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board/freescale/vid: enables writes to all commands for LTC3882

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Enable writes to all commands for LTC3882

Signed-off-by: Biwen Li <biwen.li@nxp.com>
Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>
This commit is contained in:
Biwen Li 2020-10-12 20:07:35 +08:00 • committed by Priyanka Jain
parent f3555bd285
commit 026703174a
2 changed files with 58 additions and 3 deletions
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42
board/freescale/common/vid.c
View file

@ -379,6 +379,7 @@ static int set_voltage_to_LTC(int i2caddress, int vdd)
{
int ret, vdd_last, vdd_target = vdd;
int count = 100, temp = 0;
unsigned char value;
/* Scale up to the LTC resolution is 1/4096V */
vdd = (vdd * 4096) / 1000;
@ -391,16 +392,51 @@ static int set_voltage_to_LTC(int i2caddress, int vdd)
/* Write the desired voltage code to the regulator */
#ifndef CONFIG_DM_I2C
/* Check write protect state */
ret = i2c_read(I2C_VOL_MONITOR_ADDR,
PMBUS_CMD_WRITE_PROTECT, 1,
(void *)&value, sizeof(value));
if (ret)
goto exit;
if (value != EN_WRITE_ALL_CMD) {
value = EN_WRITE_ALL_CMD;
ret = i2c_write(I2C_VOL_MONITOR_ADDR,
PMBUS_CMD_WRITE_PROTECT, 1,
(void *)&value, sizeof(value));
if (ret)
goto exit;
}
ret = i2c_write(I2C_VOL_MONITOR_ADDR,
PMBUS_CMD_PAGE_PLUS_WRITE, 1, (void *)&buff, 5);
PMBUS_CMD_PAGE_PLUS_WRITE, 1,
(void *)&buff, sizeof(buff));
#else
struct udevice *dev;
ret = i2c_get_chip_for_busnum(0, I2C_VOL_MONITOR_ADDR, 1, &dev);
if (!ret)
if (!ret) {
/* Check write protect state */
ret = dm_i2c_read(dev,
PMBUS_CMD_WRITE_PROTECT,
(void *)&value, sizeof(value));
if (ret)
goto exit;
if (value != EN_WRITE_ALL_CMD) {
value = EN_WRITE_ALL_CMD;
ret = dm_i2c_write(dev,
PMBUS_CMD_WRITE_PROTECT,
(void *)&value, sizeof(value));
if (ret)
goto exit;
}
ret = dm_i2c_write(dev, PMBUS_CMD_PAGE_PLUS_WRITE,
(void *)&buff, 5);
(void *)&buff, sizeof(buff));
}
#endif
exit:
if (ret) {
printf("VID: I2C failed to write to the volatge regulator\n");
return -1;

19
board/freescale/common/vid.h
View file

@ -18,6 +18,25 @@
/* step the IR regulator in 5mV increments */
#define IR_VDD_STEP_DOWN 5
#define IR_VDD_STEP_UP 5
/* LTC3882 */
#define PMBUS_CMD_WRITE_PROTECT 0x10
/*
* WRITE_PROTECT command supported values
* 0x80: Disable all writes except WRITE_PROTECT, PAGE,
* STORE_USER_ALL and MFR_EE_UNLOCK commands.
* 0x40: Disable all writes except WRITE_PROTECT, PAGE, STORE_USER_ALL,
* MFR_EE_UNLOCK, OPERATION, CLEAR_PEAKS and CLEAR_FAULTS commands.
* Individual faults can also be cleared by writing a 1 to the
* respective status bit.
* 0x20: Disable all writes except WRITE_PROTECT, PAGE, STORE_USER_ ALL,
* MFR_EE_UNLOCK, OPERATION, CLEAR_PEAKS, CLEAR_FAULTS, ON_OFF_CONFIG
* and VOUT_COMMAND commands. Individual faults can be cleared by
* writing a 1 to the respective status bit.
* 0x00: Enables write to all commands
*/
#define EN_WRITE_ALL_CMD (0)
int adjust_vdd(ulong vdd_override);
#endif /* __VID_H_ */