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 <[e-mail]>
Signed-off-by: Mark Brown <[e-mail]>

Documentation/devicetree/bindings/regulator/pfuze100.txt

···
   --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
 
···
 
 			vgen6_reg: vgen6 {
 				regulator-min-microvolt = <1800000>;
+				regulator-max-microvolt = <3300000>;
+				regulator-always-on;
+			};
+
+			coin_reg: coin {
+				regulator-min-microvolt = <2500000>;
 				regulator-max-microvolt = <3300000>;
 				regulator-always-on;
 			};

drivers/regulator/pfuze100-regulator.c

···
 #define PFUZE100_REVID		0x3
 #define PFUZE100_FABID		0x4
 
+#define PFUZE100_COINVOL	0x1a
 #define PFUZE100_SW1ABVOL	0x20
 #define PFUZE100_SW1CVOL	0x2e
 #define PFUZE100_SW2VOL		0x35
···
 
 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[] = {
···
 		.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,	\
···
 	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[] = {
···
 	{ .name = "vgen4",	},
 	{ .name = "vgen5",	},
 	{ .name = "vgen6",	},
+	{ .name = "coin",	},
 };
 
 /* PFUZE3000 */

include/linux/regulator/pfuze100.h

···
 #define PFUZE200_VGEN4		10
 #define PFUZE200_VGEN5		11
 #define PFUZE200_VGEN6		12
+#define PFUZE200_COIN		13
 
 #define PFUZE3000_SW1A		0
 #define PFUZE3000_SW1B		1