[PATCH v3 6/7] pinctrl: at91: Add support to align with Linux Devicetree

[Manikandan Muralidharan]

U-Boot pinctrl driver expects a reg property explicitly unlike linux.
To align the DT of U-boot with the Linux, reg property is also arrvied
from child GPIO bank nodes when configured under the pinctrl node.

Signed-off-by: Manikandan Muralidharan <manikanda...@microchip.com>
---
 drivers/pinctrl/pinctrl-at91.c | 25 +++++++++++++++++++------
 1 file changed, 19 insertions(+), 6 deletions(-)

diff --git a/drivers/pinctrl/pinctrl-at91.c b/drivers/pinctrl/pinctrl-at91.c
index 2afa1b66821..2938635ed95 100644
--- a/drivers/pinctrl/pinctrl-at91.c
+++ b/drivers/pinctrl/pinctrl-at91.c
@@ -522,17 +522,30 @@ static int at91_pinctrl_probe(struct udevice *dev)
 {
        struct at91_pinctrl_priv *priv = dev_get_priv(dev);
        fdt_addr_t addr_base;
+       struct udevice *gpio_node;
        int index;
 
-       for (index = 0; index < MAX_GPIO_BANKS; index++) {
-               addr_base = devfdt_get_addr_index(dev, index);
-               if (addr_base == FDT_ADDR_T_NONE)
-                       break;
+       if (list_empty(&dev->child_head)) {
+               for (index = 0; index < MAX_GPIO_BANKS; index++) {
+                       addr_base = devfdt_get_addr_index(dev, index);
+                       if (addr_base == FDT_ADDR_T_NONE)
+                               break;
 
-               priv->reg_base[index] = (struct at91_port *)addr_base;
+                       priv->reg_base[index] = (struct at91_port *)addr_base;
+               }
+       } else {
+               index = 0;
+               list_for_each_entry(gpio_node, &dev->child_head, sibling_node) {
+                       addr_base = dev_read_addr(gpio_node);
+                       if (addr_base == FDT_ADDR_T_NONE)
+                               break;
+
+                       priv->reg_base[index] = (struct at91_port *)addr_base;
+                       index++;
+               }
        }
 
-       priv->nbanks = index;
+       priv->nbanks = index < MAX_GPIO_BANKS ? index : MAX_GPIO_BANKS;
 
        return 0;
 }
-- 
2.25.1