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#include <linux/device.h>
#include <linux/module.h>
#include <linux/of_platform.h>
#include <linux/regmap.h>
#include <linux/gpio/regmap.h>
#define GPIO_REG_PORT 0x0
#define GPIO_REG_DIR 0x1
static int cds9k_gpio_probe(struct platform_device *pdev)
{
struct gpio_regmap_config config = {};
struct regmap *regmap;
u32 base;
int ret;
if (!pdev->dev.parent)
return -ENODEV;
ret = device_property_read_u32(&pdev->dev, "reg", &base);
if (ret)
return -EINVAL;
regmap = dev_get_regmap(pdev->dev.parent, NULL);
if (!regmap)
return -ENODEV;
config.parent = &pdev->dev;
config.regmap = regmap;
/* XXX would be nice to use these if specified in DT
config.names =
config.label =
*/
config.ngpio = 16;
config.reg_dat_base = base + GPIO_REG_PORT;
config.reg_set_base = base + GPIO_REG_PORT;
config.reg_dir_out_base = base + GPIO_REG_DIR;
return PTR_ERR_OR_ZERO(devm_gpio_regmap_register(&pdev->dev, &config));
}
static struct of_device_id cds9k_gpio_of_match[] = {
{ .compatible = "david,cds9k-gpio" },
{}
};
MODULE_DEVICE_TABLE(of, cds9k_gpio_of_match);
static struct platform_driver cds9k_gpio = {
.driver = {
.name = "cds9k-gpio",
.of_match_table = cds9k_gpio_of_match,
},
.probe = cds9k_gpio_probe
};
module_platform_driver(cds9k_gpio);
MODULE_AUTHOR("David Phillips <david@yeah.nah.nz>");
MODULE_DESCRIPTION("GPIO driver for the CDS9K board controller");
MODULE_LICENSE("GPL v2");
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