1 /* 2 * Copyright (C) 2015 Google, Inc 3 * 4 * SPDX-License-Identifier: GPL-2.0+ 5 */ 6 7 #include <common.h> 8 #include <fdtdec.h> 9 #include <errno.h> 10 #include <dm.h> 11 #include <i2c.h> 12 #include <power/pmic.h> 13 #include <power/regulator.h> 14 #include <power/s5m8767.h> 15 16 static const struct pmic_child_info pmic_children_info[] = { 17 { .prefix = "LDO", .driver = S5M8767_LDO_DRIVER }, 18 { .prefix = "BUCK", .driver = S5M8767_BUCK_DRIVER }, 19 { }, 20 }; 21 22 static int s5m8767_reg_count(struct udevice *dev) 23 { 24 return S5M8767_NUM_OF_REGS; 25 } 26 27 static int s5m8767_write(struct udevice *dev, uint reg, const uint8_t *buff, 28 int len) 29 { 30 if (dm_i2c_write(dev, reg, buff, len)) { 31 pr_err("write error to device: %p register: %#x!", dev, reg); 32 return -EIO; 33 } 34 35 return 0; 36 } 37 38 static int s5m8767_read(struct udevice *dev, uint reg, uint8_t *buff, int len) 39 { 40 if (dm_i2c_read(dev, reg, buff, len)) { 41 pr_err("read error from device: %p register: %#x!", dev, reg); 42 return -EIO; 43 } 44 45 return 0; 46 } 47 48 int s5m8767_enable_32khz_cp(struct udevice *dev) 49 { 50 return pmic_clrsetbits(dev, S5M8767_EN32KHZ_CP, 0, 1 << 1); 51 } 52 53 static int s5m8767_bind(struct udevice *dev) 54 { 55 int children; 56 ofnode node; 57 58 node = dev_read_subnode(dev, "regulators"); 59 if (!ofnode_valid(node)) { 60 debug("%s: %s regulators subnode not found!", __func__, 61 dev->name); 62 return -ENXIO; 63 } 64 65 debug("%s: '%s' - found regulators subnode\n", __func__, dev->name); 66 67 children = pmic_bind_children(dev, node, pmic_children_info); 68 if (!children) 69 debug("%s: %s - no child found\n", __func__, dev->name); 70 71 /* Always return success for this device */ 72 return 0; 73 } 74 75 static struct dm_pmic_ops s5m8767_ops = { 76 .reg_count = s5m8767_reg_count, 77 .read = s5m8767_read, 78 .write = s5m8767_write, 79 }; 80 81 static const struct udevice_id s5m8767_ids[] = { 82 { .compatible = "samsung,s5m8767-pmic" }, 83 { } 84 }; 85 86 U_BOOT_DRIVER(pmic_s5m8767) = { 87 .name = "s5m8767_pmic", 88 .id = UCLASS_PMIC, 89 .of_match = s5m8767_ids, 90 .bind = s5m8767_bind, 91 .ops = &s5m8767_ops, 92 }; 93