linux-kernel - Re: [PATCH v5 0/9] i2c: add support for filters

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Date:   Mon, 14 Oct 2019 07:01:40 +0000
From:   <Eugen.Hristev@...rochip.com>
To:     <wsa@...-dreams.de>, <peda@...ntia.se>, <mark.rutland@....com>,
        <Ludovic.Desroches@...rochip.com>, <linux-i2c@...r.kernel.org>,
        <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <alexandre.belloni@...tlin.com>,
        <robh+dt@...nel.org>
CC:     <Nicolas.Ferre@...rochip.com>
Subject: Re: [PATCH v5 0/9] i2c: add support for filters



On 07.10.2019 10:47, Eugen Hristev wrote:
> 
> 
> On 11.09.2019 11:24, Eugen Hristev - M18282 wrote:
>> From: Eugen Hristev <eugen.hristev@...rochip.com>
>>
>> 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


>>
>> 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(-)
>>