On 30. 03. 20 21:48, Guenter Roeck wrote:
> On Mon, Mar 30, 2020 at 01:09:56PM -0600, Robert Hancock wrote:
>> On 2020-03-30 12:48 p.m., Guenter Roeck wrote:
>>> On 3/30/20 8:42 AM, Robert Hancock wrote:
>>>> On 2020-03-30 9:24 a.m., Guenter Roeck wrote:
>>>>> On 3/30/20 4:33 AM, Michal Simek wrote:
>>>>>> Hi Robert and Guenter,
>>>>>>
>>>>>> Xilinx boards are using IRPS5401 chips and I have tried to use your driver.
>>>>>> I have checked that u-boot can detect that devices and read it.
>>>>>>
>>>>>> ZynqMP> i2c probe
>>>>>> Valid chip addresses: 0C 13 14 20 43 44 74
>>>>>> ZynqMP> i2c md 13 0 10
>>>>>> 0000: 00 08 00 08 00 08 00 08 00 08 00 08 00 08 00 08 ................
>>>>>> ZynqMP> i2c md 14 0 10
>>>>>> 0000: 00 08 00 08 00 08 00 08 00 08 00 08 00 08 00 08 ................
>>>>>> ZynqMP> i2c md 43 0 10
>>>>>> 0000: 00 98 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................
>>>>>> ZynqMP> i2c md 44 0 10
>>>>>> 0000: 00 8a ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................
>>>>>> ZynqMP>
>>>>>>
>>>>>> Here is DT fragment which I use (it is under i2c mux)
>>>>>>
>>>>>> 185 irps5401_43: irps5401@43 {
>>>>>> 186 compatible = "infineon,irps5401";
>>>>>> 187 reg = <0x43>; /* pmbus / i2c 0x13 */
>>>>>
>>>>> Does that mean the mux is at 0x13 ?
>>>>
>>>> These chips have two I2C addresses with two separate interfaces: the standard PMBus-compatible interface at an address between 0x40-0x4f, which the irps5401 driver supports, and another proprietary interface at an address between 0x10-0x1f. The specific addresses in those ranges is configured by the value of a resistor on one of the pins.
>>>>
>>>
>>> Ah, sorry, I didn't get that part earlier. Unfortunately, the datasheet
>>> doesn't seem to include a description of the proprietary interface
>>> registers/commands, or maybe I am missing it.
>>>
>>> The chip datasheet does talk a lot about various MTP registers.
>>> Part of that register set is Write_protect_section and
>>> Read_protect_section. Maybe the PMBus registers are all read
>>> protected ?
>>
>> There is a programming guide and register map on the Infineon site under
>> "Additional Technical Information" here:
>>
>> https://www.infineon.com/cms/en/product/power/dc-dc-converters/integrated-pol-voltage-regulators/irps5401m/
>>
> Based on that my best guess would be that either the chips are not at the
> expected addresses, or that the registers are indeed read protected.
I am able to detect that devices.
root@zcu104-debian:/etc/apt# i2cdetect -y -r 3
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- 13 14 -- -- -- -- -- -- -- -- -- -- --
20: UU -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- 43 44 -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- UU -- -- --
Also disable/enable rail on 0x44 and see power good led on/off
root@zcu104-debian:~# i2cset -y 3 0x44 0 3
root@zcu104-debian:~# i2cset -y 3 0x44 1 0x80 b
root@zcu104-debian:~# i2cget -y 3 0x44 0x78 b
I can't read the rest of regs but checking with hw guys what they have
done with these devices.
Anyway thanks for your help and advices.
Thanks,
Michal
