Ultrazed-EV: Unable to locate the Infineon power chips. ( PMBUS )

Hi Avnet,

Currrently i'm tying to make a connection with all the I2C devices on the Ultrazed-EV board. I managed to reach the eeproms, the gpio extender and the i2C mux but i'm struggling to make this final I2C connection to the Infineon chips.

I see all the chips via the Infineon software and the USB005 dongle which gives me a nice overview of the chips and their correlating addresses ( image below )

However I don't seem to manage to connect to them via the Zynqmp Linux root files system. The address 0x6a , which is the PLL chip behind the i2c mux, seems to been found by it's diver. I think there should be 4 Infineon chips in this i2c region/channel (U18, U19 U21 end U22 )

Can someone point out to me how I can make these infineon chips appear in the root file system? Any help is very welcome..

Thanks Deville

0 deville over 6 years ago

I found this solution rather quickly in the end.

I must have used a device tree snippet from the zcu102 board or just made a plain mistake. Either way I used (the device tree ) compatible string "nxp,pca9542" instead of the I2C chip used on the Ultrazed board. "pca9543"
Both devices are using the same driver ( drivers/i2c/muxes/i2c-mux-pca954x.c ) but the pca9542 chip is a mux, while pca9543 is in fact a switch. This mixup caused the driver to treat the device differently, trying to set a mux channel ( value 0x04 )

Now I have my devices:

Thanks Avnet !
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0 deville over 6 years ago in reply to deville
Another Issue popped up after finding the previous solution. On the UltraZed-EV board there are some Infineon chips with PMBUS capabilities present like i mentioned at the start of this thread.

These chips have no drivers present in my kernel ( 4.14 ) so I used the generic PMBUS driver. However there should be some PMBUS Sysfs entries present once booted but this seems not to be working.

All I get is:
[zynqmp@zynqmp ~ ]$ dmesg | grep pmbus [ 1.475625] pmbus 1-004b: PMBus status register not found [ 1.475921] pmbus 1-004c: PMBus status register not found [ 1.476212] pmbus 1-0049: PMBus status register not found [ 1.476503] pmbus 1-004a: PMBus status register not found [ 1.490635] pmbus 2-0046: No attributes found [ 1.504554] pmbus 2-0047: No attributes found [ 1.520525] pmbus 2-0048: No attributes found

Can you give me any advice on this issue Avnet? Should I be doing my own readout from userspace? ( I can do readouts and manipulations via the I2C tools )

Thanks in advance
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0 narrucmot over 6 years ago in reply to deville

Hi deville,
Can you share your <petalinux project folder>/project-spec/meta-user/recipes-bsp/device-tree/files/system-user.dtsi file with me? I suspect it is missing the correct descriptions of the I2C mux and Infineon PMICs.

Thanks,
Tom
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0 deville over 6 years ago in reply to narrucmot

Hi narrucmot

Yes certainly, I must say I don't use Petalinux but it just should be same.

Thanks for your help on this.

&i2c1 {
     status = "okay";
     clock-frequency = <100000>;
     i2c-eeprom1@50 {
          #size-cells = <0>;
          #address-cells = <1>;
          compatible = "at,at24c08";
          reg = <0x50>;
     };

     /*later kernels onnn,pca9654 */
     io_expander: gpio@20 {
          compatible = "onsemi,pca9654";         
          reg = <0x20>;
          pinctrl-names = "default";
          pinctrl-0 = <&i2c1_pins>;
          gpio-controller;
          #gpio-cells = <2>;
          /*interrupt-parent = <&gic>;*/
          /*interrupts = <23 IRQ_TYPE_LEVEL_LOW>;*/
     };

     i2c-switch@70 { /* U7 on UZ3EG SOM, U8 on UZ7EV SOM */
          compatible = "nxp,pca9543";
          #address-cells = <1>;
          #size-cells = <0>;
          reg = <0x70>;
          i2c@0 {
               #address-cells = <1>;
               #size-cells = <0>;
               reg = <0>;
               versaclock@6a {
                    compatible = "idt,5p49v5935" ;
                    reg = <0x6a> ;
               };
               mac-eeprom2@51 {
                    #size-cells = <0>;
                    #address-cells = <1>;
                    compatible = "at,at24c08";
                    reg = <0x51>;
               };
               ir38063_4b: ir38063@4b { /* IR38063 - U18   */
                    #clock-cells = <0>;
                    compatible = "generic,pmbus";
                    reg = <0x4b>;
               };
               ir38063_4c: ir38063@4c { /* IR38063 - U19   */
                    #clock-cells = <0>;
                    compatible = "generic,pmbus";
                    reg = <0x4c>;
               };

               irps5401_49: irps54012@49 { /* IRPS5401 - U21   */
                    #clock-cells = <0>;
                    compatible = "generic,pmbus";
                    reg = <0x49>;
               };
               irps5401_4a: irps54012@4a { /* IRPS5401 - U22   */
                    #clock-cells = <0>;
                    compatible = "generic,pmbus";
                    reg = <0x4a>;
               };
          };
          i2c@1 { /* i2c mw 70 0 1 */
               #address-cells = <1>;
               #size-cells = <0>;
               reg = <1>;
               irps5401_46: irps54012@46 { /* IRPS5401 - U24   */
                    #clock-cells = <0>;
                    compatible = "generic,pmbus";
                    reg = <0x46>;
               };
               irps5401_47: irps54012@47 { /* IRPS5401 - U25 */
                    #clock-cells = <0>;
                    compatible = "generic,pmbus";
                    reg = <0x47>;
               };
               irps5401_48: irps54012@48 { /* IRPS5401 - U26 */
                    #clock-cells = <0>;
                    compatible = "generic,pmbus";
                    reg = <0x48>;
               };
          };
     };
};