Constify struct cfattach.

ok visa@ a long time ago, ok patrick@

Run the sxitemp(4) at IPL_SOFTCLOCK instead of IPL_VM. Prevents "panic:
mtx ...: locking against myself" on Orange Pi Zero.

Analysis by patrick@:

"The thermal sensor framework uses its own taskq with IPL_SOFTCLOCK.
sxitemp(4) calls thermal_sensor_update() from interrupt context, and
sxitemp(4) is using IPL_VM (memory allocation?!) for its interrupt.

IPL_VM is obviously higher than IPL_SOFTCLOCK, so it ends up being able
to interrupt the taskq. Even though we're in msleep_nsec, I think we
have *not yet* given up the mutex, that we are holding while looking for
more work, only releasing it while sleeping.

Thus, the interrupt runs task_add(), which tries to grab the taskq's
mutex, even though the taskq already holds it!"

ok patrick@ kettenis@

Make thermal framework support in sxitemp(4) interrupt driven such that
it works with future Linux device trees.

ok patrick@

Use information from nvmem (provided by sxisid(4)) to calibrate the
temperature sensors.

ok patrick@

Register sxitemp(4) as a thermal sensor with the thermal zone support code.
From Krystian Lewandowski.

Add Allwinner A64 support.

Add support for the Allwinner H3 SoC.

Add Allwinner R40/V40 support.

Add sxitemp(4), a driver for the temperature sensors on the Allwinner H5 SoC.

Run the sxitemp(4) at IPL_SOFTCLOCK instead of IPL_VM. Prevents "panic:
mtx ...: locking against myself" on Orange Pi Zero.

Analysis by patrick@:

"The thermal sensor framework uses its own taskq with IPL_SOFTCLOCK.
sxitemp(4) calls thermal_sensor_update() from interrupt context, and
sxitemp(4) is using IPL_VM (memory allocation?!) for its interrupt.

IPL_VM is obviously higher than IPL_SOFTCLOCK, so it ends up being able
to interrupt the taskq. Even though we're in msleep_nsec, I think we
have *not yet* given up the mutex, that we are holding while looking for
more work, only releasing it while sleeping.

Thus, the interrupt runs task_add(), which tries to grab the taskq's
mutex, even though the taskq already holds it!"

ok patrick@ kettenis@

Make thermal framework support in sxitemp(4) interrupt driven such that
it works with future Linux device trees.

ok patrick@

Use information from nvmem (provided by sxisid(4)) to calibrate the
temperature sensors.

ok patrick@

Register sxitemp(4) as a thermal sensor with the thermal zone support code.
From Krystian Lewandowski.

Add Allwinner A64 support.

Add support for the Allwinner H3 SoC.

Add Allwinner R40/V40 support.

Add sxitemp(4), a driver for the temperature sensors on the Allwinner H5 SoC.

Make thermal framework support in sxitemp(4) interrupt driven such that
it works with future Linux device trees.

ok patrick@

Use information from nvmem (provided by sxisid(4)) to calibrate the
temperature sensors.

ok patrick@

Register sxitemp(4) as a thermal sensor with the thermal zone support code.
From Krystian Lewandowski.

Add Allwinner A64 support.

Add support for the Allwinner H3 SoC.

Add Allwinner R40/V40 support.

Add sxitemp(4), a driver for the temperature sensors on the Allwinner H5 SoC.

Use information from nvmem (provided by sxisid(4)) to calibrate the
temperature sensors.

ok patrick@

Register sxitemp(4) as a thermal sensor with the thermal zone support code.
From Krystian Lewandowski.

Add Allwinner A64 support.

Add support for the Allwinner H3 SoC.

Add Allwinner R40/V40 support.

Add sxitemp(4), a driver for the temperature sensors on the Allwinner H5 SoC.

Register sxitemp(4) as a thermal sensor with the thermal zone support code.
From Krystian Lewandowski.

Add Allwinner A64 support.

Add support for the Allwinner H3 SoC.

Add Allwinner R40/V40 support.

Add sxitemp(4), a driver for the temperature sensors on the Allwinner H5 SoC.

Add Allwinner A64 support.

Add support for the Allwinner H3 SoC.

Add Allwinner R40/V40 support.

Add sxitemp(4), a driver for the temperature sensors on the Allwinner H5 SoC.

Add Allwinner R40/V40 support.

Add sxitemp(4), a driver for the temperature sensors on the Allwinner H5 SoC.