2 * Copyright (C) 2015 - 2016 Xilinx, Inc.
3 * Copyright (C) 2017 National Instruments Corp
4 * Written by Michal Simek
6 * SPDX-License-Identifier: GPL-2.0+
14 #include <asm-generic/gpio.h>
16 DECLARE_GLOBAL_DATA_PTR;
34 u32 addr; /* I2C mux address */
35 u32 width; /* I2C mux width - number of busses */
36 struct gpio_desc gpio_mux_reset;
39 static const struct chip_desc chips[] = {
42 .muxtype = pca954x_ismux,
47 .muxtype = pca954x_ismux,
52 .muxtype = pca954x_isswi,
57 static int pca954x_deselect(struct udevice *mux, struct udevice *bus,
60 struct pca954x_priv *priv = dev_get_priv(mux);
63 return dm_i2c_write(mux, priv->addr, &byte, 1);
66 static int pca954x_select(struct udevice *mux, struct udevice *bus,
69 struct pca954x_priv *priv = dev_get_priv(mux);
70 const struct chip_desc *chip = &chips[dev_get_driver_data(mux)];
73 if (chip->muxtype == pca954x_ismux)
74 byte = channel | chip->enable;
78 return dm_i2c_write(mux, priv->addr, &byte, 1);
81 static const struct i2c_mux_ops pca954x_ops = {
82 .select = pca954x_select,
83 .deselect = pca954x_deselect,
86 static const struct udevice_id pca954x_ids[] = {
87 { .compatible = "nxp,pca9544", .data = PCA9544 },
88 { .compatible = "nxp,pca9547", .data = PCA9547 },
89 { .compatible = "nxp,pca9548", .data = PCA9548 },
93 static int pca954x_ofdata_to_platdata(struct udevice *dev)
95 struct pca954x_priv *priv = dev_get_priv(dev);
96 const struct chip_desc *chip = &chips[dev_get_driver_data(dev)];
98 priv->addr = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev), "reg", 0);
100 debug("MUX not found\n");
103 priv->width = chip->width;
106 debug("No I2C MUX width specified\n");
110 debug("Device %s at 0x%x with width %d\n",
111 dev->name, priv->addr, priv->width);
116 static int pca954x_probe(struct udevice *dev)
118 if (IS_ENABLED(CONFIG_DM_GPIO)) {
119 struct pca954x_priv *priv = dev_get_priv(dev);
122 err = gpio_request_by_name(dev, "reset-gpios", 0,
123 &priv->gpio_mux_reset, GPIOD_IS_OUT);
125 /* it's optional so only bail if we get a real error */
126 if (err && (err != -ENOENT))
129 /* dm will take care of polarity */
130 if (dm_gpio_is_valid(&priv->gpio_mux_reset))
131 dm_gpio_set_value(&priv->gpio_mux_reset, 0);
137 static int pca954x_remove(struct udevice *dev)
139 if (IS_ENABLED(CONFIG_DM_GPIO)) {
140 struct pca954x_priv *priv = dev_get_priv(dev);
142 if (dm_gpio_is_valid(&priv->gpio_mux_reset))
143 dm_gpio_free(dev, &priv->gpio_mux_reset);
149 U_BOOT_DRIVER(pca954x) = {
151 .id = UCLASS_I2C_MUX,
152 .of_match = pca954x_ids,
153 .probe = pca954x_probe,
154 .remove = pca954x_remove,
156 .ofdata_to_platdata = pca954x_ofdata_to_platdata,
157 .priv_auto_alloc_size = sizeof(struct pca954x_priv),