2  * Take drivers/gpio/gpio-74x164.c as reference.
4  * 74Hx164 - Generic serial-in/parallel-out 8-bits shift register GPIO driver
8  * SPDX-License-Identifier:	GPL-2.0+
19 #include <dt-bindings/gpio/gpio.h>
25  * struct gen_74x164_chip - Data for 74Hx164
27  * @oe: OE pin
34 	struct gpio_desc oe;  member
55 	ret = dm_spi_xfer(dev, priv->nregs * 8, priv->buffer, NULL,  in gen_74x164_write_conf()
66 	uint bank = priv->nregs - 1 - offset / 8;  in gen_74x164_get_value()
69 	return (priv->buffer[bank] >> pin) & 0x1;  in gen_74x164_get_value()
76 	uint bank = priv->nregs - 1 - offset / 8;  in gen_74x164_set_value()
81 		priv->buffer[bank] |= 1 << pin;  in gen_74x164_set_value()
83 		priv->buffer[bank] &= ~(1 << pin);  in gen_74x164_set_value()
94 	return -ENOSYS;  in gen_74x164_direction_input()
111 	desc->offset = args->args[0];  in gen_74x164_xlate()
112 	desc->flags = args->args[1] & GPIO_ACTIVE_LOW ? GPIOD_ACTIVE_LOW : 0;  in gen_74x164_xlate()
132 	const void *fdt = gd->fdt_blob;  in gen_74x164_probe()
135 	snprintf(name, sizeof(name), "%s_", dev->name);  in gen_74x164_probe()
138 		return -ENOMEM;  in gen_74x164_probe()
142 	 * Documentation/devicetree/bindings/gpio/gpio-74x164.txt  in gen_74x164_probe()
144 	priv->nregs = fdtdec_get_int(fdt, node, "registers-number", 1);  in gen_74x164_probe()
145 	priv->buffer = calloc(priv->nregs, sizeof(u8));  in gen_74x164_probe()
146 	if (!priv->buffer) {  in gen_74x164_probe()
147 		ret = -ENOMEM;  in gen_74x164_probe()
151 	ret = fdtdec_get_byte_array(fdt, node, "registers-default",  in gen_74x164_probe()
152 				    priv->buffer, priv->nregs);  in gen_74x164_probe()
154 		dev_dbg(dev, "No registers-default property\n");  in gen_74x164_probe()
156 	ret = gpio_request_by_name(dev, "oe-gpios", 0, &priv->oe,  in gen_74x164_probe()
159 		dev_dbg(dev, "No oe-pins property\n");  in gen_74x164_probe()
162 	uc_priv->bank_name = str;  in gen_74x164_probe()
163 	uc_priv->gpio_count = priv->nregs * 8;  in gen_74x164_probe()
169 	dev_dbg(dev, "%s is ready\n", dev->name);  in gen_74x164_probe()
174 	free(priv->buffer);  in gen_74x164_probe()