1 /* 2 * Copyright (C) 2015 Google, Inc 3 * Written by Simon Glass <sjg@chromium.org> 4 * 5 * SPDX-License-Identifier: GPL-2.0+ 6 */ 7 8 #include <common.h> 9 #include <dm.h> 10 #include <errno.h> 11 #include <power/rk8xx_pmic.h> 12 #include <power/pmic.h> 13 14 DECLARE_GLOBAL_DATA_PTR; 15 16 static const struct pmic_child_info pmic_children_info[] = { 17 { .prefix = "DCDC_REG", .driver = "rk8xx_buck"}, 18 { .prefix = "LDO_REG", .driver = "rk8xx_ldo"}, 19 { .prefix = "SWITCH_REG", .driver = "rk8xx_switch"}, 20 { }, 21 }; 22 23 static int rk8xx_reg_count(struct udevice *dev) 24 { 25 return RK808_NUM_OF_REGS; 26 } 27 28 static int rk8xx_write(struct udevice *dev, uint reg, const uint8_t *buff, 29 int len) 30 { 31 int ret; 32 33 ret = dm_i2c_write(dev, reg, buff, len); 34 if (ret) { 35 debug("write error to device: %p register: %#x!", dev, reg); 36 return ret; 37 } 38 39 return 0; 40 } 41 42 static int rk8xx_read(struct udevice *dev, uint reg, uint8_t *buff, int len) 43 { 44 int ret; 45 46 ret = dm_i2c_read(dev, reg, buff, len); 47 if (ret) { 48 debug("read error from device: %p register: %#x!", dev, reg); 49 return ret; 50 } 51 52 return 0; 53 } 54 55 #if CONFIG_IS_ENABLED(PMIC_CHILDREN) 56 static int rk8xx_bind(struct udevice *dev) 57 { 58 ofnode regulators_node; 59 int children; 60 61 regulators_node = dev_read_subnode(dev, "regulators"); 62 if (!ofnode_valid(regulators_node)) { 63 debug("%s: %s regulators subnode not found!", __func__, 64 dev->name); 65 return -ENXIO; 66 } 67 68 debug("%s: '%s' - found regulators subnode\n", __func__, dev->name); 69 70 children = pmic_bind_children(dev, regulators_node, pmic_children_info); 71 if (!children) 72 debug("%s: %s - no child found\n", __func__, dev->name); 73 74 /* Always return success for this device */ 75 return 0; 76 } 77 #endif 78 79 static int rk8xx_probe(struct udevice *dev) 80 { 81 struct rk8xx_priv *priv = dev_get_priv(dev); 82 uint8_t msb, lsb; 83 84 /* read Chip variant */ 85 rk8xx_read(dev, ID_MSB, &msb, 1); 86 rk8xx_read(dev, ID_LSB, &lsb, 1); 87 88 priv->variant = ((msb << 8) | lsb) & RK8XX_ID_MSK; 89 90 return 0; 91 } 92 93 static struct dm_pmic_ops rk8xx_ops = { 94 .reg_count = rk8xx_reg_count, 95 .read = rk8xx_read, 96 .write = rk8xx_write, 97 }; 98 99 static const struct udevice_id rk8xx_ids[] = { 100 { .compatible = "rockchip,rk808" }, 101 { .compatible = "rockchip,rk818" }, 102 { } 103 }; 104 105 U_BOOT_DRIVER(pmic_rk8xx) = { 106 .name = "rk8xx pmic", 107 .id = UCLASS_PMIC, 108 .of_match = rk8xx_ids, 109 #if CONFIG_IS_ENABLED(PMIC_CHILDREN) 110 .bind = rk8xx_bind, 111 #endif 112 .priv_auto_alloc_size = sizeof(struct rk8xx_priv), 113 .probe = rk8xx_probe, 114 .ops = &rk8xx_ops, 115 }; 116