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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Delta TN48M CPLD GPIO driver4 *5 * Copyright (C) 2021 Sartura Ltd.6 *7 * Author: Robert Marko <robert.marko@sartura.hr>8 */9 10#include <linux/device.h>11#include <linux/gpio/driver.h>12#include <linux/gpio/regmap.h>13#include <linux/mod_devicetable.h>14#include <linux/module.h>15#include <linux/platform_device.h>16#include <linux/regmap.h>17 18enum tn48m_gpio_type {19 TN48M_GP0 = 1,20 TN48M_GPI,21};22 23struct tn48m_gpio_config {24 int ngpio;25 int ngpio_per_reg;26 enum tn48m_gpio_type type;27};28 29static const struct tn48m_gpio_config tn48m_gpo_config = {30 .ngpio = 4,31 .ngpio_per_reg = 4,32 .type = TN48M_GP0,33};34 35static const struct tn48m_gpio_config tn48m_gpi_config = {36 .ngpio = 4,37 .ngpio_per_reg = 4,38 .type = TN48M_GPI,39};40 41static int tn48m_gpio_probe(struct platform_device *pdev)42{43 const struct tn48m_gpio_config *gpio_config;44 struct gpio_regmap_config config = {};45 struct regmap *regmap;46 u32 base;47 int ret;48 49 if (!pdev->dev.parent)50 return -ENODEV;51 52 gpio_config = device_get_match_data(&pdev->dev);53 if (!gpio_config)54 return -ENODEV;55 56 ret = device_property_read_u32(&pdev->dev, "reg", &base);57 if (ret)58 return ret;59 60 regmap = dev_get_regmap(pdev->dev.parent, NULL);61 if (!regmap)62 return -ENODEV;63 64 config.regmap = regmap;65 config.parent = &pdev->dev;66 config.ngpio = gpio_config->ngpio;67 config.ngpio_per_reg = gpio_config->ngpio_per_reg;68 switch (gpio_config->type) {69 case TN48M_GP0:70 config.reg_set_base = base;71 break;72 case TN48M_GPI:73 config.reg_dat_base = base;74 break;75 default:76 return -EINVAL;77 }78 79 return PTR_ERR_OR_ZERO(devm_gpio_regmap_register(&pdev->dev, &config));80}81 82static const struct of_device_id tn48m_gpio_of_match[] = {83 { .compatible = "delta,tn48m-gpo", .data = &tn48m_gpo_config },84 { .compatible = "delta,tn48m-gpi", .data = &tn48m_gpi_config },85 { }86};87MODULE_DEVICE_TABLE(of, tn48m_gpio_of_match);88 89static struct platform_driver tn48m_gpio_driver = {90 .driver = {91 .name = "delta-tn48m-gpio",92 .of_match_table = tn48m_gpio_of_match,93 },94 .probe = tn48m_gpio_probe,95};96module_platform_driver(tn48m_gpio_driver);97 98MODULE_AUTHOR("Robert Marko <robert.marko@sartura.hr>");99MODULE_DESCRIPTION("Delta TN48M CPLD GPIO driver");100MODULE_LICENSE("GPL");101