linux-kernel - Re: [PATCH 2/7] mtd: spi-nor: cadence-quadspi: Add support to enable loopback clock circuit

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Date:   Wed, 9 Aug 2017 19:10:21 -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>,
        Santosh Shilimkar <ssantosh@...nel.org>,
        David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        linux-mtd@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 2/7] mtd: spi-nor: cadence-quadspi: Add support to enable
 loopback clock circuit

On Tue, Aug 01, 2017 at 10:24:29AM +0530, Vignesh R wrote:
> Cadence QSPI IP has a adapted loopback 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 loopback circuit
> using QSPI return clock helps to increase data valid window.
> 
> Add DT parameter cdns,rclk-en to help enable adapted loopback circuit
> for boards which do have QSPI return clock provided.
> This patch also modifies cqspi_readdata_capture() function's bypass
> parameter to bool to match how its used in the function.
> 
> Signed-off-by: Vignesh R <vigneshr@...com>
> ---
>  Documentation/devicetree/bindings/mtd/cadence-quadspi.txt | 3 +++
>  drivers/mtd/spi-nor/cadence-quadspi.c                     | 8 ++++++--
>  2 files changed, 9 insertions(+), 2 deletions(-)

Please separate bindings to a separate patch or patches.

Rob