i.MX ProcessorsのトピックRe: Fixed can sequence

Fixed can sequence

qwerqq — Mon, 27 Nov 2023 01:25:07 GMT

We have changed the scheme and no longer use this pin. I have another question. Now I use spi to transfer all the way to can, but now the device node of can will change every time I start, is there any way to fix the device node? Thank you!

Re: Fixed can sequence

jimmychan — Mon, 27 Nov 2023 02:41:53 GMT

Could you tell me which product are you using?

Which version of BSP are you using?

What you mean the "the device node of can will change every time I start"? Could you show me what is it?

Re: Fixed can sequence

qwerqq — Mon, 27 Nov 2023 03:54:05 GMT

I am using imx8mp and I am using version 5.4.70。

My demand is three can, there were two on the development board, now I use spi to can method, add a new can, I use the chip is 2515, the driver kernel source code contains 2515 driver, but spi to can chip out of the can node number is not fixed。

Here's an example:

SPI to CAN corresponding software node: can1;

Software node of CAN1: can0;

CAN2 Software node: can2.

But if I start here, it will become the following situation:

SPI to CAN corresponding software node: can2;

Software node of CAN1: can0;

Software node of CAN2: can1.

Therefore, I would like to ask if there is any way to make the node number from spi to can fixed as can2.

My dts configuration is as follows:

Re: Fixed can sequence

jimmychan — Thu, 30 Nov 2023 05:35:13 GMT

Do you mean the spi->can number will change every time you boot up?

Re: Fixed can sequence

qwerqq — Thu, 30 Nov 2023 06:02:58 GMT

yes。

Re: Fixed can sequence

qwerqq — Thu, 30 Nov 2023 06:04:15 GMT

Or do you have a way to convert spi to can? I can try it here.

Re: Fixed can sequence

jimmychan — Thu, 30 Nov 2023 06:53:11 GMT

FYI.

https://www.cnblogs.com/uvsjoh/archive/2011/08/08/2130887.html