Add code to reset all reset signals as in gpio DT node. A reset property
is an optional feature, so only print out a warning and do not fail if a
reset property is not present.
If a reset property is discovered, then use it to deassert, thus
bringing the IP out of reset.
Signed-off-by: Ley Foon Tan <ley.foon....@intel.com>
---
v2:
- Move reset to probe() function.
---
drivers/gpio/dwapb_gpio.c | 20 +++++++++++++++++++-
1 file changed, 19 insertions(+), 1 deletion(-)
diff --git a/drivers/gpio/dwapb_gpio.c b/drivers/gpio/dwapb_gpio.c
index 7cf2d47..dfe1e6d 100644
--- a/drivers/gpio/dwapb_gpio.c
+++ b/drivers/gpio/dwapb_gpio.c
@@ -15,6 +15,7 @@
#include <dm/lists.h>
#include <dm/root.h>
#include <errno.h>
+#include <reset.h>
DECLARE_GLOBAL_DATA_PTR;
@@ -99,13 +100,30 @@ static const struct dm_gpio_ops gpio_dwapb_ops = {
.get_function = dwapb_gpio_get_function,
};
+static void gpio_dwapb_reset(struct udevice *dev)
+{
+ struct reset_ctl_bulk reset_bulk;
+ int ret;
+
+ ret = reset_get_bulk(dev, &reset_bulk);
+ if (ret) {
+ dev_warn(dev, "Can't get reset: %d\n", ret);
+ return;
+ }
+
+ reset_deassert_bulk(&reset_bulk);
+}
+
static int gpio_dwapb_probe(struct udevice *dev)
{
struct gpio_dev_priv *priv = dev_get_uclass_priv(dev);
struct gpio_dwapb_platdata *plat = dev->platdata;
- if (!plat)
+ if (!plat) {
+ /* Reset on parent device only */
+ gpio_dwapb_reset(dev);
return 0;
+ }
priv->gpio_count = plat->pins;
priv->bank_name = plat->name;
--
2.2.2
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