linux-kernel - Re: [PATCH v4 2/5] mfd: syscon: add a DT property to set value width

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Message-ID: <4954077.yFyHuebvEs@wuerfel>
Date:	Mon, 23 Nov 2015 16:19:30 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Damien Riegel <damien.riegel@...oirfairelinux.com>
Cc:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-watchdog@...r.kernel.org, Lee Jones <lee.jones@...aro.org>,
	robh+dt@...nel.org, shawnguo@...nel.org, kernel@...gutronix.de,
	wim@...ana.be, sameo@...ux.intel.com, dinh.linux@...il.com,
	linux@...ck-us.net, kernel@...oirfairelinux.com
Subject: Re: [PATCH v4 2/5] mfd: syscon: add a DT property to set value width

On Monday 23 November 2015 10:17:38 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 "bus-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 adjust the register stride to
> bus-width / 8. If not provided, the default configuration is used.
> 
> Signed-off-by: Damien Riegel <damien.riegel@...oirfairelinux.com>
> 

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