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

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Message-ID: <e4f3011a-5577-aa0d-2f39-a3cb6d1d8142@huawei.com>
Date:   Mon, 26 Sep 2022 17:30:15 +0800
From:   chenweilong <chenweilong@...wei.com>
To:     Rob Herring <robh@...nel.org>
CC:     <yangyicong@...ilicon.com>, <xuwei5@...wei.com>, <wsa@...nel.org>,
        <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 20:22, Rob Herring wrote:
> On Fri, Sep 09, 2022 at 03:48:42PM +0800, 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
> You need SoC specific compatibles.

Hi Rob,

I add a description for specific compatibles in the next version:

https://lore.kernel.org/lkml/20220920072215.161331-2-chenweilong@huawei.com/T/

Please take a look, Do you think that's OK?

Thank you.

>
>> +
>> +  reg:
>> +    maxItems: 1
>> +
>> +  interrupts:
>> +    maxItems: 1
>> +
>> +  clk_rate:
>> +    default: 0xEE6B280
> What is this property for? Use the clock binding.
>
>> +
>> +  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
> The rest are in decimal. Be consistent.
>
>> +
>> +  i2c-scl-rising-time-ns:
>> +    default: 365
>> +
>> +  i2c-digital-filter-width-ns:
>> +    default: 0
>> +
>> +required:
>> +  - compatible
>> +  - reg
>> +  - interrupts
>> +
>> +unevaluatedProperties: false
>> +
>> +examples:
>> +  - |
>> +    i2c1: i2c@...8B0000{
> Space needed              ^
>
> Use lowercase hex.
>
> Drop unused labels.
>   
>> +      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>;
>> +      i2c-digital-filter;
>> +      i2c-digital-filter-width-ns = <0x0>;
>> +      clk_rate = <0x0 0xEE6B280>;
>> +      clock-frequency = <400000>;
>> +    };
>> -- 
>> 2.31.GIT
>>
>>
> .