regulator: Add pull down support

Some regulators need to be configured to pull down a resistor
when the regulator is disabled. Add an op (set_pull_down) and a
DT property + constraint to support this.

Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/Documentation/devicetree/bindings/regulator/regulator.txt b/Documentation/devicetree/bindings/regulator/regulator.txt
index 553d2d0..6c79fd7 100644 (file)
--- a/Documentation/devicetree/bindings/regulator/regulator.txt
+++ b/Documentation/devicetree/bindings/regulator/regulator.txt
@@ -39,6 +39,7 @@ Optional properties:
   documentation explains which values the regulator supports.
 - regulator-system-load: Load in uA present on regulator that is not captured by
   any consumer request.
+- regulator-pull-down: Enable pull down resistor when the regulator is disabled.
 
 Deprecated properties:
 - regulator-compatible: If a regulator chip contains multiple

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index c8d5e2b..60fcfba 100644 (file)
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -1051,6 +1051,14 @@ static int set_machine_constraints(struct regulator_dev *rdev,
                }
        }
 
+       if (rdev->constraints->pull_down && ops->set_pull_down) {
+               ret = ops->set_pull_down(rdev);
+               if (ret < 0) {
+                       rdev_err(rdev, "failed to set pull down\n");
+                       goto out;
+               }
+       }
+
        print_constraints(rdev);
        return 0;
 out:

diff --git a/drivers/regulator/of_regulator.c b/drivers/regulator/of_regulator.c
index 482a86f..c3433db 100644 (file)
--- a/drivers/regulator/of_regulator.c
+++ b/drivers/regulator/of_regulator.c
@@ -67,6 +67,8 @@ static void of_get_regulation_constraints(struct device_node *np,
        if (!constraints->always_on) /* status change should be possible. */
                constraints->valid_ops_mask |= REGULATOR_CHANGE_STATUS;
 
+       constraints->pull_down = of_property_read_bool(np, "regulator-pull-down");
+
        if (of_property_read_bool(np, "regulator-allow-bypass"))
                constraints->valid_ops_mask |= REGULATOR_CHANGE_BYPASS;
 

diff --git a/include/linux/regulator/driver.h b/include/linux/regulator/driver.h
index fffa688..76144a3 100644 (file)
--- a/include/linux/regulator/driver.h
+++ b/include/linux/regulator/driver.h
@@ -121,6 +121,9 @@ struct regulator_linear_range {
  * @set_suspend_mode: Set the operating mode for the regulator when the
  *                    system is suspended.
  *
+ * @set_pull_down: Configure the regulator to pull down when the regulator
+ *                is disabled.
+ *
  * This struct describes regulator operations which can be implemented by
  * regulator chip drivers.
  */
@@ -187,6 +190,8 @@ struct regulator_ops {
 
        /* set regulator suspend operating mode (defined in consumer.h) */
        int (*set_suspend_mode) (struct regulator_dev *, unsigned int mode);
+
+       int (*set_pull_down) (struct regulator_dev *);
 };
 
 /*

diff --git a/include/linux/regulator/machine.h b/include/linux/regulator/machine.h
index 0152655..8ffb061 100644 (file)
--- a/include/linux/regulator/machine.h
+++ b/include/linux/regulator/machine.h
@@ -87,6 +87,7 @@ struct regulator_state {
  *           applied.
  * @apply_uV: Apply the voltage constraint when initialising.
  * @ramp_disable: Disable ramp delay when initialising or when setting voltage.
+ * @pull_down: Enable pull down when regulator is disabled.
  *
  * @input_uV: Input voltage for regulator when supplied by another regulator.
  *
@@ -141,6 +142,7 @@ struct regulation_constraints {
        unsigned boot_on:1;     /* bootloader/firmware enabled regulator */
        unsigned apply_uV:1;    /* apply uV constraint if min == max */
        unsigned ramp_disable:1; /* disable ramp delay */
+       unsigned pull_down:1;   /* pull down resistor when regulator off */
 };
 
 /**