1 // SPDX-License-Identifier: GPL-2.0+
3  * NOP USB transceiver for all USB transceiver which are either built-in
10  *	This provides a "nop" transceiver for PHYs which are
16 #include <linux/dma-mapping.h>
27 #include "phy-generic.h"
48 	struct usb_phy_generic *nop = dev_get_drvdata(x->dev);  in nop_set_suspend()
50 	if (!IS_ERR(nop->clk)) {  in nop_set_suspend()
52 			clk_disable_unprepare(nop->clk);  in nop_set_suspend()
54 			clk_prepare_enable(nop->clk);  in nop_set_suspend()
62 	if (!nop->gpiod_reset)  in nop_reset()
65 	gpiod_set_value_cansleep(nop->gpiod_reset, 1);  in nop_reset()
67 	gpiod_set_value_cansleep(nop->gpiod_reset, 0);  in nop_reset()
73 	struct regulator *vbus_draw = nop->vbus_draw;  in nop_set_vbus_draw()
80 	enabled = nop->vbus_draw_enabled;  in nop_set_vbus_draw()
87 			nop->vbus_draw_enabled = 1;  in nop_set_vbus_draw()
94 			nop->vbus_draw_enabled = 0;  in nop_set_vbus_draw()
97 	nop->mA = mA;  in nop_set_vbus_draw()
104 	struct usb_otg *otg = nop->phy.otg;  in nop_gpio_vbus_thread()
107 	vbus = gpiod_get_value(nop->gpiod_vbus);  in nop_gpio_vbus_thread()
108 	if ((vbus ^ nop->vbus) == 0)  in nop_gpio_vbus_thread()
110 	nop->vbus = vbus;  in nop_gpio_vbus_thread()
114 		otg->state = OTG_STATE_B_PERIPHERAL;  in nop_gpio_vbus_thread()
115 		nop->phy.last_event = status;  in nop_gpio_vbus_thread()
120 		atomic_notifier_call_chain(&nop->phy.notifier, status,  in nop_gpio_vbus_thread()
121 					   otg->gadget);  in nop_gpio_vbus_thread()
126 		otg->state = OTG_STATE_B_IDLE;  in nop_gpio_vbus_thread()
127 		nop->phy.last_event = status;  in nop_gpio_vbus_thread()
129 		atomic_notifier_call_chain(&nop->phy.notifier, status,  in nop_gpio_vbus_thread()
130 					   otg->gadget);  in nop_gpio_vbus_thread()
137 	struct usb_phy_generic *nop = dev_get_drvdata(phy->dev);  in usb_gen_phy_init()
140 	if (!IS_ERR(nop->vcc)) {  in usb_gen_phy_init()
141 		if (regulator_enable(nop->vcc))  in usb_gen_phy_init()
142 			dev_err(phy->dev, "Failed to enable power\n");  in usb_gen_phy_init()
145 	if (!IS_ERR(nop->clk)) {  in usb_gen_phy_init()
146 		ret = clk_prepare_enable(nop->clk);  in usb_gen_phy_init()
159 	struct usb_phy_generic *nop = dev_get_drvdata(phy->dev);  in usb_gen_phy_shutdown()
161 	gpiod_set_value_cansleep(nop->gpiod_reset, 1);  in usb_gen_phy_shutdown()
163 	if (!IS_ERR(nop->clk))  in usb_gen_phy_shutdown()
164 		clk_disable_unprepare(nop->clk);  in usb_gen_phy_shutdown()
166 	if (!IS_ERR(nop->vcc)) {  in usb_gen_phy_shutdown()
167 		if (regulator_disable(nop->vcc))  in usb_gen_phy_shutdown()
168 			dev_err(phy->dev, "Failed to disable power\n");  in usb_gen_phy_shutdown()
176 		return -ENODEV;  in nop_set_peripheral()
179 		otg->gadget = NULL;  in nop_set_peripheral()
180 		return -ENODEV;  in nop_set_peripheral()
183 	otg->gadget = gadget;  in nop_set_peripheral()
184 	if (otg->state == OTG_STATE_B_PERIPHERAL)  in nop_set_peripheral()
185 		atomic_notifier_call_chain(&otg->usb_phy->notifier,  in nop_set_peripheral()
186 					   USB_EVENT_VBUS, otg->gadget);  in nop_set_peripheral()
188 		otg->state = OTG_STATE_B_IDLE;  in nop_set_peripheral()
195 		return -ENODEV;  in nop_set_host()
198 		otg->host = NULL;  in nop_set_host()
199 		return -ENODEV;  in nop_set_host()
202 	otg->host = host;  in nop_set_host()
214 	if (dev->of_node) {  in usb_phy_gen_create_phy()
215 		struct device_node *node = dev->of_node;  in usb_phy_gen_create_phy()
217 		if (of_property_read_u32(node, "clock-frequency", &clk_rate))  in usb_phy_gen_create_phy()
220 		needs_vcc = of_property_read_bool(node, "vcc-supply");  in usb_phy_gen_create_phy()
223 	nop->gpiod_reset = devm_gpiod_get_optional(dev, "reset",  in usb_phy_gen_create_phy()
225 	err = PTR_ERR_OR_ZERO(nop->gpiod_reset);  in usb_phy_gen_create_phy()
227 		nop->gpiod_vbus = devm_gpiod_get_optional(dev,  in usb_phy_gen_create_phy()
228 						 "vbus-detect",  in usb_phy_gen_create_phy()
230 		err = PTR_ERR_OR_ZERO(nop->gpiod_vbus);  in usb_phy_gen_create_phy()
233 	if (err == -EPROBE_DEFER)  in usb_phy_gen_create_phy()
234 		return -EPROBE_DEFER;  in usb_phy_gen_create_phy()
239 	if (nop->gpiod_reset)  in usb_phy_gen_create_phy()
240 		gpiod_direction_output(nop->gpiod_reset, 1);  in usb_phy_gen_create_phy()
242 	nop->phy.otg = devm_kzalloc(dev, sizeof(*nop->phy.otg),  in usb_phy_gen_create_phy()
244 	if (!nop->phy.otg)  in usb_phy_gen_create_phy()
245 		return -ENOMEM;  in usb_phy_gen_create_phy()
247 	nop->clk = devm_clk_get(dev, "main_clk");  in usb_phy_gen_create_phy()
248 	if (IS_ERR(nop->clk)) {  in usb_phy_gen_create_phy()
249 		dev_dbg(dev, "Can't get phy clock: %ld\n",  in usb_phy_gen_create_phy()
250 					PTR_ERR(nop->clk));  in usb_phy_gen_create_phy()
252 			return PTR_ERR(nop->clk);  in usb_phy_gen_create_phy()
255 	if (!IS_ERR(nop->clk) && clk_rate) {  in usb_phy_gen_create_phy()
256 		err = clk_set_rate(nop->clk, clk_rate);  in usb_phy_gen_create_phy()
263 	nop->vcc = devm_regulator_get(dev, "vcc");  in usb_phy_gen_create_phy()
264 	if (IS_ERR(nop->vcc)) {  in usb_phy_gen_create_phy()
266 					PTR_ERR(nop->vcc));  in usb_phy_gen_create_phy()
268 			return -EPROBE_DEFER;  in usb_phy_gen_create_phy()
271 	nop->vbus_draw = devm_regulator_get_exclusive(dev, "vbus");  in usb_phy_gen_create_phy()
272 	if (PTR_ERR(nop->vbus_draw) == -ENODEV)  in usb_phy_gen_create_phy()
273 		nop->vbus_draw = NULL;  in usb_phy_gen_create_phy()
274 	if (IS_ERR(nop->vbus_draw))  in usb_phy_gen_create_phy()
275 		return dev_err_probe(dev, PTR_ERR(nop->vbus_draw),  in usb_phy_gen_create_phy()
278 	nop->dev		= dev;  in usb_phy_gen_create_phy()
279 	nop->phy.dev		= nop->dev;  in usb_phy_gen_create_phy()
280 	nop->phy.label		= "nop-xceiv";  in usb_phy_gen_create_phy()
281 	nop->phy.set_suspend	= nop_set_suspend;  in usb_phy_gen_create_phy()
282 	nop->phy.type		= type;  in usb_phy_gen_create_phy()
284 	nop->phy.otg->state		= OTG_STATE_UNDEFINED;  in usb_phy_gen_create_phy()
285 	nop->phy.otg->usb_phy		= &nop->phy;  in usb_phy_gen_create_phy()
286 	nop->phy.otg->set_host		= nop_set_host;  in usb_phy_gen_create_phy()
287 	nop->phy.otg->set_peripheral	= nop_set_peripheral;  in usb_phy_gen_create_phy()
295 	struct device *dev = &pdev->dev;  in usb_phy_generic_probe()
301 		return -ENOMEM;  in usb_phy_generic_probe()
306 	if (nop->gpiod_vbus) {  in usb_phy_generic_probe()
307 		err = devm_request_threaded_irq(&pdev->dev,  in usb_phy_generic_probe()
308 						gpiod_to_irq(nop->gpiod_vbus),  in usb_phy_generic_probe()
313 			dev_err(&pdev->dev, "can't request irq %i, err: %d\n",  in usb_phy_generic_probe()
314 				gpiod_to_irq(nop->gpiod_vbus), err);  in usb_phy_generic_probe()
317 		nop->phy.otg->state = gpiod_get_value(nop->gpiod_vbus) ?  in usb_phy_generic_probe()
321 	nop->phy.init		= usb_gen_phy_init;  in usb_phy_generic_probe()
322 	nop->phy.shutdown	= usb_gen_phy_shutdown;  in usb_phy_generic_probe()
324 	err = usb_add_phy_dev(&nop->phy);  in usb_phy_generic_probe()
326 		dev_err(&pdev->dev, "can't register transceiver, err: %d\n",  in usb_phy_generic_probe()
340 	usb_remove_phy(&nop->phy);  in usb_phy_generic_remove()
346 	{ .compatible = "usb-nop-xceiv" },
375 MODULE_DESCRIPTION("NOP USB Transceiver driver");