pinctrl: renesas: rzg2l: Add support for enabling/disabling open-drain outputs

Add support for enabling and disabling open-drain outputs.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Tested-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
Link: https://lore.kernel.org/20241004123658.764557-3-prabhakar.mahadev-lad.rj@bp.renesas.com
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

diff --git a/drivers/pinctrl/renesas/pinctrl-rzg2l.c b/drivers/pinctrl/renesas/pinctrl-rzg2l.c
index 0a32d692628c40e930bbe6e3def33e4b36d1933b..8fbb27248160b96dd864f766a63eb9695d0729b1 100644 (file)
--- a/drivers/pinctrl/renesas/pinctrl-rzg2l.c
+++ b/drivers/pinctrl/renesas/pinctrl-rzg2l.c
@@ -139,6 +139,7 @@
 #define IEN(off)               (0x1800 + (off) * 8)
 #define PUPD(off)              (0x1C00 + (off) * 8)
 #define ISEL(off)              (0x2C00 + (off) * 8)
+#define NOD(off)               (0x3000 + (off) * 8)
 #define SD_CH(off, ch)         ((off) + (ch) * 4)
 #define ETH_POC(off, ch)       ((off) + (ch) * 4)
 #define QSPI                   (0x3008)
@@ -160,6 +161,7 @@
 #define IOLH_MASK              0x03
 #define SR_MASK                        0x01
 #define PUPD_MASK              0x03
+#define NOD_MASK               0x01
 
 #define PM_INPUT               0x1
 #define PM_OUTPUT              0x2
@@ -1338,6 +1340,18 @@ static int rzg2l_pinctrl_pinconf_get(struct pinctrl_dev *pctldev,
                break;
        }
 
+       case PIN_CONFIG_DRIVE_OPEN_DRAIN:
+       case PIN_CONFIG_DRIVE_PUSH_PULL:
+               if (!(cfg & PIN_CFG_NOD))
+                       return -EINVAL;
+
+               arg = rzg2l_read_pin_config(pctrl, NOD(off), bit, NOD_MASK);
+               if (!arg && param != PIN_CONFIG_DRIVE_PUSH_PULL)
+                       return -EINVAL;
+               if (arg && param != PIN_CONFIG_DRIVE_OPEN_DRAIN)
+                       return -EINVAL;
+               break;
+
        case RENESAS_RZV2H_PIN_CONFIG_OUTPUT_IMPEDANCE:
                if (!(cfg & PIN_CFG_IOLH_RZV2H))
                        return -EINVAL;
@@ -1467,6 +1481,15 @@ static int rzg2l_pinctrl_pinconf_set(struct pinctrl_dev *pctldev,
                        rzg2l_rmw_pin_config(pctrl, IOLH(off), bit, IOLH_MASK, index);
                        break;
 
+               case PIN_CONFIG_DRIVE_OPEN_DRAIN:
+               case PIN_CONFIG_DRIVE_PUSH_PULL:
+                       if (!(cfg & PIN_CFG_NOD))
+                               return -EINVAL;
+
+                       rzg2l_rmw_pin_config(pctrl, NOD(off), bit, NOD_MASK,
+                                            param == PIN_CONFIG_DRIVE_OPEN_DRAIN ? 1 : 0);
+                       break;
+
                case RENESAS_RZV2H_PIN_CONFIG_OUTPUT_IMPEDANCE:
                        if (!(cfg & PIN_CFG_IOLH_RZV2H))
                                return -EINVAL;