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

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Message-ID: <20190625095533.GC1688@kunai>
Date:   Tue, 25 Jun 2019 11:55:33 +0200
From:   Wolfram Sang <wsa@...-dreams.de>
To:     Alexandre Belloni <alexandre.belloni@...tlin.com>
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 <pierre-yves.mordret@...com>
Subject: I2C filtering (was Re: [PATCH v2 6/9] dt-bindings: i2c: at91: add
 binding for enable-ana-filt)

On Tue, Jun 25, 2019 at 11:31:56AM +0200, Alexandre Belloni wrote:
> On 25/06/2019 09:14:13+0000, Eugen.Hristev@...rochip.com wrote:
> > > Perhaps
> > > 
> > > 	microchip,digital-filter;
> > > 	microchip,analog-filter;
> > > 
> > > ?
> > 
> > Hi Peter,
> > 
> > Thanks for reviewing. The name of the property does not matter much to 
> > me, and we have properties prefixed with vendor, and some are not.
> > 
> > @Alexandre Belloni: which name you think it's best ?
> > 
> 
> I'm not sure, it depends on whether Wolfram thinks it is generic enough
> to be used without a vendor prefix.

I could imagine that we design a generic property for filters. The ones
above make me wonder, though, because they are bool. I'd think you can
configure the filters in some way, too?

I never used such filtering, so I am unaware of the parameters needed /
suitable. Quick grepping through I2C master drivers reveals that
i2c-stm32f7.c also handles filters, but only with default values. Maybe
DT configuration would be benefitial to that driver, too?

Adding some people to CC.


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