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// SPDX-License-Identifier: GPL-2.0-only
/*
* Delta TN48M CPLD GPIO driver
*
* Copyright (C) 2021 Sartura Ltd.
*
* Author: Robert Marko <robert.marko@sartura.hr>
*/
#include <linux/device.h>
#include <linux/gpio/driver.h>
#include <linux/gpio/regmap.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
enum tn48m_gpio_type {
TN48M_GP0 = 1,
TN48M_GPI,
};
struct tn48m_gpio_config {
int ngpio;
int ngpio_per_reg;
enum tn48m_gpio_type type;
};
static const struct tn48m_gpio_config tn48m_gpo_config = {
.ngpio = 4,
.ngpio_per_reg = 4,
.type = TN48M_GP0,
};
static const struct tn48m_gpio_config tn48m_gpi_config = {
.ngpio = 4,
.ngpio_per_reg = 4,
.type = TN48M_GPI,
};
static int tn48m_gpio_probe(struct platform_device *pdev)
{
const struct tn48m_gpio_config *gpio_config;
struct gpio_regmap_config config = {};
struct regmap *regmap;
u32 base;
int ret;
if (!pdev->dev.parent)
return -ENODEV;
gpio_config = device_get_match_data(&pdev->dev);
if (!gpio_config)
return -ENODEV;
ret = device_property_read_u32(&pdev->dev, "reg", &base);
if (ret)
return ret;
regmap = dev_get_regmap(pdev->dev.parent, NULL);
if (!regmap)
return -ENODEV;
config.regmap = regmap;
config.parent = &pdev->dev;
config.ngpio = gpio_config->ngpio;
config.ngpio_per_reg = gpio_config->ngpio_per_reg;
switch (gpio_config->type) {
case TN48M_GP0:
config.reg_set_base = base;
break;
case TN48M_GPI:
config.reg_dat_base = base;
break;
default:
return -EINVAL;
}
return PTR_ERR_OR_ZERO(devm_gpio_regmap_register(&pdev->dev, &config));
}
static const struct of_device_id tn48m_gpio_of_match[] = {
{ .compatible = "delta,tn48m-gpo", .data = &tn48m_gpo_config },
{ .compatible = "delta,tn48m-gpi", .data = &tn48m_gpi_config },
{ }
};
MODULE_DEVICE_TABLE(of, tn48m_gpio_of_match);
static struct platform_driver tn48m_gpio_driver = {
.driver = {
.name = "delta-tn48m-gpio",
.of_match_table = tn48m_gpio_of_match,
},
.probe = tn48m_gpio_probe,
};
module_platform_driver(tn48m_gpio_driver);
MODULE_AUTHOR("Robert Marko <robert.marko@sartura.hr>");
MODULE_DESCRIPTION("Delta TN48M CPLD GPIO driver");
MODULE_LICENSE("GPL");
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