linux-kernel - Re: [PATCH v3 0/9] i2c: add support for filters

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Date:   Fri, 12 Jul 2019 10:20:44 +0200
From:   Ludovic Desroches <ludovic.desroches@...rochip.com>
To:     Eugen Hristev - M18282 <Eugen.Hristev@...rochip.com>
CC:     "wsa@...-dreams.de" <wsa@...-dreams.de>,
        "peda@...ntia.se" <peda@...ntia.se>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "pierre-yves.mordret@...com" <pierre-yves.mordret@...com>,
        "alexandre.belloni@...tlin.com" <alexandre.belloni@...tlin.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        Nicolas Ferre - M43238 <Nicolas.Ferre@...rochip.com>
Subject: Re: [PATCH v3 0/9] i2c: add support for filters

On Tue, Jul 09, 2019 at 03:19:26PM +0200, 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 enhanced to add the bindings for all controllers plus an extra binding
> for the width of the spikes in nanoseconds.
> 
> First, bindings are created for
> 'i2c-ana-filter'
> 'i2c-dig-filter'
> 'i2c-filter-width-ns'
> 
> The support is added in the i2c core to retrieve filter width 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 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 filter-width-ns optional property
>   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 analog filter for i2c
> 
>  Documentation/devicetree/bindings/i2c/i2c-at91.txt |  3 +-
>  Documentation/devicetree/bindings/i2c/i2c.txt      | 11 +++++
>  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                        |  2 +
>  include/linux/i2c.h                                |  2 +
>  9 files changed, 121 insertions(+), 4 deletions(-)

Hi,

I don't know if it will fit other vendors need concerning the binding
but for Microchip it sounds good.

Acked-by: Ludovic Desroches <ludovic.desroches@...rochip.com>
for the whole serie.

Regards

Ludovic