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

Yicong Yang
2022-09-13T09:40:16Z

On 2022/9/13 17:08, chenweilong wrote:
> 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@huawei.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@huawei.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@5038B0000{
>>> + 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@5038B0000: 'i2c-digital-filter' is a dependency of 'i2c-digital-filter-width-ns'
>
> And, I'll update the MAINTAINERS file.
>

ok. Thanks for the explanation.

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