linux-kernel - Re: I2C filtering (was Re: [PATCH v2 6/9] dt-bindings: i2c: at91: add binding for enable-ana-filt)

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Date:   Thu, 27 Jun 2019 15:39:32 +0200
From:   Alexandre Belloni <alexandre.belloni@...tlin.com>
To:     Wolfram Sang <wsa@...-dreams.de>
Cc:     Eugen.Hristev@...rochip.com, peda@...ntia.se, robh+dt@...nel.org,
        mark.rutland@....com, Nicolas.Ferre@...rochip.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,
        linux-stm32@...md-mailman.stormreply.com,
        pierre-yves.mordret@...com
Subject: Re: I2C filtering (was Re: [PATCH v2 6/9] dt-bindings: i2c: at91:
 add binding for enable-ana-filt)

On 27/06/2019 15:34:40+0200, Wolfram Sang wrote:
> 
> > > Apart from enabling the filter there is indeed one configuration
> > > setting, the maximum pulse width of spikes to be suppressed by the input
> > > filter.
> 
> Yup, this is what I anticipated.
> 
> > This is a number 0 to 7 (3 bits) that represents the width of the spike 
> > in periph clock cycles.
> 
> For a generic binding, we would need some time-value as a parameter and
> convert it to clock cycles in the driver then, I'd think.
> 

Yes, that is what I was going to suggest.


-- 
Alexandre Belloni, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com