linux-kernel - Re: [PATCH v3 1/2] dt-bindings: i2c: spacemit: add support for K1 SoC

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Message-ID: <9a1e20a0-6a79-4bb3-990c-a1c6dfb22f1c@gmail.com>
Date: Thu, 21 Nov 2024 12:12:04 +0800
From: Troy Mitchell <troymitchell988@...il.com>
To: Yixun Lan <dlan@...too.org>, Conor Dooley <conor@...nel.org>
Cc: troymitchell988@...il.com, Andi Shyti <andi.shyti@...nel.org>,
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, linux-riscv@...ts.infradead.org,
 linux-i2c@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/2] dt-bindings: i2c: spacemit: add support for K1 SoC

Hi, Yixun. Thanks for ur review.

On 2024/11/14 15:06, Yixun Lan wrote:
> On 18:03 Tue 12 Nov     , Conor Dooley wrote:
>> On Tue, Nov 12, 2024 at 11:07:39AM +0800, Troy Mitchell wrote:
>>> From: Troy Mitchell <troymitchell988@...il.com>
>>>
>>> The I2C of K1 supports fast-speed-mode and high-speed-mode,
>>> and supports FIFO transmission.
>>>
>>> Signed-off-by: Troy Mitchell <TroyMitchell988@...il.com>
>>> ---
>>>  .../devicetree/bindings/i2c/spacemit,k1-i2c.yaml   | 52 ++++++++++++++++++++++
>>>  1 file changed, 52 insertions(+)
>>>
>>> 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..e8cce360bf03
>>> --- /dev/null
>>> +++ b/Documentation/devicetree/bindings/i2c/spacemit,k1-i2c.yaml
>>> @@ -0,0 +1,52 @@
>>> +# 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
>>> +
>>> +  reg:
>>> +    maxItems: 1
>>> +
>>> +  interrupts:
>>> +    maxItems: 1
>>> +
>>> +  clocks:
>>> +    maxItems: 1
>>> +
>>> +  clock-frequency:
>>> +    description:
>>> +      Desired I2C bus clock frequency in Hz.
>>> +      K1 supports standard, fast, high-speed modes, from 1 to 3300000.
> while we are here, I'd suggest rephrase the sentence above to align it better with the doc
> 
> K1 support three different modes which running different frequencies
> standard speed mode: up to 100000 (100Hz)
> fast speed mode    : up to 400000 (400Hz)
> high speed mode    : up to 3300000 (3.3Mhz)>
>>> +    default: 100000
>>> +    minimum: 1
I will modify `description` and drop `minimum` in next version
>>> +    maximum: 3300000
>>
>> It's sufficient to define just default and max btw, the min is set in
>> i2c-controller.yaml (in dt-schema itself). Don't respin for that alone.
> +1, the minimum settings isn't really useful, clearly not apply in the practical case
> 
>>
>> Reviewed-by: Conor Dooley <conor.dooley@...rochip.com>
>>> +
>>> +required:
>>> +  - compatible
>>> +  - reg
>>> +  - interrupts
>>> +  - clocks
>>> +
>>> +unevaluatedProperties: false
>>> +
>>> +examples:
>>> +  - |
>>> +    i2c@...10800 {
>>> +        compatible = "spacemit,k1-i2c";
>>> +        reg = <0xd4010800 0x38>;
>>> +        interrupt-parent = <&plic>;
>>> +        interrupts = <36>;
>>> +        clocks = <&ccu 90>;
>>> +        clock-frequency = <100000>;
>>> +    };
>>> +
>>> +...
>>>
>>> -- 
>>> 2.34.1
>>>
> 
> 
> 

-- 
Troy Mitchell