i.MX ProcessorsのトピックRe: Ho to modify code when change pmu?

Ho to modify code when change pmu?

mingmingyuan — Fri, 02 Oct 2015 05:05:09 GMT

we change pmu from MMPF0100F0EP to MMPF0100F4AEP, now i2c can't work，so we can't config pmu, log as below:

In: serial

Out: serial

Err: serial

i2c_addr:chip address cycle fail(a1)

i2c_addr failed

Read device ID error!

Net: got MAC address from IIM: 00:00:00:00:00:00

FEC0 [PRIME]

Hit any key to stop autoboot: 0

kernel @ 10808000 (4738520)

board：sambaSD

system：android4.4

Re: Ho to modify code when change pmu?

igorpadykov — Fri, 02 Oct 2015 06:51:34 GMT

Hi mingming

please modify function setup_pmic_voltages in uboot board file, like

.../board/freescale/../mx6sabresd.c

Also it may be useful to check Chapter 23 PF100 Regulator Driver

attached Linux Manual.

Best regards

igor

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Re: Ho to modify code when change pmu?

mingmingyuan — Fri, 02 Oct 2015 13:38:19 GMT

when read device ID in uboot , it failed, I also check the i2c addr of new pmu, it also is 0x8, so when we change pmu ,we needn't change uboot code, right?

static int setup_pmic_voltages(void)

{

unsigned char value, rev_id = 0 ;

i2c_init(CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE);

if (!i2c_probe(0x8)) {

if (i2c_read(0x8, 0, 1, &value, 1)) {

printf("Read device ID error!\n");

return -1;

}

Re: Ho to modify code when change pmu?

igorpadykov — Sun, 04 Oct 2015 10:31:56 GMT

from you log in first message : "i2c_addr failed

Read device ID error!'

seems smth wrong with ID read of pmic