pmic.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#include <console/console.h>
#include <delay.h>
#include <device/i2c_simple.h>
#include <reset.h>
#include <stdint.h>
 
#include "pmic.h"
 
enum {
        MAX77620_I2C_ADDR = 0x3c
};
 
struct max77620_init_reg {
        u8 reg;
        u8 val;
        u8 delay;
};
 
static void pmic_write_reg(unsigned int bus, uint8_t reg, uint8_t val, int delay)
{
        if (i2c_writeb(bus, MAX77620_I2C_ADDR, reg, val)) {
                printk(BIOS_ERR, "%s: reg = 0x%02X, value = 0x%02X failed!\n",
                        __func__, reg, val);
                /* Reset the board on any PMIC write error */
                board_reset();
        } else {
                if (delay)
                        udelay(500);
        }
}
 
void pmic_init(unsigned int bus)
{
        /* Setup/Enable GPIO5 - VDD_CPU_REG_EN */
        pmic_write_reg(bus, MAX77620_GPIO5_REG, 0x09, 1);
 
        /* Setup/Enable GPIO1 - VDD_HDMI_5V0_BST_EN -- ??? */
        pmic_write_reg(bus, MAX77620_GPIO1_REG, 0x09, 1);
 
        /* GPIO 0,1,5,6,7 = GPIO, 2,3,4 = alt mode */
        pmic_write_reg(bus, MAX77620_AME_GPIO, 0x1c, 1);
 
        /* Disable SD1 Remote Sense, Set SD1 for LPDDR4 to 1.125v? */
        pmic_write_reg(bus, MAX77620_CNFG2SD_REG, 0x04, 1);
 
        pmic_write_reg(bus, MAX77620_SD1_REG, 0x2a, 1);
 
        /* CNFG1_L2 = 0xF2 for 3.3v, enabled */
        pmic_write_reg(bus, MAX77620_CNFG1_L2_REG, 0xf2, 1);
 
        /* CNFG1_L1 = 0xCA for 1.05v, enabled */
        pmic_write_reg(bus, MAX77620_CNFG1_L1_REG, 0xca, 1);
 
        printk(BIOS_DEBUG, "PMIC init done\n");
}