linux-kernel - Re: [PATCH v2 1/1] dt-bindings: aspeed-i2c: Convert txt to yaml format

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Date:   Fri, 28 May 2021 09:44:17 +0800
From:   Jamin Lin <jamin_lin@...eedtech.com>
To:     Andrew Jeffery <andrew@...id.au>
CC:     Rob Herring <robh+dt@...nel.org>, Joel Stanley <joel@....id.au>,
        "Brendan Higgins" <brendanhiggins@...gle.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Rayn Chen <rayn_chen@...eedtech.com>,
        "open list:I2C SUBSYSTEM HOST DRIVERS" <linux-i2c@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "moderated list:ARM/ASPEED MACHINE SUPPORT" 
        <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:ARM/ASPEED MACHINE SUPPORT" 
        <linux-aspeed@...ts.ozlabs.org>,
        open list <linux-kernel@...r.kernel.org>,
        "moderated list:ARM/ASPEED I2C DRIVER" <openbmc@...ts.ozlabs.org>,
        Ryan Chen <ryan_chen@...eedtech.com>,
        "Chin-Ting Kuo" <chin-ting_kuo@...eedtech.com>,
        Troy Lee <troy_lee@...eedtech.com>,
        Steven Lee <steven_lee@...eedtech.com>
Subject: Re: [PATCH v2 1/1] dt-bindings: aspeed-i2c: Convert txt to yaml
 format

The 05/27/2021 23:20, Andrew Jeffery wrote:
> 
> 
> On Thu, 27 May 2021, at 19:55, Jamin Lin wrote:
> > Convert aspeed i2c to yaml.
> > 
> > Signed-off-by: Jamin Lin <jamin_lin@...eedtech.com>
> > ---
> >  .../devicetree/bindings/i2c/aspeed,i2c.yaml   | 86 +++++++++++++++++++
> >  .../devicetree/bindings/i2c/i2c-aspeed.txt    | 49 -----------
> >  2 files changed, 86 insertions(+), 49 deletions(-)
> >  create mode 100644 Documentation/devicetree/bindings/i2c/aspeed,i2c.yaml
> >  delete mode 100644 Documentation/devicetree/bindings/i2c/i2c-aspeed.txt
> > 
> > diff --git a/Documentation/devicetree/bindings/i2c/aspeed,i2c.yaml 
> > b/Documentation/devicetree/bindings/i2c/aspeed,i2c.yaml
> > new file mode 100644
> > index 000000000000..1f7064d77708
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/i2c/aspeed,i2c.yaml
> > @@ -0,0 +1,86 @@
> > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/i2c/aspeed,i2c.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: ASPEED I2C on the AST24XX, AST25XX, and AST26XX SoCs Device 
> > Tree Bindings
> > +
> > +maintainers:
> > +  - Rayn Chen <rayn_chen@...eedtech.com>
> > +
> > +allOf:
> > +  - $ref: /schemas/i2c/i2c-controller.yaml#
> > +
> > +properties:
> > +  compatible:
> > +    enum:
> > +      - aspeed,ast2400-i2c-bus
> > +      - aspeed,ast2500-i2c-bus
> > +      - aspeed,ast2600-i2c-bus
> > +
> > +  "#size-cells":
> > +    const: 0
> > +
> > +  "#address-cells":
> > +    const: 1
> > +
> > +  reg:
> > +    minItems: 1
> > +    maxItems: 2
> > +    items:
> > +      - description: address offset and range of bus
> > +      - description: address offset and range of bus buffer
> > +
> > +  interrupts:
> > +    maxItems: 1
> > +    description: interrupt number
> > +
> > +  clocks:
> > +    maxItems: 1
> > +    description:
> > +      root clock of bus, should reference the APB
> > +      clock in the second cell
> > +
> > +  reset:
> > +    maxItems: 1
> > +    description: phandle to reset controller with the reset number in
> > +      the second cell
> > +
> > +  bus-frequency:
> > +    minimum: 500
> > +    maximum: 4000000
> > +    default: 100000
> > +    description: frequency of the bus clock in Hz defaults to 100 kHz 
> > when not
> > +      specified
> > +
> > +  multi-master:
> > +    type: boolean
> > +    description:
> > +      states that there is another master active on this bus
> > +
> > +required:
> > +  - reg
> > +  - compatible
> > +  - clocks
> > +  - resets
> > +
> > +unevaluatedProperties: false
> > +
> > +examples:
> > +  - |
> > +    #include <dt-bindings/clock/aspeed-clock.h>
> > +    i2c0: i2c-bus@40 {
> > +      #address-cells = <1>;
> > +      #size-cells = <0>;
> > +      #interrupt-cells = <1>;
> > +      reg = <0x40 0x40>;
> > +      compatible = "aspeed,ast2500-i2c-bus";
> > +      clocks = <&syscon ASPEED_CLK_APB>;
> > +      resets = <&syscon ASPEED_RESET_I2C>;
> > +      bus-frequency = <100000>;
> > +      interrupts = <0>;
> > +      interrupt-parent = <&i2c_ic>;
> > +      status = "disabled";
> > +      /* Does not need pinctrl properties */
> 
> Note this actually isn't right and someone (me?) needs to send a patch 
> to fix the devicetree(s) - the I2C mux properties for bus 0 and 1 just 
> don't have a group, and so SCL and SDA need to be muxed individually.
> 
> I expect we wound up with this comment by a lack of a match for an 
> erroneous grep.
> 
> Andrew
Understand. Can I change the example as the following or can you give me
any suggestion?

i2c0: i2c-bus@40 {
  #address-cells = <1>;
  #size-cells = <0>;
  #interrupt-cells = <1>;
  reg = <0x40 0x40>;
  compatible = "aspeed,ast2500-i2c-bus";
  clocks = <&syscon ASPEED_CLK_APB>;
  resets = <&syscon ASPEED_RESET_I2C>;
  bus-frequency = <100000>;
  interrupts = <0>;
  interrupt-parent = <&i2c_ic>;

Thanks-Jamin