Re: [PATCH 2/3] arm: tegra: enable igb, stmpe, i2c chardev, spidev, lm95245, pwm leds

Marcel Ziswiler
2014-06-09T22:17:14Z

On 06/04/2014 01:17 PM, Mark Brown wrote:
> You're saying you're controlling it from userspace. This is a
> particular detail of what you are doing in your system. You happen to
> want to control the devices you are hanging off the system with
> userspace drivers but that's just what you're doing right now.

Sorry, I don't get it. Yes, spidev is to control stuff from user space
just like i2c-dev however bad that might sound.

> No, that's in the controller node - the chip selects are described
> there. The child node references a chip select number that the master
> has and describes what's connected to that chip select.

Well, unfortunately SPI without any chip select is just plain simply
useless. It won't work.

> It's a perfectly fine way of controlling things from userspace if that's
> a sensible way of controlling devices but that does not mean you should
> describe it in the device tree in that fashion.

Only that without describing such a chip select in the device tree
spidev won't ever work.

I don't see us reaching any consensus here therefore I retreat. I will
re-submit the whole thing without spidev however sad having to see that
useful feature being dropped.