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9c92ab61 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
9dee7a72 MK |
2 | /* |
3 | * Driver for voltage controller regulators | |
4 | * | |
5 | * Copyright (C) 2017 Google, Inc. | |
9dee7a72 MK |
6 | */ |
7 | ||
8 | #include <linux/delay.h> | |
9 | #include <linux/err.h> | |
10 | #include <linux/init.h> | |
11 | #include <linux/module.h> | |
12 | #include <linux/of.h> | |
045a44d4 | 13 | #include <linux/platform_device.h> |
e9153311 | 14 | #include <linux/regulator/coupler.h> |
9dee7a72 MK |
15 | #include <linux/regulator/driver.h> |
16 | #include <linux/regulator/of_regulator.h> | |
17 | #include <linux/sort.h> | |
18 | ||
e9153311 EBS |
19 | #include "internal.h" |
20 | ||
9dee7a72 MK |
21 | struct vctrl_voltage_range { |
22 | int min_uV; | |
23 | int max_uV; | |
24 | }; | |
25 | ||
26 | struct vctrl_voltage_ranges { | |
27 | struct vctrl_voltage_range ctrl; | |
28 | struct vctrl_voltage_range out; | |
29 | }; | |
30 | ||
31 | struct vctrl_voltage_table { | |
32 | int ctrl; | |
33 | int out; | |
34 | int ovp_min_sel; | |
35 | }; | |
36 | ||
37 | struct vctrl_data { | |
38 | struct regulator_dev *rdev; | |
39 | struct regulator_desc desc; | |
9dee7a72 MK |
40 | bool enabled; |
41 | unsigned int min_slew_down_rate; | |
42 | unsigned int ovp_threshold; | |
43 | struct vctrl_voltage_ranges vrange; | |
44 | struct vctrl_voltage_table *vtable; | |
45 | unsigned int sel; | |
46 | }; | |
47 | ||
48 | static int vctrl_calc_ctrl_voltage(struct vctrl_data *vctrl, int out_uV) | |
49 | { | |
50 | struct vctrl_voltage_range *ctrl = &vctrl->vrange.ctrl; | |
51 | struct vctrl_voltage_range *out = &vctrl->vrange.out; | |
52 | ||
53 | return ctrl->min_uV + | |
54 | DIV_ROUND_CLOSEST_ULL((s64)(out_uV - out->min_uV) * | |
55 | (ctrl->max_uV - ctrl->min_uV), | |
56 | out->max_uV - out->min_uV); | |
57 | } | |
58 | ||
59 | static int vctrl_calc_output_voltage(struct vctrl_data *vctrl, int ctrl_uV) | |
60 | { | |
61 | struct vctrl_voltage_range *ctrl = &vctrl->vrange.ctrl; | |
62 | struct vctrl_voltage_range *out = &vctrl->vrange.out; | |
63 | ||
64 | if (ctrl_uV < 0) { | |
65 | pr_err("vctrl: failed to get control voltage\n"); | |
66 | return ctrl_uV; | |
67 | } | |
68 | ||
69 | if (ctrl_uV < ctrl->min_uV) | |
70 | return out->min_uV; | |
71 | ||
72 | if (ctrl_uV > ctrl->max_uV) | |
73 | return out->max_uV; | |
74 | ||
75 | return out->min_uV + | |
76 | DIV_ROUND_CLOSEST_ULL((s64)(ctrl_uV - ctrl->min_uV) * | |
77 | (out->max_uV - out->min_uV), | |
78 | ctrl->max_uV - ctrl->min_uV); | |
79 | } | |
80 | ||
81 | static int vctrl_get_voltage(struct regulator_dev *rdev) | |
82 | { | |
83 | struct vctrl_data *vctrl = rdev_get_drvdata(rdev); | |
21e39809 CYT |
84 | int ctrl_uV; |
85 | ||
86 | if (!rdev->supply) | |
87 | return -EPROBE_DEFER; | |
88 | ||
89 | ctrl_uV = regulator_get_voltage_rdev(rdev->supply->rdev); | |
9dee7a72 MK |
90 | |
91 | return vctrl_calc_output_voltage(vctrl, ctrl_uV); | |
92 | } | |
93 | ||
94 | static int vctrl_set_voltage(struct regulator_dev *rdev, | |
95 | int req_min_uV, int req_max_uV, | |
96 | unsigned int *selector) | |
97 | { | |
98 | struct vctrl_data *vctrl = rdev_get_drvdata(rdev); | |
21e39809 CYT |
99 | int orig_ctrl_uV; |
100 | int uV; | |
9dee7a72 MK |
101 | int ret; |
102 | ||
21e39809 CYT |
103 | if (!rdev->supply) |
104 | return -EPROBE_DEFER; | |
105 | ||
106 | orig_ctrl_uV = regulator_get_voltage_rdev(rdev->supply->rdev); | |
107 | uV = vctrl_calc_output_voltage(vctrl, orig_ctrl_uV); | |
108 | ||
9dee7a72 MK |
109 | if (req_min_uV >= uV || !vctrl->ovp_threshold) |
110 | /* voltage rising or no OVP */ | |
21e39809 | 111 | return regulator_set_voltage_rdev(rdev->supply->rdev, |
9dee7a72 | 112 | vctrl_calc_ctrl_voltage(vctrl, req_min_uV), |
e9153311 EBS |
113 | vctrl_calc_ctrl_voltage(vctrl, req_max_uV), |
114 | PM_SUSPEND_ON); | |
9dee7a72 MK |
115 | |
116 | while (uV > req_min_uV) { | |
117 | int max_drop_uV = (uV * vctrl->ovp_threshold) / 100; | |
118 | int next_uV; | |
119 | int next_ctrl_uV; | |
120 | int delay; | |
121 | ||
122 | /* Make sure no infinite loop even in crazy cases */ | |
123 | if (max_drop_uV == 0) | |
124 | max_drop_uV = 1; | |
125 | ||
126 | next_uV = max_t(int, req_min_uV, uV - max_drop_uV); | |
127 | next_ctrl_uV = vctrl_calc_ctrl_voltage(vctrl, next_uV); | |
128 | ||
21e39809 | 129 | ret = regulator_set_voltage_rdev(rdev->supply->rdev, |
e9153311 | 130 | next_ctrl_uV, |
9dee7a72 | 131 | next_ctrl_uV, |
e9153311 | 132 | PM_SUSPEND_ON); |
9dee7a72 MK |
133 | if (ret) |
134 | goto err; | |
135 | ||
136 | delay = DIV_ROUND_UP(uV - next_uV, vctrl->min_slew_down_rate); | |
137 | usleep_range(delay, delay + DIV_ROUND_UP(delay, 10)); | |
138 | ||
139 | uV = next_uV; | |
140 | } | |
141 | ||
142 | return 0; | |
143 | ||
144 | err: | |
145 | /* Try to go back to original voltage */ | |
21e39809 | 146 | regulator_set_voltage_rdev(rdev->supply->rdev, orig_ctrl_uV, orig_ctrl_uV, |
e9153311 | 147 | PM_SUSPEND_ON); |
9dee7a72 MK |
148 | |
149 | return ret; | |
150 | } | |
151 | ||
152 | static int vctrl_get_voltage_sel(struct regulator_dev *rdev) | |
153 | { | |
154 | struct vctrl_data *vctrl = rdev_get_drvdata(rdev); | |
155 | ||
156 | return vctrl->sel; | |
157 | } | |
158 | ||
159 | static int vctrl_set_voltage_sel(struct regulator_dev *rdev, | |
160 | unsigned int selector) | |
161 | { | |
162 | struct vctrl_data *vctrl = rdev_get_drvdata(rdev); | |
9dee7a72 MK |
163 | unsigned int orig_sel = vctrl->sel; |
164 | int ret; | |
165 | ||
21e39809 CYT |
166 | if (!rdev->supply) |
167 | return -EPROBE_DEFER; | |
168 | ||
9dee7a72 MK |
169 | if (selector >= rdev->desc->n_voltages) |
170 | return -EINVAL; | |
171 | ||
172 | if (selector >= vctrl->sel || !vctrl->ovp_threshold) { | |
173 | /* voltage rising or no OVP */ | |
21e39809 | 174 | ret = regulator_set_voltage_rdev(rdev->supply->rdev, |
e9153311 | 175 | vctrl->vtable[selector].ctrl, |
9dee7a72 | 176 | vctrl->vtable[selector].ctrl, |
e9153311 | 177 | PM_SUSPEND_ON); |
9dee7a72 MK |
178 | if (!ret) |
179 | vctrl->sel = selector; | |
180 | ||
181 | return ret; | |
182 | } | |
183 | ||
184 | while (vctrl->sel != selector) { | |
185 | unsigned int next_sel; | |
186 | int delay; | |
187 | ||
8a317e00 | 188 | next_sel = max_t(unsigned int, selector, vctrl->vtable[vctrl->sel].ovp_min_sel); |
9dee7a72 | 189 | |
21e39809 | 190 | ret = regulator_set_voltage_rdev(rdev->supply->rdev, |
9dee7a72 | 191 | vctrl->vtable[next_sel].ctrl, |
e9153311 EBS |
192 | vctrl->vtable[next_sel].ctrl, |
193 | PM_SUSPEND_ON); | |
9dee7a72 MK |
194 | if (ret) { |
195 | dev_err(&rdev->dev, | |
196 | "failed to set control voltage to %duV\n", | |
197 | vctrl->vtable[next_sel].ctrl); | |
198 | goto err; | |
199 | } | |
200 | vctrl->sel = next_sel; | |
201 | ||
202 | delay = DIV_ROUND_UP(vctrl->vtable[vctrl->sel].out - | |
203 | vctrl->vtable[next_sel].out, | |
204 | vctrl->min_slew_down_rate); | |
205 | usleep_range(delay, delay + DIV_ROUND_UP(delay, 10)); | |
206 | } | |
207 | ||
208 | return 0; | |
209 | ||
210 | err: | |
211 | if (vctrl->sel != orig_sel) { | |
212 | /* Try to go back to original voltage */ | |
21e39809 | 213 | if (!regulator_set_voltage_rdev(rdev->supply->rdev, |
e9153311 | 214 | vctrl->vtable[orig_sel].ctrl, |
9dee7a72 | 215 | vctrl->vtable[orig_sel].ctrl, |
e9153311 | 216 | PM_SUSPEND_ON)) |
9dee7a72 MK |
217 | vctrl->sel = orig_sel; |
218 | else | |
219 | dev_warn(&rdev->dev, | |
220 | "failed to restore original voltage\n"); | |
221 | } | |
222 | ||
223 | return ret; | |
224 | } | |
225 | ||
226 | static int vctrl_list_voltage(struct regulator_dev *rdev, | |
227 | unsigned int selector) | |
228 | { | |
229 | struct vctrl_data *vctrl = rdev_get_drvdata(rdev); | |
230 | ||
231 | if (selector >= rdev->desc->n_voltages) | |
232 | return -EINVAL; | |
233 | ||
234 | return vctrl->vtable[selector].out; | |
235 | } | |
236 | ||
237 | static int vctrl_parse_dt(struct platform_device *pdev, | |
238 | struct vctrl_data *vctrl) | |
239 | { | |
240 | int ret; | |
241 | struct device_node *np = pdev->dev.of_node; | |
242 | u32 pval; | |
243 | u32 vrange_ctrl[2]; | |
244 | ||
9dee7a72 MK |
245 | ret = of_property_read_u32(np, "ovp-threshold-percent", &pval); |
246 | if (!ret) { | |
247 | vctrl->ovp_threshold = pval; | |
248 | if (vctrl->ovp_threshold > 100) { | |
249 | dev_err(&pdev->dev, | |
250 | "ovp-threshold-percent (%u) > 100\n", | |
251 | vctrl->ovp_threshold); | |
252 | return -EINVAL; | |
253 | } | |
254 | } | |
255 | ||
256 | ret = of_property_read_u32(np, "min-slew-down-rate", &pval); | |
257 | if (!ret) { | |
258 | vctrl->min_slew_down_rate = pval; | |
259 | ||
260 | /* We use the value as int and as divider; sanity check */ | |
261 | if (vctrl->min_slew_down_rate == 0) { | |
262 | dev_err(&pdev->dev, | |
263 | "min-slew-down-rate must not be 0\n"); | |
264 | return -EINVAL; | |
265 | } else if (vctrl->min_slew_down_rate > INT_MAX) { | |
266 | dev_err(&pdev->dev, "min-slew-down-rate (%u) too big\n", | |
267 | vctrl->min_slew_down_rate); | |
268 | return -EINVAL; | |
269 | } | |
270 | } | |
271 | ||
272 | if (vctrl->ovp_threshold && !vctrl->min_slew_down_rate) { | |
273 | dev_err(&pdev->dev, | |
274 | "ovp-threshold-percent requires min-slew-down-rate\n"); | |
275 | return -EINVAL; | |
276 | } | |
277 | ||
278 | ret = of_property_read_u32(np, "regulator-min-microvolt", &pval); | |
279 | if (ret) { | |
280 | dev_err(&pdev->dev, | |
281 | "failed to read regulator-min-microvolt: %d\n", ret); | |
282 | return ret; | |
283 | } | |
284 | vctrl->vrange.out.min_uV = pval; | |
285 | ||
286 | ret = of_property_read_u32(np, "regulator-max-microvolt", &pval); | |
287 | if (ret) { | |
288 | dev_err(&pdev->dev, | |
289 | "failed to read regulator-max-microvolt: %d\n", ret); | |
290 | return ret; | |
291 | } | |
292 | vctrl->vrange.out.max_uV = pval; | |
293 | ||
294 | ret = of_property_read_u32_array(np, "ctrl-voltage-range", vrange_ctrl, | |
295 | 2); | |
296 | if (ret) { | |
297 | dev_err(&pdev->dev, "failed to read ctrl-voltage-range: %d\n", | |
298 | ret); | |
299 | return ret; | |
300 | } | |
301 | ||
302 | if (vrange_ctrl[0] >= vrange_ctrl[1]) { | |
303 | dev_err(&pdev->dev, "ctrl-voltage-range is invalid: %d-%d\n", | |
304 | vrange_ctrl[0], vrange_ctrl[1]); | |
305 | return -EINVAL; | |
306 | } | |
307 | ||
308 | vctrl->vrange.ctrl.min_uV = vrange_ctrl[0]; | |
309 | vctrl->vrange.ctrl.max_uV = vrange_ctrl[1]; | |
310 | ||
311 | return 0; | |
312 | } | |
313 | ||
314 | static int vctrl_cmp_ctrl_uV(const void *a, const void *b) | |
315 | { | |
316 | const struct vctrl_voltage_table *at = a; | |
317 | const struct vctrl_voltage_table *bt = b; | |
318 | ||
319 | return at->ctrl - bt->ctrl; | |
320 | } | |
321 | ||
21e39809 CYT |
322 | static int vctrl_init_vtable(struct platform_device *pdev, |
323 | struct regulator *ctrl_reg) | |
9dee7a72 MK |
324 | { |
325 | struct vctrl_data *vctrl = platform_get_drvdata(pdev); | |
326 | struct regulator_desc *rdesc = &vctrl->desc; | |
9dee7a72 MK |
327 | struct vctrl_voltage_range *vrange_ctrl = &vctrl->vrange.ctrl; |
328 | int n_voltages; | |
329 | int ctrl_uV; | |
330 | int i, idx_vt; | |
331 | ||
332 | n_voltages = regulator_count_voltages(ctrl_reg); | |
333 | ||
334 | rdesc->n_voltages = n_voltages; | |
335 | ||
336 | /* determine number of steps within the range of the vctrl regulator */ | |
337 | for (i = 0; i < n_voltages; i++) { | |
338 | ctrl_uV = regulator_list_voltage(ctrl_reg, i); | |
339 | ||
340 | if (ctrl_uV < vrange_ctrl->min_uV || | |
9e488c0a | 341 | ctrl_uV > vrange_ctrl->max_uV) |
9dee7a72 | 342 | rdesc->n_voltages--; |
9dee7a72 MK |
343 | } |
344 | ||
345 | if (rdesc->n_voltages == 0) { | |
346 | dev_err(&pdev->dev, "invalid configuration\n"); | |
347 | return -EINVAL; | |
348 | } | |
349 | ||
a9bbb453 AL |
350 | vctrl->vtable = devm_kcalloc(&pdev->dev, rdesc->n_voltages, |
351 | sizeof(struct vctrl_voltage_table), | |
352 | GFP_KERNEL); | |
9dee7a72 MK |
353 | if (!vctrl->vtable) |
354 | return -ENOMEM; | |
355 | ||
356 | /* create mapping control <=> output voltage */ | |
357 | for (i = 0, idx_vt = 0; i < n_voltages; i++) { | |
358 | ctrl_uV = regulator_list_voltage(ctrl_reg, i); | |
359 | ||
360 | if (ctrl_uV < vrange_ctrl->min_uV || | |
361 | ctrl_uV > vrange_ctrl->max_uV) | |
362 | continue; | |
363 | ||
364 | vctrl->vtable[idx_vt].ctrl = ctrl_uV; | |
365 | vctrl->vtable[idx_vt].out = | |
366 | vctrl_calc_output_voltage(vctrl, ctrl_uV); | |
367 | idx_vt++; | |
368 | } | |
369 | ||
370 | /* we rely on the table to be ordered by ascending voltage */ | |
371 | sort(vctrl->vtable, rdesc->n_voltages, | |
372 | sizeof(struct vctrl_voltage_table), vctrl_cmp_ctrl_uV, | |
373 | NULL); | |
374 | ||
375 | /* pre-calculate OVP-safe downward transitions */ | |
a9bbb453 | 376 | for (i = rdesc->n_voltages - 1; i > 0; i--) { |
9dee7a72 MK |
377 | int j; |
378 | int ovp_min_uV = (vctrl->vtable[i].out * | |
379 | (100 - vctrl->ovp_threshold)) / 100; | |
380 | ||
381 | for (j = 0; j < i; j++) { | |
382 | if (vctrl->vtable[j].out >= ovp_min_uV) { | |
383 | vctrl->vtable[i].ovp_min_sel = j; | |
384 | break; | |
385 | } | |
386 | } | |
387 | ||
388 | if (j == i) { | |
389 | dev_warn(&pdev->dev, "switching down from %duV may cause OVP shutdown\n", | |
390 | vctrl->vtable[i].out); | |
391 | /* use next lowest voltage */ | |
392 | vctrl->vtable[i].ovp_min_sel = i - 1; | |
393 | } | |
394 | } | |
395 | ||
396 | return 0; | |
397 | } | |
398 | ||
399 | static int vctrl_enable(struct regulator_dev *rdev) | |
400 | { | |
401 | struct vctrl_data *vctrl = rdev_get_drvdata(rdev); | |
9dee7a72 | 402 | |
21e39809 | 403 | vctrl->enabled = true; |
9dee7a72 | 404 | |
21e39809 | 405 | return 0; |
9dee7a72 MK |
406 | } |
407 | ||
408 | static int vctrl_disable(struct regulator_dev *rdev) | |
409 | { | |
410 | struct vctrl_data *vctrl = rdev_get_drvdata(rdev); | |
9dee7a72 | 411 | |
21e39809 | 412 | vctrl->enabled = false; |
9dee7a72 | 413 | |
21e39809 | 414 | return 0; |
9dee7a72 MK |
415 | } |
416 | ||
417 | static int vctrl_is_enabled(struct regulator_dev *rdev) | |
418 | { | |
419 | struct vctrl_data *vctrl = rdev_get_drvdata(rdev); | |
420 | ||
421 | return vctrl->enabled; | |
422 | } | |
423 | ||
424 | static const struct regulator_ops vctrl_ops_cont = { | |
425 | .enable = vctrl_enable, | |
426 | .disable = vctrl_disable, | |
427 | .is_enabled = vctrl_is_enabled, | |
428 | .get_voltage = vctrl_get_voltage, | |
429 | .set_voltage = vctrl_set_voltage, | |
430 | }; | |
431 | ||
432 | static const struct regulator_ops vctrl_ops_non_cont = { | |
433 | .enable = vctrl_enable, | |
434 | .disable = vctrl_disable, | |
435 | .is_enabled = vctrl_is_enabled, | |
436 | .set_voltage_sel = vctrl_set_voltage_sel, | |
437 | .get_voltage_sel = vctrl_get_voltage_sel, | |
438 | .list_voltage = vctrl_list_voltage, | |
439 | .map_voltage = regulator_map_voltage_iterate, | |
440 | }; | |
441 | ||
442 | static int vctrl_probe(struct platform_device *pdev) | |
443 | { | |
444 | struct device_node *np = pdev->dev.of_node; | |
445 | struct vctrl_data *vctrl; | |
446 | const struct regulator_init_data *init_data; | |
447 | struct regulator_desc *rdesc; | |
448 | struct regulator_config cfg = { }; | |
449 | struct vctrl_voltage_range *vrange_ctrl; | |
21e39809 | 450 | struct regulator *ctrl_reg; |
9dee7a72 MK |
451 | int ctrl_uV; |
452 | int ret; | |
453 | ||
454 | vctrl = devm_kzalloc(&pdev->dev, sizeof(struct vctrl_data), | |
455 | GFP_KERNEL); | |
456 | if (!vctrl) | |
457 | return -ENOMEM; | |
458 | ||
459 | platform_set_drvdata(pdev, vctrl); | |
460 | ||
461 | ret = vctrl_parse_dt(pdev, vctrl); | |
462 | if (ret) | |
463 | return ret; | |
464 | ||
21e39809 CYT |
465 | ctrl_reg = devm_regulator_get(&pdev->dev, "ctrl"); |
466 | if (IS_ERR(ctrl_reg)) | |
467 | return PTR_ERR(ctrl_reg); | |
468 | ||
9dee7a72 MK |
469 | vrange_ctrl = &vctrl->vrange.ctrl; |
470 | ||
471 | rdesc = &vctrl->desc; | |
472 | rdesc->name = "vctrl"; | |
473 | rdesc->type = REGULATOR_VOLTAGE; | |
474 | rdesc->owner = THIS_MODULE; | |
21e39809 | 475 | rdesc->supply_name = "ctrl"; |
9dee7a72 | 476 | |
21e39809 CYT |
477 | if ((regulator_get_linear_step(ctrl_reg) == 1) || |
478 | (regulator_count_voltages(ctrl_reg) == -EINVAL)) { | |
9dee7a72 MK |
479 | rdesc->continuous_voltage_range = true; |
480 | rdesc->ops = &vctrl_ops_cont; | |
481 | } else { | |
482 | rdesc->ops = &vctrl_ops_non_cont; | |
483 | } | |
484 | ||
485 | init_data = of_get_regulator_init_data(&pdev->dev, np, rdesc); | |
486 | if (!init_data) | |
487 | return -ENOMEM; | |
488 | ||
489 | cfg.of_node = np; | |
490 | cfg.dev = &pdev->dev; | |
491 | cfg.driver_data = vctrl; | |
492 | cfg.init_data = init_data; | |
493 | ||
494 | if (!rdesc->continuous_voltage_range) { | |
21e39809 | 495 | ret = vctrl_init_vtable(pdev, ctrl_reg); |
9dee7a72 MK |
496 | if (ret) |
497 | return ret; | |
498 | ||
98e47570 | 499 | /* Use locked consumer API when not in regulator framework */ |
21e39809 | 500 | ctrl_uV = regulator_get_voltage(ctrl_reg); |
9dee7a72 MK |
501 | if (ctrl_uV < 0) { |
502 | dev_err(&pdev->dev, "failed to get control voltage\n"); | |
503 | return ctrl_uV; | |
504 | } | |
505 | ||
506 | /* determine current voltage selector from control voltage */ | |
507 | if (ctrl_uV < vrange_ctrl->min_uV) { | |
508 | vctrl->sel = 0; | |
509 | } else if (ctrl_uV > vrange_ctrl->max_uV) { | |
510 | vctrl->sel = rdesc->n_voltages - 1; | |
511 | } else { | |
512 | int i; | |
513 | ||
514 | for (i = 0; i < rdesc->n_voltages; i++) { | |
515 | if (ctrl_uV == vctrl->vtable[i].ctrl) { | |
516 | vctrl->sel = i; | |
517 | break; | |
518 | } | |
519 | } | |
520 | } | |
521 | } | |
522 | ||
21e39809 CYT |
523 | /* Drop ctrl-supply here in favor of regulator core managed supply */ |
524 | devm_regulator_put(ctrl_reg); | |
525 | ||
9dee7a72 MK |
526 | vctrl->rdev = devm_regulator_register(&pdev->dev, rdesc, &cfg); |
527 | if (IS_ERR(vctrl->rdev)) { | |
528 | ret = PTR_ERR(vctrl->rdev); | |
529 | dev_err(&pdev->dev, "failed to register regulator: %d\n", ret); | |
530 | return ret; | |
531 | } | |
532 | ||
533 | return 0; | |
534 | } | |
535 | ||
536 | static const struct of_device_id vctrl_of_match[] = { | |
537 | { .compatible = "vctrl-regulator", }, | |
538 | {}, | |
539 | }; | |
540 | MODULE_DEVICE_TABLE(of, vctrl_of_match); | |
541 | ||
542 | static struct platform_driver vctrl_driver = { | |
543 | .probe = vctrl_probe, | |
544 | .driver = { | |
545 | .name = "vctrl-regulator", | |
259b93b2 | 546 | .probe_type = PROBE_PREFER_ASYNCHRONOUS, |
9dee7a72 MK |
547 | .of_match_table = of_match_ptr(vctrl_of_match), |
548 | }, | |
549 | }; | |
550 | ||
551 | module_platform_driver(vctrl_driver); | |
552 | ||
553 | MODULE_DESCRIPTION("Voltage Controlled Regulator Driver"); | |
554 | MODULE_AUTHOR("Matthias Kaehlcke <mka@chromium.org>"); | |
555 | MODULE_LICENSE("GPL v2"); |