linux-kernel - Re: [PATCH v1 1/2] dt-bindings: i2c: spacemit: add support for K1 SoC

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Message-ID: <611273f9-db44-48a1-a665-6180bed196a9@gmail.com>
Date: Wed, 16 Oct 2024 10:45:57 +0800
From: Troy Mitchell <troymitchell988@...il.com>
To: Krzysztof Kozlowski <krzk@...nel.org>, andi.shyti@...nel.org,
 robh@...nel.org, krzk+dt@...nel.org, conor+dt@...nel.org
Cc: linux-i2c@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, troymitchell988@...il.com
Subject: Re: [PATCH v1 1/2] dt-bindings: i2c: spacemit: add support for K1 SoC


On 2024/10/15 16:02, Krzysztof Kozlowski wrote:
> On 15/10/2024 09:51, Troy Mitchell wrote:
>> The i2c of K1 supports fast-speed-mode and high-speed-mode,
> 
> s/i2c/I2C/
> 
>> and supports FIFO transmission.
>>
>> Signed-off-by: Troy Mitchell <TroyMitchell988@...il.com>
>> ---
>>  .../bindings/i2c/spacemit,k1-i2c.yaml         | 59 +++++++++++++++++++
>>  1 file changed, 59 insertions(+)
>>  create mode 100644 Documentation/devicetree/bindings/i2c/spacemit,k1-i2c.yaml
>>
>> diff --git a/Documentation/devicetree/bindings/i2c/spacemit,k1-i2c.yaml b/Documentation/devicetree/bindings/i2c/spacemit,k1-i2c.yaml
>> new file mode 100644
>> index 000000000000..c1460ec2b323
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/i2c/spacemit,k1-i2c.yaml
>> @@ -0,0 +1,59 @@
>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/i2c/spacemit,k1-i2c.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: I2C controller embedded in SpacemiT's K1 SoC
>> +
>> +maintainers:
>> +  - Troy Mitchell <troymitchell988@...il.com>
>> +
>> +properties:
>> +  compatible:
>> +    const: spacemit,k1-i2c
> 
> There is no such vendor prefix.
> 
>> +
>> +  reg:
>> +    maxItems: 1
>> +
>> +  interrupts:
>> +    maxItems: 1
>> +
>> +  clocks:
>> +    maxItems: 1
>> +
>> +  clock-frequency:
>> +    description:
>> +      Desired I2C bus clock frequency in Hz. As only fast and high-speed
>> +      modes are supported by hardware, possible values are 100000 and 400000.
>> +    enum: [100000, 400000]
>> +    default: 100000
>> +
>> +  fifo-disable:
> 
> Why is this a property of a board?
> 
> Also, missing vendor prefix.
> 
> 
>> +    type: boolean
>> +    description:
>> +      Whether to disable FIFO. If FIFO is turned on, it will be interrupted
>> +      only when the FIFO depth is reached, which can reduce the frequency
>> +      of interruption.
>> +    default: false
> 
> Drop

It's a hardware FIFO instead of software.
Is it unnecessary in this file?
If is, why dma can be written in dt-binding.

> 
>> +
>> +unevaluatedProperties: false
> 
> This goes after required: block.
> 
> 
>> +
>> +required:
>> +  - compatible
>> +  - reg
>> +  - interrupts
>> +  - clocks
>> +
>> +examples:
>> +  - |
>> +    i2c0: i2c@...10800 {
> 
> Drop unused alias
> 
>> +        compatible = "spacemit,k1-i2c";
> 
> Best regards,
> Krzysztof
> 

Best regards,
Troy