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f315a48131
Some I2C slave devices are read-only and don't even answer with NACK. For example FD65x segment LED controllers. Make them usable with i2c-gpio,sda-output-only that are already supported by Linux 6.3+. Signed-off-by: Alex Shumsky <alexthreed@gmail.com> Reviewed-by: Heiko Schocher <hs@denx.de>
43 lines
952 B
Text
43 lines
952 B
Text
I2C gpio device binding
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=======================
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Driver:
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- drivers/i2c/i2c-gpio.c
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Software i2c device-tree node properties:
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Required:
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* #address-cells = <1>;
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* #size-cells = <0>;
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* compatible = "i2c-gpio";
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* gpios = <sda ...>, <scl ...>;
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Optional:
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* i2c-gpio,delay-us = <5>;
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The resulting transfer speed can be adjusted by setting the delay[us]
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between gpio-toggle operations. Speed [Hz] = 1000000 / 4 * udelay[us],
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It not defined, then default is 5us (~50KHz).
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* i2c-gpio,deblock
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Run deblocking sequence when the driver gets probed.
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* i2c-gpio,scl-output-only;
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Set if SCL is an output only
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* i2c-gpio,sda-output-only;
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Set if SDA is an output only
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Example:
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i2c-gpio@1 {
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#address-cells = <1>;
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#size-cells = <0>;
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compatible = "i2c-gpio";
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gpios = <&gpd1 0 GPIO_ACTIVE_HIGH>, /* SDA */
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<&gpd1 1 GPIO_ACTIVE_HIGH>; /* CLK */
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i2c-gpio,delay-us = <5>;
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some_device@5 {
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compatible = "some_device";
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reg = <0x5>;
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...
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};
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};
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