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authorHans de Goede <hdegoede@redhat.com>2014-06-13 22:55:51 +0200
committerIan Campbell <ijc@hellion.org.uk>2014-07-18 19:42:16 +0100
commit24289208354c143967968755cff5c825a12e3f90 (patch)
tree3a2fecd8b1e62d47e107cf507912ce3a00f64002 /drivers
parent14bc66bd9a1d8073a12c6e785ab379909f620356 (diff)
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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>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/power/Makefile1
-rw-r--r--drivers/power/axp152.c97
2 files changed, 98 insertions, 0 deletions
diff --git a/drivers/power/Makefile b/drivers/power/Makefile
index 063ac8f..dc64e4d 100644
--- a/drivers/power/Makefile
+++ b/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
diff --git a/drivers/power/axp152.c b/drivers/power/axp152.c
new file mode 100644
index 0000000..fa4ea05
--- /dev/null
+++ b/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;
+}