1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * (C) Copyright 2022 Rockchip Electronics Co., Ltd 4 */ 5 6 #include <asm-generic/gpio.h> 7 #include <common.h> 8 #include <dm.h> 9 #include <errno.h> 10 #include <i2c.h> 11 #include <max96745.h> 12 13 struct max96745_priv { 14 struct udevice *dev; 15 struct gpio_desc enable_gpio; 16 }; 17 18 static int max96745_select(struct udevice *mux, struct udevice *bus, 19 uint channel) 20 { 21 if (channel == 1) 22 dm_i2c_reg_clrset(mux, 0x0086, DIS_REM_CC, 23 FIELD_PREP(DIS_REM_CC, 0)); 24 else 25 dm_i2c_reg_clrset(mux, 0x0076, DIS_REM_CC, 26 FIELD_PREP(DIS_REM_CC, 0)); 27 28 return 0; 29 } 30 31 static int max96745_deselect(struct udevice *mux, struct udevice *bus, 32 uint channel) 33 { 34 if (channel == 1) 35 dm_i2c_reg_clrset(mux, 0x0086, DIS_REM_CC, 36 FIELD_PREP(DIS_REM_CC, 1)); 37 else 38 dm_i2c_reg_clrset(mux, 0x0076, DIS_REM_CC, 39 FIELD_PREP(DIS_REM_CC, 1)); 40 41 return 0; 42 } 43 44 static const struct i2c_mux_ops max96745_ops = { 45 .select = max96745_select, 46 .deselect = max96745_deselect, 47 }; 48 49 static int max96745_power_on(struct max96745_priv *priv) 50 { 51 int ret; 52 53 if (dm_gpio_is_valid(&priv->enable_gpio)) { 54 dm_gpio_set_value(&priv->enable_gpio, 1); 55 mdelay(100); 56 } 57 58 ret = dm_i2c_reg_clrset(priv->dev, 0x0010, RESET_ALL, 59 FIELD_PREP(RESET_ALL, 1)); 60 if (ret < 0) 61 return ret; 62 63 mdelay(100); 64 65 return 0; 66 } 67 68 static int max96745_probe(struct udevice *dev) 69 { 70 struct max96745_priv *priv = dev_get_priv(dev); 71 int ret; 72 73 ret = i2c_set_chip_offset_len(dev, 2); 74 if (ret) 75 return ret; 76 77 priv->dev = dev; 78 79 ret = gpio_request_by_name(dev, "enable-gpios", 0, 80 &priv->enable_gpio, GPIOD_IS_OUT); 81 if (ret && ret != -ENOENT) { 82 dev_err(dev, "%s: failed to get enable GPIO: %d\n", __func__, ret); 83 return ret; 84 } 85 86 ret = max96745_power_on(priv); 87 if (ret) { 88 dev_err(dev, "%s: failed to power on: %d\n", __func__, ret); 89 return ret; 90 } 91 92 dm_i2c_reg_clrset(dev, 0x0076, DIS_REM_CC, FIELD_PREP(DIS_REM_CC, 1)); 93 dm_i2c_reg_clrset(dev, 0x0086, DIS_REM_CC, FIELD_PREP(DIS_REM_CC, 1)); 94 95 return 0; 96 } 97 98 static const struct udevice_id max96745_of_match[] = { 99 { .compatible = "maxim,max96745" }, 100 {} 101 }; 102 103 U_BOOT_DRIVER(max96745) = { 104 .name = "max96745", 105 .id = UCLASS_I2C_MUX, 106 .of_match = max96745_of_match, 107 .bind = dm_scan_fdt_dev, 108 .probe = max96745_probe, 109 .ops = &max96745_ops, 110 .priv_auto_alloc_size = sizeof(struct max96745_priv), 111 }; 112