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Date: Sat, 29 Jun 2013 18:21:16 +0530
From: Yadwinder Singh Brar <yadi.brar@...sung.com>
To: linux-kernel@...r.kernel.org
Cc: sbkim73@...sung.com, broonie@...nel.org, lgirdwood@...il.com,
sameo@...ux.intel.com, rob.herring@...xeda.com,
grant.likely@...aro.org, sachin.kamat@...aro.org,
yadi.brar01@...il.com, Yadwinder Singh Brar <yadi.brar@...sung.com>
Subject: [v2 PATCH 2/6] 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@...sung.com>
---
drivers/regulator/s2mps11.c | 117 +++++++++++++++++++++++++++++++++++
include/linux/mfd/samsung/s2mps11.h | 11 +++
2 files changed, 128 insertions(+), 0 deletions(-)
diff --git a/drivers/regulator/s2mps11.c b/drivers/regulator/s2mps11.c
index a671eb6..4bebcb6 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) { \
diff --git a/include/linux/mfd/samsung/s2mps11.h b/include/linux/mfd/samsung/s2mps11.h
index 4e94dc6..d0d52ea 100644
--- a/include/linux/mfd/samsung/s2mps11.h
+++ b/include/linux/mfd/samsung/s2mps11.h
@@ -191,6 +191,17 @@ enum s2mps11_regulators {
#define S2MPS11_BUCK_N_VOLTAGES (S2MPS11_BUCK_VSEL_MASK + 1)
#define S2MPS11_RAMP_DELAY 25000 /* uV/us */
+
+#define S2MPS11_BUCK2_RAMP_SHIFT 6
+#define S2MPS11_BUCK34_RAMP_SHIFT 4
+#define S2MPS11_BUCK5_RAMP_SHIFT 6
+#define S2MPS11_BUCK16_RAMP_SHIFT 4
+#define S2MPS11_BUCK7810_RAMP_SHIFT 2
+#define S2MPS11_BUCK9_RAMP_SHIFT 0
+#define S2MPS11_BUCK2_RAMP_EN_SHIFT 3
+#define S2MPS11_BUCK3_RAMP_EN_SHIFT 2
+#define S2MPS11_BUCK4_RAMP_EN_SHIFT 1
+#define S2MPS11_BUCK6_RAMP_EN_SHIFT 0
#define S2MPS11_PMIC_EN_SHIFT 6
#define S2MPS11_REGULATOR_MAX (S2MPS11_REG_MAX - 3)
--
1.7.0.4
--
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