linux.git/drivers/i2c, branch v6.8-rc2

Merge tag 'i2c-for-6.8-rc1-rebased' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux

2024-01-19T01:29:01+00:00

Pull i2c updates from Wolfram Sang:
 "This removes the currently unused CLASS_DDC support (controllers set
  the flag, but there is no client to use it).

  Also, CLASS_SPD support gets simplified to prepare removal in the
  future. Class based instantiation is not recommended these days
  anyhow.

  Furthermore, I2C core now creates a debugfs directory per I2C adapter.
  Current bus driver users were converted to use it.

  Finally, quite some driver updates. Standing out are patches for the
  wmt-driver which is refactored to support more variants.

  This is the rebased pull request where a large series for the
  designware driver was dropped"

* tag 'i2c-for-6.8-rc1-rebased' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux: (38 commits)
  MAINTAINERS: use proper email for my I2C work
  i2c: stm32f7: add support for stm32mp25 soc
  i2c: stm32f7: perform I2C_ISR read once at beginning of event isr
  dt-bindings: i2c: document st,stm32mp25-i2c compatible
  i2c: stm32f7: simplify status messages in case of errors
  i2c: stm32f7: perform most of irq job in threaded handler
  i2c: stm32f7: use dev_err_probe upon calls of devm_request_irq
  i2c: i801: Add lis3lv02d for Dell XPS 15 7590
  i2c: i801: Add lis3lv02d for Dell Precision 3540
  i2c: wmt: Reduce redundant: REG_CR setting
  i2c: wmt: Reduce redundant: function parameter
  i2c: wmt: Reduce redundant: clock mode setting
  i2c: wmt: Reduce redundant: wait event complete
  i2c: wmt: Reduce redundant: bus busy check
  i2c: mux: reg: Remove class-based device auto-detection support
  i2c: make i2c_bus_type const
  dt-bindings: at24: add ROHM BR24G04
  eeprom: at24: use of_match_ptr()
  i2c: cpm: Remove linux,i2c-index conversion from be32
  i2c: imx: Make SDA actually optional for bus recovering
  ...

i2c: stm32f7: add support for stm32mp25 soc

2024-01-18T20:10:44+00:00

The stm32mp25 has only a single interrupt line used for both
events and errors. In order to cope with that, reorganise the
error handling code so that it can be called either from the
common handler (used in case of SoC having only a single IT line)
and the error handler for others.
The CR1 register also embeds a new FMP bit, necessary when running
at Fast Mode Plus frequency. This bit should be used instead of
the SYSCFG bit used on other platforms.
Add a new compatible to distinguish between the SoCs and two
boolean within the setup structure in order to know if the
platform has a single/multiple IT lines and if the FMP bit
within CR1 is available or not.

Signed-off-by: Valentin Caron 
Signed-off-by: Alain Volmat 
Signed-off-by: Wolfram Sang

i2c: stm32f7: perform I2C_ISR read once at beginning of event isr

2024-01-18T20:10:44+00:00

Move readl_relaxed of I2C_ISR register at beginning of event isr
so that it done once for both master & slave handling.

Signed-off-by: Alain Volmat 
Signed-off-by: Wolfram Sang

i2c: stm32f7: simplify status messages in case of errors

2024-01-18T20:10:44+00:00

Avoid usage of __func__ when reporting an error message
since dev_err/dev_dbg are already providing enough details
to identify the source of the message.

Signed-off-by: Alain Volmat 
Reviewed-by: Andi Shyti 
Signed-off-by: Wolfram Sang

i2c: stm32f7: perform most of irq job in threaded handler

2024-01-18T20:10:44+00:00

The irq handling is currently split between the irq handler
and the threaded irq handler.  Some of the handling (such as
dma related stuffs) done within the irq handler might sleep or
take some time leading to issues if the kernel is built with
realtime constraints.  In order to fix that, perform an overall
rework to perform most of the job within the threaded handler
and only keep fifo access in the non threaded handler.

Signed-off-by: Alain Volmat 
Reviewed-by: Andi Shyti 
Signed-off-by: Wolfram Sang

i2c: stm32f7: use dev_err_probe upon calls of devm_request_irq

2024-01-18T20:10:44+00:00

Convert error handling upon calls of devm_request_irq functions during
the probe of the driver.

Signed-off-by: Alain Volmat 
Signed-off-by: Wolfram Sang

i2c: i801: Add lis3lv02d for Dell XPS 15 7590

2024-01-18T20:10:43+00:00

On the Dell XPS 15 7590/0VYV0G, BIOS 1.24.0 09/11/2023, Linux prints the
warning below.

    i801_smbus 0000:00:1f.4: Accelerometer lis3lv02d is present on SMBus but its address is unknown, skipping registration

Following the same suggestions by Wolfram Sang as for the Dell Precision
3540 [1], the accelerometer can be successfully found on I2C bus 2 at
address 0x29.

    $ echo lis3lv02d 0x29 | sudo tee /sys/bus/i2c/devices/i2c-2/new_device
    lis3lv02d 0x29
    $ dmesg | tail -5
    [  549.522876] lis3lv02d_i2c 2-0029: supply Vdd not found, using dummy regulator
    [  549.522904] lis3lv02d_i2c 2-0029: supply Vdd_IO not found, using dummy regulator
    [  549.542486] lis3lv02d: 8 bits 3DC sensor found
    [  549.630022] input: ST LIS3LV02DL Accelerometer as /devices/platform/lis3lv02d/input/input35
    [  549.630586] i2c i2c-2: new_device: Instantiated device lis3lv02d at 0x29

So, the device has that accelerometer. Add the I2C address to the
mapping list, and test it successfully on the device.

[1]: https://lore.kernel.org/linux-i2c/97708c11-ac85-fb62-2c8e-d37739ca826f@molgen.mpg.de/

Signed-off-by: Paul Menzel 
Acked-by: Pali Rohár 
Reviewed-by: Andi Shyti 
Signed-off-by: Wolfram Sang

i2c: i801: Add lis3lv02d for Dell Precision 3540

2024-01-18T20:10:43+00:00

On the Dell Precision 3540/0M14W7, BIOS 1.7.4 05/12/2020, Linux prints
the warning below.

    i801_smbus 0000:00:1f.4: Accelerometer lis3lv02d is present on SMBus but its address is unknown, skipping registration

With the help of Wolfram Sang, the test to probe it on I2C bus 6 at address
0x29 was successful.

    $ echo lis3lv02d 0x29 | sudo tee /sys/bus/i2c/devices/i2c-6/new_device
    [ 2110.787000] i2c i2c-6: new_device: Instantiated device lis3lv02d at 0x29
    [ 2110.791932] lis3lv02d_i2c 6-0029: supply Vdd not found, using dummy regulator
    [ 2110.791981] lis3lv02d_i2c 6-0029: supply Vdd_IO not found, using dummy regulator
    [ 2110.809233] lis3lv02d: 8 bits 3DC sensor found
    [ 2110.900668] input: ST LIS3LV02DL Accelerometer as /devices/platform/lis3lv02d/input/input23

So, the device has that accelerometer. Add the I2C address to the
mapping list.

Link: https://lore.kernel.org/linux-i2c/97708c11-ac85-fb62-2c8e-d37739ca826f@molgen.mpg.de/
Signed-off-by: Paul Menzel 
Acked-by: Pali Rohár 
Reviewed-by: Andi Shyti 
[wsa: shortened commit message a little]
Signed-off-by: Wolfram Sang

i2c: wmt: Reduce redundant: REG_CR setting

2024-01-18T20:10:43+00:00

These Settings for the same register, REG_CR,
can be put together to reduce code redundancy.

Signed-off-by: Hans Hu 
Signed-off-by: Wolfram Sang

i2c: wmt: Reduce redundant: function parameter

2024-01-18T20:10:43+00:00

Use more appropriate parameter passing to reduce the amount of code

Signed-off-by: Hans Hu 
Signed-off-by: Wolfram Sang