regulator: pfuze100-regulator: add coin support

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@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/Documentation/devicetree/bindings/regulator/pfuze100.txt b/Documentation/devicetree/bindings/regulator/pfuze100.txt
index 9b40db88f637bd9ed7f06c5eb809e7b16ddd660d..444c47831a408c6b24d908f707117d7d3788cfde 100644 (file)
--- 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 cb18b5c4f2db967e05713d7a29dd0433ea4f778a..716abcc834c8be4b8ec59aadeb1e50d3c97c3ece 100644 (file)
--- 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 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 70c6c66c5bcf16cc4be324a1aaf40b1981e56413..e0ccf46f66cf34ae44296de9410fa107270aff4e 100644 (file)
--- 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