linux-kernel - [PATCH v2 1/2] dt-bindings: mtd: spi-nor: Add output-driver-strength property

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Message-Id: <20211012061704.284214-1-alexander.stein@ew.tq-group.com>
Date:   Tue, 12 Oct 2021 08:17:03 +0200
From:   Alexander Stein <alexander.stein@...tq-group.com>
To:     Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        Rob Herring <robh+dt@...nel.org>,
        Pratyush Yadav <p.yadav@...com>,
        Michael Walle <michael@...le.cc>,
        Tudor Ambarus <tudor.ambarus@...rochip.com>
Cc:     Alexander Stein <alexander.stein@...tq-group.com>,
        linux-mtd@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 1/2] dt-bindings: mtd: spi-nor: Add output-driver-strength property

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@...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