driver: base: pinctrl: return error from, pinctrl_bind_pins()

strict pin controller returns -EINVAL in case of pin request which is already claimed by somebody else.
Following is the sequence of calling pin_request() from pinctrl_bind_pins():- pinctrl_bind_pins()->pinctrl_select_state()->pinmux_enable_setting()-> pin_request()

But pinctrl_bind_pins() only returns -EPROBE_DEFER which makes device driver probe successful even if the pin request is rejected by the pin controller subsystem.

This commit modifies pinctrl_bind_pins() to return error if the pin is rejected by pin control subsystem.

---
Changes from v1 to v2:
* Modified the comment to indicate return error in case of invalid pin requests

 drivers/base/pinctrl.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

index 5fb74b4..12f0eb5 100644
@@ -80,8 +80,8 @@ cleanup_alloc:
        devm_kfree(dev, dev->pins);
        dev->pins = NULL;
 
-       /* Only return deferrals */
-       if (ret != -EPROBE_DEFER)
+       /* Return deferrals & invalid pin requests */
+       if ((ret != -EPROBE_DEFER) && (ret != -EINVAL))
                ret = 0;
 
        return ret;

--
1.9.1

I already applied something similar, the semantics should be the same. (Your patch, just edited around with it.)

Yours,
Linus Walleij