regulator: pfuze100: add support to en-/disable switch regulators

Add enable/disable support for switch regulators on pfuze100.

Based on commit 5fe156f1cab4 ("regulator: pfuze100: add enable/disable for
switch") which is reverted due to boot regressions by commit 464a5686e6c9
("regulator: Revert "regulator: pfuze100: add enable/disable for switch"").
Disabling the switch regulators will only be done if the user specifies
"fsl,pfuze-support-disable-sw" in its device tree to keep backward
compatibility with current dtb's [1].

[1] https://patchwork.kernel.org/patch/10490381/

Signed-off-by: Marco Felsch <m.felsch@pengutronix.de>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/drivers/regulator/pfuze100-regulator.c b/drivers/regulator/pfuze100-regulator.c
index cde6eda1d28315a875881c2bfa8a6033469b045c..31c3a236120a80909ede26f29caa5288011d8cbf 100644 (file)
--- a/drivers/regulator/pfuze100-regulator.c
+++ b/drivers/regulator/pfuze100-regulator.c
@@ -17,6 +17,8 @@
 #include <linux/slab.h>
 #include <linux/regmap.h>
 
+#define PFUZE_FLAG_DISABLE_SW  BIT(1)
+
 #define PFUZE_NUMREGS          128
 #define PFUZE100_VOL_OFFSET    0
 #define PFUZE100_STANDBY_OFFSET        1
@@ -50,10 +52,12 @@ struct pfuze_regulator {
        struct regulator_desc desc;
        unsigned char stby_reg;
        unsigned char stby_mask;
+       bool sw_reg;
 };
 
 struct pfuze_chip {
        int     chip_id;
+       int     flags;
        struct regmap *regmap;
        struct device *dev;
        struct pfuze_regulator regulator_descs[PFUZE100_MAX_REGULATOR];
@@ -170,6 +174,17 @@ static const struct regulator_ops pfuze100_sw_regulator_ops = {
        .set_ramp_delay = pfuze100_set_ramp_delay,
 };
 
+static const struct regulator_ops pfuze100_sw_disable_regulator_ops = {
+       .enable = regulator_enable_regmap,
+       .disable = regulator_disable_regmap,
+       .is_enabled = regulator_is_enabled_regmap,
+       .list_voltage = regulator_list_voltage_linear,
+       .set_voltage_sel = regulator_set_voltage_sel_regmap,
+       .get_voltage_sel = regulator_get_voltage_sel_regmap,
+       .set_voltage_time_sel = regulator_set_voltage_time_sel,
+       .set_ramp_delay = pfuze100_set_ramp_delay,
+};
+
 static const struct regulator_ops pfuze100_swb_regulator_ops = {
        .enable = regulator_enable_regmap,
        .disable = regulator_disable_regmap,
@@ -209,9 +224,12 @@ static const struct regulator_ops pfuze100_swb_regulator_ops = {
                        .uV_step = (step),      \
                        .vsel_reg = (base) + PFUZE100_VOL_OFFSET,       \
                        .vsel_mask = 0x3f,      \
+                       .enable_reg = (base) + PFUZE100_MODE_OFFSET,    \
+                       .enable_mask = 0xf,     \
                },      \
                .stby_reg = (base) + PFUZE100_STANDBY_OFFSET,   \
                .stby_mask = 0x3f,      \
+               .sw_reg = true,         \
        }
 
 #define PFUZE100_SWB_REG(_chip, _name, base, mask, voltages)   \
@@ -471,6 +489,9 @@ static int pfuze_parse_regulators_dt(struct pfuze_chip *chip)
        if (!np)
                return -EINVAL;
 
+       if (of_property_read_bool(np, "fsl,pfuze-support-disable-sw"))
+               chip->flags |= PFUZE_FLAG_DISABLE_SW;
+
        parent = of_get_child_by_name(np, "regulators");
        if (!parent) {
                dev_err(dev, "regulators node not found\n");
@@ -703,6 +724,21 @@ static int pfuze100_regulator_probe(struct i2c_client *client,
                        }
                }
 
+               /*
+                * Allow SW regulators to turn off. Checking it trough a flag is
+                * a workaround to keep the backward compatibility with existing
+                * old dtb's which may relay on the fact that we didn't disable
+                * the switched regulator till yet.
+                */
+               if (pfuze_chip->flags & PFUZE_FLAG_DISABLE_SW) {
+                       if (pfuze_chip->regulator_descs[i].sw_reg) {
+                               desc->ops = &pfuze100_sw_disable_regulator_ops;
+                               desc->enable_val = 0x8;
+                               desc->disable_val = 0x0;
+                               desc->enable_time = 500;
+                       }
+               }
+
                config.dev = &client->dev;
                config.init_data = init_data;
                config.driver_data = pfuze_chip;