power: Add support for LTC3676 PMIC

The LTC3676 PMIC includes four DC/DC converters, and three 300mA
LDO Regulators (two Adjustable). The DC/DC converters are adjustable based
on a resistor devider (board-specific).

This adds support for the LTC3676 by creating a namespace unique init function
that uses the PMIC API to allocate a pmic and defines the registers.

Signed-off-by: Tim Harvey <tharvey@gateworks.com>
Acked-by: Stefano Babic <sbabic@denx.de>

diff --git a/drivers/power/pmic/Makefile b/drivers/power/pmic/Makefile
index 4129bdabfbef945c22fe50f1c0a72ed93a39fdd2..920bbdce6ef3938f08198133036be09b6c4bb57a 100644 (file)
--- a/drivers/power/pmic/Makefile
+++ b/drivers/power/pmic/Makefile
@@ -5,6 +5,7 @@
 # SPDX-License-Identifier:     GPL-2.0+
 #
 
+obj-$(CONFIG_POWER_LTC3676) += pmic_ltc3676.o
 obj-$(CONFIG_POWER_MAX8998) += pmic_max8998.o
 obj-$(CONFIG_POWER_MAX8997) += pmic_max8997.o
 obj-$(CONFIG_POWER_MUIC_MAX8997) += muic_max8997.o

diff --git a/drivers/power/pmic/pmic_ltc3676.c b/drivers/power/pmic/pmic_ltc3676.c
new file mode 100644 (file)
index 0000000..9b874cb
--- /dev/null
+++ b/drivers/power/pmic/pmic_ltc3676.c
@@ -0,0 +1,32 @@
+/*
+ * Copyright (C) 2014 Gateworks Corporation
+ * Tim Harvey <tharvey@gateworks.com>
+ *
+ * SPDX-License-Identifier:      GPL-2.0+
+ */
+
+#include <common.h>
+#include <errno.h>
+#include <i2c.h>
+#include <power/pmic.h>
+#include <power/ltc3676_pmic.h>
+
+int power_ltc3676_init(unsigned char bus)
+{
+       static const char name[] = "LTC3676_PMIC";
+       struct pmic *p = pmic_alloc();
+
+       if (!p) {
+               printf("%s: POWER allocation error!\n", __func__);
+               return -ENOMEM;
+       }
+
+       p->name = name;
+       p->interface = PMIC_I2C;
+       p->number_of_regs = LTC3676_NUM_OF_REGS;
+       p->hw.i2c.addr = CONFIG_POWER_LTC3676_I2C_ADDR;
+       p->hw.i2c.tx_num = 1;
+       p->bus = bus;
+
+       return 0;
+}

diff --git a/include/power/ltc3676_pmic.h b/include/power/ltc3676_pmic.h
new file mode 100644 (file)
index 0000000..dcaa985
--- /dev/null
+++ b/include/power/ltc3676_pmic.h
@@ -0,0 +1,51 @@
+/*
+ *  Copyright (C) 2014 Gateworks Corporation
+ *  Tim Harvey <tharvey@gateworks.com>
+ *
+ * SPDX-License-Identifier:     GPL-2.0+
+ */
+
+#ifndef __LTC3676_PMIC_H_
+#define __LTC3676_PMIC_H_
+
+/* LTC3676 registers */
+enum {
+       LTC3676_BUCK1   = 0x01,
+       LTC3676_BUCK2   = 0x02,
+       LTC3676_BUCK3   = 0x03,
+       LTC3676_BUCK4   = 0x04,
+       LTC3676_LDOA    = 0x05,
+       LTC3676_LDOB    = 0x06,
+       LTC3676_SQD1    = 0x07,
+       LTC3676_SQD2    = 0x08,
+       LTC3676_CNTRL   = 0x09,
+       LTC3676_DVB1A   = 0x0A,
+       LTC3676_DVB1B   = 0x0B,
+       LTC3676_DVB2A   = 0x0C,
+       LTC3676_DVB2B   = 0x0D,
+       LTC3676_DVB3A   = 0x0E,
+       LTC3676_DVB3B   = 0x0F,
+       LTC3676_DVB4A   = 0x10,
+       LTC3676_DVB4B   = 0x11,
+       LTC3676_MSKIRQ  = 0x12,
+       LTC3676_MSKPG   = 0x13,
+       LTC3676_USER    = 0x14,
+       LTC3676_HRST    = 0x1E,
+       LTC3676_CLIRQ   = 0x1F,
+       LTC3676_IRQSTAT = 0x15,
+       LTC3676_PGSTATL = 0x16,
+       LTC3676_PGSTATR = 0x17,
+       LTC3676_NUM_OF_REGS = 0x20,
+};
+
+/*
+ * SW Configuration
+ */
+
+#define LTC3676_DVB_MASK       0x1f
+#define LTC3676_PGOOD_MASK     (1<<5)
+#define LTC3676_REF_SELA       (0<<5)
+#define LTC3676_REF_SELB       (1<<5)
+
+int power_ltc3676_init(unsigned char bus);
+#endif