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| author | Heiner Kallweit <hkallweit1@gmail.com> | 2023-01-19 00:51:58 +0300 |
|---|---|---|
| committer | Wolfram Sang <wsa@kernel.org> | 2023-01-24 01:15:42 +0300 |
| commit | a00bb94c7bde3e470bbb517650293800cd20e271 (patch) | |
| tree | b3208183c1018f231315aa2813bd66fec8d5e910 /Documentation/devicetree/bindings/i2c/i2c-gpio.yaml | |
| parent | f531ecf71a70d3dce5a36ebcd6b27078a1e86be8 (diff) | |
| download | linux-a00bb94c7bde3e470bbb517650293800cd20e271.tar.xz | |
dt-bindings: i2c: gpio: Add properties for dealing with write-only SDA/SCL w/o pullup
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 add properties for not using open-drain. For write-only SCL
we have a property already, add one for write-only SDA.
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
Diffstat (limited to 'Documentation/devicetree/bindings/i2c/i2c-gpio.yaml')
| -rw-r--r-- | Documentation/devicetree/bindings/i2c/i2c-gpio.yaml | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/i2c/i2c-gpio.yaml b/Documentation/devicetree/bindings/i2c/i2c-gpio.yaml index e0d76d5eb103..afd4925c2a7d 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 @@ -63,6 +67,28 @@ properties: GPIO line used for SCL into open drain mode, and that something is not the GPIO chip. It is essentially an inconsistency flag. + i2c-gpio,sda-has-no-pullup: + type: boolean + description: sda is used in a non-compliant way and has no pull-up. + Therefore disable open-drain. This property is mutually-exclusive + with i2c-gpio,sda-open-drain. + + i2c-gpio,scl-has-no-pullup: + type: boolean + description: scl is used in a non-compliant way and has no pull-up. + Therefore disable open-drain. This property is mutually-exclusive + with i2c-gpio,scl-open-drain. + +dependencies: + i2c-gpio,sda-has-no-pullup: + not: + required: + - i2c-gpio,sda-open-drain + i2c-gpio,scl-has-no-pullup: + not: + required: + - i2c-gpio,scl-open-drain + required: - compatible - sda-gpios |