diff --git a/sys/dev/iicbus/gpio/tca6416.c b/sys/dev/iicbus/gpio/tca6416.c
index 1e03e341c96c..467e20bc167c 100644
--- a/sys/dev/iicbus/gpio/tca6416.c
+++ b/sys/dev/iicbus/gpio/tca6416.c
@@ -1,523 +1,524 @@
 /*-
  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
  *
  * Copyright (c) 2020 Alstom Group.
  * Copyright (c) 2020 Semihalf.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  */
 
 /*
  * Driver for TI TCA6416 I2C GPIO expander module.
  *
  * This driver only supports basic functionality
  * (interrupt handling and polarity inversion were omitted).
  */
 
 #include <sys/cdefs.h>
 __FBSDID("$FreeBSD$");
 
 #include <sys/param.h>
 #include <sys/bus.h>
 #include <sys/gpio.h>
 #include <sys/kernel.h>
 #include <sys/module.h>
 #include <sys/proc.h>
 #include <sys/systm.h>
 #include <sys/sysctl.h>
 
 #include <machine/bus.h>
 
 #include <dev/ofw/openfirm.h>
 #include <dev/ofw/ofw_bus.h>
 #include <dev/ofw/ofw_bus_subr.h>
 
 #include <dev/iicbus/iicbus.h>
 #include <dev/iicbus/iiconf.h>
 
 #include <dev/gpio/gpiobusvar.h>
 
 #include "gpio_if.h"
 
 /* Base addresses of registers. LSB omitted. */
 #define	IN_PORT_REG		0x00
 #define	OUT_PORT_REG		0x02
 #define	POLARITY_INV_REG	0x04
 #define	CONF_REG		0x06
 
 #define	NUM_PINS	16
 #define	PINS_PER_REG	8
 #define	PIN_CAPS				\
 	(GPIO_PIN_OUTPUT | GPIO_PIN_INPUT	\
 	| GPIO_PIN_PUSHPULL | GPIO_PIN_INVIN)
 
 #ifdef DEBUG
 #define	dbg_dev_printf(dev, fmt, args...)	\
 	device_printf(dev, fmt, ##args)
 #else
 #define	dbg_dev_printf(dev, fmt, args...)
 #endif
 
 #define	TCA6416_BIT_FROM_PIN(pin)	(pin % PINS_PER_REG)
 #define	TCA6416_REG_ADDR(pin, baseaddr)	(baseaddr | (pin / PINS_PER_REG))
 
 struct tca6416_softc {
 	device_t	dev;
 	device_t	busdev;
 	struct mtx	mtx;
 	uint32_t	addr;
 };
 
 static int tca6416_read(device_t, uint8_t, uint8_t*);
 static int tca6416_write(device_t, uint8_t, uint8_t);
 static int tca6416_probe(device_t);
 static int tca6416_attach(device_t);
 static int tca6416_detach(device_t);
 static device_t tca6416_get_bus(device_t);
 static int tca6416_pin_max(device_t, int*);
 static int tca6416_pin_getcaps(device_t, uint32_t, uint32_t*);
 static int tca6416_pin_getflags(device_t, uint32_t, uint32_t*);
 static int tca6416_pin_setflags(device_t, uint32_t, uint32_t);
 static int tca6416_pin_getname(device_t, uint32_t, char*);
 static int tca6416_pin_get(device_t, uint32_t, unsigned int*);
 static int tca6416_pin_set(device_t, uint32_t, unsigned int);
 static int tca6416_pin_toggle(device_t, uint32_t);
 #ifdef DEBUG
 static void tca6416_regdump_setup(device_t dev);
 static int tca6416_regdump_sysctl(SYSCTL_HANDLER_ARGS);
 #endif
 
 static device_method_t tca6416_methods[] = {
 	DEVMETHOD(device_probe,		tca6416_probe),
 	DEVMETHOD(device_attach,	tca6416_attach),
 	DEVMETHOD(device_detach,	tca6416_detach),
 
 	/* GPIO methods */
 	DEVMETHOD(gpio_get_bus,		tca6416_get_bus),
 	DEVMETHOD(gpio_pin_max,		tca6416_pin_max),
 	DEVMETHOD(gpio_pin_getcaps,	tca6416_pin_getcaps),
 	DEVMETHOD(gpio_pin_getflags,	tca6416_pin_getflags),
 	DEVMETHOD(gpio_pin_setflags,	tca6416_pin_setflags),
 	DEVMETHOD(gpio_pin_getname,	tca6416_pin_getname),
 	DEVMETHOD(gpio_pin_get,		tca6416_pin_get),
 	DEVMETHOD(gpio_pin_set,		tca6416_pin_set),
 	DEVMETHOD(gpio_pin_toggle,	tca6416_pin_toggle),
 
 	DEVMETHOD_END
 };
 
 static driver_t tca6416_driver = {
 	"gpio",
 	tca6416_methods,
 	sizeof(struct tca6416_softc)
 };
 
 DRIVER_MODULE(tca6416, iicbus, tca6416_driver, 0, 0);
 MODULE_VERSION(tca6416, 1);
 
 static struct ofw_compat_data compat_data[] = {
 	{"ti,tca6416",	1},
+	{"ti,tca9539",	1},
 	{0,0}
 };
 
 static int
 tca6416_read(device_t dev, uint8_t reg, uint8_t *data)
 {
 	struct iic_msg msgs[2];
 	struct tca6416_softc *sc;
 	int error;
 
 	sc = device_get_softc(dev);
 	if (data == NULL)
 		return (EINVAL);
 
 	msgs[0].slave = sc->addr;
 	msgs[0].flags = IIC_M_WR | IIC_M_NOSTOP;
 	msgs[0].len = 1;
 	msgs[0].buf = &reg;
 
 	msgs[1].slave = sc->addr;
 	msgs[1].flags = IIC_M_RD;
 	msgs[1].len = 1;
 	msgs[1].buf = data;
 
 	error = iicbus_transfer_excl(dev, msgs, 2, IIC_WAIT);
 	return (iic2errno(error));
 }
 
 static int
 tca6416_write(device_t dev, uint8_t reg, uint8_t val)
 {
 	struct iic_msg msg;
 	struct tca6416_softc *sc;
 	int error;
 	uint8_t buffer[2] = {reg, val};
 
 	sc = device_get_softc(dev);
 
 	msg.slave = sc->addr;
 	msg.flags = IIC_M_WR;
 	msg.len = 2;
 	msg.buf = buffer;
 
 	error = iicbus_transfer_excl(dev, &msg, 1, IIC_WAIT);
 	return (iic2errno(error));
 }
 
 static int
 tca6416_probe(device_t dev)
 {
 
 	if (!ofw_bus_status_okay(dev))
 		return (ENXIO);
 
 	if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
 		return (ENXIO);
 
 	device_set_desc(dev, "TCA6416 I/O expander");
 	return (BUS_PROBE_DEFAULT);
 }
 
 static int
 tca6416_attach(device_t dev)
 {
 	struct tca6416_softc *sc;
 
 	sc = device_get_softc(dev);
 	sc->dev = dev;
 	sc->addr = iicbus_get_addr(dev);
 
 	mtx_init(&sc->mtx, "tca6416 gpio", "gpio", MTX_DEF);
 
 	sc->busdev = gpiobus_attach_bus(dev);
 	if (sc->busdev == NULL) {
 		device_printf(dev, "Could not create busdev child\n");
 		return (ENXIO);
 	}
 
 #ifdef DEBUG
 	tca6416_regdump_setup(dev);
 #endif
 
 	return (0);
 }
 
 static int
 tca6416_detach(device_t dev)
 {
 	struct tca6416_softc *sc;
 
 	sc = device_get_softc(dev);
 
 	if (sc->busdev != NULL)
 		gpiobus_detach_bus(sc->busdev);
 
 	mtx_destroy(&sc->mtx);
 
 	return (0);
 }
 
 static device_t
 tca6416_get_bus(device_t dev)
 {
 	struct tca6416_softc *sc;
 
 	sc = device_get_softc(dev);
 
 	return (sc->busdev);
 }
 
 static int
 tca6416_pin_max(device_t dev __unused, int *maxpin)
 {
 
 	if (maxpin == NULL)
 		return (EINVAL);
 
 	*maxpin = NUM_PINS - 1;
 	return (0);
 }
 
 static int
 tca6416_pin_getcaps(device_t dev, uint32_t pin, uint32_t *caps)
 {
 
 	if (pin >= NUM_PINS || caps == NULL)
 		return (EINVAL);
 
 	*caps = PIN_CAPS;
 	return (0);
 }
 
 static int
 tca6416_pin_getflags(device_t dev, uint32_t pin, uint32_t *pflags)
 {
 	int error;
 	uint8_t reg_addr, reg_bit, val;
 
 	if (pin >= NUM_PINS || pflags == NULL)
 		return (EINVAL);
 
 	reg_addr = TCA6416_REG_ADDR(pin, CONF_REG);
 	reg_bit = TCA6416_BIT_FROM_PIN(pin);
 
 	error = tca6416_read(dev, reg_addr, &val);
 	if (error != 0)
 		return (error);
 
 	*pflags = (val & (1 << reg_bit))
 	    ? GPIO_PIN_INPUT : GPIO_PIN_OUTPUT;
 
 	reg_addr = TCA6416_REG_ADDR(pin, POLARITY_INV_REG);
 
 	error = tca6416_read(dev, reg_addr, &val);
 	if (error != 0)
 		return (error);
 
 	if (val & (1 << reg_bit))
 		*pflags |= GPIO_PIN_INVIN;
 
 	return (0);
 }
 
 static int
 tca6416_pin_setflags(device_t dev, uint32_t pin, uint32_t flags)
 {
 	uint8_t reg_addr, inv_reg_addr, reg_bit, val, inv_val;
 	struct tca6416_softc *sc;
 	int error;
 
 	sc = device_get_softc(dev);
 
 	if (pin >= NUM_PINS)
 		return (EINVAL);
 
 	reg_addr = TCA6416_REG_ADDR(pin, CONF_REG);
 	inv_reg_addr = TCA6416_REG_ADDR(pin, POLARITY_INV_REG);
 	reg_bit = TCA6416_BIT_FROM_PIN(pin);
 
 	mtx_lock(&sc->mtx);
 
 	error = tca6416_read(dev, reg_addr, &val);
 	if (error != 0)
 		goto fail;
 	error = tca6416_read(dev, inv_reg_addr, &inv_val);
 	if (error != 0)
 		goto fail;
 
 	if (flags & GPIO_PIN_INPUT)
 		val |= (1 << reg_bit);
 	else if (flags & GPIO_PIN_OUTPUT)
 		val &= ~(1 << reg_bit);
 
 	if (flags & GPIO_PIN_INVIN)
 		inv_val |= (1 << reg_bit);
 	else
 		inv_val &= ~(1 << reg_bit);
 
 	error = tca6416_write(dev, reg_addr, val);
 	if (error != 0)
 		goto fail;
 	error = tca6416_write(dev, inv_reg_addr, val);
 
 fail:
 	mtx_unlock(&sc->mtx);
 	return (error);
 }
 
 static int
 tca6416_pin_getname(device_t dev, uint32_t pin, char *name)
 {
 
 	if (pin >= NUM_PINS || name == NULL)
 		return (EINVAL);
 
 	snprintf(name, GPIOMAXNAME, "gpio_P%d%d", pin / PINS_PER_REG,
 	    pin % PINS_PER_REG);
 
 	return (0);
 }
 
 static int
 tca6416_pin_get(device_t dev, uint32_t pin, unsigned int *pval)
 {
 	uint8_t reg_bit, reg_addr, reg_pvalue;
 	int error;
 
 	if (pin >= NUM_PINS || pval == NULL)
 		return (EINVAL);
 
 	reg_bit = TCA6416_BIT_FROM_PIN(pin);
 	reg_addr = TCA6416_REG_ADDR(pin, IN_PORT_REG);
 
 	dbg_dev_printf(dev, "Reading pin %u pvalue.", pin);
 
 	error = tca6416_read(dev, reg_addr, &reg_pvalue);
 	if (error != 0)
 		return (error);
 
 	*pval = reg_pvalue & (1 << reg_bit) ? 1 : 0;
 
 	return (0);
 }
 
 static int
 tca6416_pin_set(device_t dev, uint32_t pin, unsigned int val)
 {
 	struct tca6416_softc *sc;
 	uint8_t reg_addr, reg_bit, reg_value;
 	int error;
 
 	sc = device_get_softc(dev);
 
 	if (pin >= NUM_PINS)
 		return (EINVAL);
 
 	reg_addr = TCA6416_REG_ADDR(pin , OUT_PORT_REG);
 	reg_bit = TCA6416_BIT_FROM_PIN(pin);
 
 	dbg_dev_printf(dev, "Setting pin: %u to %u\n", pin, val);
 
 	mtx_lock(&sc->mtx);
 
 	error = tca6416_read(dev, reg_addr, &reg_value);
 	if (error != 0) {
 		dbg_dev_printf(dev, "Failed to read from register.\n");
 		mtx_unlock(&sc->mtx);
 		return (error);
 	}
 
 	if (val != 0)
 		reg_value |= (1 << reg_bit);
 	else
 		reg_value &= ~(1 << reg_bit);
 
 
 	error = tca6416_write(dev, reg_addr, reg_value);
 	if (error != 0) {
 		dbg_dev_printf(dev, "Could not write to register.\n");
 		mtx_unlock(&sc->mtx);
 		return (error);
 	}
 
 	mtx_unlock(&sc->mtx);
 
 	return (0);
 }
 
 static int
 tca6416_pin_toggle(device_t dev, uint32_t pin)
 {
 	struct tca6416_softc *sc;
 	int error;
 	uint8_t reg_addr, reg_bit, reg_value;
 
 	sc = device_get_softc(dev);
 
 	if (pin >= NUM_PINS)
 		return (EINVAL);
 
 	reg_addr = TCA6416_REG_ADDR(pin, OUT_PORT_REG);
 	reg_bit = TCA6416_BIT_FROM_PIN(pin);
 
 	dbg_dev_printf(dev, "Toggling pin: %d\n", pin);
 
 	mtx_lock(&sc->mtx);
 
 	error = tca6416_read(dev, reg_addr, &reg_value);
 	if (error != 0) {
 		mtx_unlock(&sc->mtx);
 		dbg_dev_printf(dev, "Cannot read from register.\n");
 		return (error);
 	}
 
 	reg_value ^= (1 << reg_bit);
 
 	error = tca6416_write(dev, reg_addr, reg_value);
 	if (error != 0)
 		dbg_dev_printf(dev, "Cannot write to register.\n");
 
 	mtx_unlock(&sc->mtx);
 
 	return (error);
 }
 
 #ifdef DEBUG
 static void
 tca6416_regdump_setup(device_t dev)
 {
 	struct sysctl_ctx_list *ctx;
 	struct sysctl_oid *node;
 
 	ctx = device_get_sysctl_ctx(dev);
 	node = device_get_sysctl_tree(dev);
 
 	SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(node), OID_AUTO, "in_reg_1",
 	    CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, dev, IN_PORT_REG,
 	    tca6416_regdump_sysctl, "A", "Input port 1");
 	SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(node), OID_AUTO, "in_reg_2",
 	    CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, dev,
 	    IN_PORT_REG | 1, tca6416_regdump_sysctl, "A", "Input port 2");
 	SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(node), OID_AUTO, "out_reg_1",
 	    CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, dev, OUT_PORT_REG,
 	    tca6416_regdump_sysctl, "A", "Output port 1");
 	SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(node), OID_AUTO, "out_reg_2",
 	    CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, dev, OUT_PORT_REG
 	    | 1, tca6416_regdump_sysctl, "A", "Output port 2");
 	SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(node), OID_AUTO, "pol_inv_1",
 	    CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, dev,
 	    POLARITY_INV_REG, tca6416_regdump_sysctl, "A", "Polarity inv 1");
 	SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(node), OID_AUTO, "pol_inv_2",
 	    CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, dev,
 	    POLARITY_INV_REG | 1, tca6416_regdump_sysctl, "A",
 	    "Polarity inv 2");
 	SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(node), OID_AUTO, "conf_reg_1",
 	    CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, dev,
 	    CONF_REG, tca6416_regdump_sysctl, "A", "Configuration 1");
 	SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(node), OID_AUTO, "conf_reg_2",
 	    CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, dev,
 	    CONF_REG | 1, tca6416_regdump_sysctl, "A", "Configuration 2");
 }
 
 static int
 tca6416_regdump_sysctl(SYSCTL_HANDLER_ARGS)
 {
 	device_t dev;
 	char buf[5];
 	int len, error;
 	uint8_t reg, regval;
 
 	dev = (device_t)arg1;
 	reg = (uint8_t)arg2;
 
 	error = tca6416_read(dev, reg, &regval);
 	if (error != 0) {
 		return (error);
 	}
 
 	len = snprintf(buf, 5, "0x%02x", regval);
 
 	error = sysctl_handle_string(oidp, buf, len, req);
 
 	return (error);
 }
 #endif