linux-kernel - Re: [PATCH v2 3/5] mtd: spi-nor: cadence-quadspi: Add new binding to enable loop-back circuit

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Date:   Thu, 17 Aug 2017 17:00:56 -0500
From:   Rob Herring <robh@...nel.org>
To:     Vignesh R <vigneshr@...com>
Cc:     Marek Vasut <marek.vasut@...il.com>,
        Cyrille Pitchen <cyrille.pitchen@...ev4u.fr>,
        David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Boris Brezillon <boris.brezillon@...e-electrons.com>,
        Richard Weinberger <richard@....at>,
        linux-mtd@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2 3/5] mtd: spi-nor: cadence-quadspi: Add new binding to
 enable loop-back circuit

On Wed, Aug 16, 2017 at 10:20:51AM +0530, Vignesh R wrote:
> Cadence QSPI IP has a adapted loop-back circuit which can be enabled by
> setting BYPASS field to 0 in READCAPTURE register. It enables use of
> QSPI return clock to latch the data rather than the internal QSPI
> reference clock. For high speed operations, adapted loop-back circuit
> using QSPI return clock helps to increase data valid window.
> 
> Add DT parameter cdns,rclk-en to help enable adapted loop-back circuit
> for boards which do have QSPI return clock provided. Update binding
> documentation for the same.
> 
> Signed-off-by: Vignesh R <vigneshr@...com>
> ---
>  Documentation/devicetree/bindings/mtd/cadence-quadspi.txt | 3 +++
>  1 file changed, 3 insertions(+)

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