This driver implements regulator operations for fixed Voltage/Current value regulators. beside the standard regulator constraints, which are put into the uclass platform data, a typical fixed regulator node provides few additional properties like: - gpio - gpio-open-drain - enable-active-high - startup-delay-us The only 'gpio' is used by this driver and is kept in structure of type 'fixed_regulator_platdata', as a device platform data (dev->platdata). The driver implements: - get_value - get_current - get_enable - set_enable The regulator calls and commands can be used for fixed-regulator devices, and the proper error will be returned for prohibited. Signed-off-by: Przemyslaw Marczak <p.marczak@samsung.com> Acked-by: Simon Glass <sjg@chromium.org>master
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Fixed Voltage regulator |
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Binding: |
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The binding is done by the property "compatible" - this is different, than for |
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binding by the node prefix (doc/device-tree-bindings/regulator/regulator.txt). |
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Required properties: |
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- compatible: "regulator-fixed" |
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- regulator-name: this is required by the regulator uclass |
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Optional properties: |
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- gpio: GPIO to use for enable control |
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- regulator constraints (binding info: regulator.txt) |
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Other kernel-style properties, are currently not used. |
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Note: |
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For the regulator constraints, driver expects that: |
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- regulator-min-microvolt is equal to regulator-max-microvolt |
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- regulator-min-microamp is equal to regulator-max-microamp |
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Example: |
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fixed_regulator@0 { |
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/* Mandatory */ |
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compatible = "regulator-fixed"; |
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regulator-name = "LED_3.3V"; |
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/* Optional: */ |
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gpio = <&gpc1 0 GPIO_ACTIVE_LOW>; |
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/* Optional for regulator uclass */ |
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regulator-min-microvolt = <3300000>; |
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regulator-max-microvolt = <3300000>; |
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regulator-min-microamp = <15000>; |
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regulator-max-microamp = <15000>; |
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regulator-always-on; |
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regulator-boot-on; |
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}; |
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/*
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* Copyright (C) 2015 Samsung Electronics |
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* |
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* Przemyslaw Marczak <p.marczak@samsung.com> |
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* |
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* SPDX-License-Identifier: GPL-2.0+ |
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*/ |
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#include <common.h> |
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#include <fdtdec.h> |
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#include <errno.h> |
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#include <dm.h> |
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#include <i2c.h> |
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#include <asm/gpio.h> |
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#include <power/pmic.h> |
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#include <power/regulator.h> |
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DECLARE_GLOBAL_DATA_PTR; |
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struct fixed_regulator_platdata { |
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struct gpio_desc gpio; /* GPIO for regulator enable control */ |
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}; |
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static int fixed_regulator_ofdata_to_platdata(struct udevice *dev) |
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{ |
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struct dm_regulator_uclass_platdata *uc_pdata; |
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struct fixed_regulator_platdata *dev_pdata; |
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struct gpio_desc *gpio; |
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int ret; |
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dev_pdata = dev_get_platdata(dev); |
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uc_pdata = dev_get_uclass_platdata(dev); |
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if (!uc_pdata) |
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return -ENXIO; |
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/* Set type to fixed */ |
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uc_pdata->type = REGULATOR_TYPE_FIXED; |
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/* Get fixed regulator gpio desc */ |
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gpio = &dev_pdata->gpio; |
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ret = gpio_request_by_name(dev, "gpio", 0, gpio, GPIOD_IS_OUT); |
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if (ret) |
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debug("Fixed regulator gpio - not found! Error: %d", ret); |
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return 0; |
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} |
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static int fixed_regulator_get_value(struct udevice *dev) |
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{ |
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struct dm_regulator_uclass_platdata *uc_pdata; |
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uc_pdata = dev_get_uclass_platdata(dev); |
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if (!uc_pdata) |
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return -ENXIO; |
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if (uc_pdata->min_uV != uc_pdata->max_uV) { |
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debug("Invalid constraints for: %s\n", uc_pdata->name); |
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return -EINVAL; |
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} |
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return uc_pdata->min_uV; |
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} |
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static int fixed_regulator_get_current(struct udevice *dev) |
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{ |
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struct dm_regulator_uclass_platdata *uc_pdata; |
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uc_pdata = dev_get_uclass_platdata(dev); |
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if (!uc_pdata) |
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return -ENXIO; |
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if (uc_pdata->min_uA != uc_pdata->max_uA) { |
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debug("Invalid constraints for: %s\n", uc_pdata->name); |
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return -EINVAL; |
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} |
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return uc_pdata->min_uA; |
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} |
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static bool fixed_regulator_get_enable(struct udevice *dev) |
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{ |
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struct fixed_regulator_platdata *dev_pdata = dev_get_platdata(dev); |
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if (!dev_pdata->gpio.dev) |
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return false; |
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return dm_gpio_get_value(&dev_pdata->gpio); |
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} |
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static int fixed_regulator_set_enable(struct udevice *dev, bool enable) |
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{ |
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struct fixed_regulator_platdata *dev_pdata = dev_get_platdata(dev); |
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int ret; |
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if (!dev_pdata->gpio.dev) |
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return -ENOSYS; |
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ret = dm_gpio_set_value(&dev_pdata->gpio, enable); |
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if (ret) { |
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error("Can't set regulator : %s gpio to: %d\n", dev->name, |
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enable); |
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return ret; |
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} |
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return 0; |
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} |
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static const struct dm_regulator_ops fixed_regulator_ops = { |
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.get_value = fixed_regulator_get_value, |
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.get_current = fixed_regulator_get_current, |
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.get_enable = fixed_regulator_get_enable, |
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.set_enable = fixed_regulator_set_enable, |
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}; |
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static const struct udevice_id fixed_regulator_ids[] = { |
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{ .compatible = "regulator-fixed" }, |
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{ }, |
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}; |
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U_BOOT_DRIVER(fixed_regulator) = { |
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.name = "fixed regulator", |
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.id = UCLASS_REGULATOR, |
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.ops = &fixed_regulator_ops, |
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.of_match = fixed_regulator_ids, |
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.ofdata_to_platdata = fixed_regulator_ofdata_to_platdata, |
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.platdata_auto_alloc_size = sizeof(struct fixed_regulator_platdata), |
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}; |
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