[PATCH v1 1/1] pinctrl: eswin: Fix Handling of PIN_CONFIG_PERSIST_STATE

[PATCH v1 1/1] pinctrl: eswin: Fix Handling of PIN_CONFIG_PERSIST_STATE

[Yulin Lu]

The EIC7700 pinctrl driver does not handle PIN_CONFIG_PERSIST_STATE
specifically, and returns -EOPNOTSUPP from the default case.

Since all pins on the EIC7700 SoC are persistent over suspend, the
correct behaviour is to accept this parameter and return success.

Add an explicit case for PIN_CONFIG_PERSIST_STATE that returns 0 to
prevent errors when this parameter is set.

Signed-off-by: Yulin Lu <luyulin@eswincomputing.com>
Fixes: 5b797bcc00ef ("pinctrl: eswin: Add EIC7700 pinctrl driver")
---
 drivers/pinctrl/pinctrl-eic7700.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/pinctrl/pinctrl-eic7700.c b/drivers/pinctrl/pinctrl-eic7700.c
index d553ec20c619..09a3b097383c 100644
--- a/drivers/pinctrl/pinctrl-eic7700.c
+++ b/drivers/pinctrl/pinctrl-eic7700.c
@@ -422,6 +422,9 @@ static int eic7700_pin_config_set(struct pinctrl_dev *pctldev, unsigned int pin,
 			else
 				value &= ~EIC7700_ST;
 			break;
+		/* All pins are persistent over suspend */
+		case PIN_CONFIG_PERSIST_STATE:
+			return 0;
 		default:
 			return -EOPNOTSUPP;
 		}
-- 
2.34.1