linux-kernel - Re: [PATCH 1/2] can: sja1000: add documentation for Technologic Systems version

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Date:	Tue, 22 Dec 2015 12:28:52 -0600
From:	Rob Herring <robh@...nel.org>
To:	Damien Riegel <damien.riegel@...oirfairelinux.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	netdev <netdev@...r.kernel.org>, linux-can@...r.kernel.org,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Wolfgang Grandegger <wg@...ndegger.com>,
	Marc Kleine-Budde <mkl@...gutronix.de>,
	kernel@...oirfairelinux.com
Subject: Re: [PATCH 1/2] can: sja1000: add documentation for Technologic
 Systems version

On Mon, Dec 21, 2015 at 9:09 AM, Damien Riegel
<damien.riegel@...oirfairelinux.com> wrote:
> On Sat, Dec 19, 2015 at 09:37:42PM -0600, Rob Herring wrote:
>> On Fri, Dec 18, 2015 at 03:17:24PM -0500, Damien Riegel wrote:
>> > This commit adds documentation for the Technologic Systems version of
>> > SJA1000. The difference with the NXP version is in the way the registers
>> > are accessed.
>> >
>> > Signed-off-by: Damien Riegel <damien.riegel@...oirfairelinux.com>
>> > ---
>> >  Documentation/devicetree/bindings/net/can/sja1000.txt | 3 ++-
>> >  1 file changed, 2 insertions(+), 1 deletion(-)
>> >
>> > diff --git a/Documentation/devicetree/bindings/net/can/sja1000.txt b/Documentation/devicetree/bindings/net/can/sja1000.txt
>> > index b4a6d53..7a158d5 100644
>> > --- a/Documentation/devicetree/bindings/net/can/sja1000.txt
>> > +++ b/Documentation/devicetree/bindings/net/can/sja1000.txt
>> > @@ -2,7 +2,7 @@ Memory mapped SJA1000 CAN controller from NXP (formerly Philips)
>> >
>> >  Required properties:
>> >
>> > -- compatible : should be "nxp,sja1000".
>> > +- compatible : should be one of "nxp,sja1000", "technologic,sja1000".
>> >
>> >  - reg : should specify the chip select, address offset and size required
>> >     to map the registers of the SJA1000. The size is usually 0x80.
>> > @@ -14,6 +14,7 @@ Optional properties:
>> >
>> >  - reg-io-width : Specify the size (in bytes) of the IO accesses that
>> >     should be performed on the device.  Valid value is 1, 2 or 4.
>> > +   Must be set to 2 for technologic version.
>> >     Default to 1 (8 bits).
>>
>> Really, this should default to 2 for technologic version and not be
>> required.
>
> Would something along the line of "This property is <not used|ignored>
> for technologic version." be more appropriate?

Yes, exactly.

Rob
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