drivers/gpio/gpio-zynqmp-modepin.c

1 // SPDX-License-Identifier: GPL-2.0
3  * Driver for the ps-mode pin configuration.
10 #include <linux/gpio/driver.h>
16 #include <linux/firmware/xlnx-zynqmp.h>
18 /* 4-bit boot mode pins */
22  * modepin_gpio_get_value - Get the state of the specified pin of GPIO device
24  * @pin:	gpio pin number within the device
26  * This function reads the state of the specified pin of the GPIO device.
28  * Return: 0 if the pin is low, 1 if pin is high, -EINVAL wrong pin configured
50  * modepin_gpio_set_value - Modify the state of the pin with specified value
52  * @pin:	gpio pin number within the device
55  * This function reads the state of the specified pin of the GPIO device, mask
56  * with the capture state of GPIO pin, and update pin of GPIO device.
79 		pr_err("modepin: set value error %d for pin %d\n", ret, pin);  in modepin_gpio_set_value()
83  * modepin_gpio_dir_in - Set the direction of the specified GPIO pin as input
85  * @pin:	gpio pin number within the device
95  * modepin_gpio_dir_out - Set the direction of the specified GPIO pin as output
97  * @pin:	gpio pin number within the device
109  * modepin_gpio_probe - Initialization method for modepin_gpio
119 	chip = devm_kzalloc(&pdev->dev, sizeof(*chip), GFP_KERNEL);  in modepin_gpio_probe()
121 		return -ENOMEM;  in modepin_gpio_probe()
125 	/* configure the gpio chip */  in modepin_gpio_probe()
126 	chip->base = -1;  in modepin_gpio_probe()
127 	chip->ngpio = MODE_PINS;  in modepin_gpio_probe()
128 	chip->owner = THIS_MODULE;  in modepin_gpio_probe()
129 	chip->parent = &pdev->dev;  in modepin_gpio_probe()
130 	chip->get = modepin_gpio_get_value;  in modepin_gpio_probe()
131 	chip->set = modepin_gpio_set_value;  in modepin_gpio_probe()
132 	chip->direction_input = modepin_gpio_dir_in;  in modepin_gpio_probe()
133 	chip->direction_output = modepin_gpio_dir_out;  in modepin_gpio_probe()
134 	chip->label = dev_name(&pdev->dev);  in modepin_gpio_probe()
136 	/* modepin gpio registration */  in modepin_gpio_probe()
137 	status = devm_gpiochip_add_data(&pdev->dev, chip, chip);  in modepin_gpio_probe()
139 		return dev_err_probe(&pdev->dev, status,  in modepin_gpio_probe()
140 			      "Failed to add GPIO chip\n");  in modepin_gpio_probe()
146 	{ .compatible = "xlnx,zynqmp-gpio-modepin", },
153 		.name = "modepin-gpio",
162 MODULE_DESCRIPTION("ZynqMP Boot PS_MODE Configuration");