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https://github.com/brain-hackers/u-boot-brain
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477dfe2ffc
Add support for gpio regulators. As of now this driver caters to gpio regulators with one gpio. Supports setting voltage values to gpio regulators and retrieving the values. Signed-off-by: Keerthy <j-keerthy@ti.com> Reviewed-by: Simon Glass <sjg@chromium.org>
138 lines
3.2 KiB
C
138 lines
3.2 KiB
C
/*
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* (C) Copyright 2016 Texas Instruments Incorporated, <www.ti.com>
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* Keerthy <j-keerthy@ti.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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#define GPIO_REGULATOR_MAX_STATES 2
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DECLARE_GLOBAL_DATA_PTR;
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struct gpio_regulator_platdata {
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struct gpio_desc gpio; /* GPIO for regulator voltage control */
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int states[GPIO_REGULATOR_MAX_STATES];
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int voltages[GPIO_REGULATOR_MAX_STATES];
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};
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static int gpio_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 gpio_regulator_platdata *dev_pdata;
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struct gpio_desc *gpio;
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const void *blob = gd->fdt_blob;
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int node = dev->of_offset;
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int ret, count, i, j;
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u32 states_array[8];
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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 gpio */
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uc_pdata->type = REGULATOR_TYPE_GPIO;
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/*
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* Get gpio regulator gpio desc
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* Assuming one GPIO per regulator.
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* Can be extended later to multiple GPIOs
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* per gpio-regulator. As of now no instance with multiple
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* gpios is presnt
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*/
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gpio = &dev_pdata->gpio;
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ret = gpio_request_by_name(dev, "gpios", 0, gpio, GPIOD_IS_OUT);
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if (ret)
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debug("regulator gpio - not found! Error: %d", ret);
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count = fdtdec_get_int_array_count(blob, node, "states",
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states_array, 8);
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if (!count)
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return -EINVAL;
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for (i = 0, j = 0; i < count; i += 2) {
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dev_pdata->voltages[j] = states_array[i];
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dev_pdata->states[j] = states_array[i + 1];
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j++;
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}
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return 0;
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}
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static int gpio_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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struct gpio_regulator_platdata *dev_pdata = dev_get_platdata(dev);
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int enable;
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if (!dev_pdata->gpio.dev)
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return -ENOSYS;
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uc_pdata = dev_get_uclass_platdata(dev);
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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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enable = dm_gpio_get_value(&dev_pdata->gpio);
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if (enable == dev_pdata->states[0])
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return dev_pdata->voltages[0];
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else
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return dev_pdata->voltages[1];
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}
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static int gpio_regulator_set_value(struct udevice *dev, int uV)
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{
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struct gpio_regulator_platdata *dev_pdata = dev_get_platdata(dev);
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int ret;
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bool enable;
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if (!dev_pdata->gpio.dev)
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return -ENOSYS;
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if (uV == dev_pdata->voltages[0])
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enable = dev_pdata->states[0];
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else if (uV == dev_pdata->voltages[1])
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enable = dev_pdata->states[1];
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else
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return -EINVAL;
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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 gpio_regulator_ops = {
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.get_value = gpio_regulator_get_value,
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.set_value = gpio_regulator_set_value,
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};
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static const struct udevice_id gpio_regulator_ids[] = {
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{ .compatible = "regulator-gpio" },
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{ },
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};
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U_BOOT_DRIVER(gpio_regulator) = {
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.name = "gpio regulator",
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.id = UCLASS_REGULATOR,
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.ops = &gpio_regulator_ops,
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.of_match = gpio_regulator_ids,
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.ofdata_to_platdata = gpio_regulator_ofdata_to_platdata,
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.platdata_auto_alloc_size = sizeof(struct gpio_regulator_platdata),
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};
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