linux-kernel - [PATCH v2 1/4] spi: dt-bindings: Introduce spi-mosi-idle-low flag

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Message-Id: <20230511231317.158214-2-bstruempfel@ultratronik.de>
Date:   Fri, 12 May 2023 01:13:14 +0200
From:   Boerge Struempfel <boerge.struempfel@...il.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     boerge.struempfel@...il.com, bstruempfel@...ratronik.de,
        andy.shevchenko@...il.com, Mark Brown <broonie@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        linux-spi@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: [PATCH v2 1/4] spi: dt-bindings: Introduce spi-mosi-idle-low flag

Some spi controller switch the mosi line to high, whenever they are
idle. This may not be desired in all use cases. For example neopixel
leds can get confused and flicker due to misinterpreting the idle state.
Therefore, we introduce a new spi-mode bit, with which the idle behaviour
can be overwritten on a per device basis.

Signed-off-by: Boerge Struempfel <bstruempfel@...ratronik.de>
---
 .../devicetree/bindings/spi/spi-peripheral-props.yaml       | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Documentation/devicetree/bindings/spi/spi-peripheral-props.yaml b/Documentation/devicetree/bindings/spi/spi-peripheral-props.yaml
index 782a014b63a76..46d5acc1fc232 100644
--- a/Documentation/devicetree/bindings/spi/spi-peripheral-props.yaml
+++ b/Documentation/devicetree/bindings/spi/spi-peripheral-props.yaml
@@ -34,6 +34,12 @@ properties:
     description:
       The device requires the chip select active high.
 
+  spi-mosi-idle-low:
+    $ref: /schemas/types.yaml#/definitions/flag
+    description:
+      The device requires the mosi line to be low when idle and the
+      chip select is asserted.
+
   spi-lsb-first:
     $ref: /schemas/types.yaml#/definitions/flag
     description:
-- 
2.25.1