[PATCH v8 09/12] pinctrl: generic: add auto pull config parameter

[Haojian Zhuang]

There's only one bit to control pin bias as enabled or disabled for some
pins in OMAP SoC. So append PIN_CONFIG_BIAS_AUTO_PULL for this case.
User shouldn't switch pin state between AUTO_PULL and PULL_UP/PULL_DOWN,
since they're similiar concepts.

Signed-off-by: Haojian Zhuang <haojian.zhuang at linaro.org>
---
 drivers/pinctrl/pinconf-generic.c       |    1 +
 include/linux/pinctrl/pinconf-generic.h |    3 +++
 2 files changed, 4 insertions(+)

diff --git a/drivers/pinctrl/pinconf-generic.c b/drivers/pinctrl/pinconf-generic.c
index ef24230..4a67848 100644
--- a/drivers/pinctrl/pinconf-generic.c
+++ b/drivers/pinctrl/pinconf-generic.c
@@ -37,6 +37,7 @@ struct pin_config_item {
 struct pin_config_item conf_items[] = {
 	PCONFDUMP(PIN_CONFIG_BIAS_DISABLE, "input bias disabled", NULL),
 	PCONFDUMP(PIN_CONFIG_BIAS_HIGH_IMPEDANCE, "input bias high impedance", NULL),
+	PCONFDUMP(PIN_CONFIG_BIAS_AUTO_PULL, "input bias auto pull", NULL),
 	PCONFDUMP(PIN_CONFIG_BIAS_PULL_UP, "input bias pull up", NULL),
 	PCONFDUMP(PIN_CONFIG_BIAS_PULL_DOWN, "input bias pull down", NULL),
 	PCONFDUMP(PIN_CONFIG_DRIVE_PUSH_PULL, "output drive push pull", NULL),
diff --git a/include/linux/pinctrl/pinconf-generic.h b/include/linux/pinctrl/pinconf-generic.h
index 3e7909a..f2daff4 100644
--- a/include/linux/pinctrl/pinconf-generic.h
+++ b/include/linux/pinctrl/pinconf-generic.h
@@ -29,6 +29,8 @@
  *	if for example some other pin is going to drive the signal connected
  *	to it for a while. Pins used for input are usually always high
  *	impedance.
+ * @PIN_CONFIG_BIAS_AUTO_PULL: the pin will be pulled without specifying
+ *      pull-up or pull-down.
  * @PIN_CONFIG_BIAS_PULL_UP: the pin will be pulled up (usually with high
  *	impedance to VDD). If the argument is != 0 pull-up is enabled,
  *	if it is 0, pull-up is disabled.
@@ -76,6 +78,7 @@
 enum pin_config_param {
 	PIN_CONFIG_BIAS_DISABLE,
 	PIN_CONFIG_BIAS_HIGH_IMPEDANCE,
+	PIN_CONFIG_BIAS_AUTO_PULL,
 	PIN_CONFIG_BIAS_PULL_UP,
 	PIN_CONFIG_BIAS_PULL_DOWN,
 	PIN_CONFIG_DRIVE_PUSH_PULL,
-- 
1.7.10.4