There are slave devices that understand I2C but have read-only
SDA and SCL. Examples are FD650 7-segment LED controller and
its derivatives. Typical board designs don't even have a
pull-up for both pins. Therefore don't enforce open-drain
if SDA and SCL both are unidirectional. This patch makes
i2c-gpio usable with such devices, based on new DT property
i2c-gpio,sda-output-only.
Reviewed-by: Rob Herring <robh@xxxxxxxxxx>
Signed-off-by: Heiner Kallweit <hkallweit1@xxxxxxxxx>
---
Documentation/devicetree/bindings/i2c/i2c-gpio.yaml | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/Documentation/devicetree/bindings/i2c/i2c-gpio.yaml b/Documentation/devicetree/bindings/i2c/i2c-gpio.yaml
index e0d76d5eb..fd84a60d9 100644
--- a/Documentation/devicetree/bindings/i2c/i2c-gpio.yaml
+++ b/Documentation/devicetree/bindings/i2c/i2c-gpio.yaml
@@ -33,6 +33,10 @@ properties:
open drain.
maxItems: 1
+ i2c-gpio,sda-output-only:
+ description: sda as output only
+ type: boolean
+
i2c-gpio,scl-output-only:
description: scl as output only
type: boolean
--
2.39.0
