dt-bindings: i2c: Convert imx i2c to json-schema
Convert the i.MX I2C binding to DT schema format using json-schema, some improvements applied, such as update example based on latest DT file, add more compatible for existing SoCs, and remove unnecessary common property "pinctrl". Signed-off-by: Anson Huang <Anson.Huang@nxp.com> Link: https://lore.kernel.org/r/1592279454-32551-2-git-send-email-Anson.Huang@nxp.com Signed-off-by: Rob Herring <robh@kernel.org>
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Anson Huang
Rob Herring
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* Freescale Inter IC (I2C) and High Speed Inter IC (HS-I2C) for i.MX
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Required properties:
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- compatible :
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- "fsl,imx1-i2c" for I2C compatible with the one integrated on i.MX1 SoC
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- "fsl,imx21-i2c" for I2C compatible with the one integrated on i.MX21 SoC
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- "fsl,vf610-i2c" for I2C compatible with the one integrated on Vybrid vf610 SoC
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- reg : Should contain I2C/HS-I2C registers location and length
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- interrupts : Should contain I2C/HS-I2C interrupt
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- clocks : Should contain the I2C/HS-I2C clock specifier
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Optional properties:
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- clock-frequency : Constains desired I2C/HS-I2C bus clock frequency in Hz.
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The absence of the property indicates the default frequency 100 kHz.
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- dmas: A list of two dma specifiers, one for each entry in dma-names.
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- dma-names: should contain "tx" and "rx".
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- scl-gpios: specify the gpio related to SCL pin
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- sda-gpios: specify the gpio related to SDA pin
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- pinctrl: add extra pinctrl to configure i2c pins to gpio function for i2c
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bus recovery, call it "gpio" state
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Examples:
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i2c@83fc4000 { /* I2C2 on i.MX51 */
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compatible = "fsl,imx51-i2c", "fsl,imx21-i2c";
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reg = <0x83fc4000 0x4000>;
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interrupts = <63>;
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};
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i2c@70038000 { /* HS-I2C on i.MX51 */
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compatible = "fsl,imx51-i2c", "fsl,imx21-i2c";
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reg = <0x70038000 0x4000>;
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interrupts = <64>;
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clock-frequency = <400000>;
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};
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i2c0: i2c@40066000 { /* i2c0 on vf610 */
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compatible = "fsl,vf610-i2c";
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reg = <0x40066000 0x1000>;
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interrupts =<0 71 0x04>;
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dmas = <&edma0 0 50>,
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<&edma0 0 51>;
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dma-names = "rx","tx";
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pinctrl-names = "default", "gpio";
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pinctrl-0 = <&pinctrl_i2c1>;
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pinctrl-1 = <&pinctrl_i2c1_gpio>;
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scl-gpios = <&gpio5 26 GPIO_ACTIVE_HIGH>;
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sda-gpios = <&gpio5 27 GPIO_ACTIVE_HIGH>;
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};
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103
Documentation/devicetree/bindings/i2c/i2c-imx.yaml
Normal file
103
Documentation/devicetree/bindings/i2c/i2c-imx.yaml
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# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
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%YAML 1.2
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---
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$id: http://devicetree.org/schemas/i2c/i2c-imx.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: Freescale Inter IC (I2C) and High Speed Inter IC (HS-I2C) for i.MX
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maintainers:
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- Wolfram Sang <wolfram@the-dreams.de>
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properties:
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compatible:
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oneOf:
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- const: fsl,imx1-i2c
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- const: fsl,imx21-i2c
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- const: fsl,vf610-i2c
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- items:
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- const: fsl,imx35-i2c
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- const: fsl,imx1-i2c
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- items:
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- enum:
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- fsl,imx25-i2c
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- fsl,imx27-i2c
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- fsl,imx31-i2c
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- fsl,imx50-i2c
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- fsl,imx51-i2c
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- fsl,imx53-i2c
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- fsl,imx6q-i2c
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- fsl,imx6sl-i2c
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- fsl,imx6sx-i2c
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- fsl,imx6sll-i2c
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- fsl,imx6ul-i2c
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- fsl,imx7s-i2c
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- fsl,imx8mq-i2c
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- fsl,imx8mm-i2c
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- fsl,imx8mn-i2c
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- fsl,imx8mp-i2c
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- const: fsl,imx21-i2c
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reg:
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maxItems: 1
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interrupts:
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maxItems: 1
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clocks:
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maxItems: 1
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clock-names:
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const: ipg
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clock-frequency:
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enum: [ 100000, 400000 ]
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dmas:
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items:
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- description: DMA controller phandle and request line for RX
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- description: DMA controller phandle and request line for TX
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dma-names:
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items:
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- const: rx
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- const: tx
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sda-gpios:
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maxItems: 1
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scl-gpios:
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maxItems: 1
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required:
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- compatible
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- reg
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- interrupts
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- clocks
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additionalProperties: false
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examples:
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- |
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#include <dt-bindings/clock/imx5-clock.h>
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#include <dt-bindings/clock/vf610-clock.h>
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#include <dt-bindings/gpio/gpio.h>
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#include <dt-bindings/interrupt-controller/arm-gic.h>
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i2c@83fc4000 {
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compatible = "fsl,imx51-i2c", "fsl,imx21-i2c";
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reg = <0x83fc4000 0x4000>;
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interrupts = <63>;
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clocks = <&clks IMX5_CLK_I2C2_GATE>;
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};
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i2c@40066000 {
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compatible = "fsl,vf610-i2c";
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reg = <0x40066000 0x1000>;
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interrupts = <71 IRQ_TYPE_LEVEL_HIGH>;
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clocks = <&clks VF610_CLK_I2C0>;
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clock-names = "ipg";
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dmas = <&edma0 0 50>,
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<&edma0 0 51>;
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dma-names = "rx", "tx";
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};
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