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[2/2] dt: snps, dw-apb-ssi: Describe 16 bit data register usage limitations

Message ID 1434703435-25198-2-git-send-email-michael@smart-africa.com
State Needs Review / ACK, archived
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Commit Message

Michael van der Westhuizen June 19, 2015, 8:43 a.m. UTC
This change documents a new property for the snps,dw-apb-ssi device,
allowing an implementer to interact with the SPI controller data
register in 16 bit mode only.  This supports a change that unbreaks
this driver on picoXcell platforms.

Signed-off-by: Michael van der Westhuizen <michael@smart-africa.com>
---
 Documentation/devicetree/bindings/spi/snps,dw-apb-ssi.txt | 3 +++
 1 file changed, 3 insertions(+)
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Patch

diff --git a/Documentation/devicetree/bindings/spi/snps,dw-apb-ssi.txt b/Documentation/devicetree/bindings/spi/snps,dw-apb-ssi.txt
index bd99193..3b2a86f 100644
--- a/Documentation/devicetree/bindings/spi/snps,dw-apb-ssi.txt
+++ b/Documentation/devicetree/bindings/spi/snps,dw-apb-ssi.txt
@@ -10,6 +10,9 @@  Required properties:
 Optional properties:
 - cs-gpios : Specifies the gpio pis to be used for chipselects.
 - num-cs : The number of chipselects. If omitted, this will default to 4.
+- snps,data-io-16bit : A boolean property that, when present, causes
+  the driver to interact with the data register using 16 bit I/O instead
+  of the default 32 bit I/O.
 
 Child nodes as per the generic SPI binding.