pinctrl: mediatek: common: Fix probe failure for devices without EINT

Some pinctrl devices like mt6397 or mt6392 don't support EINT at all, but
the mtk_eint_init function is always called and returns -ENODEV, which
then bubbles up and causes probe failure.

To address this only call mtk_eint_init if EINT pins are present.

Tested on Xiaomi Mi Smart Clock x04g (mt6392).

Fixes: e46df23 ("pinctrl: mediatek: refactor EINT related code for all MediaTek pinctrl can fit")
Signed-off-by: Luca Leonardo Scorcia <[email protected]>
Reviewed-by: AngeloGioacchino Del Regno <[email protected]>
Signed-off-by: Linus Walleij <[email protected]>

Author: lscorcia

drivers/pinctrl/mediatek/pinctrl-mtk-common.c

@@ -1135,9 +1135,12 @@ int mtk_pctrl_init(struct platform_device *pdev,
 		goto chip_error;
 	}
 
-	ret = mtk_eint_init(pctl, pdev);
-	if (ret)
-		goto chip_error;
+	/* Only initialize EINT if we have EINT pins */
+	if (data->eint_hw.ap_num > 0) {
+		ret = mtk_eint_init(pctl, pdev);
+		if (ret)
+			goto chip_error;
+	}
 
 	return 0;