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 ---
Changes in v3: None Changes in v2: None
drivers/power/pmic/Kconfig | 9 +++++ drivers/power/pmic/Makefile | 1 + drivers/power/pmic/act8846.c | 90 ++++++++++++++++++++++++++++++++++++++++++++ include/power/act8846_pmic.h | 37 ++++++++++++++++++ 4 files changed, 137 insertions(+) create mode 100644 drivers/power/pmic/act8846.c create mode 100644 include/power/act8846_pmic.h
diff --git a/drivers/power/pmic/Kconfig b/drivers/power/pmic/Kconfig index 164f421..0047a4c 100644 --- 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_MAX77686 bool "Enable Driver Model for PMIC MAX77686" depends on DM_PMIC diff --git a/drivers/power/pmic/Makefile b/drivers/power/pmic/Makefile index ae86f04..4d62288 100644 --- a/drivers/power/pmic/Makefile +++ b/drivers/power/pmic/Makefile @@ -8,6 +8,7 @@ obj-$(CONFIG_DM_PMIC) += pmic-uclass.o obj-$(CONFIG_DM_PMIC_MAX77686) += max77686.o obj-$(CONFIG_DM_PMIC_SANDBOX) += sandbox.o i2c_pmic_emul.o +obj-$(CONFIG_PMIC_ACT8846) += act8846.o obj-$(CONFIG_POWER_LTC3676) += pmic_ltc3676.o obj-$(CONFIG_POWER_MAX8998) += pmic_max8998.o obj-$(CONFIG_POWER_MAX8997) += pmic_max8997.o diff --git a/drivers/power/pmic/act8846.c b/drivers/power/pmic/act8846.c new file mode 100644 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 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