topic Re: Imx28 spidev kernel 2.6.35.3 in i.MX Processors

Imx28 spidev kernel 2.6.35.3

shashikanthirem — Sat, 21 Mar 2020 23:49:18 GMT

Hi all,

I am using spidev modalias for spi communication, I used spi test.c to validate which in document folder, but I end up in transfer failed

I am using spidev with kernel version 2.6.35.3

I have got /dev/spidev 2.1

Perror

Invalid argument

If any one face similar problem, provide me patch or suggestions

Thanks

Re: Imx28 spidev kernel 2.6.35.3

igorpadykov — Sun, 22 Mar 2020 22:59:27 GMT

Hi shashikant

for L.2.6.35 spidev one can look at

https://community.nxp.com/thread/316764

Best regards
igor
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Re: Imx28 spidev kernel 2.6.35.3

shashikanthirem — Mon, 23 Mar 2020 02:35:56 GMT

Yes i followed the same , but i didnt the spi read write working, not sure sure what i am missing

Re: Imx28 spidev kernel 2.6.35.3

igorpadykov — Mon, 23 Mar 2020 06:26:10 GMT

probably you did not rebuild image, please look at "scbuild" option on

LTIB : LtibFaq

Best regards
igor

Re: Imx28 spidev kernel 2.6.35.3

shashikanthirem — Mon, 23 Mar 2020 20:52:55 GMT

Yes i rebuild all

if following condition i satisfied

struct spi_ioc_transfer tr = {
.tx_buf = (unsigned long)tx,
//.rx_buf = (unsigned long)rx,
.rx_buf = 0, -----------------------------------> need to do
.len = size,
.delay_usecs = spi_setup->delay,
.speed_hz = spi_setup->speed,
.bits_per_word = spi_setup->bits,
.cs_change = spi_setup->cs_change,
};

This works as only write spi/ but not read

Re: Imx28 spidev kernel 2.6.35.3

shashikanthirem — Tue, 24 Mar 2020 06:06:45 GMT

How to spi bit bank in imx28 by using ltib,

Note: no dtsi concept