power: Add support for ACT8846 PMIC

Add a driver for the ACT8846 PMIC. This supports several LDOs and BUCKs and
is connected to the I2C bus. This driver supports using a regulator driver
to access the regulators.

Signed-off-by: Simon Glass <sjg@chromium.org>

diff --git a/drivers/power/pmic/Kconfig b/drivers/power/pmic/Kconfig
index fc6a3743dc964d5121cdf419f8c1b602b9e422e8..547fd1aaa6a0d7ee0ece5ddbd15b5551f9fe9cd7 100644 (file)
--- a/drivers/power/pmic/Kconfig
+++ b/drivers/power/pmic/Kconfig
@@ -10,6 +10,15 @@ config DM_PMIC
        - 'drivers/power/pmic/pmic-uclass.c'
        - 'include/power/pmic.h'
 
+config PMIC_ACT8846
+       bool "Enable support for the active-semi 8846 PMIC"
+       depends on DM_PMIC && DM_I2C
+       ---help---
+       This PMIC includes 4 DC/DC step-down buck regulators and 8 low-dropout
+       regulators (LDOs). It also provides some GPIO, reset and battery
+       functions. It uses an I2C interface and is designed for use with
+       tablets and smartphones.
+
 config DM_PMIC_PFUZE100
        bool "Enable Driver Model for PMIC PFUZE100"
        depends on DM_PMIC

diff --git a/drivers/power/pmic/Makefile b/drivers/power/pmic/Makefile
index 99c5778334a4350bf1b52b8aeb4ade0095d35c99..8f6463e127811ed76a56f97d41805d666a17ac99 100644 (file)
--- a/drivers/power/pmic/Makefile
+++ b/drivers/power/pmic/Makefile
@@ -9,6 +9,7 @@ obj-$(CONFIG_DM_PMIC) += pmic-uclass.o
 obj-$(CONFIG_DM_PMIC_MAX77686) += max77686.o
 obj-$(CONFIG_DM_PMIC_PFUZE100) += pfuze100.o
 obj-$(CONFIG_DM_PMIC_SANDBOX) += sandbox.o i2c_pmic_emul.o
+obj-$(CONFIG_PMIC_ACT8846) += act8846.o
 obj-$(CONFIG_PMIC_TPS65090) += tps65090.o
 obj-$(CONFIG_PMIC_S5M8767) += s5m8767.o
 

diff --git a/drivers/power/pmic/act8846.c b/drivers/power/pmic/act8846.c
new file mode 100644 (file)
index 0000000..ff096b3
--- /dev/null
+++ b/drivers/power/pmic/act8846.c
@@ -0,0 +1,90 @@
+/*
+ * Copyright (C) 2015 Google, Inc
+ * Written by Simon Glass <sjg@chromium.org>
+ *
+ * SPDX-License-Identifier:    GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <fdtdec.h>
+#include <libfdt.h>
+#include <power/act8846_pmic.h>
+#include <power/pmic.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+static const struct pmic_child_info pmic_children_info[] = {
+       { .prefix = "REG", .driver = "act8846_reg"},
+       { },
+};
+
+static int act8846_reg_count(struct udevice *dev)
+{
+       return ACT8846_NUM_OF_REGS;
+}
+
+static int act8846_write(struct udevice *dev, uint reg, const uint8_t *buff,
+                         int len)
+{
+       if (dm_i2c_write(dev, reg, buff, len)) {
+               debug("write error to device: %p register: %#x!", dev, reg);
+               return -EIO;
+       }
+
+       return 0;
+}
+
+static int act8846_read(struct udevice *dev, uint reg, uint8_t *buff, int len)
+{
+       if (dm_i2c_read(dev, reg, buff, len)) {
+               debug("read error from device: %p register: %#x!", dev, reg);
+               return -EIO;
+       }
+
+       return 0;
+}
+
+static int act8846_bind(struct udevice *dev)
+{
+       const void *blob = gd->fdt_blob;
+       int regulators_node;
+       int children;
+
+       regulators_node = fdt_subnode_offset(blob, dev->of_offset,
+                                            "regulators");
+       if (regulators_node <= 0) {
+               debug("%s: %s regulators subnode not found!", __func__,
+                     dev->name);
+               return -ENXIO;
+       }
+
+       debug("%s: '%s' - found regulators subnode\n", __func__, dev->name);
+
+       children = pmic_bind_children(dev, regulators_node, pmic_children_info);
+       if (!children)
+               debug("%s: %s - no child found\n", __func__, dev->name);
+
+       /* Always return success for this device */
+       return 0;
+}
+
+static struct dm_pmic_ops act8846_ops = {
+       .reg_count = act8846_reg_count,
+       .read = act8846_read,
+       .write = act8846_write,
+};
+
+static const struct udevice_id act8846_ids[] = {
+       { .compatible = "active-semi,act8846" },
+       { }
+};
+
+U_BOOT_DRIVER(pmic_act8846) = {
+       .name = "act8846 pmic",
+       .id = UCLASS_PMIC,
+       .of_match = act8846_ids,
+       .bind = act8846_bind,
+       .ops = &act8846_ops,
+};

diff --git a/include/power/act8846_pmic.h b/include/power/act8846_pmic.h
new file mode 100644 (file)
index 0000000..a811f28
--- /dev/null
+++ b/include/power/act8846_pmic.h
@@ -0,0 +1,37 @@
+/*
+ * Copyright (C) 2015 Google, Inc
+ * Written by Simon Glass <sjg@chromium.org>
+ *
+ * SPDX-License-Identifier:    GPL-2.0+
+ */
+
+#ifndef _PMIC_ACT8846_H_
+#define _PMIC_ACT8846_H_
+
+#include <asm/gpio.h>
+
+#define ACT8846_NUM_OF_REGS    12
+
+#define BUCK_VOL_MASK 0x3f
+#define LDO_VOL_MASK 0x3f
+
+#define BUCK_EN_MASK 0x80
+#define LDO_EN_MASK 0x80
+
+#define VOL_MIN_IDX 0x00
+#define VOL_MAX_IDX 0x3f
+
+struct  act8846_reg_table {
+       char    *name;
+       char    reg_ctl;
+       char    reg_vol;
+};
+
+struct pmic_act8846 {
+       struct pmic *pmic;
+       int node;       /*device tree node*/
+       struct gpio_desc pwr_hold;
+       struct udevice *dev;
+};
+
+#endif