1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Motorola Mapphone MDM6600 modem GPIO controlled USB PHY driver
4  * Copyright (C) 2018 Tony Lindgren <tony@atomide.com>
5  */
6 
7 #include <linux/delay.h>
8 #include <linux/err.h>
9 #include <linux/io.h>
10 #include <linux/interrupt.h>
11 #include <linux/module.h>
12 #include <linux/of.h>
13 #include <linux/platform_device.h>
14 #include <linux/slab.h>
15 
16 #include <linux/gpio/consumer.h>
17 #include <linux/of_platform.h>
18 #include <linux/phy/phy.h>
19 #include <linux/pinctrl/consumer.h>
20 
21 #define PHY_MDM6600_PHY_DELAY_MS	4000	/* PHY enable 2.2s to 3.5s */
22 #define PHY_MDM6600_ENABLED_DELAY_MS	8000	/* 8s more total for MDM6600 */
23 #define PHY_MDM6600_WAKE_KICK_MS	600	/* time on after GPIO toggle */
24 #define MDM6600_MODEM_IDLE_DELAY_MS	1000	/* modem after USB suspend */
25 #define MDM6600_MODEM_WAKE_DELAY_MS	200	/* modem response after idle */
26 
27 enum phy_mdm6600_ctrl_lines {
28 	PHY_MDM6600_ENABLE,			/* USB PHY enable */
29 	PHY_MDM6600_POWER,			/* Device power */
30 	PHY_MDM6600_RESET,			/* Device reset */
31 	PHY_MDM6600_NR_CTRL_LINES,
32 };
33 
34 enum phy_mdm6600_bootmode_lines {
35 	PHY_MDM6600_MODE0,			/* out USB mode0 and OOB wake */
36 	PHY_MDM6600_MODE1,			/* out USB mode1, in OOB wake */
37 	PHY_MDM6600_NR_MODE_LINES,
38 };
39 
40 enum phy_mdm6600_cmd_lines {
41 	PHY_MDM6600_CMD0,
42 	PHY_MDM6600_CMD1,
43 	PHY_MDM6600_CMD2,
44 	PHY_MDM6600_NR_CMD_LINES,
45 };
46 
47 enum phy_mdm6600_status_lines {
48 	PHY_MDM6600_STATUS0,
49 	PHY_MDM6600_STATUS1,
50 	PHY_MDM6600_STATUS2,
51 	PHY_MDM6600_NR_STATUS_LINES,
52 };
53 
54 /*
55  * MDM6600 command codes. These are based on Motorola Mapphone Linux
56  * kernel tree.
57  */
58 enum phy_mdm6600_cmd {
59 	PHY_MDM6600_CMD_BP_PANIC_ACK,
60 	PHY_MDM6600_CMD_DATA_ONLY_BYPASS,	/* Reroute USB to CPCAP PHY */
61 	PHY_MDM6600_CMD_FULL_BYPASS,		/* Reroute USB to CPCAP PHY */
62 	PHY_MDM6600_CMD_NO_BYPASS,		/* Request normal USB mode */
63 	PHY_MDM6600_CMD_BP_SHUTDOWN_REQ,	/* Request device power off */
64 	PHY_MDM6600_CMD_BP_UNKNOWN_5,
65 	PHY_MDM6600_CMD_BP_UNKNOWN_6,
66 	PHY_MDM6600_CMD_UNDEFINED,
67 };
68 
69 /*
70  * MDM6600 status codes. These are based on Motorola Mapphone Linux
71  * kernel tree.
72  */
73 enum phy_mdm6600_status {
74 	PHY_MDM6600_STATUS_PANIC,		/* Seems to be really off */
75 	PHY_MDM6600_STATUS_PANIC_BUSY_WAIT,
76 	PHY_MDM6600_STATUS_QC_DLOAD,
77 	PHY_MDM6600_STATUS_RAM_DOWNLOADER,	/* MDM6600 USB flashing mode */
78 	PHY_MDM6600_STATUS_PHONE_CODE_AWAKE,	/* MDM6600 normal USB mode */
79 	PHY_MDM6600_STATUS_PHONE_CODE_ASLEEP,
80 	PHY_MDM6600_STATUS_SHUTDOWN_ACK,
81 	PHY_MDM6600_STATUS_UNDEFINED,
82 };
83 
84 static const char * const
85 phy_mdm6600_status_name[] = {
86 	"off", "busy", "qc_dl", "ram_dl", "awake",
87 	"asleep", "shutdown", "undefined",
88 };
89 
90 struct phy_mdm6600 {
91 	struct device *dev;
92 	struct phy *generic_phy;
93 	struct phy_provider *phy_provider;
94 	struct gpio_desc *ctrl_gpios[PHY_MDM6600_NR_CTRL_LINES];
95 	struct gpio_descs *mode_gpios;
96 	struct gpio_descs *status_gpios;
97 	struct gpio_descs *cmd_gpios;
98 	struct delayed_work bootup_work;
99 	struct delayed_work status_work;
100 	struct delayed_work modem_wake_work;
101 	struct completion ack;
102 	bool enabled;				/* mdm6600 phy enabled */
103 	bool running;				/* mdm6600 boot done */
104 	bool awake;				/* mdm6600 respnds on n_gsm */
105 	int status;
106 };
107 
108 static int phy_mdm6600_init(struct phy *x)
109 {
110 	struct phy_mdm6600 *ddata = phy_get_drvdata(x);
111 	struct gpio_desc *enable_gpio = ddata->ctrl_gpios[PHY_MDM6600_ENABLE];
112 
113 	if (!ddata->enabled)
114 		return -EPROBE_DEFER;
115 
116 	gpiod_set_value_cansleep(enable_gpio, 0);
117 
118 	return 0;
119 }
120 
121 static int phy_mdm6600_power_on(struct phy *x)
122 {
123 	struct phy_mdm6600 *ddata = phy_get_drvdata(x);
124 	struct gpio_desc *enable_gpio = ddata->ctrl_gpios[PHY_MDM6600_ENABLE];
125 	int error;
126 
127 	if (!ddata->enabled)
128 		return -ENODEV;
129 
130 	error = pinctrl_pm_select_default_state(ddata->dev);
131 	if (error)
132 		dev_warn(ddata->dev, "%s: error with default_state: %i\n",
133 			 __func__, error);
134 
135 	gpiod_set_value_cansleep(enable_gpio, 1);
136 
137 	/* Allow aggressive PM for USB, it's only needed for n_gsm port */
138 	if (pm_runtime_enabled(&x->dev))
139 		phy_pm_runtime_put(x);
140 
141 	return 0;
142 }
143 
144 static int phy_mdm6600_power_off(struct phy *x)
145 {
146 	struct phy_mdm6600 *ddata = phy_get_drvdata(x);
147 	struct gpio_desc *enable_gpio = ddata->ctrl_gpios[PHY_MDM6600_ENABLE];
148 	int error;
149 
150 	if (!ddata->enabled)
151 		return -ENODEV;
152 
153 	/* Paired with phy_pm_runtime_put() in phy_mdm6600_power_on() */
154 	if (pm_runtime_enabled(&x->dev)) {
155 		error = phy_pm_runtime_get(x);
156 		if (error < 0 && error != -EINPROGRESS)
157 			dev_warn(ddata->dev, "%s: phy_pm_runtime_get: %i\n",
158 				 __func__, error);
159 	}
160 
161 	gpiod_set_value_cansleep(enable_gpio, 0);
162 
163 	error = pinctrl_pm_select_sleep_state(ddata->dev);
164 	if (error)
165 		dev_warn(ddata->dev, "%s: error with sleep_state: %i\n",
166 			 __func__, error);
167 
168 	return 0;
169 }
170 
171 static const struct phy_ops gpio_usb_ops = {
172 	.init = phy_mdm6600_init,
173 	.power_on = phy_mdm6600_power_on,
174 	.power_off = phy_mdm6600_power_off,
175 	.owner = THIS_MODULE,
176 };
177 
178 /**
179  * phy_mdm6600_cmd() - send a command request to mdm6600
180  * @ddata: device driver data
181  * @val: value of cmd to be set
182  *
183  * Configures the three command request GPIOs to the specified value.
184  */
185 static void phy_mdm6600_cmd(struct phy_mdm6600 *ddata, int val)
186 {
187 	DECLARE_BITMAP(values, PHY_MDM6600_NR_CMD_LINES);
188 
189 	values[0] = val;
190 
191 	gpiod_set_array_value_cansleep(PHY_MDM6600_NR_CMD_LINES,
192 				       ddata->cmd_gpios->desc,
193 				       ddata->cmd_gpios->info, values);
194 }
195 
196 /**
197  * phy_mdm6600_status() - read mdm6600 status lines
198  * @work: work structure
199  */
200 static void phy_mdm6600_status(struct work_struct *work)
201 {
202 	struct phy_mdm6600 *ddata;
203 	struct device *dev;
204 	DECLARE_BITMAP(values, PHY_MDM6600_NR_STATUS_LINES);
205 	int error;
206 
207 	ddata = container_of(work, struct phy_mdm6600, status_work.work);
208 	dev = ddata->dev;
209 
210 	error = gpiod_get_array_value_cansleep(PHY_MDM6600_NR_STATUS_LINES,
211 					       ddata->status_gpios->desc,
212 					       ddata->status_gpios->info,
213 					       values);
214 	if (error)
215 		return;
216 
217 	ddata->status = values[0] & ((1 << PHY_MDM6600_NR_STATUS_LINES) - 1);
218 
219 	dev_info(dev, "modem status: %i %s\n",
220 		 ddata->status,
221 		 phy_mdm6600_status_name[ddata->status]);
222 	complete(&ddata->ack);
223 }
224 
225 static irqreturn_t phy_mdm6600_irq_thread(int irq, void *data)
226 {
227 	struct phy_mdm6600 *ddata = data;
228 
229 	schedule_delayed_work(&ddata->status_work, msecs_to_jiffies(10));
230 
231 	return IRQ_HANDLED;
232 }
233 
234 /**
235  * phy_mdm6600_wakeirq_thread - handle mode1 line OOB wake after booting
236  * @irq: interrupt
237  * @data: interrupt handler data
238  *
239  * GPIO mode1 is used initially as output to configure the USB boot
240  * mode for mdm6600. After booting it is used as input for OOB wake
241  * signal from mdm6600 to the SoC. Just use it for debug info only
242  * for now.
243  */
244 static irqreturn_t phy_mdm6600_wakeirq_thread(int irq, void *data)
245 {
246 	struct phy_mdm6600 *ddata = data;
247 	struct gpio_desc *mode_gpio1;
248 	int error, wakeup;
249 
250 	mode_gpio1 = ddata->mode_gpios->desc[PHY_MDM6600_MODE1];
251 	wakeup = gpiod_get_value(mode_gpio1);
252 	if (!wakeup)
253 		return IRQ_NONE;
254 
255 	dev_dbg(ddata->dev, "OOB wake on mode_gpio1: %i\n", wakeup);
256 	error = pm_runtime_get_sync(ddata->dev);
257 	if (error < 0) {
258 		pm_runtime_put_noidle(ddata->dev);
259 
260 		return IRQ_NONE;
261 	}
262 
263 	/* Just wake-up and kick the autosuspend timer */
264 	pm_runtime_mark_last_busy(ddata->dev);
265 	pm_runtime_put_autosuspend(ddata->dev);
266 
267 	return IRQ_HANDLED;
268 }
269 
270 /**
271  * phy_mdm6600_init_irq() - initialize mdm6600 status IRQ lines
272  * @ddata: device driver data
273  */
274 static void phy_mdm6600_init_irq(struct phy_mdm6600 *ddata)
275 {
276 	struct device *dev = ddata->dev;
277 	int i, error, irq;
278 
279 	for (i = PHY_MDM6600_STATUS0;
280 	     i <= PHY_MDM6600_STATUS2; i++) {
281 		struct gpio_desc *gpio = ddata->status_gpios->desc[i];
282 
283 		irq = gpiod_to_irq(gpio);
284 		if (irq <= 0)
285 			continue;
286 
287 		error = devm_request_threaded_irq(dev, irq, NULL,
288 					phy_mdm6600_irq_thread,
289 					IRQF_TRIGGER_RISING |
290 					IRQF_TRIGGER_FALLING |
291 					IRQF_ONESHOT,
292 					"mdm6600",
293 					ddata);
294 		if (error)
295 			dev_warn(dev, "no modem status irq%i: %i\n",
296 				 irq, error);
297 	}
298 }
299 
300 struct phy_mdm6600_map {
301 	const char *name;
302 	int direction;
303 };
304 
305 static const struct phy_mdm6600_map
306 phy_mdm6600_ctrl_gpio_map[PHY_MDM6600_NR_CTRL_LINES] = {
307 	{ "enable", GPIOD_OUT_LOW, },		/* low = phy disabled */
308 	{ "power", GPIOD_OUT_LOW, },		/* low = off */
309 	{ "reset", GPIOD_OUT_HIGH, },		/* high = reset */
310 };
311 
312 /**
313  * phy_mdm6600_init_lines() - initialize mdm6600 GPIO lines
314  * @ddata: device driver data
315  */
316 static int phy_mdm6600_init_lines(struct phy_mdm6600 *ddata)
317 {
318 	struct device *dev = ddata->dev;
319 	int i;
320 
321 	/* MDM6600 control lines */
322 	for (i = 0; i < ARRAY_SIZE(phy_mdm6600_ctrl_gpio_map); i++) {
323 		const struct phy_mdm6600_map *map =
324 			&phy_mdm6600_ctrl_gpio_map[i];
325 		struct gpio_desc **gpio = &ddata->ctrl_gpios[i];
326 
327 		*gpio = devm_gpiod_get(dev, map->name, map->direction);
328 		if (IS_ERR(*gpio)) {
329 			dev_info(dev, "gpio %s error %li\n",
330 				 map->name, PTR_ERR(*gpio));
331 			return PTR_ERR(*gpio);
332 		}
333 	}
334 
335 	/* MDM6600 USB start-up mode output lines */
336 	ddata->mode_gpios = devm_gpiod_get_array(dev, "motorola,mode",
337 						 GPIOD_OUT_LOW);
338 	if (IS_ERR(ddata->mode_gpios))
339 		return PTR_ERR(ddata->mode_gpios);
340 
341 	if (ddata->mode_gpios->ndescs != PHY_MDM6600_NR_MODE_LINES)
342 		return -EINVAL;
343 
344 	/* MDM6600 status input lines */
345 	ddata->status_gpios = devm_gpiod_get_array(dev, "motorola,status",
346 						   GPIOD_IN);
347 	if (IS_ERR(ddata->status_gpios))
348 		return PTR_ERR(ddata->status_gpios);
349 
350 	if (ddata->status_gpios->ndescs != PHY_MDM6600_NR_STATUS_LINES)
351 		return -EINVAL;
352 
353 	/* MDM6600 cmd output lines */
354 	ddata->cmd_gpios = devm_gpiod_get_array(dev, "motorola,cmd",
355 						GPIOD_OUT_LOW);
356 	if (IS_ERR(ddata->cmd_gpios))
357 		return PTR_ERR(ddata->cmd_gpios);
358 
359 	if (ddata->cmd_gpios->ndescs != PHY_MDM6600_NR_CMD_LINES)
360 		return -EINVAL;
361 
362 	return 0;
363 }
364 
365 /**
366  * phy_mdm6600_device_power_on() - power on mdm6600 device
367  * @ddata: device driver data
368  *
369  * To get the integrated USB phy in MDM6600 takes some hoops. We must ensure
370  * the shared USB bootmode GPIOs are configured, then request modem start-up,
371  * reset and power-up.. And then we need to recycle the shared USB bootmode
372  * GPIOs as they are also used for Out of Band (OOB) wake for the USB and
373  * TS 27.010 serial mux.
374  */
375 static int phy_mdm6600_device_power_on(struct phy_mdm6600 *ddata)
376 {
377 	struct gpio_desc *mode_gpio0, *mode_gpio1, *reset_gpio, *power_gpio;
378 	int error = 0, wakeirq;
379 
380 	mode_gpio0 = ddata->mode_gpios->desc[PHY_MDM6600_MODE0];
381 	mode_gpio1 = ddata->mode_gpios->desc[PHY_MDM6600_MODE1];
382 	reset_gpio = ddata->ctrl_gpios[PHY_MDM6600_RESET];
383 	power_gpio = ddata->ctrl_gpios[PHY_MDM6600_POWER];
384 
385 	/*
386 	 * Shared GPIOs must be low for normal USB mode. After booting
387 	 * they are used for OOB wake signaling. These can be also used
388 	 * to configure USB flashing mode later on based on a module
389 	 * parameter.
390 	 */
391 	gpiod_set_value_cansleep(mode_gpio0, 0);
392 	gpiod_set_value_cansleep(mode_gpio1, 0);
393 
394 	/* Request start-up mode */
395 	phy_mdm6600_cmd(ddata, PHY_MDM6600_CMD_NO_BYPASS);
396 
397 	/* Request a reset first */
398 	gpiod_set_value_cansleep(reset_gpio, 0);
399 	msleep(100);
400 
401 	/* Toggle power GPIO to request mdm6600 to start */
402 	gpiod_set_value_cansleep(power_gpio, 1);
403 	msleep(100);
404 	gpiod_set_value_cansleep(power_gpio, 0);
405 
406 	/*
407 	 * Looks like the USB PHY needs between 2.2 to 4 seconds.
408 	 * If we try to use it before that, we will get L3 errors
409 	 * from omap-usb-host trying to access the PHY. See also
410 	 * phy_mdm6600_init() for -EPROBE_DEFER.
411 	 */
412 	msleep(PHY_MDM6600_PHY_DELAY_MS);
413 	ddata->enabled = true;
414 
415 	/* Booting up the rest of MDM6600 will take total about 8 seconds */
416 	dev_info(ddata->dev, "Waiting for power up request to complete..\n");
417 	if (wait_for_completion_timeout(&ddata->ack,
418 			msecs_to_jiffies(PHY_MDM6600_ENABLED_DELAY_MS))) {
419 		if (ddata->status > PHY_MDM6600_STATUS_PANIC &&
420 		    ddata->status < PHY_MDM6600_STATUS_SHUTDOWN_ACK)
421 			dev_info(ddata->dev, "Powered up OK\n");
422 	} else {
423 		ddata->enabled = false;
424 		error = -ETIMEDOUT;
425 		dev_err(ddata->dev, "Timed out powering up\n");
426 	}
427 
428 	/* Reconfigure mode1 GPIO as input for OOB wake */
429 	gpiod_direction_input(mode_gpio1);
430 
431 	wakeirq = gpiod_to_irq(mode_gpio1);
432 	if (wakeirq <= 0)
433 		return wakeirq;
434 
435 	error = devm_request_threaded_irq(ddata->dev, wakeirq, NULL,
436 					  phy_mdm6600_wakeirq_thread,
437 					  IRQF_TRIGGER_RISING |
438 					  IRQF_TRIGGER_FALLING |
439 					  IRQF_ONESHOT,
440 					  "mdm6600-wake",
441 					  ddata);
442 	if (error)
443 		dev_warn(ddata->dev, "no modem wakeirq irq%i: %i\n",
444 			 wakeirq, error);
445 
446 	ddata->running = true;
447 
448 	return error;
449 }
450 
451 /**
452  * phy_mdm6600_device_power_off() - power off mdm6600 device
453  * @ddata: device driver data
454  */
455 static void phy_mdm6600_device_power_off(struct phy_mdm6600 *ddata)
456 {
457 	struct gpio_desc *reset_gpio =
458 		ddata->ctrl_gpios[PHY_MDM6600_RESET];
459 
460 	ddata->enabled = false;
461 	phy_mdm6600_cmd(ddata, PHY_MDM6600_CMD_BP_SHUTDOWN_REQ);
462 	msleep(100);
463 
464 	gpiod_set_value_cansleep(reset_gpio, 1);
465 
466 	dev_info(ddata->dev, "Waiting for power down request to complete.. ");
467 	if (wait_for_completion_timeout(&ddata->ack,
468 					msecs_to_jiffies(5000))) {
469 		if (ddata->status == PHY_MDM6600_STATUS_PANIC)
470 			dev_info(ddata->dev, "Powered down OK\n");
471 	} else {
472 		dev_err(ddata->dev, "Timed out powering down\n");
473 	}
474 }
475 
476 static void phy_mdm6600_deferred_power_on(struct work_struct *work)
477 {
478 	struct phy_mdm6600 *ddata;
479 	int error;
480 
481 	ddata = container_of(work, struct phy_mdm6600, bootup_work.work);
482 
483 	error = phy_mdm6600_device_power_on(ddata);
484 	if (error)
485 		dev_err(ddata->dev, "Device not functional\n");
486 }
487 
488 /*
489  * USB suspend puts mdm6600 into low power mode. For any n_gsm using apps,
490  * we need to keep the modem awake by kicking it's mode0 GPIO. This will
491  * keep the modem awake for about 1.2 seconds. When no n_gsm apps are using
492  * the modem, runtime PM auto mode can be enabled so modem can enter low
493  * power mode.
494  */
495 static void phy_mdm6600_wake_modem(struct phy_mdm6600 *ddata)
496 {
497 	struct gpio_desc *mode_gpio0;
498 
499 	mode_gpio0 = ddata->mode_gpios->desc[PHY_MDM6600_MODE0];
500 	gpiod_set_value_cansleep(mode_gpio0, 1);
501 	usleep_range(5, 15);
502 	gpiod_set_value_cansleep(mode_gpio0, 0);
503 	if (ddata->awake)
504 		usleep_range(5, 15);
505 	else
506 		msleep(MDM6600_MODEM_WAKE_DELAY_MS);
507 }
508 
509 static void phy_mdm6600_modem_wake(struct work_struct *work)
510 {
511 	struct phy_mdm6600 *ddata;
512 
513 	ddata = container_of(work, struct phy_mdm6600, modem_wake_work.work);
514 	phy_mdm6600_wake_modem(ddata);
515 
516 	/*
517 	 * The modem does not always stay awake 1.2 seconds after toggling
518 	 * the wake GPIO, and sometimes it idles after about some 600 ms
519 	 * making writes time out.
520 	 */
521 	schedule_delayed_work(&ddata->modem_wake_work,
522 			      msecs_to_jiffies(PHY_MDM6600_WAKE_KICK_MS));
523 }
524 
525 static int __maybe_unused phy_mdm6600_runtime_suspend(struct device *dev)
526 {
527 	struct phy_mdm6600 *ddata = dev_get_drvdata(dev);
528 
529 	cancel_delayed_work_sync(&ddata->modem_wake_work);
530 	ddata->awake = false;
531 
532 	return 0;
533 }
534 
535 static int __maybe_unused phy_mdm6600_runtime_resume(struct device *dev)
536 {
537 	struct phy_mdm6600 *ddata = dev_get_drvdata(dev);
538 
539 	phy_mdm6600_modem_wake(&ddata->modem_wake_work.work);
540 	ddata->awake = true;
541 
542 	return 0;
543 }
544 
545 static const struct dev_pm_ops phy_mdm6600_pm_ops = {
546 	SET_RUNTIME_PM_OPS(phy_mdm6600_runtime_suspend,
547 			   phy_mdm6600_runtime_resume, NULL)
548 };
549 
550 static const struct of_device_id phy_mdm6600_id_table[] = {
551 	{ .compatible = "motorola,mapphone-mdm6600", },
552 	{},
553 };
554 MODULE_DEVICE_TABLE(of, phy_mdm6600_id_table);
555 
556 static int phy_mdm6600_probe(struct platform_device *pdev)
557 {
558 	struct phy_mdm6600 *ddata;
559 	int error;
560 
561 	ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
562 	if (!ddata)
563 		return -ENOMEM;
564 
565 	INIT_DELAYED_WORK(&ddata->bootup_work,
566 			  phy_mdm6600_deferred_power_on);
567 	INIT_DELAYED_WORK(&ddata->status_work, phy_mdm6600_status);
568 	INIT_DELAYED_WORK(&ddata->modem_wake_work, phy_mdm6600_modem_wake);
569 	init_completion(&ddata->ack);
570 
571 	ddata->dev = &pdev->dev;
572 	platform_set_drvdata(pdev, ddata);
573 
574 	/* Active state selected in phy_mdm6600_power_on() */
575 	error = pinctrl_pm_select_sleep_state(ddata->dev);
576 	if (error)
577 		dev_warn(ddata->dev, "%s: error with sleep_state: %i\n",
578 			 __func__, error);
579 
580 	error = phy_mdm6600_init_lines(ddata);
581 	if (error)
582 		return error;
583 
584 	phy_mdm6600_init_irq(ddata);
585 	schedule_delayed_work(&ddata->bootup_work, 0);
586 
587 	/*
588 	 * See phy_mdm6600_device_power_on(). We should be able
589 	 * to remove this eventually when ohci-platform can deal
590 	 * with -EPROBE_DEFER.
591 	 */
592 	msleep(PHY_MDM6600_PHY_DELAY_MS + 500);
593 
594 	/*
595 	 * Enable PM runtime only after PHY has been powered up properly.
596 	 * It is currently only needed after USB suspends mdm6600 and n_gsm
597 	 * needs to access the device. We don't want to do this earlier as
598 	 * gpio mode0 pin doubles as mdm6600 wake-up gpio.
599 	 */
600 	pm_runtime_use_autosuspend(ddata->dev);
601 	pm_runtime_set_autosuspend_delay(ddata->dev,
602 					 MDM6600_MODEM_IDLE_DELAY_MS);
603 	pm_runtime_enable(ddata->dev);
604 	error = pm_runtime_get_sync(ddata->dev);
605 	if (error < 0) {
606 		dev_warn(ddata->dev, "failed to wake modem: %i\n", error);
607 		pm_runtime_put_noidle(ddata->dev);
608 		goto cleanup;
609 	}
610 
611 	ddata->generic_phy = devm_phy_create(ddata->dev, NULL, &gpio_usb_ops);
612 	if (IS_ERR(ddata->generic_phy)) {
613 		error = PTR_ERR(ddata->generic_phy);
614 		goto idle;
615 	}
616 
617 	phy_set_drvdata(ddata->generic_phy, ddata);
618 
619 	ddata->phy_provider =
620 		devm_of_phy_provider_register(ddata->dev,
621 					      of_phy_simple_xlate);
622 	if (IS_ERR(ddata->phy_provider))
623 		error = PTR_ERR(ddata->phy_provider);
624 
625 idle:
626 	pm_runtime_mark_last_busy(ddata->dev);
627 	pm_runtime_put_autosuspend(ddata->dev);
628 
629 cleanup:
630 	if (error < 0)
631 		phy_mdm6600_device_power_off(ddata);
632 
633 	return error;
634 }
635 
636 static int phy_mdm6600_remove(struct platform_device *pdev)
637 {
638 	struct phy_mdm6600 *ddata = platform_get_drvdata(pdev);
639 	struct gpio_desc *reset_gpio = ddata->ctrl_gpios[PHY_MDM6600_RESET];
640 
641 	pm_runtime_dont_use_autosuspend(ddata->dev);
642 	pm_runtime_put_sync(ddata->dev);
643 	pm_runtime_disable(ddata->dev);
644 
645 	if (!ddata->running)
646 		wait_for_completion_timeout(&ddata->ack,
647 			msecs_to_jiffies(PHY_MDM6600_ENABLED_DELAY_MS));
648 
649 	gpiod_set_value_cansleep(reset_gpio, 1);
650 	phy_mdm6600_device_power_off(ddata);
651 
652 	cancel_delayed_work_sync(&ddata->modem_wake_work);
653 	cancel_delayed_work_sync(&ddata->bootup_work);
654 	cancel_delayed_work_sync(&ddata->status_work);
655 
656 	return 0;
657 }
658 
659 static struct platform_driver phy_mdm6600_driver = {
660 	.probe = phy_mdm6600_probe,
661 	.remove = phy_mdm6600_remove,
662 	.driver = {
663 		.name = "phy-mapphone-mdm6600",
664 		.pm = &phy_mdm6600_pm_ops,
665 		.of_match_table = of_match_ptr(phy_mdm6600_id_table),
666 	},
667 };
668 
669 module_platform_driver(phy_mdm6600_driver);
670 
671 MODULE_ALIAS("platform:gpio_usb");
672 MODULE_AUTHOR("Tony Lindgren <tony@atomide.com>");
673 MODULE_DESCRIPTION("mdm6600 gpio usb phy driver");
674 MODULE_LICENSE("GPL v2");
675