From: Alexander Stein <Alexander.Stein@tq-systems.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 1/2] dt-bindings: mtd: spi-nor: Add output-driver-strength property
Date: Mon, 4 Oct 2021 13:15:28 +0200 [thread overview]
Message-ID: <20211004111529.211089-1-Alexander.Stein@tq-systems.com> (raw)
From: Alexander Stein <alexander.stein@ew.tq-group.com>
This property is for optimizing output voltage impedance and is
specific to each board.
Signed-off-by: Alexander Stein <alexander.stein@ew.tq-group.com>
---
I checked Micron and Macronix datasheets. Both have similar but not
identical supported values. Also the register locations are different.
For those reasons I decided to specify the Ohms value directly and let
the device specfic driver figure out if it is supported where to write
it to.
BTW: Are the Ohm values and the corresponding register bits standardized
somewhere?
Documentation/devicetree/bindings/mtd/jedec,spi-nor.yaml | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/Documentation/devicetree/bindings/mtd/jedec,spi-nor.yaml b/Documentation/devicetree/bindings/mtd/jedec,spi-nor.yaml
index ed590d7c6e37..7d7f20a741b5 100644
--- a/Documentation/devicetree/bindings/mtd/jedec,spi-nor.yaml
+++ b/Documentation/devicetree/bindings/mtd/jedec,spi-nor.yaml
@@ -72,6 +72,12 @@ 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.
+
label: true
partitions:
--
2.25.1
next reply other threads:[~2021-10-04 11:15 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-04 11:15 Alexander Stein [this message]
2021-10-04 11:15 ` [PATCH 2/2] mtd: spi-nor: micron-st: Add support for output-driver-strength Alexander Stein
2021-10-04 11:26 ` Tudor.Ambarus
2021-10-04 11:26 ` Tudor.Ambarus
2021-10-08 11:18 ` Pratyush Yadav
2021-10-08 11:18 ` Pratyush Yadav
2021-10-04 11:25 ` [PATCH 1/2] dt-bindings: mtd: spi-nor: Add output-driver-strength property Tudor.Ambarus
2021-10-04 11:25 ` Tudor.Ambarus
2021-10-05 12:26 ` Rob Herring
2021-10-05 12:26 ` Rob Herring
2021-10-12 12:52 ` Rob Herring
2021-10-12 12:52 ` Rob Herring
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