https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: fec50db7033ea478773b159e0e2efb135270e3b7 authored by Linus Torvalds on 07 April 2024, 20:22:46 UTC
Linux 6.9-rc3
Linux 6.9-rc3
Tip revision: fec50db
gpio-ts4800.c
// SPDX-License-Identifier: GPL-2.0-only
/*
* GPIO driver for the TS-4800 board
*
* Copyright (c) 2016 - Savoir-faire Linux
*/
#include <linux/gpio/driver.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#define DEFAULT_PIN_NUMBER 16
#define INPUT_REG_OFFSET 0x00
#define OUTPUT_REG_OFFSET 0x02
#define DIRECTION_REG_OFFSET 0x04
static int ts4800_gpio_probe(struct platform_device *pdev)
{
struct device_node *node;
struct gpio_chip *chip;
void __iomem *base_addr;
int retval;
u32 ngpios;
chip = devm_kzalloc(&pdev->dev, sizeof(struct gpio_chip), GFP_KERNEL);
if (!chip)
return -ENOMEM;
base_addr = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(base_addr))
return PTR_ERR(base_addr);
node = pdev->dev.of_node;
if (!node)
return -EINVAL;
retval = of_property_read_u32(node, "ngpios", &ngpios);
if (retval == -EINVAL)
ngpios = DEFAULT_PIN_NUMBER;
else if (retval)
return retval;
retval = bgpio_init(chip, &pdev->dev, 2, base_addr + INPUT_REG_OFFSET,
base_addr + OUTPUT_REG_OFFSET, NULL,
base_addr + DIRECTION_REG_OFFSET, NULL, 0);
if (retval) {
dev_err(&pdev->dev, "bgpio_init failed\n");
return retval;
}
chip->ngpio = ngpios;
platform_set_drvdata(pdev, chip);
return devm_gpiochip_add_data(&pdev->dev, chip, NULL);
}
static const struct of_device_id ts4800_gpio_of_match[] = {
{ .compatible = "technologic,ts4800-gpio", },
{},
};
MODULE_DEVICE_TABLE(of, ts4800_gpio_of_match);
static struct platform_driver ts4800_gpio_driver = {
.driver = {
.name = "ts4800-gpio",
.of_match_table = ts4800_gpio_of_match,
},
.probe = ts4800_gpio_probe,
};
module_platform_driver_probe(ts4800_gpio_driver, ts4800_gpio_probe);
MODULE_AUTHOR("Julien Grossholtz <julien.grossholtz@savoirfairelinux.com>");
MODULE_DESCRIPTION("TS4800 FPGA GPIO driver");
MODULE_LICENSE("GPL v2");