[PATCH] pinctrl: sprd: Add PIN_CONFIG_BIAS_DISABLE configuration support

[Baolin Wang]

Add PIN_CONFIG_BIAS_DISABLE configuration support for Spreadtrum pin
controller.

Signed-off-by: Baolin Wang <baolin.w...@linaro.org>
---
 drivers/pinctrl/sprd/pinctrl-sprd.c |   17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/drivers/pinctrl/sprd/pinctrl-sprd.c 
b/drivers/pinctrl/sprd/pinctrl-sprd.c
index 7b95bf5..8869843 100644
--- a/drivers/pinctrl/sprd/pinctrl-sprd.c
+++ b/drivers/pinctrl/sprd/pinctrl-sprd.c
@@ -484,6 +484,13 @@ static int sprd_pinconf_get(struct pinctrl_dev *pctldev, 
unsigned int pin_id,
                               SLEEP_PULL_UP_MASK) << 16;
                        arg |= (reg >> PULL_UP_SHIFT) & PULL_UP_MASK;
                        break;
+               case PIN_CONFIG_BIAS_DISABLE:
+                       if ((reg & (SLEEP_PULL_DOWN | SLEEP_PULL_UP)) ||
+                           (reg & (PULL_DOWN | PULL_UP_4_7K | PULL_UP_20K)))
+                               return -EINVAL;
+
+                       arg = 1;
+                       break;
                case PIN_CONFIG_SLEEP_HARDWARE_STATE:
                        arg = 0;
                        break;
@@ -674,6 +681,16 @@ static int sprd_pinconf_set(struct pinctrl_dev *pctldev, 
unsigned int pin_id,
                                        shift = PULL_UP_SHIFT;
                                }
                                break;
+                       case PIN_CONFIG_BIAS_DISABLE:
+                               if (is_sleep_config == true) {
+                                       val = shift = 0;
+                                       mask = SLEEP_PULL_DOWN | SLEEP_PULL_UP;
+                               } else {
+                                       val = shift = 0;
+                                       mask = PULL_DOWN | PULL_UP_20K |
+                                               PULL_UP_4_7K;
+                               }
+                               break;
                        case PIN_CONFIG_SLEEP_HARDWARE_STATE:
                                continue;
                        default:
-- 
1.7.9.5