sunxi: Add axp152 pmic support

Add support for the x-powers axp152 pmic which is found on most A10s boards
and enable it for the r7-tv-dongle board.

Signed-off-by: Henrik Nordstrom <henrik@henriknordstrom.net>
Signed-off-by: Ian Campbell <ijc@hellion.org.uk>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Ian Campbell <ijc@hellion.org.uk>

board/sunxi/board.c

@@ -12,6 +12,9 @@
  */
 
 #include <common.h>
+#ifdef CONFIG_AXP152_POWER
+#include <axp152.h>
+#endif
 #ifdef CONFIG_AXP209_POWER
 #include <axp209.h>
 #endif
@@ -122,6 +125,13 @@ void sunxi_board_init(void)
 	int power_failed = 0;
 	unsigned long ramsize;
 
+#ifdef CONFIG_AXP152_POWER
+	power_failed = axp152_init();
+	power_failed |= axp152_set_dcdc2(1400);
+	power_failed |= axp152_set_dcdc3(1500);
+	power_failed |= axp152_set_dcdc4(1250);
+	power_failed |= axp152_set_ldo2(3000);
+#endif
 #ifdef CONFIG_AXP209_POWER
 	power_failed |= axp209_init();
 	power_failed |= axp209_set_dcdc2(1400);

boards.cfg

@@ -381,7 +381,7 @@ Active  arm         armv7          sunxi       -               sunxi
 Active  arm         armv7          sunxi       -               sunxi               Cubieboard                            sun4i:CUBIEBOARD,SPL,AXP209_POWER,SUNXI_EMAC                                                                                      Hans de Goede <hdegoede@redhat.com>
 Active  arm         armv7          sunxi       -               sunxi               Cubietruck                            sun7i:CUBIETRUCK,SPL,AXP209_POWER,SUNXI_GMAC,RGMII                                                                                Ian Campbell <ijc@hellion.org.uk>:Hans de Goede <hdegoede@redhat.com>
 Active  arm         armv7          sunxi       -               sunxi               Cubietruck_FEL                        sun7i:CUBIETRUCK,SPL_FEL,AXP209_POWER,SUNXI_GMAC,RGMII                                                                            Ian Campbell <ijc@hellion.org.uk>:Hans de Goede <hdegoede@redhat.com>
-Active  arm         armv7          sunxi       -               sunxi               r7-tv-dongle                          sun5i:R7DONGLE,SPL                                                                                                                Hans de Goede <hdegoede@redhat.com>
+Active  arm         armv7          sunxi       -               sunxi               r7-tv-dongle                          sun5i:R7DONGLE,SPL,AXP152_POWER                                                                                                   Hans de Goede <hdegoede@redhat.com>
 Active  arm         armv7          u8500       st-ericsson     snowball            snowball                              -                                                                                                                                 Mathieu Poirier <mathieu.poirier@linaro.org>
 Active  arm         armv7          u8500       st-ericsson     u8500               u8500_href                            -                                                                                                                                 -
 Active  arm         armv7          vf610       freescale       vf610twr            vf610twr                              vf610twr:IMX_CONFIG=board/freescale/vf610twr/imximage.cfg                                                                         Alison Wang <b18965@freescale.com>

drivers/power/Makefile

@@ -5,6 +5,7 @@
 # SPDX-License-Identifier:	GPL-2.0+
 #
 
+obj-$(CONFIG_AXP152_POWER)	+= axp152.o
 obj-$(CONFIG_AXP209_POWER)	+= axp209.o
 obj-$(CONFIG_EXYNOS_TMU)	+= exynos-tmu.o
 obj-$(CONFIG_FTPMU010_POWER)	+= ftpmu010.o

drivers/power/axp152.c

@@ -0,0 +1,97 @@
+/*
+ * (C) Copyright 2012
+ * Henrik Nordstrom <henrik@henriknordstrom.net>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+#include <common.h>
+#include <i2c.h>
+#include <axp152.h>
+
+enum axp152_reg {
+	AXP152_CHIP_VERSION = 0x3,
+	AXP152_DCDC2_VOLTAGE = 0x23,
+	AXP152_DCDC3_VOLTAGE = 0x27,
+	AXP152_DCDC4_VOLTAGE = 0x2B,
+	AXP152_LDO2_VOLTAGE = 0x2A,
+	AXP152_SHUTDOWN = 0x32,
+};
+
+#define AXP152_POWEROFF			(1 << 7)
+
+static int axp152_write(enum axp152_reg reg, u8 val)
+{
+	return i2c_write(0x30, reg, 1, &val, 1);
+}
+
+static int axp152_read(enum axp152_reg reg, u8 *val)
+{
+	return i2c_read(0x30, reg, 1, val, 1);
+}
+
+static u8 axp152_mvolt_to_target(int mvolt, int min, int max, int div)
+{
+	if (mvolt < min)
+		mvolt = min;
+	else if (mvolt > max)
+		mvolt = max;
+
+	return (mvolt - min) / div;
+}
+
+int axp152_set_dcdc2(int mvolt)
+{
+	int rc;
+	u8 current, target;
+
+	target = axp152_mvolt_to_target(mvolt, 700, 2275, 25);
+
+	/* Do we really need to be this gentle? It has built-in voltage slope */
+	while ((rc = axp152_read(AXP152_DCDC2_VOLTAGE, &current)) == 0 &&
+	       current != target) {
+		if (current < target)
+			current++;
+		else
+			current--;
+		rc = axp152_write(AXP152_DCDC2_VOLTAGE, current);
+		if (rc)
+			break;
+	}
+	return rc;
+}
+
+int axp152_set_dcdc3(int mvolt)
+{
+	u8 target = axp152_mvolt_to_target(mvolt, 700, 3500, 25);
+
+	return axp152_write(AXP152_DCDC3_VOLTAGE, target);
+}
+
+int axp152_set_dcdc4(int mvolt)
+{
+	u8 target = axp152_mvolt_to_target(mvolt, 700, 3500, 25);
+
+	return axp152_write(AXP152_DCDC4_VOLTAGE, target);
+}
+
+int axp152_set_ldo2(int mvolt)
+{
+	u8 target = axp152_mvolt_to_target(mvolt, 700, 3500, 100);
+
+	return axp152_write(AXP152_LDO2_VOLTAGE, target);
+}
+
+int axp152_init(void)
+{
+	u8 ver;
+	int rc;
+
+	rc = axp152_read(AXP152_CHIP_VERSION, &ver);
+	if (rc)
+		return rc;
+
+	if (ver != 0x05)
+		return -1;
+
+	return 0;
+}

include/axp152.h

@@ -0,0 +1,10 @@
+/*
+ * (C) Copyright 2012 Henrik Nordstrom <henrik@henriknordstrom.net>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+int axp152_set_dcdc2(int mvolt);
+int axp152_set_dcdc3(int mvolt);
+int axp152_set_dcdc4(int mvolt);
+int axp152_set_ldo2(int mvolt);
+int axp152_init(void);