max77686.c 2.0 KB

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  1. // SPDX-License-Identifier: GPL-2.0+
  2. /*
  3. * Copyright (C) 2014-2015 Samsung Electronics
  4. * Przemyslaw Marczak <p.marczak@samsung.com>
  5. */
  6. #include <common.h>
  7. #include <fdtdec.h>
  8. #include <errno.h>
  9. #include <dm.h>
  10. #include <i2c.h>
  11. #include <log.h>
  12. #include <power/pmic.h>
  13. #include <power/regulator.h>
  14. #include <power/max77686_pmic.h>
  15. static const struct pmic_child_info pmic_children_info[] = {
  16. { .prefix = "LDO", .driver = MAX77686_LDO_DRIVER },
  17. { .prefix = "BUCK", .driver = MAX77686_BUCK_DRIVER },
  18. { },
  19. };
  20. static int max77686_reg_count(struct udevice *dev)
  21. {
  22. return MAX77686_NUM_OF_REGS;
  23. }
  24. static int max77686_write(struct udevice *dev, uint reg, const uint8_t *buff,
  25. int len)
  26. {
  27. if (dm_i2c_write(dev, reg, buff, len)) {
  28. pr_err("write error to device: %p register: %#x!\n", dev, reg);
  29. return -EIO;
  30. }
  31. return 0;
  32. }
  33. static int max77686_read(struct udevice *dev, uint reg, uint8_t *buff, int len)
  34. {
  35. if (dm_i2c_read(dev, reg, buff, len)) {
  36. pr_err("read error from device: %p register: %#x!\n", dev, reg);
  37. return -EIO;
  38. }
  39. return 0;
  40. }
  41. static int max77686_bind(struct udevice *dev)
  42. {
  43. ofnode regulators_node;
  44. int children;
  45. regulators_node = dev_read_subnode(dev, "voltage-regulators");
  46. if (!ofnode_valid(regulators_node)) {
  47. debug("%s: %s regulators subnode not found!\n", __func__,
  48. dev->name);
  49. return -ENXIO;
  50. }
  51. debug("%s: '%s' - found regulators subnode\n", __func__, dev->name);
  52. children = pmic_bind_children(dev, regulators_node, pmic_children_info);
  53. if (!children)
  54. debug("%s: %s - no child found\n", __func__, dev->name);
  55. /* Always return success for this device */
  56. return 0;
  57. }
  58. static struct dm_pmic_ops max77686_ops = {
  59. .reg_count = max77686_reg_count,
  60. .read = max77686_read,
  61. .write = max77686_write,
  62. };
  63. static const struct udevice_id max77686_ids[] = {
  64. { .compatible = "maxim,max77686" },
  65. { }
  66. };
  67. U_BOOT_DRIVER(pmic_max77686) = {
  68. .name = "max77686_pmic",
  69. .id = UCLASS_PMIC,
  70. .of_match = max77686_ids,
  71. .bind = max77686_bind,
  72. .ops = &max77686_ops,
  73. };