1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Copyright (C) 2018 4 * Lukasz Majewski, DENX Software Engineering, lukma (at) denx.de 5 * 6 */ 7 8 #include <common.h> 9 #include <dm.h> 10 #include <errno.h> 11 #include <fsl_pmic.h> 12 #include <i2c.h> 13 #include <power/pmic.h> 14 15 DECLARE_GLOBAL_DATA_PTR; 16 17 static int mc34708_reg_count(struct udevice *dev) 18 { 19 return PMIC_NUM_OF_REGS; 20 } 21 22 static int mc34708_write(struct udevice *dev, uint reg, const u8 *buff, 23 int len) 24 { 25 u8 buf[3] = { 0 }; 26 int ret; 27 28 if (len != MC34708_TRANSFER_SIZE) 29 return -EINVAL; 30 31 /* 32 * The MC34708 sends data with big endian format, hence we need to 33 * perform manual byte swap. 34 */ 35 buf[0] = buff[2]; 36 buf[1] = buff[1]; 37 buf[2] = buff[0]; 38 39 ret = dm_i2c_write(dev, reg, buf, len); 40 if (ret) 41 printf("write error to device: %p register: %#x!", dev, reg); 42 43 return ret; 44 } 45 46 static int mc34708_read(struct udevice *dev, uint reg, u8 *buff, int len) 47 { 48 u8 buf[3] = { 0 }; 49 int ret; 50 51 if (len != MC34708_TRANSFER_SIZE) 52 return -EINVAL; 53 54 ret = dm_i2c_read(dev, reg, buf, len); 55 if (ret) 56 printf("read error from device: %p register: %#x!", dev, reg); 57 58 buff[0] = buf[2]; 59 buff[1] = buf[1]; 60 buff[2] = buf[0]; 61 62 return ret; 63 } 64 65 static int mc34708_probe(struct udevice *dev) 66 { 67 struct uc_pmic_priv *priv = dev_get_uclass_priv(dev); 68 69 priv->trans_len = MC34708_TRANSFER_SIZE; 70 71 /* 72 * Handle PMIC Errata 37: APS mode not fully functional, 73 * use explicit PWM or PFM instead 74 */ 75 pmic_clrsetbits(dev, MC34708_REG_SW12_OPMODE, 76 MC34708_SW1AMODE_MASK | MC34708_SW2MODE_MASK, 77 SW_MODE_PWMPWM | (SW_MODE_PWMPWM << 14u)); 78 79 pmic_clrsetbits(dev, MC34708_REG_SW345_OPMODE, 80 MC34708_SW3MODE_MASK | MC34708_SW4AMODE_MASK | 81 MC34708_SW4BMODE_MASK | MC34708_SW5MODE_MASK, 82 SW_MODE_PWMPWM | (SW_MODE_PWMPWM << 6u) | 83 (SW_MODE_PWMPWM << 12u) | (SW_MODE_PWMPWM << 18u)); 84 85 return 0; 86 } 87 88 static struct dm_pmic_ops mc34708_ops = { 89 .reg_count = mc34708_reg_count, 90 .read = mc34708_read, 91 .write = mc34708_write, 92 }; 93 94 static const struct udevice_id mc34708_ids[] = { 95 { .compatible = "fsl,mc34708" }, 96 { } 97 }; 98 99 U_BOOT_DRIVER(pmic_mc34708) = { 100 .name = "mc34708_pmic", 101 .id = UCLASS_PMIC, 102 .of_match = mc34708_ids, 103 .probe = mc34708_probe, 104 .ops = &mc34708_ops, 105 }; 106
