1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * (C) Copyright 2015 4 * Dirk Eibach, Guntermann & Drunck GmbH, dirk.eibach@gdsys.cc 5 */ 6 7 #include <common.h> 8 #include <i2c.h> 9 10 enum { 11 FAN_CONFIG = 0x03, 12 FAN_TACHLIM_LSB = 0x48, 13 FAN_TACHLIM_MSB = 0x49, 14 FAN_PWM_FREQ = 0x4D, 15 }; 16 17 void init_fan_controller(u8 addr) 18 { 19 int val; 20 21 /* set PWM Frequency to 2.5% resolution */ 22 i2c_reg_write(addr, FAN_PWM_FREQ, 20); 23 24 /* set Tachometer Limit */ 25 i2c_reg_write(addr, FAN_TACHLIM_LSB, 0x10); 26 i2c_reg_write(addr, FAN_TACHLIM_MSB, 0x0a); 27 28 /* enable Tach input */ 29 val = i2c_reg_read(addr, FAN_CONFIG) | 0x04; 30 i2c_reg_write(addr, FAN_CONFIG, val); 31 } 32