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Date: Tue, 16 Jun 2020 03:58:58 +0000
From: Anson Huang <anson.huang@....com>
To: Rob Herring <robh@...nel.org>
CC: Aisheng Dong <aisheng.dong@....com>,
"shawnguo@...nel.org" <shawnguo@...nel.org>,
"s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
"kernel@...gutronix.de" <kernel@...gutronix.de>,
"festevam@...il.com" <festevam@...il.com>,
"linux@...pel-privat.de" <linux@...pel-privat.de>,
"wolfram@...-dreams.de" <wolfram@...-dreams.de>,
"linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
dl-linux-imx <linux-imx@....com>
Subject: RE: [PATCH V2 3/3] dt-bindings: i2c: Convert imx i2c to json-schema
Hi, Rob
> Subject: Re: [PATCH V2 3/3] dt-bindings: i2c: Convert imx i2c to json-schema
>
> On Thu, Jun 04, 2020 at 09:49:18AM +0800, Anson Huang wrote:
> > 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@....com>
> > ---
> > Changes since V1:
> > - add "additionalProperties: false".
> > ---
> > Documentation/devicetree/bindings/i2c/i2c-imx.txt | 49 ---------
> > Documentation/devicetree/bindings/i2c/i2c-imx.yaml | 119
> > +++++++++++++++++++++
> > 2 files changed, 119 insertions(+), 49 deletions(-) delete mode
> > 100644 Documentation/devicetree/bindings/i2c/i2c-imx.txt
> > create mode 100644 Documentation/devicetree/bindings/i2c/i2c-imx.yaml
> >
> > diff --git a/Documentation/devicetree/bindings/i2c/i2c-imx.txt
> > b/Documentation/devicetree/bindings/i2c/i2c-imx.txt
> > deleted file mode 100644
> > index b967544..0000000
> > --- a/Documentation/devicetree/bindings/i2c/i2c-imx.txt
> > +++ /dev/null
> > @@ -1,49 +0,0 @@
> > -* Freescale Inter IC (I2C) and High Speed Inter IC (HS-I2C) for i.MX
> > -
> > -Required properties:
> > -- compatible :
> > - - "fsl,imx1-i2c" for I2C compatible with the one integrated on
> > i.MX1 SoC
> > - - "fsl,imx21-i2c" for I2C compatible with the one integrated on
> > i.MX21 SoC
> > - - "fsl,vf610-i2c" for I2C compatible with the one integrated on
> > Vybrid vf610 SoC
> > -- reg : Should contain I2C/HS-I2C registers location and length
> > -- interrupts : Should contain I2C/HS-I2C interrupt
> > -- clocks : Should contain the I2C/HS-I2C clock specifier
> > -
> > -Optional properties:
> > -- clock-frequency : Constains desired I2C/HS-I2C bus clock frequency in Hz.
> > - The absence of the property indicates the default frequency 100 kHz.
> > -- dmas: A list of two dma specifiers, one for each entry in dma-names.
> > -- dma-names: should contain "tx" and "rx".
> > -- scl-gpios: specify the gpio related to SCL pin
> > -- sda-gpios: specify the gpio related to SDA pin
> > -- pinctrl: add extra pinctrl to configure i2c pins to gpio function
> > for i2c
> > - bus recovery, call it "gpio" state
> > -
> > -Examples:
> > -
> > -i2c@...c4000 { /* I2C2 on i.MX51 */
> > - compatible = "fsl,imx51-i2c", "fsl,imx21-i2c";
> > - reg = <0x83fc4000 0x4000>;
> > - interrupts = <63>;
> > -};
> > -
> > -i2c@...38000 { /* HS-I2C on i.MX51 */
> > - compatible = "fsl,imx51-i2c", "fsl,imx21-i2c";
> > - reg = <0x70038000 0x4000>;
> > - interrupts = <64>;
> > - clock-frequency = <400000>;
> > -};
> > -
> > -i2c0: i2c@...66000 { /* i2c0 on vf610 */
> > - compatible = "fsl,vf610-i2c";
> > - reg = <0x40066000 0x1000>;
> > - interrupts =<0 71 0x04>;
> > - dmas = <&edma0 0 50>,
> > - <&edma0 0 51>;
> > - dma-names = "rx","tx";
> > - pinctrl-names = "default", "gpio";
> > - pinctrl-0 = <&pinctrl_i2c1>;
> > - pinctrl-1 = <&pinctrl_i2c1_gpio>;
> > - scl-gpios = <&gpio5 26 GPIO_ACTIVE_HIGH>;
> > - sda-gpios = <&gpio5 27 GPIO_ACTIVE_HIGH>;
> > -};
> > diff --git a/Documentation/devicetree/bindings/i2c/i2c-imx.yaml
> > b/Documentation/devicetree/bindings/i2c/i2c-imx.yaml
> > new file mode 100644
> > index 0000000..63cceab
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/i2c/i2c-imx.yaml
> > @@ -0,0 +1,119 @@
> > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) %YAML 1.2
> > +---
> > +$id:
> > +https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fdevi
> >
> +cetree.org%2Fschemas%2Fi2c%2Fi2c-imx.yaml%23&data=02%7C01%7C
> Anson
> >
> +.Huang%40nxp.com%7C943043d1a28548a7fd3308d8114efd9d%7C686ea1d
> 3bc2b4c6
> >
> +fa92cd99c5c301635%7C0%7C0%7C637278378260012996&sdata=VZfJ
> %2BLVtuB
> > +JOWy0e9riauncrE5UNozko4iP6tYm9y80%3D&reserved=0
> > +$schema:
> > +https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fdevi
> >
> +cetree.org%2Fmeta-schemas%2Fcore.yaml%23&data=02%7C01%7CAns
> on.Hua
> >
> +ng%40nxp.com%7C943043d1a28548a7fd3308d8114efd9d%7C686ea1d3bc2
> b4c6fa92
> >
> +cd99c5c301635%7C0%7C0%7C637278378260012996&sdata=ABISCsw
> dkJMA4ECe
> > +JE7wKsgzcwZYQS1dfVrxCAecLlY%3D&reserved=0
> > +
> > +title: Freescale Inter IC (I2C) and High Speed Inter IC (HS-I2C) for
> > +i.MX
> > +
> > +maintainers:
> > + - Wolfram Sang <wolfram@...-dreams.de>
> > +
> > +properties:
> > + compatible:
> > + oneOf:
> > + - const: fsl,imx1-i2c
> > + - const: fsl,imx21-i2c
> > + - const: fsl,vf610-i2c
> > + - items:
> > + - const: fsl,imx35-i2c
> > + - const: fsl,imx1-i2c
> > + - items:
> > + - enum:
> > + - fsl,imx25-i2c
> > + - fsl,imx27-i2c
> > + - fsl,imx31-i2c
> > + - fsl,imx50-i2c
> > + - fsl,imx51-i2c
> > + - fsl,imx53-i2c
> > + - fsl,imx6q-i2c
> > + - fsl,imx6sl-i2c
> > + - fsl,imx6sx-i2c
> > + - fsl,imx6sll-i2c
> > + - fsl,imx6ul-i2c
> > + - fsl,imx7s-i2c
> > + - fsl,imx8mq-i2c
> > + - fsl,imx8mm-i2c
> > + - fsl,imx8mn-i2c
> > + - fsl,imx8mp-i2c
> > + - const: fsl,imx21-i2c
> > +
> > + reg:
> > + maxItems: 1
> > +
> > + interrupts:
> > + maxItems: 1
> > +
> > + clocks:
> > + maxItems: 1
> > +
> > + clock-names:
> > + const: ipg
> > +
> > + clock-frequency:
> > + $ref: /schemas/types.yaml#/definitions/uint32
>
> Already has a type.
Will remove the type and just use enum for it, it ONLY supports 100KHz/400KHz.
>
> > + description: |
> > + Constains desired I2C/HS-I2C bus clock frequency in Hz.
> > + The absence of the property indicates the default frequency 100 kHz.
> > + default: 100000
>
> The bus default is up to 3MHz. Is that valid here?
No, it should be either 100KHz or 400KHz, so far on i.MX I2C, ONLY 100KHz/400KHz are
supported/tested.
>
> > +
> > + dmas:
> > + items:
> > + - description: DMA controller phandle and request line for RX
> > + - description: DMA controller phandle and request line for TX
> > +
> > + dma-names:
> > + items:
> > + - const: rx
> > + - const: tx
> > +
> > + sda-gpios:
> > + $ref: '/schemas/types.yaml#/definitions/phandle'
>
> *-gpios already has a type
Will remove -gpios' type/description as it is already defined in i2c-gpio.yaml.
>
> > + description: |
> > + gpio used for the sda signal, this should be flagged as
> > + active high using open drain with
> (GPIO_ACTIVE_HIGH|GPIO_OPEN_DRAIN)
> > + from <dt-bindings/gpio/gpio.h> since the signal is by definition
> > + open drain.
> > + maxItems: 1
> > +
> > + scl-gpios:
> > + $ref: '/schemas/types.yaml#/definitions/phandle'
> > + description: |
> > + gpio used for the scl signal, this should be flagged as
> > + active high using open drain with
> (GPIO_ACTIVE_HIGH|GPIO_OPEN_DRAIN)
> > + from <dt-bindings/gpio/gpio.h> since the signal is by definition
> > + open drain.
> > + maxItems: 1
> > +
> > +required:
> > + - compatible
> > + - reg
> > + - interrupts
> > + - clocks
> > +
> > +additionalProperties: false
> > +
> > +examples:
> > + - |
> > + #include <dt-bindings/clock/imx5-clock.h>
> > + #include <dt-bindings/clock/vf610-clock.h>
> > + #include <dt-bindings/gpio/gpio.h>
> > + #include <dt-bindings/interrupt-controller/arm-gic.h>
> > +
> > + i2c@...c4000 {
> > + compatible = "fsl,imx51-i2c", "fsl,imx21-i2c";
> > + reg = <0x83fc4000 0x4000>;
> > + interrupts = <63>;
> > + clocks = <&clks IMX5_CLK_I2C2_GATE>;
> > + };
> > +
> > + i2c@...66000 {
> > + compatible = "fsl,vf610-i2c";
> > + reg = <0x40066000 0x1000>;
> > + interrupts = <71 IRQ_TYPE_LEVEL_HIGH>;
> > + clocks = <&clks VF610_CLK_I2C0>;
> > + clock-names = "ipg";
> > + dmas = <&edma0 0 50>,
> > + <&edma0 0 51>;
> > + dma-names = "rx","tx";
>
> space ^
Will fix it in V3.
Thanks,
Anson
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