On 07.10.2019 10:47, Eugen Hristev wrote:

On 11.09.2019 11:24, Eugen Hristev - M18282 wrote:

quoted

From: Eugen Hristev <redacted>

Hello,

This series adds support for analog and digital filters for i2c 
controllers

This series is based on the series:
[PATCH v2 0/9] i2c: at91: filters support for at91 SoCs
and later
[PATCH v4 0/9] i2c: add support for filters
and enhanced to add the bindings for all controllers plus an extra 
bindings
for the width of the spikes in nanoseconds (digital filters) and cut-off
frequency (analog filters)

First, bindings are created for
'i2c-analog-filter'
'i2c-digital-filter'
'i2c-digital-filter-width-ns'
'i2c-analog-filter-cutoff-frequency'

The support is added in the i2c core to retrieve filter width/cutoff 
frequency
and add it to the timings structure.
Next, the at91 driver is enhanced for supporting digital filter, advanced
digital filter (with selectable spike width) and the analog filter.

Finally the device tree for two boards are modified to make use of the
new properties.

This series is the result of the comments on the ML in the direction
requested: to make the bindings globally available for i2c drivers.

Changes in v5:
- renamed i2c-filter-width-ns to i2c-digital-filter-width-ns as this
is applicable only to digital filter
- created new binding i2c-digital-filter-width-ns for analog filters.

Hello Wolfram and Peter,

Are you happy with the changes in this version? I haven't heard from you 
since this latest update.
I am interested to know if anymore changes are required or maybe we can 
move further with this support.

Thanks !
Eugen

Gentle ping

quoted

Changes in v4:
- renamed i2c-ana-filter to i2c-analog-filter
- renamed i2c-dig-filter to i2c-digital-filter

Changes in v3:
- made bindings global for i2c controllers and modified accordingly
- gave up PADFCDF bit because it's a lack in datasheet
- the computation on the width of the spike is based on periph clock 
as it
is done for hold time.

Changes in v2:
- added device tree bindings and support for enable-ana-filt and
enable-dig-filt
- added the new properties to the DT for 
sama5d4_xplained/sama5d2_xplained

Eugen Hristev (9):
   dt-bindings: i2c: at91: add new compatible
   dt-bindings: i2c: add bindings for i2c analog and digital filter
   i2c: add support for filters optional properties
   i2c: at91: add new platform support for sam9x60
   i2c: at91: add support for digital filtering
   i2c: at91: add support for advanced digital filtering
   i2c: at91: add support for analog filtering
   ARM: dts: at91: sama5d2_xplained: add analog and digital filter for
     i2c
   ARM: dts: at91: sama5d4_xplained: add digital filter for i2c

  Documentation/devicetree/bindings/i2c/i2c-at91.txt |  3 +-
  Documentation/devicetree/bindings/i2c/i2c.txt      | 18 ++++++++
  arch/arm/boot/dts/at91-sama5d2_xplained.dts        |  6 +++
  arch/arm/boot/dts/at91-sama5d4_xplained.dts        |  1 +
  drivers/i2c/busses/i2c-at91-core.c                 | 38 
+++++++++++++++++
  drivers/i2c/busses/i2c-at91-master.c               | 49 
++++++++++++++++++++--
  drivers/i2c/busses/i2c-at91.h                      | 13 ++++++
  drivers/i2c/i2c-core-base.c                        |  6 +++
  include/linux/i2c.h                                |  6 +++
  9 files changed, 136 insertions(+), 4 deletions(-)

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