Linux driver for IRPS5401 - status reg not found

[Michal Simek <michal.simek@xilinx.com>]

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 */
188                         };
189                         irps5401_4d: irps5401@44 {
190                                 compatible = "infineon,irps5401";
191                                 reg = <0x44>; /* pmbus / i2c 0x14 */
192                         };

I see that driver is used but with error.

[   37.553740] irps5401 3-0043: PMBus status register not found
[   37.559815] irps5401 3-0044: PMBus status register not found


That's why I want to check with you what could be the problem.

Also I would like to know if there is a way to disable it via any API.
One of this regulator is connected to another device which doesn't have
access to it. It means before powering up this device there is a need to
enable this power regulator. The best via any dedicated API.

Thanks,
Michal