[PATCH] regulator: pfuze100-regulator: add coin support

George McCollister
2017-03-09T14:14:43Z

Add support for PF0200 coin cell/super capacitor charger which works as
a current limited voltage source via the LICELL pin. When VIN goes below
a certain threshold LICELL is used to provide power for VSNVS which is
usually used to hold up secure non-volatile storage and the real-time
clock on the SoC.

Signed-off-by: George McCollister <george.mccollister-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
.../devicetree/bindings/regulator/pfuze100.txt | 8 +++++++-
drivers/regulator/pfuze100-regulator.c | 24 ++++++++++++++++++++++
include/linux/regulator/pfuze100.h | 1 +
3 files changed, 32 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/regulator/pfuze100.txt b/Documentation/devicetree/bindings/regulator/pfuze100.txt
index 9b40db88f637..444c47831a40 100644
--- a/Documentation/devicetree/bindings/regulator/pfuze100.txt
+++ b/Documentation/devicetree/bindings/regulator/pfuze100.txt
@@ -13,7 +13,7 @@ Required child node:
--PFUZE100
sw1ab,sw1c,sw2,sw3a,sw3b,sw4,swbst,vsnvs,vrefddr,vgen1~vgen6
--PFUZE200
- sw1ab,sw2,sw3a,sw3b,swbst,vsnvs,vrefddr,vgen1~vgen6
+ sw1ab,sw2,sw3a,sw3b,swbst,vsnvs,vrefddr,vgen1~vgen6,coin
--PFUZE3000
sw1a,sw1b,sw2,sw3,swbst,vsnvs,vrefddr,vldo1,vldo2,vccsd,v33,vldo3,vldo4

@@ -205,6 +205,12 @@ Example 2: PFUZE200
regulator-max-microvolt = <3300000>;
regulator-always-on;
};
+
+ coin_reg: coin {
+ regulator-min-microvolt = <2500000>;
+ regulator-max-microvolt = <3300000>;
+ regulator-always-on;
+ };
};
};

diff --git a/drivers/regulator/pfuze100-regulator.c b/drivers/regulator/pfuze100-regulator.c
index e193bbbb8ffc..63922a2167e5 100644
--- a/drivers/regulator/pfuze100-regulator.c
+++ b/drivers/regulator/pfuze100-regulator.c
@@ -40,6 +40,7 @@
#define PFUZE100_REVID 0x3
#define PFUZE100_FABID 0x4

+#define PFUZE100_COINVOL 0x1a
#define PFUZE100_SW1ABVOL 0x20
#define PFUZE100_SW1CVOL 0x2e
#define PFUZE100_SW2VOL 0x35
@@ -81,6 +82,10 @@ static const int pfuze100_vsnvs[] = {
1000000, 1100000, 1200000, 1300000, 1500000, 1800000, 3000000,
};

+static const int pfuze100_coin[] = {
+ 2500000, 2700000, 2800000, 2900000, 3000000, 3100000, 3200000, 3300000,
+};
+
static const int pfuze3000_sw2lo[] = {
1500000, 1550000, 1600000, 1650000, 1700000, 1750000, 1800000, 1850000,
};
@@ -230,6 +235,23 @@ static const struct regulator_ops pfuze100_swb_regulator_ops = {
.stby_mask = 0x20, \
}

+#define PFUZE100_COIN_REG(_chip, _name, base, mask, voltages) \
+ [_chip ## _ ## _name] = { \
+ .desc = { \
+ .name = #_name, \
+ .n_voltages = ARRAY_SIZE(voltages), \
+ .ops = &pfuze100_swb_regulator_ops, \
+ .type = REGULATOR_VOLTAGE, \
+ .id = _chip ## _ ## _name, \
+ .owner = THIS_MODULE, \
+ .volt_table = voltages, \
+ .vsel_reg = (base), \
+ .vsel_mask = (mask), \
+ .enable_reg = (base), \
+ .enable_mask = 0x8, \
+ }, \
+ }
+
#define PFUZE3000_VCC_REG(_chip, _name, base, min, max, step) { \
.desc = { \
.name = #_name, \
@@ -317,6 +339,7 @@ static struct pfuze_regulator pfuze200_regulators[] = {
PFUZE100_VGEN_REG(PFUZE200, VGEN4, PFUZE100_VGEN4VOL, 1800000, 3300000, 100000),
PFUZE100_VGEN_REG(PFUZE200, VGEN5, PFUZE100_VGEN5VOL, 1800000, 3300000, 100000),
PFUZE100_VGEN_REG(PFUZE200, VGEN6, PFUZE100_VGEN6VOL, 1800000, 3300000, 100000),
+ PFUZE100_COIN_REG(PFUZE200, COIN, PFUZE100_COINVOL, 0x7, pfuze100_coin),
};

static struct pfuze_regulator pfuze3000_regulators[] = {
@@ -371,6 +394,7 @@ static struct of_regulator_match pfuze200_matches[] = {
{ .name = "vgen4", },
{ .name = "vgen5", },
{ .name = "vgen6", },
+ { .name = "coin", },
};

/* PFUZE3000 */
diff --git a/include/linux/regulator/pfuze100.h b/include/linux/regulator/pfuze100.h
index 70c6c66c5bcf..e0ccf46f66cf 100644
--- a/include/linux/regulator/pfuze100.h
+++ b/include/linux/regulator/pfuze100.h
@@ -48,6 +48,7 @@
#define PFUZE200_VGEN4 10
#define PFUZE200_VGEN5 11
#define PFUZE200_VGEN6 12
+#define PFUZE200_COIN 13

#define PFUZE3000_SW1A 0
#define PFUZE3000_SW1B 1
--
2.11.0

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