drivers/sysreset/sysreset_max77663.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  *  Copyright(C) 2023 Svyatoslav Ryhel <[email protected]>
   4  */
   5
   6 #include <dm.h>
   7 #include <i2c.h>
   8 #include <errno.h>
   9 #include <sysreset.h>
  10 #include <power/pmic.h>
  11 #include <power/max77663.h>
  12
  13 static int max77663_sysreset_request(struct udevice *dev,
  14                                      enum sysreset_t type)
  15 {
  16         int val;
  17
  18         val = pmic_reg_read(dev->parent, MAX77663_REG_ONOFF_CFG1);
  19         if (val < 0)
  20                 return val;
  21
  22         /* clear both bits */
  23         val &= ~ONOFF_SFT_RST;
  24         val &= ~ONOFF_PWR_OFF;
  25
  26         switch (type) {
  27         case SYSRESET_POWER:
  28                 /* MAX77663: SFT_RST > ONOFF_CFG1 */
  29                 pmic_reg_write(dev->parent, MAX77663_REG_ONOFF_CFG1,
  30                                val | ONOFF_SFT_RST);
  31                 break;
  32         case SYSRESET_POWER_OFF:
  33                 /* MAX77663: PWR_OFF > ONOFF_CFG1 */
  34                 pmic_reg_write(dev->parent, MAX77663_REG_ONOFF_CFG1,
  35                                val | ONOFF_PWR_OFF);
  36                 break;
  37         default:
  38                 return -EPROTONOSUPPORT;
  39         }
  40
  41         return -EINPROGRESS;
  42 }
  43
  44 static struct sysreset_ops max77663_sysreset = {
  45         .request = max77663_sysreset_request,
  46 };
  47
  48 U_BOOT_DRIVER(sysreset_max77663) = {
  49         .id     = UCLASS_SYSRESET,
  50         .name   = MAX77663_RST_DRIVER,
  51         .ops    = &max77663_sysreset,
  52 };