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1 /*
2  * Motorola CPCAP PMIC USB PHY driver
3  * Copyright (C) 2017 Tony Lindgren <tony@atomide.com>
4  *
5  * Some parts based on earlier Motorola Linux kernel tree code in
6  * board-mapphone-usb.c and cpcap-usb-det.c:
7  * Copyright (C) 2007 - 2011 Motorola, Inc.
8  *
9  * This program is free software; you can redistribute it and/or
10  * modify it under the terms of the GNU General Public License as
11  * published by the Free Software Foundation version 2.
12  *
13  * This program is distributed "as is" WITHOUT ANY WARRANTY of any
14  * kind, whether express or implied; without even the implied warranty
15  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16  * GNU General Public License for more details.
17  */
18 
19 #include <linux/atomic.h>
20 #include <linux/clk.h>
21 #include <linux/delay.h>
22 #include <linux/err.h>
23 #include <linux/io.h>
24 #include <linux/module.h>
25 #include <linux/of.h>
26 #include <linux/of_platform.h>
27 #include <linux/iio/consumer.h>
28 #include <linux/pinctrl/consumer.h>
29 #include <linux/platform_device.h>
30 #include <linux/regmap.h>
31 #include <linux/slab.h>
32 
33 #include <linux/gpio/consumer.h>
34 #include <linux/mfd/motorola-cpcap.h>
35 #include <linux/phy/omap_usb.h>
36 #include <linux/phy/phy.h>
37 #include <linux/regulator/consumer.h>
38 #include <linux/usb/musb.h>
39 
40 /* CPCAP_REG_USBC1 register bits */
41 #define CPCAP_BIT_IDPULSE		BIT(15)
42 #define CPCAP_BIT_ID100KPU		BIT(14)
43 #define CPCAP_BIT_IDPUCNTRL		BIT(13)
44 #define CPCAP_BIT_IDPU			BIT(12)
45 #define CPCAP_BIT_IDPD			BIT(11)
46 #define CPCAP_BIT_VBUSCHRGTMR3		BIT(10)
47 #define CPCAP_BIT_VBUSCHRGTMR2		BIT(9)
48 #define CPCAP_BIT_VBUSCHRGTMR1		BIT(8)
49 #define CPCAP_BIT_VBUSCHRGTMR0		BIT(7)
50 #define CPCAP_BIT_VBUSPU		BIT(6)
51 #define CPCAP_BIT_VBUSPD		BIT(5)
52 #define CPCAP_BIT_DMPD			BIT(4)
53 #define CPCAP_BIT_DPPD			BIT(3)
54 #define CPCAP_BIT_DM1K5PU		BIT(2)
55 #define CPCAP_BIT_DP1K5PU		BIT(1)
56 #define CPCAP_BIT_DP150KPU		BIT(0)
57 
58 /* CPCAP_REG_USBC2 register bits */
59 #define CPCAP_BIT_ZHSDRV1		BIT(15)
60 #define CPCAP_BIT_ZHSDRV0		BIT(14)
61 #define CPCAP_BIT_DPLLCLKREQ		BIT(13)
62 #define CPCAP_BIT_SE0CONN		BIT(12)
63 #define CPCAP_BIT_UARTTXTRI		BIT(11)
64 #define CPCAP_BIT_UARTSWAP		BIT(10)
65 #define CPCAP_BIT_UARTMUX1		BIT(9)
66 #define CPCAP_BIT_UARTMUX0		BIT(8)
67 #define CPCAP_BIT_ULPISTPLOW		BIT(7)
68 #define CPCAP_BIT_TXENPOL		BIT(6)
69 #define CPCAP_BIT_USBXCVREN		BIT(5)
70 #define CPCAP_BIT_USBCNTRL		BIT(4)
71 #define CPCAP_BIT_USBSUSPEND		BIT(3)
72 #define CPCAP_BIT_EMUMODE2		BIT(2)
73 #define CPCAP_BIT_EMUMODE1		BIT(1)
74 #define CPCAP_BIT_EMUMODE0		BIT(0)
75 
76 /* CPCAP_REG_USBC3 register bits */
77 #define CPCAP_BIT_SPARE_898_15		BIT(15)
78 #define CPCAP_BIT_IHSTX03		BIT(14)
79 #define CPCAP_BIT_IHSTX02		BIT(13)
80 #define CPCAP_BIT_IHSTX01		BIT(12)
81 #define CPCAP_BIT_IHSTX0		BIT(11)
82 #define CPCAP_BIT_IDPU_SPI		BIT(10)
83 #define CPCAP_BIT_UNUSED_898_9		BIT(9)
84 #define CPCAP_BIT_VBUSSTBY_EN		BIT(8)
85 #define CPCAP_BIT_VBUSEN_SPI		BIT(7)
86 #define CPCAP_BIT_VBUSPU_SPI		BIT(6)
87 #define CPCAP_BIT_VBUSPD_SPI		BIT(5)
88 #define CPCAP_BIT_DMPD_SPI		BIT(4)
89 #define CPCAP_BIT_DPPD_SPI		BIT(3)
90 #define CPCAP_BIT_SUSPEND_SPI		BIT(2)
91 #define CPCAP_BIT_PU_SPI		BIT(1)
92 #define CPCAP_BIT_ULPI_SPI_SEL		BIT(0)
93 
94 struct cpcap_usb_ints_state {
95 	bool id_ground;
96 	bool id_float;
97 	bool chrg_det;
98 	bool rvrs_chrg;
99 	bool vbusov;
100 
101 	bool chrg_se1b;
102 	bool se0conn;
103 	bool rvrs_mode;
104 	bool chrgcurr1;
105 	bool vbusvld;
106 	bool sessvld;
107 	bool sessend;
108 	bool se1;
109 
110 	bool battdetb;
111 	bool dm;
112 	bool dp;
113 };
114 
115 enum cpcap_gpio_mode {
116 	CPCAP_DM_DP,
117 	CPCAP_MDM_RX_TX,
118 	CPCAP_UNKNOWN_DISABLED,	/* Seems to disable USB lines */
119 	CPCAP_OTG_DM_DP,
120 };
121 
122 struct cpcap_phy_ddata {
123 	struct regmap *reg;
124 	struct device *dev;
125 	struct clk *refclk;
126 	struct usb_phy phy;
127 	struct delayed_work detect_work;
128 	struct pinctrl *pins;
129 	struct pinctrl_state *pins_ulpi;
130 	struct pinctrl_state *pins_utmi;
131 	struct pinctrl_state *pins_uart;
132 	struct gpio_desc *gpio[2];
133 	struct iio_channel *vbus;
134 	struct iio_channel *id;
135 	struct regulator *vusb;
136 	atomic_t active;
137 };
138 
cpcap_usb_vbus_valid(struct cpcap_phy_ddata * ddata)139 static bool cpcap_usb_vbus_valid(struct cpcap_phy_ddata *ddata)
140 {
141 	int error, value = 0;
142 
143 	error = iio_read_channel_processed(ddata->vbus, &value);
144 	if (error >= 0)
145 		return value > 3900 ? true : false;
146 
147 	dev_err(ddata->dev, "error reading VBUS: %i\n", error);
148 
149 	return false;
150 }
151 
cpcap_usb_phy_set_host(struct usb_otg * otg,struct usb_bus * host)152 static int cpcap_usb_phy_set_host(struct usb_otg *otg, struct usb_bus *host)
153 {
154 	otg->host = host;
155 	if (!host)
156 		otg->state = OTG_STATE_UNDEFINED;
157 
158 	return 0;
159 }
160 
cpcap_usb_phy_set_peripheral(struct usb_otg * otg,struct usb_gadget * gadget)161 static int cpcap_usb_phy_set_peripheral(struct usb_otg *otg,
162 					struct usb_gadget *gadget)
163 {
164 	otg->gadget = gadget;
165 	if (!gadget)
166 		otg->state = OTG_STATE_UNDEFINED;
167 
168 	return 0;
169 }
170 
171 static const struct phy_ops ops = {
172 	.owner		= THIS_MODULE,
173 };
174 
cpcap_phy_get_ints_state(struct cpcap_phy_ddata * ddata,struct cpcap_usb_ints_state * s)175 static int cpcap_phy_get_ints_state(struct cpcap_phy_ddata *ddata,
176 				    struct cpcap_usb_ints_state *s)
177 {
178 	int val, error;
179 
180 	error = regmap_read(ddata->reg, CPCAP_REG_INTS1, &val);
181 	if (error)
182 		return error;
183 
184 	s->id_ground = val & BIT(15);
185 	s->id_float = val & BIT(14);
186 	s->vbusov = val & BIT(11);
187 
188 	error = regmap_read(ddata->reg, CPCAP_REG_INTS2, &val);
189 	if (error)
190 		return error;
191 
192 	s->vbusvld = val & BIT(3);
193 	s->sessvld = val & BIT(2);
194 	s->sessend = val & BIT(1);
195 	s->se1 = val & BIT(0);
196 
197 	error = regmap_read(ddata->reg, CPCAP_REG_INTS4, &val);
198 	if (error)
199 		return error;
200 
201 	s->dm = val & BIT(1);
202 	s->dp = val & BIT(0);
203 
204 	return 0;
205 }
206 
207 static int cpcap_usb_set_uart_mode(struct cpcap_phy_ddata *ddata);
208 static int cpcap_usb_set_usb_mode(struct cpcap_phy_ddata *ddata);
209 
cpcap_usb_try_musb_mailbox(struct cpcap_phy_ddata * ddata,enum musb_vbus_id_status status)210 static void cpcap_usb_try_musb_mailbox(struct cpcap_phy_ddata *ddata,
211 				       enum musb_vbus_id_status status)
212 {
213 	int error;
214 
215 	error = musb_mailbox(status);
216 	if (!error)
217 		return;
218 
219 	dev_dbg(ddata->dev, "%s: musb_mailbox failed: %i\n",
220 		__func__, error);
221 }
222 
cpcap_usb_detect(struct work_struct * work)223 static void cpcap_usb_detect(struct work_struct *work)
224 {
225 	struct cpcap_phy_ddata *ddata;
226 	struct cpcap_usb_ints_state s;
227 	bool vbus = false;
228 	int error;
229 
230 	ddata = container_of(work, struct cpcap_phy_ddata, detect_work.work);
231 
232 	error = cpcap_phy_get_ints_state(ddata, &s);
233 	if (error)
234 		return;
235 
236 	if (s.id_ground) {
237 		dev_dbg(ddata->dev, "id ground, USB host mode\n");
238 		error = cpcap_usb_set_usb_mode(ddata);
239 		if (error)
240 			goto out_err;
241 
242 		cpcap_usb_try_musb_mailbox(ddata, MUSB_ID_GROUND);
243 
244 		error = regmap_update_bits(ddata->reg, CPCAP_REG_USBC3,
245 					   CPCAP_BIT_VBUSSTBY_EN,
246 					   CPCAP_BIT_VBUSSTBY_EN);
247 		if (error)
248 			goto out_err;
249 
250 		return;
251 	}
252 
253 	error = regmap_update_bits(ddata->reg, CPCAP_REG_USBC3,
254 				   CPCAP_BIT_VBUSSTBY_EN, 0);
255 	if (error)
256 		goto out_err;
257 
258 	vbus = cpcap_usb_vbus_valid(ddata);
259 
260 	if (vbus) {
261 		/* Are we connected to a docking station with vbus? */
262 		if (s.id_ground) {
263 			dev_dbg(ddata->dev, "connected to a dock\n");
264 
265 			/* No VBUS needed with docks */
266 			error = cpcap_usb_set_usb_mode(ddata);
267 			if (error)
268 				goto out_err;
269 			cpcap_usb_try_musb_mailbox(ddata, MUSB_ID_GROUND);
270 
271 			return;
272 		}
273 
274 		/* Otherwise assume we're connected to a USB host */
275 		dev_dbg(ddata->dev, "connected to USB host\n");
276 		error = cpcap_usb_set_usb_mode(ddata);
277 		if (error)
278 			goto out_err;
279 		cpcap_usb_try_musb_mailbox(ddata, MUSB_VBUS_VALID);
280 
281 		return;
282 	}
283 
284 	cpcap_usb_try_musb_mailbox(ddata, MUSB_VBUS_OFF);
285 
286 	/* Default to debug UART mode */
287 	error = cpcap_usb_set_uart_mode(ddata);
288 	if (error)
289 		goto out_err;
290 
291 	dev_dbg(ddata->dev, "set UART mode\n");
292 
293 	return;
294 
295 out_err:
296 	dev_err(ddata->dev, "error setting cable state: %i\n", error);
297 }
298 
cpcap_phy_irq_thread(int irq,void * data)299 static irqreturn_t cpcap_phy_irq_thread(int irq, void *data)
300 {
301 	struct cpcap_phy_ddata *ddata = data;
302 
303 	if (!atomic_read(&ddata->active))
304 		return IRQ_NONE;
305 
306 	schedule_delayed_work(&ddata->detect_work, msecs_to_jiffies(1));
307 
308 	return IRQ_HANDLED;
309 }
310 
cpcap_usb_init_irq(struct platform_device * pdev,struct cpcap_phy_ddata * ddata,const char * name)311 static int cpcap_usb_init_irq(struct platform_device *pdev,
312 			      struct cpcap_phy_ddata *ddata,
313 			      const char *name)
314 {
315 	int irq, error;
316 
317 	irq = platform_get_irq_byname(pdev, name);
318 	if (irq < 0)
319 		return -ENODEV;
320 
321 	error = devm_request_threaded_irq(ddata->dev, irq, NULL,
322 					  cpcap_phy_irq_thread,
323 					  IRQF_SHARED,
324 					  name, ddata);
325 	if (error) {
326 		dev_err(ddata->dev, "could not get irq %s: %i\n",
327 			name, error);
328 
329 		return error;
330 	}
331 
332 	return 0;
333 }
334 
335 static const char * const cpcap_phy_irqs[] = {
336 	/* REG_INT_0 */
337 	"id_ground", "id_float",
338 
339 	/* REG_INT1 */
340 	"se0conn", "vbusvld", "sessvld", "sessend", "se1",
341 
342 	/* REG_INT_3 */
343 	"dm", "dp",
344 };
345 
cpcap_usb_init_interrupts(struct platform_device * pdev,struct cpcap_phy_ddata * ddata)346 static int cpcap_usb_init_interrupts(struct platform_device *pdev,
347 				     struct cpcap_phy_ddata *ddata)
348 {
349 	int i, error;
350 
351 	for (i = 0; i < ARRAY_SIZE(cpcap_phy_irqs); i++) {
352 		error = cpcap_usb_init_irq(pdev, ddata, cpcap_phy_irqs[i]);
353 		if (error)
354 			return error;
355 	}
356 
357 	return 0;
358 }
359 
360 /*
361  * Optional pins and modes. At least Motorola mapphone devices
362  * are using two GPIOs and dynamic pinctrl to multiplex PHY pins
363  * to UART, ULPI or UTMI mode.
364  */
365 
cpcap_usb_gpio_set_mode(struct cpcap_phy_ddata * ddata,enum cpcap_gpio_mode mode)366 static int cpcap_usb_gpio_set_mode(struct cpcap_phy_ddata *ddata,
367 				   enum cpcap_gpio_mode mode)
368 {
369 	if (!ddata->gpio[0] || !ddata->gpio[1])
370 		return 0;
371 
372 	gpiod_set_value(ddata->gpio[0], mode & 1);
373 	gpiod_set_value(ddata->gpio[1], mode >> 1);
374 
375 	return 0;
376 }
377 
cpcap_usb_set_uart_mode(struct cpcap_phy_ddata * ddata)378 static int cpcap_usb_set_uart_mode(struct cpcap_phy_ddata *ddata)
379 {
380 	int error;
381 
382 	/* Disable lines to prevent glitches from waking up mdm6600 */
383 	error = cpcap_usb_gpio_set_mode(ddata, CPCAP_UNKNOWN_DISABLED);
384 	if (error)
385 		goto out_err;
386 
387 	if (ddata->pins_uart) {
388 		error = pinctrl_select_state(ddata->pins, ddata->pins_uart);
389 		if (error)
390 			goto out_err;
391 	}
392 
393 	error = regmap_update_bits(ddata->reg, CPCAP_REG_USBC1,
394 				   CPCAP_BIT_VBUSPD,
395 				   CPCAP_BIT_VBUSPD);
396 	if (error)
397 		goto out_err;
398 
399 	error = regmap_update_bits(ddata->reg, CPCAP_REG_USBC2,
400 				   0xffff, CPCAP_BIT_UARTMUX0 |
401 				   CPCAP_BIT_EMUMODE0);
402 	if (error)
403 		goto out_err;
404 
405 	error = regmap_update_bits(ddata->reg, CPCAP_REG_USBC3, 0x7fff,
406 				   CPCAP_BIT_IDPU_SPI);
407 	if (error)
408 		goto out_err;
409 
410 	/* Enable UART mode */
411 	error = cpcap_usb_gpio_set_mode(ddata, CPCAP_DM_DP);
412 	if (error)
413 		goto out_err;
414 
415 	return 0;
416 
417 out_err:
418 	dev_err(ddata->dev, "%s failed with %i\n", __func__, error);
419 
420 	return error;
421 }
422 
cpcap_usb_set_usb_mode(struct cpcap_phy_ddata * ddata)423 static int cpcap_usb_set_usb_mode(struct cpcap_phy_ddata *ddata)
424 {
425 	int error;
426 
427 	/* Disable lines to prevent glitches from waking up mdm6600 */
428 	error = cpcap_usb_gpio_set_mode(ddata, CPCAP_UNKNOWN_DISABLED);
429 	if (error)
430 		return error;
431 
432 	if (ddata->pins_utmi) {
433 		error = pinctrl_select_state(ddata->pins, ddata->pins_utmi);
434 		if (error) {
435 			dev_err(ddata->dev, "could not set usb mode: %i\n",
436 				error);
437 
438 			return error;
439 		}
440 	}
441 
442 	error = regmap_update_bits(ddata->reg, CPCAP_REG_USBC1,
443 				   CPCAP_BIT_VBUSPD, 0);
444 	if (error)
445 		goto out_err;
446 
447 	error = regmap_update_bits(ddata->reg, CPCAP_REG_USBC2,
448 				   CPCAP_BIT_USBXCVREN,
449 				   CPCAP_BIT_USBXCVREN);
450 	if (error)
451 		goto out_err;
452 
453 	error = regmap_update_bits(ddata->reg, CPCAP_REG_USBC3,
454 				   CPCAP_BIT_PU_SPI |
455 				   CPCAP_BIT_DMPD_SPI |
456 				   CPCAP_BIT_DPPD_SPI |
457 				   CPCAP_BIT_SUSPEND_SPI |
458 				   CPCAP_BIT_ULPI_SPI_SEL, 0);
459 	if (error)
460 		goto out_err;
461 
462 	error = regmap_update_bits(ddata->reg, CPCAP_REG_USBC2,
463 				   CPCAP_BIT_USBXCVREN,
464 				   CPCAP_BIT_USBXCVREN);
465 	if (error)
466 		goto out_err;
467 
468 	/* Enable USB mode */
469 	error = cpcap_usb_gpio_set_mode(ddata, CPCAP_OTG_DM_DP);
470 	if (error)
471 		goto out_err;
472 
473 	return 0;
474 
475 out_err:
476 	dev_err(ddata->dev, "%s failed with %i\n", __func__, error);
477 
478 	return error;
479 }
480 
cpcap_usb_init_optional_pins(struct cpcap_phy_ddata * ddata)481 static int cpcap_usb_init_optional_pins(struct cpcap_phy_ddata *ddata)
482 {
483 	ddata->pins = devm_pinctrl_get(ddata->dev);
484 	if (IS_ERR(ddata->pins)) {
485 		dev_info(ddata->dev, "default pins not configured: %ld\n",
486 			 PTR_ERR(ddata->pins));
487 		ddata->pins = NULL;
488 
489 		return 0;
490 	}
491 
492 	ddata->pins_ulpi = pinctrl_lookup_state(ddata->pins, "ulpi");
493 	if (IS_ERR(ddata->pins_ulpi)) {
494 		dev_info(ddata->dev, "ulpi pins not configured\n");
495 		ddata->pins_ulpi = NULL;
496 	}
497 
498 	ddata->pins_utmi = pinctrl_lookup_state(ddata->pins, "utmi");
499 	if (IS_ERR(ddata->pins_utmi)) {
500 		dev_info(ddata->dev, "utmi pins not configured\n");
501 		ddata->pins_utmi = NULL;
502 	}
503 
504 	ddata->pins_uart = pinctrl_lookup_state(ddata->pins, "uart");
505 	if (IS_ERR(ddata->pins_uart)) {
506 		dev_info(ddata->dev, "uart pins not configured\n");
507 		ddata->pins_uart = NULL;
508 	}
509 
510 	if (ddata->pins_uart)
511 		return pinctrl_select_state(ddata->pins, ddata->pins_uart);
512 
513 	return 0;
514 }
515 
cpcap_usb_init_optional_gpios(struct cpcap_phy_ddata * ddata)516 static void cpcap_usb_init_optional_gpios(struct cpcap_phy_ddata *ddata)
517 {
518 	int i;
519 
520 	for (i = 0; i < 2; i++) {
521 		ddata->gpio[i] = devm_gpiod_get_index(ddata->dev, "mode",
522 						      i, GPIOD_OUT_HIGH);
523 		if (IS_ERR(ddata->gpio[i])) {
524 			dev_info(ddata->dev, "no mode change GPIO%i: %li\n",
525 				 i, PTR_ERR(ddata->gpio[i]));
526 			ddata->gpio[i] = NULL;
527 		}
528 	}
529 }
530 
cpcap_usb_init_iio(struct cpcap_phy_ddata * ddata)531 static int cpcap_usb_init_iio(struct cpcap_phy_ddata *ddata)
532 {
533 	enum iio_chan_type type;
534 	int error;
535 
536 	ddata->vbus = devm_iio_channel_get(ddata->dev, "vbus");
537 	if (IS_ERR(ddata->vbus)) {
538 		error = PTR_ERR(ddata->vbus);
539 		goto out_err;
540 	}
541 
542 	if (!ddata->vbus->indio_dev) {
543 		error = -ENXIO;
544 		goto out_err;
545 	}
546 
547 	error = iio_get_channel_type(ddata->vbus, &type);
548 	if (error < 0)
549 		goto out_err;
550 
551 	if (type != IIO_VOLTAGE) {
552 		error = -EINVAL;
553 		goto out_err;
554 	}
555 
556 	return 0;
557 
558 out_err:
559 	dev_err(ddata->dev, "could not initialize VBUS or ID IIO: %i\n",
560 		error);
561 
562 	return error;
563 }
564 
565 #ifdef CONFIG_OF
566 static const struct of_device_id cpcap_usb_phy_id_table[] = {
567 	{
568 		.compatible = "motorola,cpcap-usb-phy",
569 	},
570 	{
571 		.compatible = "motorola,mapphone-cpcap-usb-phy",
572 	},
573 	{},
574 };
575 MODULE_DEVICE_TABLE(of, cpcap_usb_phy_id_table);
576 #endif
577 
cpcap_usb_phy_probe(struct platform_device * pdev)578 static int cpcap_usb_phy_probe(struct platform_device *pdev)
579 {
580 	struct cpcap_phy_ddata *ddata;
581 	struct phy *generic_phy;
582 	struct phy_provider *phy_provider;
583 	struct usb_otg *otg;
584 	const struct of_device_id *of_id;
585 	int error;
586 
587 	of_id = of_match_device(of_match_ptr(cpcap_usb_phy_id_table),
588 				&pdev->dev);
589 	if (!of_id)
590 		return -EINVAL;
591 
592 	ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
593 	if (!ddata)
594 		return -ENOMEM;
595 
596 	ddata->reg = dev_get_regmap(pdev->dev.parent, NULL);
597 	if (!ddata->reg)
598 		return -ENODEV;
599 
600 	otg = devm_kzalloc(&pdev->dev, sizeof(*otg), GFP_KERNEL);
601 	if (!otg)
602 		return -ENOMEM;
603 
604 	ddata->dev = &pdev->dev;
605 	ddata->phy.dev = ddata->dev;
606 	ddata->phy.label = "cpcap_usb_phy";
607 	ddata->phy.otg = otg;
608 	ddata->phy.type = USB_PHY_TYPE_USB2;
609 	otg->set_host = cpcap_usb_phy_set_host;
610 	otg->set_peripheral = cpcap_usb_phy_set_peripheral;
611 	otg->usb_phy = &ddata->phy;
612 	INIT_DELAYED_WORK(&ddata->detect_work, cpcap_usb_detect);
613 	platform_set_drvdata(pdev, ddata);
614 
615 	ddata->vusb = devm_regulator_get(&pdev->dev, "vusb");
616 	if (IS_ERR(ddata->vusb))
617 		return PTR_ERR(ddata->vusb);
618 
619 	error = regulator_enable(ddata->vusb);
620 	if (error)
621 		return error;
622 
623 	generic_phy = devm_phy_create(ddata->dev, NULL, &ops);
624 	if (IS_ERR(generic_phy)) {
625 		error = PTR_ERR(generic_phy);
626 		return PTR_ERR(generic_phy);
627 	}
628 
629 	phy_set_drvdata(generic_phy, ddata);
630 
631 	phy_provider = devm_of_phy_provider_register(ddata->dev,
632 						     of_phy_simple_xlate);
633 	if (IS_ERR(phy_provider))
634 		return PTR_ERR(phy_provider);
635 
636 	error = cpcap_usb_init_optional_pins(ddata);
637 	if (error)
638 		return error;
639 
640 	cpcap_usb_init_optional_gpios(ddata);
641 
642 	error = cpcap_usb_init_iio(ddata);
643 	if (error)
644 		return error;
645 
646 	error = cpcap_usb_init_interrupts(pdev, ddata);
647 	if (error)
648 		return error;
649 
650 	usb_add_phy_dev(&ddata->phy);
651 	atomic_set(&ddata->active, 1);
652 	schedule_delayed_work(&ddata->detect_work, msecs_to_jiffies(1));
653 
654 	return 0;
655 }
656 
cpcap_usb_phy_remove(struct platform_device * pdev)657 static int cpcap_usb_phy_remove(struct platform_device *pdev)
658 {
659 	struct cpcap_phy_ddata *ddata = platform_get_drvdata(pdev);
660 	int error;
661 
662 	atomic_set(&ddata->active, 0);
663 	error = cpcap_usb_set_uart_mode(ddata);
664 	if (error)
665 		dev_err(ddata->dev, "could not set UART mode\n");
666 
667 	cpcap_usb_try_musb_mailbox(ddata, MUSB_VBUS_OFF);
668 
669 	usb_remove_phy(&ddata->phy);
670 	cancel_delayed_work_sync(&ddata->detect_work);
671 	clk_unprepare(ddata->refclk);
672 	regulator_disable(ddata->vusb);
673 
674 	return 0;
675 }
676 
677 static struct platform_driver cpcap_usb_phy_driver = {
678 	.probe		= cpcap_usb_phy_probe,
679 	.remove		= cpcap_usb_phy_remove,
680 	.driver		= {
681 		.name	= "cpcap-usb-phy",
682 		.of_match_table = of_match_ptr(cpcap_usb_phy_id_table),
683 	},
684 };
685 
686 module_platform_driver(cpcap_usb_phy_driver);
687 
688 MODULE_ALIAS("platform:cpcap_usb");
689 MODULE_AUTHOR("Tony Lindgren <tony@atomide.com>");
690 MODULE_DESCRIPTION("CPCAP usb phy driver");
691 MODULE_LICENSE("GPL v2");
692