linux-kernel - Re: [PATCH v2 3/3] can: sja1000: of: add compatibility with Technologic Systems version

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Date:	Tue, 12 Jan 2016 08:55:38 +0100
From:	Marc Kleine-Budde <mkl@...gutronix.de>
To:	Damien Riegel <damien.riegel@...oirfairelinux.com>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	linux-can@...r.kernel.org
Cc:	Rob Herring <robh+dt@...nel.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>,
	kernel@...oirfairelinux.com
Subject: Re: [PATCH v2 3/3] can: sja1000: of: add compatibility with
 Technologic Systems version

On 12/24/2015 06:42 PM, Damien Riegel wrote:
> Technologic Systems provides an IP compatible with the SJA1000,
> instantiated in an FPGA. Because of some bus widths issue, access to
> registers is made through a "window" that works like this:
> 
>     base + 0x0: address to read/write
>     base + 0x2: 8-bit register value

Why do you use io{read,write}16 if it's a 8 bit register?

Marc

-- 
Pengutronix e.K.                  | Marc Kleine-Budde           |
Industrial Linux Solutions        | Phone: +49-231-2826-924     |
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Amtsgericht Hildesheim, HRA 2686  | http://www.pengutronix.de   |


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