linux-kernel - Re: [PATCH v2 3/5] of-bindings: Add binding documentation for SPI busses and devices

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Date:	Fri, 4 Jul 2008 17:42:46 -0600
From:	"Grant Likely" <grant.likely@...retlab.ca>
To:	"Segher Boessenkool" <segher@...nel.crashing.org>
Cc:	linux-kernel@...r.kernel.org,
	spi-devel-general@...ts.sourceforge.net, david-b@...bell.net,
	linuxppc-dev@...abs.org, fabrizio.garetto@...il.com
Subject: Re: [PATCH v2 3/5] of-bindings: Add binding documentation for SPI busses and devices

On Fri, Jul 4, 2008 at 5:36 PM, Segher Boessenkool
<segher@...nel.crashing.org> wrote:
>> +    The SPI master node requires the following properties:
>> +    - #address-cells  - number of cells required to define a chip select
>> +                       address on the SPI bus.
>
> Hrm.  Should this (and "reg" in the child node) be required for SPI
> masters that have only one chip select?

I suppose it could be skipped, but I'd rather have it there for consistency

>
>> +    - max-speed       - (required) Maximum SPI clocking speed of device
>> in Hz
>
> The property name should include something "SPI", it's way too generic
> otherwise.

Good point; I'll change this to 'spi-max-speed'

>> +    - spi,cpol        - (optional) Device requires inverse clock polarity
>> +    - spi,cpha        - (optional) Device requires shifted clock phase
>
> Don't abbr the property names, there's nothing wrong with longer names.
> The names shouldn't start with "spi," either, "spi" isn't a vendor;
> how about "spi-inverse-clock-polarity" or similar?

Okay, but cpol and cpha are common abbreviations w.r.t. SPI devices.

>> +    - linux,modalias  - (optional, Linux specific) Force binding of SPI
>> device
>> +                       to a particular spi_device driver.  Useful for
>> changing
>> +                       driver binding between spidev and a kernel SPI
>> driver.
>
> This is a temporary workaround I hope?

Yeah, I'm kind of ashamed of this one.  I'll drop it.

g.

-- 
Grant Likely, B.Sc., P.Eng.
Secret Lab Technologies Ltd.
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