kernel driver for rs232 serial peripheral
Joey Oravec
joravec at drewtech.com
Thu Aug 25 17:28:25 EDT 2011
Fellow ARM developers,
We make a multi-function chip (rtc, gpio, nvram, etc) for embedded
applications that has an rs232 serial interface. My goal is to write an
MFD kernel driver that speaks serial to this device and implements
interfaces. Other busses like spi and i2c are pretty straightforward in
the kernel but serial feels a lot more complicated. To talk to this
device from the kernel it seems like I need to:
- Call tty_register_ldisc to create a line discipline
- Call tty_register_driver and setup a driver
- Require userspace to call setserial and change the line discipline
This might work, but the documentation implies that a line discipline is
for a protocol, not for connecting a device driver to a serial port. Is
there any kind of easier-to-use serial class similar to i2c or spi where
I can just setup a platform device/driver on a specific serial port? Am
I missing an easier solution?
-joey
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