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 [thread overview]
Message-ID: <20211012061704.284214-1-alexander.stein@ew.tq-group.com> (raw)
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
next reply other threads:[~2021-10-12 6:17 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-12 6:17 Alexander Stein [this message]
2021-10-12 6:17 ` [PATCH v2 2/2] mtd: spi-nor: micron-st: Add support for output-driver-strength for MT25Q Alexander Stein
2021-10-12 7:48 ` [PATCH v2 1/2] dt-bindings: mtd: spi-nor: Add output-driver-strength property Michael Walle
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