linux-kernel - Re: [PATCH v7 2/6] mfd: syscon: add a DT property to set value width

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Message-ID: <1488444.chqN1XL3OQ@wuerfel>
Date:	Fri, 04 Dec 2015 17:02:53 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	Damien Riegel <damien.riegel@...oirfairelinux.com>,
	Rob Herring <robh@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	devicetree@...r.kernel.org, Russell King <linux@....linux.org.uk>,
	linux-watchdog@...r.kernel.org, Pawel Moll <pawel.moll@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Shawn Guo <shawnguo@...nel.org>, linux-kernel@...r.kernel.org,
	Wim Van Sebroeck <wim@...ana.be>,
	Guenter Roeck <linux@...ck-us.net>,
	Sascha Hauer <kernel@...gutronix.de>,
	Kumar Gala <galak@...eaurora.org>, kernel@...oirfairelinux.com,
	Lee Jones <lee.jones@...aro.org>,
	Samuel Ortiz <sameo@...ux.intel.com>
Subject: Re: [PATCH v7 2/6] mfd: syscon: add a DT property to set value width

On Wednesday 02 December 2015 18:21:02 Damien Riegel wrote:
> Lee, Arnd,
> 
> I had to make changes in this patch to address Rob's comments.
> reg-io-width is now in bytes while bus-width was a value in bits. Could
> you please review this patch ?


Ok, that's fine.

> 
> On Mon, Nov 30, 2015 at 01:00:15PM -0600, Rob Herring wrote:
> > On Mon, Nov 30, 2015 at 10:59:47AM -0500, Damien Riegel wrote:
> > > Currently syscon has a fixed configuration of 32 bits for register and
> > > values widths. In some cases, it would be desirable to be able to
> > > customize the value width.
> > > 
> > > For example, certain boards (like the ones manufactured by Technologic
> > > Systems) have a FPGA that is memory-mapped, but its registers are only
> > > 16-bit wide.
> > > 
> > > This patch adds an optional "reg-io-width" DT binding for syscon that
> > > allows to change the width for the data bus (i.e. val_bits). If this
> > > property is provided, it will also set the register stride to
> > > reg-io-width's value. If not provided, the default configuration is
> > > used.
> > > 
> > > Signed-off-by: Damien Riegel <damien.riegel@...oirfairelinux.com>
> > 
> > Acked-by: Rob Herring <robh@...nel.org>
> > 
> 

Acked-by: Arnd Bergmann <arnd@...db.de>
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