1// SPDX-License-Identifier: GPL-2.0+ 2/* 3 * Copyright (C) 2018 4 * Lukasz Majewski, DENX Software Engineering, lukma@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 <asm/global_data.h> 14#include <power/pmic.h> 15 16DECLARE_GLOBAL_DATA_PTR; 17 18static int mc34708_reg_count(struct udevice *dev) 19{ 20 return PMIC_NUM_OF_REGS; 21} 22 23static int mc34708_write(struct udevice *dev, uint reg, const u8 *buff, 24 int len) 25{ 26 u8 buf[3] = { 0 }; 27 int ret; 28 29 if (len != MC34708_TRANSFER_SIZE) 30 return -EINVAL; 31 32 /* 33 * The MC34708 sends data with big endian format, hence we need to 34 * perform manual byte swap. 35 */ 36 buf[0] = buff[2]; 37 buf[1] = buff[1]; 38 buf[2] = buff[0]; 39 40 ret = dm_i2c_write(dev, reg, buf, len); 41 if (ret) 42 printf("write error to device: %p register: %#x!\n", dev, reg); 43 44 return ret; 45} 46 47static int mc34708_read(struct udevice *dev, uint reg, u8 *buff, int len) 48{ 49 u8 buf[3] = { 0 }; 50 int ret; 51 52 if (len != MC34708_TRANSFER_SIZE) 53 return -EINVAL; 54 55 ret = dm_i2c_read(dev, reg, buf, len); 56 if (ret) 57 printf("read error from device: %p register: %#x!\n", dev, reg); 58 59 buff[0] = buf[2]; 60 buff[1] = buf[1]; 61 buff[2] = buf[0]; 62 63 return ret; 64} 65 66static int mc34708_probe(struct udevice *dev) 67{ 68 struct uc_pmic_priv *priv = dev_get_uclass_priv(dev); 69 70 priv->trans_len = MC34708_TRANSFER_SIZE; 71 72 /* 73 * Handle PMIC Errata 37: APS mode not fully functional, 74 * use explicit PWM or PFM instead 75 */ 76 pmic_clrsetbits(dev, MC34708_REG_SW12_OPMODE, 77 MC34708_SW1AMODE_MASK | MC34708_SW2MODE_MASK, 78 SW_MODE_PWMPWM | (SW_MODE_PWMPWM << 14u)); 79 80 pmic_clrsetbits(dev, MC34708_REG_SW345_OPMODE, 81 MC34708_SW3MODE_MASK | MC34708_SW4AMODE_MASK | 82 MC34708_SW4BMODE_MASK | MC34708_SW5MODE_MASK, 83 SW_MODE_PWMPWM | (SW_MODE_PWMPWM << 6u) | 84 (SW_MODE_PWMPWM << 12u) | (SW_MODE_PWMPWM << 18u)); 85 86 return 0; 87} 88 89static struct dm_pmic_ops mc34708_ops = { 90 .reg_count = mc34708_reg_count, 91 .read = mc34708_read, 92 .write = mc34708_write, 93}; 94 95static const struct udevice_id mc34708_ids[] = { 96 { .compatible = "fsl,mc34708" }, 97 { } 98}; 99 100U_BOOT_DRIVER(pmic_mc34708) = { 101 .name = "mc34708_pmic", 102 .id = UCLASS_PMIC, 103 .of_match = mc34708_ids, 104 .probe = mc34708_probe, 105 .ops = &mc34708_ops, 106}; 107