mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
126 lines
3.3 KiB
126 lines
3.3 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
|
/* |
|
* TI TPS380x Supply Voltage Supervisor and Reset Controller Driver |
|
* |
|
* Copyright (C) 2022 Pengutronix, Marco Felsch <[email protected]> |
|
* |
|
* Based on Simple Reset Controller Driver |
|
* |
|
* Copyright (C) 2017 Pengutronix, Philipp Zabel <[email protected]> |
|
*/ |
|
|
|
#include <linux/delay.h> |
|
#include <linux/gpio/consumer.h> |
|
#include <linux/module.h> |
|
#include <linux/of.h> |
|
#include <linux/platform_device.h> |
|
#include <linux/property.h> |
|
#include <linux/reset-controller.h> |
|
|
|
struct tps380x_reset { |
|
struct reset_controller_dev rcdev; |
|
struct gpio_desc *reset_gpio; |
|
unsigned int reset_ms; |
|
}; |
|
|
|
struct tps380x_reset_devdata { |
|
unsigned int min_reset_ms; |
|
unsigned int typ_reset_ms; |
|
unsigned int max_reset_ms; |
|
}; |
|
|
|
static inline |
|
struct tps380x_reset *to_tps380x_reset(struct reset_controller_dev *rcdev) |
|
{ |
|
return container_of(rcdev, struct tps380x_reset, rcdev); |
|
} |
|
|
|
static int |
|
tps380x_reset_assert(struct reset_controller_dev *rcdev, unsigned long id) |
|
{ |
|
struct tps380x_reset *tps380x = to_tps380x_reset(rcdev); |
|
|
|
gpiod_set_value_cansleep(tps380x->reset_gpio, 1); |
|
|
|
return 0; |
|
} |
|
|
|
static int |
|
tps380x_reset_deassert(struct reset_controller_dev *rcdev, unsigned long id) |
|
{ |
|
struct tps380x_reset *tps380x = to_tps380x_reset(rcdev); |
|
|
|
gpiod_set_value_cansleep(tps380x->reset_gpio, 0); |
|
msleep(tps380x->reset_ms); |
|
|
|
return 0; |
|
} |
|
|
|
static const struct reset_control_ops reset_tps380x_ops = { |
|
.assert = tps380x_reset_assert, |
|
.deassert = tps380x_reset_deassert, |
|
}; |
|
|
|
static int tps380x_reset_of_xlate(struct reset_controller_dev *rcdev, |
|
const struct of_phandle_args *reset_spec) |
|
{ |
|
/* No special handling needed, we have only one reset line per device */ |
|
return 0; |
|
} |
|
|
|
static int tps380x_reset_probe(struct platform_device *pdev) |
|
{ |
|
struct device *dev = &pdev->dev; |
|
const struct tps380x_reset_devdata *devdata; |
|
struct tps380x_reset *tps380x; |
|
|
|
devdata = device_get_match_data(dev); |
|
if (!devdata) |
|
return -EINVAL; |
|
|
|
tps380x = devm_kzalloc(dev, sizeof(*tps380x), GFP_KERNEL); |
|
if (!tps380x) |
|
return -ENOMEM; |
|
|
|
tps380x->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH); |
|
if (IS_ERR(tps380x->reset_gpio)) |
|
return dev_err_probe(dev, PTR_ERR(tps380x->reset_gpio), |
|
"Failed to get GPIO\n"); |
|
|
|
tps380x->reset_ms = devdata->max_reset_ms; |
|
|
|
tps380x->rcdev.ops = &reset_tps380x_ops; |
|
tps380x->rcdev.owner = THIS_MODULE; |
|
tps380x->rcdev.dev = dev; |
|
tps380x->rcdev.of_node = dev->of_node; |
|
tps380x->rcdev.of_reset_n_cells = 0; |
|
tps380x->rcdev.of_xlate = tps380x_reset_of_xlate; |
|
tps380x->rcdev.nr_resets = 1; |
|
|
|
return devm_reset_controller_register(dev, &tps380x->rcdev); |
|
} |
|
|
|
static const struct tps380x_reset_devdata tps3801_reset_data = { |
|
.min_reset_ms = 120, |
|
.typ_reset_ms = 200, |
|
.max_reset_ms = 280, |
|
}; |
|
|
|
static const struct of_device_id tps380x_reset_dt_ids[] = { |
|
{ .compatible = "ti,tps3801", .data = &tps3801_reset_data }, |
|
{ /* sentinel */ }, |
|
}; |
|
MODULE_DEVICE_TABLE(of, tps380x_reset_dt_ids); |
|
|
|
static struct platform_driver tps380x_reset_driver = { |
|
.probe = tps380x_reset_probe, |
|
.driver = { |
|
.name = "tps380x-reset", |
|
.of_match_table = tps380x_reset_dt_ids, |
|
}, |
|
}; |
|
module_platform_driver(tps380x_reset_driver); |
|
|
|
MODULE_AUTHOR("Marco Felsch <[email protected]>"); |
|
MODULE_DESCRIPTION("TI TPS380x Supply Voltage Supervisor and Reset Driver"); |
|
MODULE_LICENSE("GPL v2");
|
|
|