447..c986007716 100644
--- a/drivers/gpio/at91_gpio.c
+++ b/drivers/gpio/at91_gpio.c
@@ -240,6 +240,24 @@ static void at91_set_port_multi_drive(struct at91_port *at91_port, int offset, i
else
writel(mask, &at91_port->mddr);
}
+
+static bool at91_get_port_multi_drive(struct at91_port *at91_port, int offset)
+{
+ u32 mask, val;
+
+ mask = 1 << offset;
+ val = readl(&at91_port->mdsr);
+ return val & mask;
+}
+
+static bool at91_get_port_pullup(struct at91_port *at91_port, int offset)
+{
+ u32 mask, val;
+
+ mask = 1 << offset;
+ val = readl(&at91_port->pusr);
+ return val & mask;
+}
#endif

static void at91_set_port_input(struct at91_port *at91_port, int offset,
@@ -608,6 +626,32 @@ static int at91_gpio_set_flags(struct udevice *dev, unsigned int offset,
return 0;
}

+static int at91_gpio_get_flags(struct udevice *dev, unsigned int offset,
+ ulong *flagsp)
+{
+ struct at91_port_priv *port = dev_get_priv(dev);
+ ulong dir_flags = 0;
+
+ if (at91_get_port_output(port->regs, offset)) {
+ dir_flags |= GPIOD_IS_OUT;
+
+ if (at91_get_port_multi_drive(port->regs, offset))
+ dir_flags |= GPIOD_OPEN_DRAIN;
+
+ if (at91_get_port_value(port->regs, offset))
+ dir_flags |= GPIOD_IS_OUT_ACTIVE;
+ } else {
+ dir_flags |= GPIOD_IS_IN;
+ }
+
+ if (at91_get_port_pullup(port->regs, offset))
+ dir_flags |= GPIOD_PULL_UP;
+
+ *flagsp = dir_flags;
+
+ return 0;
+}
+
static const char *at91_get_bank_name(uint32_t base_addr)
{
switch (base_addr) {
@@ -637,6 +681,7 @@ static const struct dm_gpio_ops gpio_at91_ops = {
.set_value = at91_gpio_set_value,
.get_function = at91_gpio_get_function,
.set_flags = at91_gpio_set_flags,
+ .get_flags = at91_gpio_get_flags,
};

static int at91_gpio_probe(struct udevice *dev)
--
2.46.2