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;
33 u32 addr; /* I2C mux address */
34 u32 width; /* I2C mux width - number of busses */
35 struct gpio_desc gpio_mux_reset;
38 static const struct chip_desc chips[] = {
41 .muxtype = pca954x_ismux,
45 .muxtype = pca954x_ismux,
49 .muxtype = pca954x_isswi,
53 static int pca954x_deselect(struct udevice *mux, struct udevice *bus,
56 struct pca954x_priv *priv = dev_get_priv(mux);
59 return dm_i2c_write(mux, priv->addr, &byte, 1);
62 static int pca954x_select(struct udevice *mux, struct udevice *bus,
65 struct pca954x_priv *priv = dev_get_priv(mux);
66 const struct chip_desc *chip = &chips[dev_get_driver_data(mux)];
69 if (chip->muxtype == pca954x_ismux)
70 byte = channel | chip->enable;
74 return dm_i2c_write(mux, priv->addr, &byte, 1);
77 static const struct i2c_mux_ops pca954x_ops = {
78 .select = pca954x_select,
79 .deselect = pca954x_deselect,
82 static const struct udevice_id pca954x_ids[] = {
83 { .compatible = "nxp,pca9544", .data = PCA9544 },
84 { .compatible = "nxp,pca9547", .data = PCA9547 },
85 { .compatible = "nxp,pca9548", .data = PCA9548 },
89 static int pca954x_ofdata_to_platdata(struct udevice *dev)
91 struct pca954x_priv *priv = dev_get_priv(dev);
93 priv->addr = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev), "reg", 0);
95 debug("MUX not found\n");
98 priv->width = dev_get_driver_data(dev);
101 debug("No I2C MUX width specified\n");
105 debug("Device %s at 0x%x with width %d\n",
106 dev->name, priv->addr, priv->width);
111 static int pca954x_probe(struct udevice *dev)
113 if (IS_ENABLED(CONFIG_DM_GPIO)) {
114 struct pca954x_priv *priv = dev_get_priv(dev);
117 err = gpio_request_by_name(dev, "reset-gpios", 0,
118 &priv->gpio_mux_reset, GPIOD_IS_OUT);
120 /* it's optional so only bail if we get a real error */
121 if (err && (err != -ENOENT))
124 /* dm will take care of polarity */
125 if (dm_gpio_is_valid(&priv->gpio_mux_reset))
126 dm_gpio_set_value(&priv->gpio_mux_reset, 0);
132 static int pca954x_remove(struct udevice *dev)
134 if (IS_ENABLED(CONFIG_DM_GPIO)) {
135 struct pca954x_priv *priv = dev_get_priv(dev);
137 if (dm_gpio_is_valid(&priv->gpio_mux_reset))
138 dm_gpio_free(dev, &priv->gpio_mux_reset);
144 U_BOOT_DRIVER(pca954x) = {
146 .id = UCLASS_I2C_MUX,
147 .of_match = pca954x_ids,
148 .probe = pca954x_probe,
149 .remove = pca954x_remove,
151 .ofdata_to_platdata = pca954x_ofdata_to_platdata,
152 .priv_auto_alloc_size = sizeof(struct pca954x_priv),