linux-kernel - Re: [PATCH next v4 2/2] dt-bindings: i2c: add entry for hisilicon,hisi-i2c

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Date:   Tue, 13 Sep 2022 17:08:41 +0800
From:   chenweilong <chenweilong@...wei.com>
To:     Yicong Yang <yangyicong@...wei.com>, <yangyicong@...ilicon.com>,
        <xuwei5@...wei.com>, <wsa@...nel.org>, <robh+dt@...nel.org>
CC:     <linux-i2c@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <devicetree@...r.kernel.org>
Subject: Re: [PATCH next v4 2/2] dt-bindings: i2c: add entry for
 hisilicon,hisi-i2c

On 2022/9/13 15:59, Yicong Yang wrote:
> On 2022/9/9 15:48, Weilong Chen wrote:
>> Add the new compatible for HiSilicon common i2c.
>>
>> Signed-off-by: Weilong Chen <chenweilong@...wei.com>
>> ---
>>  .../bindings/i2c/hisilicon,hisi-i2c.yaml      | 67 +++++++++++++++++++
>>  1 file changed, 67 insertions(+)
>>  create mode 100644 Documentation/devicetree/bindings/i2c/hisilicon,hisi-i2c.yaml
>>
>> diff --git a/Documentation/devicetree/bindings/i2c/hisilicon,hisi-i2c.yaml b/Documentation/devicetree/bindings/i2c/hisilicon,hisi-i2c.yaml
>> new file mode 100644
>> index 000000000000..f1cb6a4c70d1
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/i2c/hisilicon,hisi-i2c.yaml
>> @@ -0,0 +1,67 @@
>> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
>> +%YAML 1.2
>> +---
>> +$id: "http://devicetree.org/schemas/i2c/hisilicon,hisi-i2c.yaml#"
>> +$schema: "http://devicetree.org/meta-schemas/core.yaml#"
>> +
>> +title: HiSilicon common IIC controller Device Tree Bindings
>> +
>> +maintainers:
>> +  - yangyicong@...wei.com
>> +
>> +allOf:
>> +  - $ref: /schemas/i2c/i2c-controller.yaml#
>> +
>> +properties:
>> +  compatible:
>> +    const: hisilicon,hisi-i2c
>> +
>> +  reg:
>> +    maxItems: 1
>> +
>> +  interrupts:
>> +    maxItems: 1
>> +
>> +  clk_rate:
>> +    default: 0xEE6B280
>> +
>> +  clock-frequency:
>> +    default: 400000
>> +
>> +  i2c-sda-falling-time-ns:
>> +    default: 343
>> +
>> +  i2c-scl-falling-time-ns:
>> +    default: 203
>> +
>> +  i2c-sda-hold-time-ns:
>> +    default: 0x33E
>> +
>> +  i2c-scl-rising-time-ns:
>> +    default: 365
>> +
>> +  i2c-digital-filter-width-ns:
>> +    default: 0
>> +
>> +required:
>> +  - compatible
>> +  - reg
>> +  - interrupts
>> +
>> +unevaluatedProperties: false
>> +
>> +examples:
>> +  - |
>> +    i2c1: i2c@...8B0000{
>> +      compatible = "hisilicon,hisi-i2c";
>> +      reg = <0x38B0000 0x10000>;
>> +      interrupts = <0x0 120 0x4>;
>> +      i2c-sda-falling-time-ns = <56>;
>> +      i2c-scl-falling-time-ns = <56>;
>> +      i2c-sda-hold-time-ns = <56>;
>> +      i2c-scl-rising-time-ns = <56>;
> The values used here are different from above. Are they used on different
> products?
Yes, it's a specific config for new product.
>> +      i2c-digital-filter;
> Should we discard the empty properties or is it necessary to have it?
>
> Others looks good to me, but the device tree experts may have some comments.
>
> This binding file should also be listed in the MAINTAINERS file.
>
> Thanks.

No, i2c-digital-filter is needed to fix the error:

dtschema/dtc warnings/errors:
/builds/robherring/dt-review-ci/linux/Documentation/devicetree/bindings/i2c/hisilicon,hisi-i2c.example.dtb: i2c@...8B0000: 'i2c-digital-filter' is a dependency of 'i2c-digital-filter-width-ns'

And, I'll update the MAINTAINERS file.

Thanks.

>> +      i2c-digital-filter-width-ns = <0x0>;
>> +      clk_rate = <0x0 0xEE6B280>;
>> +      clock-frequency = <400000>;
>> +    };
>>
> .