regulator: s2mps11: Implement set_ramp_rate callback for bucks

Implementing set_ramp_rate() and using standard constraints for getting
ramp_delay and ramp_disable, instead of getting it as s2mps11 specific data
through platform data, makes driver more compliant with framework and reduces
the complexity for adding DT support.

Signed-off-by: Yadwinder Singh Brar <yadi.brar@samsung.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

1 files changed, 117 insertions, 0 deletions

diff --git a/drivers/regulator/s2mps11.c b/drivers/regulator/s2mps11.c
index a671eb63a4e5..4b84e7660637 100644
--- a/drivers/regulator/s2mps11.c
+++ b/drivers/regulator/s2mps11.c
@@ -16,6 +16,7 @@
 #include <linux/gpio.h>
 #include <linux/slab.h>
 #include <linux/module.h>
+#include <linux/regmap.h>
 #include <linux/platform_device.h>
 #include <linux/regulator/driver.h>
 #include <linux/regulator/machine.h>
@@ -104,6 +105,121 @@ static int s2mps11_regulator_set_voltage_time_sel(struct regulator_dev *rdev,
         return DIV_ROUND_UP(abs(new_volt - old_volt), ramp_delay);
 }
 
+static int s2mps11_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay)
+{
+        struct s2mps11_info *s2mps11 = rdev_get_drvdata(rdev);
+        unsigned int ramp_val, ramp_shift, ramp_reg = S2MPS11_REG_RAMP_BUCK;
+        unsigned int ramp_enable = 1, enable_shift = 0;
+        int ret;
+
+        switch (rdev->desc->id) {
+        case S2MPS11_BUCK1:
+                if (ramp_delay > s2mps11->ramp_delay16)
+                        s2mps11->ramp_delay16 = ramp_delay;
+                else
+                        ramp_delay = s2mps11->ramp_delay16;
+
+                ramp_shift = S2MPS11_BUCK16_RAMP_SHIFT;
+                break;
+        case S2MPS11_BUCK2:
+                enable_shift = S2MPS11_BUCK2_RAMP_EN_SHIFT;
+                if (!ramp_delay) {
+                        ramp_enable = 0;
+                        break;
+                }
+
+                s2mps11->ramp_delay2 = ramp_delay;
+                ramp_shift = S2MPS11_BUCK2_RAMP_SHIFT;
+                ramp_reg = S2MPS11_REG_RAMP;
+                break;
+        case S2MPS11_BUCK3:
+                enable_shift = S2MPS11_BUCK3_RAMP_EN_SHIFT;
+                if (!ramp_delay) {
+                        ramp_enable = 0;
+                        break;
+                }
+
+                if (ramp_delay > s2mps11->ramp_delay34)
+                        s2mps11->ramp_delay34 = ramp_delay;
+                else
+                        ramp_delay = s2mps11->ramp_delay34;
+
+                ramp_shift = S2MPS11_BUCK34_RAMP_SHIFT;
+                ramp_reg = S2MPS11_REG_RAMP;
+                break;
+        case S2MPS11_BUCK4:
+                enable_shift = S2MPS11_BUCK4_RAMP_EN_SHIFT;
+                if (!ramp_delay) {
+                        ramp_enable = 0;
+                        break;
+                }
+
+                if (ramp_delay > s2mps11->ramp_delay34)
+                        s2mps11->ramp_delay34 = ramp_delay;
+                else
+                        ramp_delay = s2mps11->ramp_delay34;
+
+                ramp_shift = S2MPS11_BUCK34_RAMP_SHIFT;
+                ramp_reg = S2MPS11_REG_RAMP;
+                break;
+        case S2MPS11_BUCK5:
+                s2mps11->ramp_delay5 = ramp_delay;
+                ramp_shift = S2MPS11_BUCK5_RAMP_SHIFT;
+                break;
+        case S2MPS11_BUCK6:
+                enable_shift = S2MPS11_BUCK6_RAMP_EN_SHIFT;
+                if (!ramp_delay) {
+                        ramp_enable = 0;
+                        break;
+                }
+
+                if (ramp_delay > s2mps11->ramp_delay16)
+                        s2mps11->ramp_delay16 = ramp_delay;
+                else
+                        ramp_delay = s2mps11->ramp_delay16;
+
+                ramp_shift = S2MPS11_BUCK16_RAMP_SHIFT;
+                break;
+        case S2MPS11_BUCK7:
+        case S2MPS11_BUCK8:
+        case S2MPS11_BUCK10:
+                if (ramp_delay > s2mps11->ramp_delay7810)
+                        s2mps11->ramp_delay7810 = ramp_delay;
+                else
+                        ramp_delay = s2mps11->ramp_delay7810;
+
+                ramp_shift = S2MPS11_BUCK7810_RAMP_SHIFT;
+                break;
+        case S2MPS11_BUCK9:
+                s2mps11->ramp_delay9 = ramp_delay;
+                ramp_shift = S2MPS11_BUCK9_RAMP_SHIFT;
+                break;
+        default:
+                return 0;
+        }
+
+        if (!ramp_enable)
+                goto ramp_disable;
+
+        if (enable_shift) {
+                ret = regmap_update_bits(rdev->regmap, S2MPS11_REG_RAMP,
+                                        1 << enable_shift, 1 << enable_shift);
+                if (ret) {
+                        dev_err(&rdev->dev, "failed to enable ramp rate\n");
+                        return ret;
+                }
+        }
+
+        ramp_val = get_ramp_delay(ramp_delay);
+
+        return regmap_update_bits(rdev->regmap, ramp_reg,
+                                  ramp_val << ramp_shift, 1 << ramp_shift);
+
+ramp_disable:
+        return regmap_update_bits(rdev->regmap, S2MPS11_REG_RAMP, 0,
+                                  1 << enable_shift);
+}
+
 static struct regulator_ops s2mps11_ldo_ops = {
         .list_voltage           = regulator_list_voltage_linear,
         .map_voltage            = regulator_map_voltage_linear,
@@ -124,6 +240,7 @@ static struct regulator_ops s2mps11_buck_ops = {
         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
         .set_voltage_time_sel   = s2mps11_regulator_set_voltage_time_sel,
+        .set_ramp_delay         = s2mps11_set_ramp_delay,
 };
 
 #define regulator_desc_ldo1(num)        {               \