pinctrl: make pinmux disable function optional

Some SoCs may not have pinmux disable function in HW.

Acked-by: Stephen Warren <swarren@wwwdotorg.org>
Signed-off-by: Dong Aisheng <dong.aisheng@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
diff --git a/drivers/pinctrl/pinmux.c b/drivers/pinctrl/pinmux.c
index 220fa49..3d5ac73 100644
--- a/drivers/pinctrl/pinmux.c
+++ b/drivers/pinctrl/pinmux.c
@@ -41,8 +41,7 @@
 	    !ops->get_functions_count ||
 	    !ops->get_function_name ||
 	    !ops->get_function_groups ||
-	    !ops->enable ||
-	    !ops->disable) {
+	    !ops->enable) {
 		dev_err(pctldev->dev, "pinmux ops lacks necessary functions\n");
 		return -EINVAL;
 	}
@@ -497,7 +496,8 @@
 		desc->mux_setting = NULL;
 	}
 
-	ops->disable(pctldev, setting->data.mux.func, setting->data.mux.group);
+	if (ops->disable)
+		ops->disable(pctldev, setting->data.mux.func, setting->data.mux.group);
 }
 
 #ifdef CONFIG_DEBUG_FS