1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause
18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
32  * hinted attachment, but there is currently no support for hinted attachment.
56 	{"i2c-mux-gpio",  true},
74 #define IDLE_NOOP	(-1) /* When asked to idle the bus, do nothing. */
84 	 * we passed to iicmux_init_softc(), no need for validation here.  The  in gpiomux_bus_select()
86 	 * except when we're asked to idle the bus.  In that case, we transcribe  in gpiomux_bus_select()
87 	 * sc->idleidx to the pins, unless that is IDLE_NOOP (leave the current  in gpiomux_bus_select()
91 		if (sc->idleidx == IDLE_NOOP)  in gpiomux_bus_select()
93 		busidx = sc->idleidx;  in gpiomux_bus_select()
96 	for (i = 0; i < sc->numpins; ++i)  in gpiomux_bus_select()
97 		gpio_pin_set_active(sc->pins[i], busidx & (1u << i));  in gpiomux_bus_select()
111 	    ofw_bus_search_compatible(dev, compat_data)->ocd_data)  in gpiomux_probe()
125 	for (i = 0; i < sc->numpins; ++i)  in gpiomux_release_pins()
126 		gpio_pin_release(sc->pins[i]);  in gpiomux_release_pins()
146 		err = gpio_pin_get_by_ofw_propidx(dev, node, "mux-gpios", i,  in gpiomux_attach()
147 		    &sc->pins[i]);  in gpiomux_attach()
152 	sc->numpins = i;  in gpiomux_attach()
153 	if (sc->numpins == 0) {  in gpiomux_attach()
154 		device_printf(dev, "cannot acquire pins listed in mux-gpios\n");  in gpiomux_attach()
159 	numchannels = 1u << sc->numpins;  in gpiomux_attach()
161 		device_printf(dev, "too many mux-gpios pins for max %d buses\n",  in gpiomux_attach()
169 	 * have to locate it via the i2c-parent property.  Explicitly tell the  in gpiomux_attach()
173 	len = OF_getencprop(node, "i2c-parent", &propval, sizeof(propval));  in gpiomux_attach()
175 		device_printf(dev, "cannot obtain i2c-parent property\n");  in gpiomux_attach()
182 		    "cannot find device referenced by i2c-parent property\n");  in gpiomux_attach()
189 	 * If there is an idle-state property, that is the value we set the pins  in gpiomux_attach()
190 	 * to when the bus is idle, otherwise idling the bus is a no-op  in gpiomux_attach()
193 	len = OF_getencprop(node, "idle-state", &propval, sizeof(propval));  in gpiomux_attach()
197 			    "idle-state property %d exceeds channel count\n",  in gpiomux_attach()
200 		sc->idleidx = (int)propval;  in gpiomux_attach()
201 		idlebits = sc->idleidx;  in gpiomux_attach()
203 		sc->idleidx = IDLE_NOOP;  in gpiomux_attach()
207 	/* Preset the mux to the idle state to get things started. */  in gpiomux_attach()
208 	for (i = 0; i < sc->numpins; ++i) {  in gpiomux_attach()
209 		gpio_pin_setflags(sc->pins[i], GPIO_PIN_OUTPUT);  in gpiomux_attach()
210 		gpio_pin_set_active(sc->pins[i], idlebits & (1u << i));  in gpiomux_attach()