TPS65023: standard way to access I2C

William Leung

Prodigy 20 points

Part Number: TPS65023

Hi All,

I am new to embedded linux.

I have config the TPS65023 driver(REGULATOR_TPS65023=Y) and set up the device tree according to

https://www.kernel.org/doc/Documentation/devicetree/bindings/regulator/tps65023.txt

i2cdetect show my device register successfully.

0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- UU -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --

Now I would like to write a client program to control the LDO and DCDC via I2C.

Is there some standard way to achieve this?

I expect something like

include "some_system_file"

some_system_function_openI2C(int I2C5);
some_system_function_writeBlockI2C(int I2C5, char* data, int length);
some_system_function_closeI2C(int I2C5);

I have read https://www.kernel.org/doc/html/latest/i2c/dev-interface.html

The smbus functions seems to fit very nicely. However, the I2C_FUNCS ioctl checking part and user space device driver part make me hesitate whether smbus is really what I want.

any advice would be appreciated.

Leung

over 3 years ago

0 Alex Saenz over 3 years ago

TI__Expert 6700 points

Hello Leung,

Thank you for the post. We should be able to respond by the end of the week.

Regards,

Alex

0 Brenda Diaz over 3 years ago in reply to Alex Saenz

TI__Mastermind 21496 points

Hi Leung,

Thanks for reaching out. Which processor/MCU are you using to control the TPS65023 through I2C? Just need this information so I can get you in contact with the right team as this is a linux question.

Thanks,

Brenda

0 William Leung over 3 years ago in reply to Brenda Diaz

Prodigy 20 points

Hi Brenda,

I am using stm32mp with linux 5.10.

For now I am able to use ioctl with read/write to do so. This approach works very well, but it is a rather "low level" approach. I would like to know is there some other approach to make things easier..

Regards,

Leung

0 Chris Sterzik over 3 years ago in reply to William Leung

TI__Guru 61511 points

Hello Leung,

I am not familiar with the driver, and will need to confirm if higher level APIs are available. Is voltage scaling the only feature you are attempting to implement?

Thanks,
Chris

0 William Leung over 3 years ago in reply to Chris Sterzik

Prodigy 20 points

Hi Chris,

Not really, I need to access the entire device and all the control registers.

Regards,

Leung

+1 Chris Sterzik over 3 years ago in reply to William Leung

TI__Guru 61511 points

Hello,

If the ioctl is working then I would recommend keeping that approach. I was also able to find this reference on github for your consideration.

https://github.com/torvalds/linux/blob/master/drivers/regulator/tps65023-regulator.c

Regards,
Chris

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TPS65023: standard way to access I2C