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dt-bindings: i2c: i2c-gpio: Add support for named gpios
The current i2c-gpio DT bindings use a single unnamed "gpios" property to refer to the SDA and SCL signal lines by index. This is error-prone for the casual DT writer and reviewer, as one has to look up the order in the DT bindings. Fix this by amending the DT bindings to use two separate named gpios properties, and deprecate the old unnamed variant. Take this opportunity to clearly deprecate the "i2c-gpio,sda-open-drain" and "i2c-gpio,scl-open-drain" flags as well. The commit describes in detail what these flags actually mean, and why they should not be used in new device trees. Cc: devicetree@vger.kernel.org Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> [Augmented to what I and Rob would like] Tested-by: Geert Uytterhoeven <geert+renesas@glider.be> Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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@ -2,25 +2,39 @@ Device-Tree bindings for i2c gpio driver
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Required properties:
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- compatible = "i2c-gpio";
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- gpios: sda and scl gpio
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- sda-gpios: gpio used for the sda signal, this should be flagged as
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active high using open drain with (GPIO_ACTIVE_HIGH|GPIO_OPEN_DRAIN)
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from <dt-bindings/gpio/gpio.h> since the signal is by definition
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open drain.
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- scl-gpios: gpio used for the scl signal, this should be flagged as
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active high using open drain with (GPIO_ACTIVE_HIGH|GPIO_OPEN_DRAIN)
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from <dt-bindings/gpio/gpio.h> since the signal is by definition
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open drain.
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Optional properties:
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- i2c-gpio,sda-open-drain: sda as open drain
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- i2c-gpio,scl-open-drain: scl as open drain
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- i2c-gpio,scl-output-only: scl as output only
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- i2c-gpio,delay-us: delay between GPIO operations (may depend on each platform)
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- i2c-gpio,timeout-ms: timeout to get data
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Deprecated properties, do not use in new device tree sources:
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- gpios: sda and scl gpio, alternative for {sda,scl}-gpios
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- i2c-gpio,sda-open-drain: this means that something outside of our
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control has put the GPIO line used for SDA into open drain mode, and
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that something is not the GPIO chip. It is essentially an
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inconsistency flag.
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- i2c-gpio,scl-open-drain: this means that something outside of our
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control has put the GPIO line used for SCL into open drain mode, and
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that something is not the GPIO chip. It is essentially an
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inconsistency flag.
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Example nodes:
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#include <dt-bindings/gpio/gpio.h>
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i2c@0 {
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compatible = "i2c-gpio";
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gpios = <&pioA 23 0 /* sda */
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&pioA 24 0 /* scl */
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>;
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i2c-gpio,sda-open-drain;
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i2c-gpio,scl-open-drain;
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sda-gpios = <&pioA 23 (GPIO_ACTIVE_HIGH|GPIO_OPEN_DRAIN)>;
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scl-gpios = <&pioA 24 (GPIO_ACTIVE_HIGH|GPIO_OPEN_DRAIN)>;
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i2c-gpio,delay-us = <2>; /* ~100 kHz */
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#address-cells = <1>;
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#size-cells = <0>;
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