This driver implements regulator uclass features for fixed value regulators. For getting the basic regulator device-tree node constraints, this driver calls function 'regulator_ofdata_to_platdata()'. The typical fixed regulator node provides few additional properties: - gpio - gpio-open-drain - enable-active-high - startup-delay-us All above are checked and keept in structure of type 'fixed_regulator_priv', which is private for each fixed-regulator device (dev->priv).
The driver implements only three of regulator uclass features: - get_value - get_enable - set_enable
The regulator calls and command line features can be used for fixed-regulator, and the proper error will be returned for prohibited.
Signed-off-by: Przemyslaw Marczak p.marczak@samsung.com
Changes v3: - new file - Kconfig add fixed-regulator entry --- drivers/power/Kconfig | 8 +++ drivers/power/regulator/Makefile | 1 + drivers/power/regulator/fixed.c | 124 +++++++++++++++++++++++++++++++++++++++ 3 files changed, 133 insertions(+) create mode 100644 drivers/power/regulator/fixed.c
diff --git a/drivers/power/Kconfig b/drivers/power/Kconfig index 97abbf0..da1e866 100644 --- a/drivers/power/Kconfig +++ b/drivers/power/Kconfig @@ -120,6 +120,14 @@ config DM_REGULATOR_MAX77686 features for REGULATOR MAX77686. The driver implements get/set api for: value, enable and mode.
+config DM_REGULATOR_FIXED + bool "Enable Driver Model for REGULATOR Fixed value" + depends on DM_REGULATOR + ---help--- + This config enables implementation of driver-model regulator uclass + features for fixed value regulators. The driver implements get/set api + for enable and get only for voltage value. + config AXP221_DCDC1_VOLT int "axp221 dcdc1 voltage" depends on AXP221_POWER diff --git a/drivers/power/regulator/Makefile b/drivers/power/regulator/Makefile index 9d282e3..0a6a6d9 100644 --- a/drivers/power/regulator/Makefile +++ b/drivers/power/regulator/Makefile @@ -5,4 +5,5 @@ # SPDX-License-Identifier: GPL-2.0+ #
+obj-$(CONFIG_DM_REGULATOR_FIXED) += fixed.o obj-$(CONFIG_DM_REGULATOR_MAX77686) += max77686.o diff --git a/drivers/power/regulator/fixed.c b/drivers/power/regulator/fixed.c new file mode 100644 index 0000000..45e9f84 --- /dev/null +++ b/drivers/power/regulator/fixed.c @@ -0,0 +1,124 @@ +/* + * Copyright (C) 2015 Samsung Electronics + * + * Przemyslaw Marczak p.marczak@samsung.com + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <fdtdec.h> +#include <i2c.h> +#include <dm.h> +#include <asm/gpio.h> +#include <power/pmic.h> +#include <power/regulator.h> +#include <errno.h> +#include <dm.h> + +DECLARE_GLOBAL_DATA_PTR; + +struct fixed_regulator_priv { + struct gpio_desc gpio; + bool gpio_open_drain; + bool enable_active_high; + unsigned startup_delay_us; +}; + +static int fixed_regulator_ofdata_to_platdata(struct udevice *dev) +{ + struct dm_regulator_info *info = dev->uclass_priv; + struct fixed_regulator_priv *priv = dev->priv; + int ret, offset = dev->of_offset; + + /* Get the basic regulator constraints */ + ret = regulator_ofdata_to_platdata(dev); + if (ret) { + error("Can't get regulator constraints for %s", dev->name); + return ret; + } + + /* Get fixed regulator gpio desc */ + ret = gpio_request_by_name_nodev(gd->fdt_blob, offset, "gpio", 0, + &priv->gpio, GPIOD_IS_OUT); + if (ret) { + error("Fixed regulator gpio - not found! Error: %d", ret); + return ret; + } + + /* Get fixed regulator addidional constraints */ + priv->gpio_open_drain = fdtdec_get_bool(gd->fdt_blob, offset, + "gpio-open-drain"); + priv->enable_active_high = fdtdec_get_bool(gd->fdt_blob, offset, + "enable-active-high"); + priv->startup_delay_us = fdtdec_get_int(gd->fdt_blob, offset, + "startup-delay-us", 0); + + /* Set type to fixed - used by regulator command */ + info->type = REGULATOR_TYPE_FIXED; + + debug("%s:%d\n", __func__, __LINE__); + debug(" name:%s, boot_on:%d, active_hi: %d start_delay:%u\n", + info->name, info->boot_on, priv->enable_active_high, + priv->startup_delay_us); + + return 0; +} + +static int fixed_regulator_get_value(struct udevice *dev) +{ + struct dm_regulator_info *info; + int ret; + + ret = regulator_info(dev, &info); + if (ret) + return ret; + + if (info->min_uV == info->max_uV) + return info->min_uV; + + error("Invalid constraints for: %s\n", info->name); + + return -EINVAL; +} + +static bool fixed_regulator_get_enable(struct udevice *dev) +{ + struct fixed_regulator_priv *priv = dev->priv; + + return dm_gpio_get_value(&priv->gpio); +} + +static int fixed_regulator_set_enable(struct udevice *dev, bool enable) +{ + struct fixed_regulator_priv *priv = dev->priv; + int ret; + + ret = dm_gpio_set_value(&priv->gpio, enable); + if (ret) { + error("Can't set regulator : %s gpio to: %d\n", dev->name, + enable); + return ret; + } + return 0; +} + +static const struct dm_regulator_ops fixed_regulator_ops = { + .get_value = fixed_regulator_get_value, + .get_enable = fixed_regulator_get_enable, + .set_enable = fixed_regulator_set_enable, +}; + +static const struct udevice_id fixed_regulator_ids[] = { + { .compatible = "regulator-fixed" }, + { }, +}; + +U_BOOT_DRIVER(fixed_regulator) = { + .name = "fixed regulator", + .id = UCLASS_REGULATOR, + .ops = &fixed_regulator_ops, + .of_match = fixed_regulator_ids, + .ofdata_to_platdata = fixed_regulator_ofdata_to_platdata, + .priv_auto_alloc_size = sizeof(struct fixed_regulator_priv), +};