[PATCH v7 2/6] mfd: syscon: add a DT property to set value width
arnd at arndb.de
Fri Dec 4 08:02:53 PST 2015
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 at savoirfairelinux.com>
> > Acked-by: Rob Herring <robh at kernel.org>
Acked-by: Arnd Bergmann <arnd at arndb.de>
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