Release the bus-recovery gpio pins in detach(), so that unload then
reload of the module works without "pin already allocated" errors.
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@ -469,6 +469,10 @@ i2c_detach(device_t dev)
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if (sc->iicbus != NULL)
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device_delete_child(dev, sc->iicbus);
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/* Release bus-recover pins; gpio_pin_release() handles NULL args. */
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gpio_pin_release(sc->rb_sclpin);
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gpio_pin_release(sc->rb_sdapin);
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if (sc->res != NULL)
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bus_release_resource(dev, SYS_RES_MEMORY, 0, sc->res);
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