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From:   Alexander Stein <alexander.stein@ew.tq-group.com>
To:     Miquel Raynal <miquel.raynal@bootlin.com>,
        Richard Weinberger <richard@nod.at>,
        Vignesh Raghavendra <vigneshr@ti.com>,
        Rob Herring <robh+dt@kernel.org>,
        Pratyush Yadav <p.yadav@ti.com>,
        Michael Walle <michael@walle.cc>,
        Tudor Ambarus <tudor.ambarus@microchip.com>
Cc:     Alexander Stein <alexander.stein@ew.tq-group.com>,
        linux-mtd@lists.infradead.org, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org
Subject: [PATCH v2 1/2] dt-bindings: mtd: spi-nor: Add output-driver-strength property
Date:   Tue, 12 Oct 2021 08:17:03 +0200
Message-Id: <20211012061704.284214-1-alexander.stein@ew.tq-group.com>
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This property is for optimizing output voltage impedance and is
specific to each board. It overwrites the default set by the flash
device. Various flash devices support different impedances.

Signed-off-by: Alexander Stein <alexander.stein@ew.tq-group.com>
---
Changes in v2:
* Updated the property description and the commit message accordingly

 Documentation/devicetree/bindings/mtd/jedec,spi-nor.yaml | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/Documentation/devicetree/bindings/mtd/jedec,spi-nor.yaml b/Documentation/devicetree/bindings/mtd/jedec,spi-nor.yaml
index ed590d7c6e37..4c3c506a8853 100644
--- a/Documentation/devicetree/bindings/mtd/jedec,spi-nor.yaml
+++ b/Documentation/devicetree/bindings/mtd/jedec,spi-nor.yaml
@@ -72,6 +72,14 @@ properties:
       be used on such systems, to denote the absence of a reliable reset
       mechanism.
 
+  output-driver-strength:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description:
+      Output driver strength in ohms which optimizes the impedance at Vcc/2
+      output voltage. This property overwrites the default set by the flash
+      device. This is board specific and should be determined by the
+      manufacturer. Various flash devices support different impedances.
+
   label: true
 
   partitions:
-- 
2.25.1