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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * CLPS711X GPIO driver4 *5 * Copyright (C) 2012,2013 Alexander Shiyan <shc_work@mail.ru>6 */7 8#include <linux/err.h>9#include <linux/module.h>10#include <linux/gpio/driver.h>11#include <linux/platform_device.h>12 13static int clps711x_gpio_probe(struct platform_device *pdev)14{15 struct device_node *np = pdev->dev.of_node;16 void __iomem *dat, *dir;17 struct gpio_chip *gc;18 int err, id;19 20 if (!np)21 return -ENODEV;22 23 id = of_alias_get_id(np, "gpio");24 if ((id < 0) || (id > 4))25 return -ENODEV;26 27 gc = devm_kzalloc(&pdev->dev, sizeof(*gc), GFP_KERNEL);28 if (!gc)29 return -ENOMEM;30 31 dat = devm_platform_ioremap_resource(pdev, 0);32 if (IS_ERR(dat))33 return PTR_ERR(dat);34 35 dir = devm_platform_ioremap_resource(pdev, 1);36 if (IS_ERR(dir))37 return PTR_ERR(dir);38 39 switch (id) {40 case 3:41 /* PORTD is inverted logic for direction register */42 err = bgpio_init(gc, &pdev->dev, 1, dat, NULL, NULL,43 NULL, dir, 0);44 break;45 default:46 err = bgpio_init(gc, &pdev->dev, 1, dat, NULL, NULL,47 dir, NULL, 0);48 break;49 }50 51 if (err)52 return err;53 54 switch (id) {55 case 4:56 /* PORTE is 3 lines only */57 gc->ngpio = 3;58 break;59 default:60 break;61 }62 63 gc->base = -1;64 gc->owner = THIS_MODULE;65 platform_set_drvdata(pdev, gc);66 67 return devm_gpiochip_add_data(&pdev->dev, gc, NULL);68}69 70static const struct of_device_id clps711x_gpio_ids[] = {71 { .compatible = "cirrus,ep7209-gpio" },72 { }73};74MODULE_DEVICE_TABLE(of, clps711x_gpio_ids);75 76static struct platform_driver clps711x_gpio_driver = {77 .driver = {78 .name = "clps711x-gpio",79 .of_match_table = clps711x_gpio_ids,80 },81 .probe = clps711x_gpio_probe,82};83module_platform_driver(clps711x_gpio_driver);84 85MODULE_LICENSE("GPL");86MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>");87MODULE_DESCRIPTION("CLPS711X GPIO driver");88MODULE_ALIAS("platform:clps711x-gpio");89