/*
* Copyright (C) 2015 - 2016 Xilinx, Inc.
+ * Copyright (C) 2017 National Instruments Corp
* Written by Michal Simek
*
* SPDX-License-Identifier: GPL-2.0+
#include <dm.h>
#include <errno.h>
#include <i2c.h>
-#include <asm/gpio.h>
+
+#include <asm-generic/gpio.h>
DECLARE_GLOBAL_DATA_PTR;
+enum pca_type {
+ PCA9544,
+ PCA9547,
+ PCA9548
+};
+
+struct chip_desc {
+ u8 enable;
+ enum muxtype {
+ pca954x_ismux = 0,
+ pca954x_isswi,
+ } muxtype;
+ u32 width;
+};
+
struct pca954x_priv {
u32 addr; /* I2C mux address */
u32 width; /* I2C mux width - number of busses */
+ struct gpio_desc gpio_mux_reset;
+};
+
+static const struct chip_desc chips[] = {
+ [PCA9544] = {
+ .enable = 0x4,
+ .muxtype = pca954x_ismux,
+ .width = 4,
+ },
+ [PCA9547] = {
+ .enable = 0x8,
+ .muxtype = pca954x_ismux,
+ .width = 8,
+ },
+ [PCA9548] = {
+ .enable = 0x8,
+ .muxtype = pca954x_isswi,
+ .width = 8,
+ },
};
static int pca954x_deselect(struct udevice *mux, struct udevice *bus,
uint channel)
{
struct pca954x_priv *priv = dev_get_priv(mux);
- uchar byte = 1 << channel;
+ const struct chip_desc *chip = &chips[dev_get_driver_data(mux)];
+ uchar byte;
+
+ if (chip->muxtype == pca954x_ismux)
+ byte = channel | chip->enable;
+ else
+ byte = 1 << channel;
return dm_i2c_write(mux, priv->addr, &byte, 1);
}
};
static const struct udevice_id pca954x_ids[] = {
- { .compatible = "nxp,pca9548", .data = (ulong)8 },
- { .compatible = "nxp,pca9544", .data = (ulong)4 },
+ { .compatible = "nxp,pca9544", .data = PCA9544 },
+ { .compatible = "nxp,pca9547", .data = PCA9547 },
+ { .compatible = "nxp,pca9548", .data = PCA9548 },
{ }
};
static int pca954x_ofdata_to_platdata(struct udevice *dev)
{
struct pca954x_priv *priv = dev_get_priv(dev);
+ const struct chip_desc *chip = &chips[dev_get_driver_data(dev)];
- priv->addr = fdtdec_get_int(gd->fdt_blob, dev->of_offset, "reg", 0);
+ priv->addr = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev), "reg", 0);
if (!priv->addr) {
debug("MUX not found\n");
return -ENODEV;
}
- priv->width = dev_get_driver_data(dev);
+ priv->width = chip->width;
if (!priv->width) {
debug("No I2C MUX width specified\n");
return 0;
}
+static int pca954x_probe(struct udevice *dev)
+{
+ if (IS_ENABLED(CONFIG_DM_GPIO)) {
+ struct pca954x_priv *priv = dev_get_priv(dev);
+ int err;
+
+ err = gpio_request_by_name(dev, "reset-gpios", 0,
+ &priv->gpio_mux_reset, GPIOD_IS_OUT);
+
+ /* it's optional so only bail if we get a real error */
+ if (err && (err != -ENOENT))
+ return err;
+
+ /* dm will take care of polarity */
+ if (dm_gpio_is_valid(&priv->gpio_mux_reset))
+ dm_gpio_set_value(&priv->gpio_mux_reset, 0);
+ }
+
+ return 0;
+}
+
+static int pca954x_remove(struct udevice *dev)
+{
+ if (IS_ENABLED(CONFIG_DM_GPIO)) {
+ struct pca954x_priv *priv = dev_get_priv(dev);
+
+ if (dm_gpio_is_valid(&priv->gpio_mux_reset))
+ dm_gpio_free(dev, &priv->gpio_mux_reset);
+ }
+
+ return 0;
+}
+
U_BOOT_DRIVER(pca954x) = {
.name = "pca954x",
.id = UCLASS_I2C_MUX,
.of_match = pca954x_ids,
+ .probe = pca954x_probe,
+ .remove = pca954x_remove,
.ops = &pca954x_ops,
.ofdata_to_platdata = pca954x_ofdata_to_platdata,
.priv_auto_alloc_size = sizeof(struct pca954x_priv),