linux-kernel - [PATCH 1/3] dt-bindings: add "reduced-width" property for Armada XP SDRAM controller

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Message-Id: <20170806223006.14231-2-chris.packham@alliedtelesis.co.nz>
Date:   Mon,  7 Aug 2017 10:30:04 +1200
From:   Chris Packham <chris.packham@...iedtelesis.co.nz>
To:     robh+dt@...nel.org, gregory.clement@...e-electrons.com,
        bp@...en8.de, jlu@...gutronix.de
Cc:     Chris Packham <chris.packham@...iedtelesis.co.nz>,
        Mark Rutland <mark.rutland@....com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/3] dt-bindings: add "reduced-width" property for Armada XP SDRAM controller

Some SoC implementations that use this controller have a reduced pin
count so the meaning of "full" and "half" with change.

Signed-off-by: Chris Packham <chris.packham@...iedtelesis.co.nz>
---
 .../bindings/memory-controllers/mvebu-sdram-controller.txt          | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Documentation/devicetree/bindings/memory-controllers/mvebu-sdram-controller.txt b/Documentation/devicetree/bindings/memory-controllers/mvebu-sdram-controller.txt
index 89657d1d4cd4..3041868321c8 100644
--- a/Documentation/devicetree/bindings/memory-controllers/mvebu-sdram-controller.txt
+++ b/Documentation/devicetree/bindings/memory-controllers/mvebu-sdram-controller.txt
@@ -13,6 +13,12 @@ Required properties:
  - reg: a resource specifier for the register space, which should
    include all SDRAM controller registers as per the datasheet.
 
+Optional properties:
+ - marvell,reduced-width: some SoCs that use this SDRAM controller have
+   a reduced pin count. On such systems "full" width is 32-bits and
+   "half" width is 16-bits. Set this property to indicate that the SoC
+   used is such a system.
+
 Example:
 
 sdramc@...0 {
-- 
2.13.0