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

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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@ti.com>
---
 Documentation/devicetree/bindings/mtd/cadence-quadspi.txt | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Documentation/devicetree/bindings/mtd/cadence-quadspi.txt b/Documentation/devicetree/bindings/mtd/cadence-quadspi.txt
index 7dbe3bd9ac56..bb2075df9b38 100644
--- a/Documentation/devicetree/bindings/mtd/cadence-quadspi.txt
+++ b/Documentation/devicetree/bindings/mtd/cadence-quadspi.txt
@@ -16,6 +16,9 @@ Required properties:
 
 Optional properties:
 - cdns,is-decoded-cs : Flag to indicate whether decoder is used or not.
+- cdns,rclk-en : Flag to indicate that QSPI return clock is used to latch
+  the read data rather than the QSPI clock. Make sure that QSPI return
+  clock is populated on the board before using this property.
 
 Optional subnodes:
 Subnodes of the Cadence Quad SPI controller are spi slave nodes with additional
-- 
2.14.1

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[PATCH v2 0/5] K2G: Add QSPI support Vignesh R <vigneshr@ti.com> - 2017-08-16 07:00 +0200
  [PATCH v2 1/5] mtd: spi-nor: cadence-quadspi: Add TI 66AK2G SoC specific compatible Vignesh R <vigneshr@ti.com> - 2017-08-16 07:00 +0200
    Re: [PATCH v2 1/5] mtd: spi-nor: cadence-quadspi: Add TI 66AK2G SoC  specific compatible Rob Herring <robh@kernel.org> - 2017-08-18 00:10 +0200
  [PATCH v2 3/5] mtd: spi-nor: cadence-quadspi: Add new binding to enable loop-back circuit Vignesh R <vigneshr@ti.com> - 2017-08-16 07:00 +0200
    Re: [PATCH v2 3/5] mtd: spi-nor: cadence-quadspi: Add new binding to  enable loop-back circuit Rob Herring <robh@kernel.org> - 2017-08-18 00:10 +0200

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