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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Message-ID: <20190627133440.GA7158@ninjato>
Date:   Thu, 27 Jun 2019 15:34:40 +0200
From:   Wolfram Sang <wsa@...-dreams.de>
To:     Eugen.Hristev@...rochip.com
Cc:     alexandre.belloni@...tlin.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)


> > 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.

> I am looking to see what is PADFCFG , as it's related to the PAD analog 
> filter configuration. It may be unused by the filter.

Thanks!


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