[PATCH] pinctrl: pinctrl-zynq: Add warning for not to use 'io-standard'

This patch add warning message saying 'io-standard' property is deprecated
and instead use 'power-source' property for configuring power supplies.
This gives an indication for Zynq pinctrl users to migrate to use
'power-source' property.

Signed-off-by: Sai Krishna Potthuri <redacted>
---
 drivers/pinctrl/pinctrl-zynq.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/pinctrl/pinctrl-zynq.c b/drivers/pinctrl/pinctrl-zynq.c
index a96af8a..5b269b6 100644
--- a/drivers/pinctrl/pinctrl-zynq.c
+++ b/drivers/pinctrl/pinctrl-zynq.c

@@ -1028,6 +1028,8 @@ static int zynq_pinconf_cfg_get(struct pinctrl_dev *pctldev,
 		break;
 	}
 	case PIN_CONFIG_IOSTANDARD:
+		dev_warn(pctldev->dev, "io-standard is deprecated, please use power-source");
+		fallthrough;
 	case PIN_CONFIG_POWER_SOURCE:
 		arg = zynq_pinconf_iostd_get(reg);
 		break;

@@ -1079,6 +1081,8 @@ static int zynq_pinconf_cfg_set(struct pinctrl_dev *pctldev,
 
 			break;
 		case PIN_CONFIG_IOSTANDARD:
+			dev_warn(pctldev->dev, "io-standard is deprecated, please use power-source");
+			fallthrough;
 		case PIN_CONFIG_POWER_SOURCE:
 			if (arg <= zynq_iostd_min || arg >= zynq_iostd_max) {
 				dev_warn(pctldev->dev,