ARM: ux500: Setup external regulator supply #2 for HREF v20 boards

v20 HREFs require non-standard configuration of EXT_SUPPLY2 to
function correctly (specific information is commented). Here we make
use of the recently added mechanism to adapt initialisation values
for such use-cases.
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

arch/arm/mach-ux500/board-mop500-regulators.c

@@ -510,4 +510,32 @@ void mop500_regulator_init(void)
 		regulator->constraints.state_mem.disabled = 1;
 		regulator->constraints.state_standby.disabled = 1;
 	}
+
+	/*
+	 * Handle AB8500_EXT_SUPPLY2 on HREFP_V20_V50 boards (do it for
+	 * all HREFP_V20 boards)
+	 */
+	if (cpu_is_u8500v20()) {
+		/* VextSupply2RequestCtrl =  HP/OFF depending on VxRequest */
+		ab8500_modify_reg_init(AB8500_REGUREQUESTCTRL3, 0x01, 0x01);
+
+		/* VextSupply2SysClkReq1HPValid = SysClkReq1 controlled */
+		ab8500_modify_reg_init(AB8500_REGUSYSCLKREQ1HPVALID2,
+			0x20, 0x20);
+
+		/* VextSupply2 = force HP at initialization */
+		ab8500_modify_reg_init(AB8500_EXTSUPPLYREGU, 0x0c, 0x04);
+
+		/* enable VextSupply2 during platform active */
+		regulator = &ab8500_ext_regulators[AB8500_EXT_SUPPLY2];
+		regulator->constraints.always_on = 1;
+
+		/* disable VextSupply2 in suspend */
+		regulator = &ab8500_ext_regulators[AB8500_EXT_SUPPLY2];
+		regulator->constraints.state_mem.disabled = 1;
+		regulator->constraints.state_standby.disabled = 1;
+
+		/* enable VextSupply2 HW control (used in suspend) */
+		regulator->driver_data = (void *)&ab8500_ext_supply2;
+	}
 }