power: Add support for the TPS65218 PMIC
Add a driver for the TPS65218 PMIC which is used by TI AM43xx SoCs and
may be used by TI AM335x SoCs.
Signed-off-by: Tom Rini <trini@ti.com>
diff --git a/drivers/power/pmic/Makefile b/drivers/power/pmic/Makefile
index 9a8bfe0..a472f61 100644
--- a/drivers/power/pmic/Makefile
+++ b/drivers/power/pmic/Makefile
@@ -13,4 +13,5 @@
obj-$(CONFIG_POWER_PFUZE100) += pmic_pfuze100.o
obj-$(CONFIG_POWER_TPS65090) += pmic_tps65090.o
obj-$(CONFIG_POWER_TPS65217) += pmic_tps65217.o
+obj-$(CONFIG_POWER_TPS65218) += pmic_tps65218.o
obj-$(CONFIG_POWER_TPS65910) += pmic_tps65910.o
diff --git a/drivers/power/pmic/pmic_tps65218.c b/drivers/power/pmic/pmic_tps65218.c
new file mode 100644
index 0000000..0952456
--- /dev/null
+++ b/drivers/power/pmic/pmic_tps65218.c
@@ -0,0 +1,97 @@
+/*
+ * (C) Copyright 2011-2013
+ * Texas Instruments, <www.ti.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <i2c.h>
+#include <power/tps65218.h>
+
+/**
+ * tps65218_reg_write() - Generic function that can write a TPS65218 PMIC
+ * register or bit field regardless of protection
+ * level.
+ *
+ * @prot_level: Register password protection. Use
+ * TPS65218_PROT_LEVEL_NONE,
+ * TPS65218_PROT_LEVEL_1 or TPS65218_PROT_LEVEL_2
+ * @dest_reg: Register address to write.
+ * @dest_val: Value to write.
+ * @mask: Bit mask (8 bits) to be applied. Function will only
+ * change bits that are set in the bit mask.
+ *
+ * @return: 0 for success, not 0 on failure, as per the i2c API
+ */
+int tps65218_reg_write(uchar prot_level, uchar dest_reg, uchar dest_val,
+ uchar mask)
+{
+ uchar read_val;
+ uchar xor_reg;
+ int ret;
+
+ /*
+ * If we are affecting only a bit field, read dest_reg and apply the
+ * mask
+ */
+ if (mask != TPS65218_MASK_ALL_BITS) {
+ ret = i2c_read(TPS65218_CHIP_PM, dest_reg, 1, &read_val, 1);
+ if (ret)
+ return ret;
+ read_val &= (~mask);
+ read_val |= (dest_val & mask);
+ dest_val = read_val;
+ }
+
+ if (prot_level > 0) {
+ xor_reg = dest_reg ^ TPS65218_PASSWORD_UNLOCK;
+ ret = i2c_write(TPS65218_CHIP_PM, TPS65218_PASSWORD, 1,
+ &xor_reg, 1);
+ if (ret)
+ return ret;
+ }
+
+ ret = i2c_write(TPS65218_CHIP_PM, dest_reg, 1, &dest_val, 1);
+ if (ret)
+ return ret;
+
+ if (prot_level == TPS65218_PROT_LEVEL_2) {
+ ret = i2c_write(TPS65218_CHIP_PM, TPS65218_PASSWORD, 1,
+ &xor_reg, 1);
+ if (ret)
+ return ret;
+
+ ret = i2c_write(TPS65218_CHIP_PM, dest_reg, 1, &dest_val, 1);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
+/**
+ * tps65218_voltage_update() - Function to change a voltage level, as this
+ * is a multi-step process.
+ * @dc_cntrl_reg: DC voltage control register to change.
+ * @volt_sel: New value for the voltage register
+ * @return: 0 for success, not 0 on failure.
+ */
+int tps65218_voltage_update(uchar dc_cntrl_reg, uchar volt_sel)
+{
+ if ((dc_cntrl_reg != TPS65218_DCDC1) &&
+ (dc_cntrl_reg != TPS65218_DCDC2))
+ return 1;
+
+ /* set voltage level */
+ if (tps65218_reg_write(TPS65218_PROT_LEVEL_2, dc_cntrl_reg, volt_sel,
+ TPS65218_MASK_ALL_BITS))
+ return 1;
+
+ /* set GO bit to initiate voltage transition */
+ if (tps65218_reg_write(TPS65218_PROT_LEVEL_2, TPS65218_SLEW,
+ TPS65218_DCDC_GO, TPS65218_DCDC_GO))
+ return 1;
+
+ return 0;
+}