From: Mark Brown <broonie@kernel.org>
To: Cyrille Pitchen <cyrille.pitchen@atmel.com>
Cc: nicolas.ferre@atmel.com, linux-spi@vger.kernel.org,
linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org,
robh+dt@kernel.org, pawel.moll@arm.com, mark.rutland@arm.com,
ijc+devicetree@hellion.org.uk, galak@codeaurora.org
Subject: Re: [PATCH v3 2/3] spi: atmel: update DT bindings documentation
Date: Mon, 15 Jun 2015 16:49:35 +0100 [thread overview]
Message-ID: <20150615154935.GT18309@sirena.org.uk> (raw)
In-Reply-To: <5579B95F.9060307@atmel.com>
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On Thu, Jun 11, 2015 at 06:37:51PM +0200, Cyrille Pitchen wrote:
> Le 09/06/2015 19:25, Mark Brown a écrit :
> > On Tue, Jun 09, 2015 at 01:53:53PM +0200, Cyrille Pitchen wrote:
> >> - add new property "atmel,fifo-size"
> > Why is this a property and not something we know from the IP version?
> Please be aware that the VERSION register can not be used to guess the
> size of FIFOs. Indeed, for a given hardware version, the SPI controller
> can be integrated on Atmel SoCs with different FIFO sizes. Also the
> "atmel,fifo-size" property is optional as older SPI controllers don't
> embed FIFO at all.
...
> Finally, on a given SoC, there can be several instances of the SPI
> controller with different FIFO sizes. This explain why we'd rather use a
> dedicated DT property than use the "compatible" property.
> I hope these pieces of information will help to clarify this point.
> Of course, we are open to other suggestions.
Ugh, what a wonderfully consistent hardware design :( Please make it
clear in the documentation what is going on here, this looks like an
obvious bug in the DT binding - a very common pattern for bugs is to do
version quirks like this as properties.
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next prev parent reply other threads:[~2015-06-15 15:50 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-06-09 11:53 [PATCH v3 0/3] spi: atmel: add support to FIFOs and the internal chip-select Cyrille Pitchen
2015-06-09 11:53 ` [PATCH v3 1/3] spi: atmel: add support for the internal chip-select of the spi controller Cyrille Pitchen
2015-06-09 12:15 ` Nicolas Ferre
2015-06-09 17:26 ` Mark Brown
2016-01-05 21:50 ` Måns Rullgård
2016-01-07 15:40 ` Mark Brown
2016-01-07 16:14 ` Måns Rullgård
2016-01-27 15:46 ` Nicolas Ferre
2016-01-27 15:53 ` Måns Rullgård
2016-01-27 16:55 ` Nicolas Ferre
2016-01-27 16:57 ` Måns Rullgård
2015-06-09 11:53 ` [PATCH v3 2/3] spi: atmel: update DT bindings documentation Cyrille Pitchen
2015-06-09 12:15 ` Nicolas Ferre
2015-06-09 17:25 ` Mark Brown
2015-06-11 16:37 ` Cyrille Pitchen
2015-06-15 15:49 ` Mark Brown [this message]
2015-06-09 11:53 ` [PATCH v3 3/3] spi: atmel: add support to FIFOs Cyrille Pitchen
2015-06-09 12:24 ` Nicolas Ferre
2015-06-09 17:30 ` Mark Brown
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