[PATCH v4 00/11] add mcf54415 DAC driver

This patchset adds a minimalistic DAC driver for the NXP mcf54415/6/7/8
ibuiltin DACs.

Currently the driver enables the raw write only. Feature as dma, sync, or
format are not supoprted for this version.

Additional options suppoerted by the DAC module will be added to the driver
later on, as needed.

The same patchset prepares the m68k/coldfire architecture to support
the driver.

Below soem basic tests done on stmark2 mcf54415-based board, voltage check
on DAC0 and DAC1:

~ # cd /sys/bus/iio/devices/iio:device0/
/sys/bus/iio/devices/iio:device0 # ls
name               out_voltage_scale  uevent
out_voltage_raw    subsystem
/sys/bus/iio/devices/iio:device0 # cat name
mcf54415
/sys/bus/iio/devices/iio:device0 # echo 4095 > out_voltage_raw 
/sys/bus/iio/devices/iio:device0 # echo 2048 > out_voltage_raw 
/sys/bus/iio/devices/iio:device0 # echo 4096 > out_voltage_raw 
sh: write error: Invalid argument
/sys/bus/iio/devices/iio:device0 # cat out_voltage_raw 
2048
/sys/bus/iio/devices/iio:device0 # 

Same behavior for /sys/bus/iio/devices/iio:device1.

Generated a sine wave by shell script, sine shape is good.

is actually in progress:

Note: this patchset depends on mew mcf_read/mcf_write implementation that
Link: https://lore.kernel.org/linux-m68k/[email protected]/T/#t
Link: https://lore.kernel.org/linux-m68k/[email protected]/
---
Changes in v4:
- keeping changelog in each single patch, where any
- Link to v3: https://patch.msgid.link/[email protected]

Changes in v3:
- keeping changelog in each single patch, where any
- Link to v2: https://patch.msgid.link/[email protected]

Changes in v2:
- keeping changelog in each single patch, where any
- Link to v1: https://patch.msgid.link/[email protected]

To: Greg Ungerer <[email protected]>
To: Geert Uytterhoeven <[email protected]>
To: Steven King <[email protected]>
To: Arnd Bergmann <[email protected]>
To: Maxime Coquelin <[email protected]>
To: Alexandre Torgue <[email protected]>
To: Jonathan Cameron <[email protected]>
To: David Lechner <[email protected]>
To: Nuno Sá <[email protected]>
To: Andy Shevchenko <[email protected]>
Cc: Greg Ungerer <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]

---
Angelo Dureghello (11):
      m68k: mcf5441x: fix clocks numbering
      m68k: mcf5441x: add clock for DAC channel 1
      m68k: mcf5441x: initialize DAC clocks by iio DAC driver name
      m68k: defconfig: update stmark2 defconfig
      m68k: add DAC modules base addresses
      m68k: mcf5441x: add CCM registers
      m68k: mcf5441x: add CCR MISCCR2 bitfields
      m68k: stmark2: use ioport.h macros for resources
      m68k: stmark2: add mcf5441x DAC platform devices
      m68k: stmark2: enable DACs outputs
      iio: dac: add mcf54415 DAC

 arch/m68k/coldfire/m5441x.c         |  21 ++--
 arch/m68k/coldfire/stmark2.c        |  47 +++++---
 arch/m68k/configs/stmark2_defconfig |   2 +
 arch/m68k/include/asm/m5441xsim.h   |  42 +++++++
 drivers/iio/dac/Kconfig             |  11 ++
 drivers/iio/dac/Makefile            |   1 +
 drivers/iio/dac/mcf54415_dac.c      | 211 ++++++++++++++++++++++++++++++++++++
 7 files changed, 311 insertions(+), 24 deletions(-)
---
base-commit: 9edf4183f0d32146b708220d56ee2d35905ba516
change-id: 20260430-wip-stmark2-dac-7060f49dd94f

Best regards,
--  
Angelo Dureghello <[email protected]>