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:

quoted

On Mon, Nov 30, 2015 at 10:59:47AM -0500, Damien Riegel wrote:

quoted

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 <redacted>

Acked-by: Rob Herring <robh@kernel.org>

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