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dt-bindings: display: sitronix, st7735r: Remove spi-max-frequency limit

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The datasheet lists the minimum Serial clock cycle (Write) as 66ns which is
15MHz. Mostly it can do much better than that and is in fact often run at
32MHz. With a clever driver that runs configuration commands at a low speed
and only the pixel data at the maximum speed the configuration can't be
messed up by transfer errors and the speed is only limited by the amount of
pixel glitches that one is able to tolerate.

Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
Acked-by: Rob Herring <robh@kernel.org>
Acked-by: David Lechner <david@lechnology.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211124150757.17929-4-noralf@tronnes.org
This commit is contained in:
Noralf Trønnes 2021-11-24 16:07:54 +01:00
parent a2e8cbb277
commit df0a9e8d30
1 changed files with 1 additions and 3 deletions
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Documentation/devicetree/bindings/display/sitronix,st7735r.yaml
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@ -32,15 +32,13 @@ properties:
- okaya,rh128128t
- const: sitronix,st7715r
spi-max-frequency:
maximum: 32000000
dc-gpios:
maxItems: 1
description: Display data/command selection (D/CX)
backlight: true
reg: true
spi-max-frequency: true
reset-gpios: true
rotation: true