i.MX ProcessorsのトピックRe: How to access SPI from kernel source

How to access SPI from kernel source

lalabhaidesai — Thu, 30 Nov 2017 12:59:53 GMT

Hello,

I am using IMX6UL. We have access SPI from user-space using spidev and it is working fine. Now we wants to access SPI from the kernel(from reboot.c file) to give some data to attached slaves just before the kernel power off. So please guide me how to access SPI from this place. how to initialize , configure and send/receive data through SPI from reboot.c kernel file. We are using Linux kernel 4.1.15

Regards,

Lalabhai

Re: How to access SPI from kernel source

b36401 — Fri, 01 Dec 2017 02:22:42 GMT

To access it in kernel space you can write kernel application (kernel driver).
http://derekmolloy.ie/writing-a-linux-kernel-module-part-1-introduction/

Have a great day,
Victor

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Re: How to access SPI from kernel source

lalabhaidesai — Fri, 01 Dec 2017 04:36:06 GMT

Hello Victor,

Thanks for your reply.

Can i use spidev driver from "reboot.c" kernel file and if yes then how? I am beginner and don't have much more knowledge in Linux so please help me.

Regards,

Lalabhai