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>

1 files changed, 3 insertions, 3 deletions

diff --git a/drivers/pinctrl/pinmux.c b/drivers/pinctrl/pinmux.c
index 220fa492c9f0..3d5ac73bd5a7 100644
--- a/drivers/pinctrl/pinmux.c
+++ b/drivers/pinctrl/pinmux.c
@@ -41,8 +41,7 @@ int pinmux_check_ops(struct pinctrl_dev *pctldev)
             !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 @@ void pinmux_disable_setting(struct pinctrl_setting const *setting)
                 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