GK SDK 源码库: XMIPCLinuxV100R005C00SPC030 (kernel/tools/open_source excluded)

source/bootloader/u-boot-2020.01/drivers/i2c/muxes/Kconfig

@@ -0,0 +1,46 @@
+config I2C_MUX
+	bool "Support I2C multiplexers"
+	depends on DM_I2C
+	help
+	  This enables I2C buses to be multiplexed, so that you can select
+	  one of several buses using some sort of control mechanism. The
+	  bus select is handled automatically when that bus is accessed,
+	  using a suitable I2C MUX driver.
+
+config SPL_I2C_MUX
+	bool "Support I2C multiplexers on SPL"
+	depends on I2C_MUX
+	help
+	  This enables I2C buses to be multiplexed, so that you can select
+	  one of several buses using some sort of control mechanism. The
+	  bus select is handled automatically when that bus is accessed,
+	  using a suitable I2C MUX driver.
+
+config I2C_ARB_GPIO_CHALLENGE
+	bool "GPIO-based I2C arbitration"
+	depends on I2C_MUX
+	help
+	  If you say yes to this option, support will be included for an
+	  I2C multimaster arbitration scheme using GPIOs and a challenge &
+	  response mechanism where masters have to claim the bus by asserting
+	  a GPIO.
+
+config I2C_MUX_PCA954x
+	tristate "TI PCA954x I2C Mux/switches"
+	depends on I2C_MUX
+	help
+	  If you say yes here you get support for the TI PCA954x I2C mux/switch
+	  devices. It is x width I2C multiplexer which enables to partitioning
+	  I2C bus and connect multiple devices with the same address to the same
+	  I2C controller where driver handles proper routing to target i2c
+	  device. Supported chips are PCA9543, PCA9544, PCA9547, PCA9548 and
+	  PCA9646.
+
+config I2C_MUX_GPIO
+        tristate "GPIO-based I2C multiplexer"
+	depends on I2C_MUX && DM_GPIO
+	help
+	  If you say yes to this option, support will be included for
+	  a GPIO based I2C multiplexer. This driver provides access to
+	  I2C busses connected through a MUX, which is controlled
+	  through GPIO pins.

source/bootloader/u-boot-2020.01/drivers/i2c/muxes/Makefile

@@ -0,0 +1,7 @@
+# SPDX-License-Identifier: GPL-2.0+
+#
+# Copyright (c) 2015 Google, Inc
+obj-$(CONFIG_I2C_ARB_GPIO_CHALLENGE) += i2c-arb-gpio-challenge.o
+obj-$(CONFIG_$(SPL_)I2C_MUX) += i2c-mux-uclass.o
+obj-$(CONFIG_I2C_MUX_PCA954x) += pca954x.o
+obj-$(CONFIG_I2C_MUX_GPIO) += i2c-mux-gpio.o

source/bootloader/u-boot-2020.01/drivers/i2c/muxes/i2c-arb-gpio-challenge.c

@@ -0,0 +1,146 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (c) 2015 Google, Inc
+ * Written by Simon Glass <sjg@chromium.org>
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <i2c.h>
+#include <asm/gpio.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+struct i2c_arbitrator_priv {
+	struct gpio_desc ap_claim;
+	struct gpio_desc ec_claim;
+	uint slew_delay_us;
+	uint wait_retry_ms;
+	uint wait_free_ms;
+};
+
+int i2c_arbitrator_deselect(struct udevice *mux, struct udevice *bus,
+			    uint channel)
+{
+	struct i2c_arbitrator_priv *priv = dev_get_priv(mux);
+	int ret;
+
+	debug("%s: %s\n", __func__, mux->name);
+	ret = dm_gpio_set_value(&priv->ap_claim, 0);
+	udelay(priv->slew_delay_us);
+
+	return ret;
+}
+
+int i2c_arbitrator_select(struct udevice *mux, struct udevice *bus,
+			  uint channel)
+{
+	struct i2c_arbitrator_priv *priv = dev_get_priv(mux);
+	unsigned start;
+	int ret;
+
+	debug("%s: %s\n", __func__, mux->name);
+	/* Start a round of trying to claim the bus */
+	start = get_timer(0);
+	do {
+		unsigned start_retry;
+		int waiting = 0;
+
+		/* Indicate that we want to claim the bus */
+		ret = dm_gpio_set_value(&priv->ap_claim, 1);
+		if (ret)
+			goto err;
+		udelay(priv->slew_delay_us);
+
+		/* Wait for the EC to release it */
+		start_retry = get_timer(0);
+		while (get_timer(start_retry) < priv->wait_retry_ms) {
+			ret = dm_gpio_get_value(&priv->ec_claim);
+			if (ret < 0) {
+				goto err;
+			} else if (!ret) {
+				/* We got it, so return */
+				return 0;
+			}
+
+			if (!waiting)
+				waiting = 1;
+		}
+
+		/* It didn't release, so give up, wait, and try again */
+		ret = dm_gpio_set_value(&priv->ap_claim, 0);
+		if (ret)
+			goto err;
+
+		mdelay(priv->wait_retry_ms);
+	} while (get_timer(start) < priv->wait_free_ms);
+
+	/* Give up, release our claim */
+	printf("I2C: Could not claim bus, timeout %lu\n", get_timer(start));
+	ret = -ETIMEDOUT;
+	ret = 0;
+err:
+	return ret;
+}
+
+static int i2c_arbitrator_probe(struct udevice *dev)
+{
+	struct i2c_arbitrator_priv *priv = dev_get_priv(dev);
+	const void *blob = gd->fdt_blob;
+	int node = dev_of_offset(dev);
+	int ret;
+
+	debug("%s: %s\n", __func__, dev->name);
+	priv->slew_delay_us = fdtdec_get_int(blob, node, "slew-delay-us", 0);
+	priv->wait_retry_ms = fdtdec_get_int(blob, node, "wait-retry-us", 0) /
+		1000;
+	priv->wait_free_ms = fdtdec_get_int(blob, node, "wait-free-us", 0) /
+		1000;
+	ret = gpio_request_by_name(dev, "our-claim-gpio", 0, &priv->ap_claim,
+				   GPIOD_IS_OUT);
+	if (ret)
+		goto err;
+	ret = gpio_request_by_name(dev, "their-claim-gpios", 0, &priv->ec_claim,
+				   GPIOD_IS_IN);
+	if (ret)
+		goto err_ec_gpio;
+
+	return 0;
+
+err_ec_gpio:
+	dm_gpio_free(dev, &priv->ap_claim);
+err:
+	debug("%s: ret=%d\n", __func__, ret);
+	return ret;
+}
+
+static int i2c_arbitrator_remove(struct udevice *dev)
+{
+	struct i2c_arbitrator_priv *priv = dev_get_priv(dev);
+
+	dm_gpio_free(dev, &priv->ap_claim);
+	dm_gpio_free(dev, &priv->ec_claim);
+
+	return 0;
+}
+
+static const struct i2c_mux_ops i2c_arbitrator_ops = {
+	.select		= i2c_arbitrator_select,
+	.deselect	= i2c_arbitrator_deselect,
+};
+
+static const struct udevice_id i2c_arbitrator_ids[] = {
+	{ .compatible = "i2c-arb-gpio-challenge" },
+	{ }
+};
+
+U_BOOT_DRIVER(i2c_arbitrator) = {
+	.name = "i2c_arbitrator",
+	.id = UCLASS_I2C_MUX,
+	.of_match = i2c_arbitrator_ids,
+	.probe = i2c_arbitrator_probe,
+	.remove = i2c_arbitrator_remove,
+	.ops = &i2c_arbitrator_ops,
+	.priv_auto_alloc_size = sizeof(struct i2c_arbitrator_priv),
+};

source/bootloader/u-boot-2020.01/drivers/i2c/muxes/i2c-mux-gpio.c

@@ -0,0 +1,137 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * I2C multiplexer using GPIO API
+ *
+ * Copyright 2017 NXP
+ *
+ * Peng Fan <peng.fan@nxp.com>
+ */
+
+#include <asm/io.h>
+#include <asm-generic/gpio.h>
+#include <common.h>
+#include <dm.h>
+#include <dm/pinctrl.h>
+#include <fdtdec.h>
+#include <i2c.h>
+#include <linux/errno.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/**
+ * struct i2c_mux_gpio_priv - private data for i2c mux gpio
+ *
+ * @values: the reg value of each child node
+ * @n_values: num of regs
+ * @gpios: the mux-gpios array
+ * @n_gpios: num of gpios in mux-gpios
+ * @idle: the value of idle-state
+ */
+struct i2c_mux_gpio_priv {
+	u32 *values;
+	int n_values;
+	struct gpio_desc *gpios;
+	int n_gpios;
+	u32 idle;
+};
+
+
+static int i2c_mux_gpio_select(struct udevice *dev, struct udevice *bus,
+			       uint channel)
+{
+	struct i2c_mux_gpio_priv *priv = dev_get_priv(dev);
+	int i, ret;
+
+	for (i = 0; i < priv->n_gpios; i++) {
+		ret = dm_gpio_set_value(&priv->gpios[i], (channel >> i) & 1);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+static int i2c_mux_gpio_deselect(struct udevice *dev, struct udevice *bus,
+				 uint channel)
+{
+	struct i2c_mux_gpio_priv *priv = dev_get_priv(dev);
+	int i, ret;
+
+	for (i = 0; i < priv->n_gpios; i++) {
+		ret = dm_gpio_set_value(&priv->gpios[i], (priv->idle >> i) & 1);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+static int i2c_mux_gpio_probe(struct udevice *dev)
+{
+	const void *fdt = gd->fdt_blob;
+	int node = dev_of_offset(dev);
+	struct i2c_mux_gpio_priv *mux = dev_get_priv(dev);
+	struct gpio_desc *gpios;
+	u32 *values;
+	int i = 0, subnode, ret;
+
+	mux->n_values = fdtdec_get_child_count(fdt, node);
+	values = devm_kzalloc(dev, sizeof(*mux->values) * mux->n_values,
+			      GFP_KERNEL);
+	if (!values) {
+		dev_err(dev, "Cannot alloc values array");
+		return -ENOMEM;
+	}
+
+	fdt_for_each_subnode(subnode, fdt, node) {
+		*(values + i) = fdtdec_get_uint(fdt, subnode, "reg", -1);
+		i++;
+	}
+
+	mux->values = values;
+
+	mux->idle = fdtdec_get_uint(fdt, node, "idle-state", -1);
+
+	mux->n_gpios = gpio_get_list_count(dev, "mux-gpios");
+	if (mux->n_gpios < 0) {
+		dev_err(dev, "Missing mux-gpios property\n");
+		return -EINVAL;
+	}
+
+	gpios = devm_kzalloc(dev, sizeof(struct gpio_desc) * mux->n_gpios,
+			     GFP_KERNEL);
+	if (!gpios) {
+		dev_err(dev, "Cannot allocate gpios array\n");
+		return -ENOMEM;
+	}
+
+	ret = gpio_request_list_by_name(dev, "mux-gpios", gpios, mux->n_gpios,
+					GPIOD_IS_OUT | GPIOD_IS_OUT_ACTIVE);
+	if (ret <= 0) {
+		dev_err(dev, "Failed to request mux-gpios\n");
+		return ret;
+	}
+
+	mux->gpios = gpios;
+
+	return 0;
+}
+
+static const struct i2c_mux_ops i2c_mux_gpio_ops = {
+	.select = i2c_mux_gpio_select,
+	.deselect = i2c_mux_gpio_deselect,
+};
+
+static const struct udevice_id i2c_mux_gpio_ids[] = {
+	{ .compatible = "i2c-mux-gpio", },
+	{}
+};
+
+U_BOOT_DRIVER(i2c_mux_gpio) = {
+	.name = "i2c_mux_gpio",
+	.id = UCLASS_I2C_MUX,
+	.of_match = i2c_mux_gpio_ids,
+	.ops = &i2c_mux_gpio_ops,
+	.probe = i2c_mux_gpio_probe,
+	.priv_auto_alloc_size = sizeof(struct i2c_mux_gpio_priv),
+};

source/bootloader/u-boot-2020.01/drivers/i2c/muxes/i2c-mux-uclass.c

@@ -0,0 +1,224 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (c) 2015 Google, Inc
+ * Written by Simon Glass <sjg@chromium.org>
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <i2c.h>
+#include <dm/lists.h>
+#include <dm/root.h>
+
+/**
+ * struct i2c_mux: Information the uclass stores about an I2C mux
+ *
+ * @selected:	Currently selected mux, or -1 for none
+ * @i2c_bus: I2C bus to use for communcation
+ */
+struct i2c_mux {
+	int selected;
+	struct udevice *i2c_bus;
+};
+
+/**
+ * struct i2c_mux_bus: Information about each bus the mux controls
+ *
+ * @channel: Channel number used to select this bus
+ */
+struct i2c_mux_bus {
+	uint channel;
+};
+
+/* Find out the mux channel number */
+static int i2c_mux_child_post_bind(struct udevice *dev)
+{
+	struct i2c_mux_bus *plat = dev_get_parent_platdata(dev);
+	int channel;
+
+	channel = dev_read_u32_default(dev, "reg", -1);
+	if (channel < 0)
+		return -EINVAL;
+	plat->channel = channel;
+
+	return 0;
+}
+
+/* Find the I2C buses selected by this mux */
+static int i2c_mux_post_bind(struct udevice *mux)
+{
+	ofnode node;
+	int ret;
+
+	debug("%s: %s\n", __func__, mux->name);
+	/*
+	 * There is no compatible string in the sub-nodes, so we must manually
+	 * bind these
+	 */
+	dev_for_each_subnode(node, mux) {
+		struct udevice *dev;
+		const char *name;
+		const char *arrow = "->";
+		char *full_name;
+		int parent_name_len, arrow_len, mux_name_len, name_len;
+
+		name = ofnode_get_name(node);
+
+		/* Calculate lenghts of strings */
+		parent_name_len = strlen(mux->parent->name);
+		arrow_len = strlen(arrow);
+		mux_name_len = strlen(mux->name);
+		name_len = strlen(name);
+
+		full_name = calloc(1, parent_name_len + arrow_len +
+				   mux_name_len + arrow_len + name_len + 1);
+		if (!full_name)
+			return -ENOMEM;
+
+		/* Compose bus name */
+		strcat(full_name, mux->parent->name);
+		strcat(full_name, arrow);
+		strcat(full_name, mux->name);
+		strcat(full_name, arrow);
+		strcat(full_name, name);
+
+		ret = device_bind_driver_to_node(mux, "i2c_mux_bus_drv",
+						 full_name, node, &dev);
+		debug("   - bind ret=%d, %s, req_seq %d\n", ret,
+		      dev ? dev->name : NULL, dev->req_seq);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+/* Set up the mux ready for use */
+static int i2c_mux_post_probe(struct udevice *mux)
+{
+	struct i2c_mux *priv = dev_get_uclass_priv(mux);
+	int ret;
+
+	debug("%s: %s\n", __func__, mux->name);
+	priv->selected = -1;
+
+	/* if parent is of i2c uclass already, we'll take that, otherwise
+	 * look if we find an i2c-parent phandle
+	 */
+	if (UCLASS_I2C == device_get_uclass_id(mux->parent)) {
+		priv->i2c_bus = dev_get_parent(mux);
+		debug("%s: bus=%p/%s\n", __func__, priv->i2c_bus,
+		      priv->i2c_bus->name);
+		return 0;
+	}
+
+	ret = uclass_get_device_by_phandle(UCLASS_I2C, mux, "i2c-parent",
+					   &priv->i2c_bus);
+	if (ret)
+		return ret;
+	debug("%s: bus=%p/%s\n", __func__, priv->i2c_bus, priv->i2c_bus->name);
+
+	return 0;
+}
+
+int i2c_mux_select(struct udevice *dev)
+{
+	struct i2c_mux_bus *plat = dev_get_parent_platdata(dev);
+	struct udevice *mux = dev->parent;
+	struct i2c_mux_ops *ops = i2c_mux_get_ops(mux);
+
+	if (!ops->select)
+		return -ENOSYS;
+
+	return ops->select(mux, dev, plat->channel);
+}
+
+int i2c_mux_deselect(struct udevice *dev)
+{
+	struct i2c_mux_bus *plat = dev_get_parent_platdata(dev);
+	struct udevice *mux = dev->parent;
+	struct i2c_mux_ops *ops = i2c_mux_get_ops(mux);
+
+	if (!ops->deselect)
+		return -ENOSYS;
+
+	return ops->deselect(mux, dev, plat->channel);
+}
+
+static int i2c_mux_bus_set_bus_speed(struct udevice *dev, unsigned int speed)
+{
+	struct udevice *mux = dev->parent;
+	struct i2c_mux *priv = dev_get_uclass_priv(mux);
+	int ret, ret2;
+
+	ret = i2c_mux_select(dev);
+	if (ret)
+		return ret;
+	ret = dm_i2c_set_bus_speed(priv->i2c_bus, speed);
+	ret2 = i2c_mux_deselect(dev);
+
+	return ret ? ret : ret2;
+}
+
+static int i2c_mux_bus_probe(struct udevice *dev, uint chip_addr,
+			     uint chip_flags)
+{
+	struct udevice *mux = dev->parent;
+	struct i2c_mux *priv = dev_get_uclass_priv(mux);
+	struct dm_i2c_ops *ops = i2c_get_ops(priv->i2c_bus);
+	int ret, ret2;
+
+	debug("%s: %s, bus %s\n", __func__, dev->name, priv->i2c_bus->name);
+	if (!ops->probe_chip)
+		return -ENOSYS;
+	ret = i2c_mux_select(dev);
+	if (ret)
+		return ret;
+	ret = ops->probe_chip(priv->i2c_bus, chip_addr, chip_flags);
+	ret2 = i2c_mux_deselect(dev);
+
+	return ret ? ret : ret2;
+}
+
+static int i2c_mux_bus_xfer(struct udevice *dev, struct i2c_msg *msg,
+			    int nmsgs)
+{
+	struct udevice *mux = dev->parent;
+	struct i2c_mux *priv = dev_get_uclass_priv(mux);
+	struct dm_i2c_ops *ops = i2c_get_ops(priv->i2c_bus);
+	int ret, ret2;
+
+	debug("%s: %s, bus %s\n", __func__, dev->name, priv->i2c_bus->name);
+	if (!ops->xfer)
+		return -ENOSYS;
+	ret = i2c_mux_select(dev);
+	if (ret)
+		return ret;
+	ret = ops->xfer(priv->i2c_bus, msg, nmsgs);
+	ret2 = i2c_mux_deselect(dev);
+
+	return ret ? ret : ret2;
+}
+
+static const struct dm_i2c_ops i2c_mux_bus_ops = {
+	.xfer		= i2c_mux_bus_xfer,
+	.probe_chip	= i2c_mux_bus_probe,
+	.set_bus_speed	= i2c_mux_bus_set_bus_speed,
+};
+
+U_BOOT_DRIVER(i2c_mux_bus) = {
+	.name		= "i2c_mux_bus_drv",
+	.id		= UCLASS_I2C,
+	.ops	= &i2c_mux_bus_ops,
+};
+
+UCLASS_DRIVER(i2c_mux) = {
+	.id		= UCLASS_I2C_MUX,
+	.name		= "i2c_mux",
+	.post_bind	= i2c_mux_post_bind,
+	.post_probe	= i2c_mux_post_probe,
+	.per_device_auto_alloc_size = sizeof(struct i2c_mux),
+	.per_child_platdata_auto_alloc_size = sizeof(struct i2c_mux_bus),
+	.child_post_bind = i2c_mux_child_post_bind,
+};

source/bootloader/u-boot-2020.01/drivers/i2c/muxes/pca954x.c

@@ -0,0 +1,168 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2015 - 2016 Xilinx, Inc.
+ * Copyright (C) 2017 National Instruments Corp
+ * Written by Michal Simek
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <i2c.h>
+
+#include <asm-generic/gpio.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+enum pca_type {
+	PCA9543,
+	PCA9544,
+	PCA9547,
+	PCA9548,
+	PCA9646
+};
+
+struct chip_desc {
+	u8 enable; /* Enable mask in ctl register (used for muxes only) */
+	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[] = {
+	[PCA9543] = {
+		.muxtype = pca954x_isswi,
+		.width = 2,
+	},
+	[PCA9544] = {
+		.enable = 0x4,
+		.muxtype = pca954x_ismux,
+		.width = 4,
+	},
+	[PCA9547] = {
+		.enable = 0x8,
+		.muxtype = pca954x_ismux,
+		.width = 8,
+	},
+	[PCA9548] = {
+		.muxtype = pca954x_isswi,
+		.width = 8,
+	},
+	[PCA9646] = {
+		.muxtype = pca954x_isswi,
+		.width = 4,
+	},
+};
+
+static int pca954x_deselect(struct udevice *mux, struct udevice *bus,
+			    uint channel)
+{
+	struct pca954x_priv *priv = dev_get_priv(mux);
+	uchar byte = 0;
+
+	return dm_i2c_write(mux, priv->addr, &byte, 1);
+}
+
+static int pca954x_select(struct udevice *mux, struct udevice *bus,
+			  uint channel)
+{
+	struct pca954x_priv *priv = dev_get_priv(mux);
+	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 i2c_mux_ops pca954x_ops = {
+	.select = pca954x_select,
+	.deselect = pca954x_deselect,
+};
+
+static const struct udevice_id pca954x_ids[] = {
+	{ .compatible = "nxp,pca9543", .data = PCA9543 },
+	{ .compatible = "nxp,pca9544", .data = PCA9544 },
+	{ .compatible = "nxp,pca9547", .data = PCA9547 },
+	{ .compatible = "nxp,pca9548", .data = PCA9548 },
+	{ .compatible = "nxp,pca9646", .data = PCA9646 },
+	{ }
+};
+
+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 = dev_read_u32_default(dev, "reg", 0);
+	if (!priv->addr) {
+		debug("MUX not found\n");
+		return -ENODEV;
+	}
+	priv->width = chip->width;
+
+	if (!priv->width) {
+		debug("No I2C MUX width specified\n");
+		return -EINVAL;
+	}
+
+	debug("Device %s at 0x%x with width %d\n",
+	      dev->name, priv->addr, priv->width);
+
+	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),
+};