linux-kernel - Re: [PATCH v2 1/3] dt-bindings: net: bluetooth: Add support for Amlogic Bluetooth

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Message-ID: <1582443b-c20a-4e3a-b633-2e7204daf7e0@kernel.org>
Date: Sat, 20 Jul 2024 20:25:26 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Yang Li <yang.li@...ogic.com>, Marcel Holtmann <marcel@...tmann.org>,
 Luiz Augusto von Dentz <luiz.dentz@...il.com>,
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, Catalin Marinas
 <catalin.marinas@....com>, Will Deacon <will@...nel.org>
Cc: linux-bluetooth@...r.kernel.org, netdev@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 1/3] dt-bindings: net: bluetooth: Add support for
 Amlogic Bluetooth

On 19/07/2024 10:20, Yang Li wrote:
> Dear Krzysztof
> 
> Thanks.
> 
> On 2024/7/18 19:40, Krzysztof Kozlowski wrote:
>> On 18/07/2024 09:42, Yang Li via B4 Relay wrote:
>>> From: Yang Li <yang.li@...ogic.com>
>>>
>>> Add binding document for Amlogic Bluetooth chipsets attached over UART.
>>>
>>> Signed-off-by: Yang Li <yang.li@...ogic.com>
>>> ---
>>>   .../bindings/net/bluetooth/amlogic,w155s2-bt.yaml  | 66 ++++++++++++++++++++++
>>>   1 file changed, 66 insertions(+)
>>>
>>> diff --git a/Documentation/devicetree/bindings/net/bluetooth/amlogic,w155s2-bt.yaml b/Documentation/devicetree/bindings/net/bluetooth/amlogic,w155s2-bt.yaml
>>> new file mode 100644
>>> index 000000000000..2e433d5692ff
>>> --- /dev/null
>>> +++ b/Documentation/devicetree/bindings/net/bluetooth/amlogic,w155s2-bt.yaml
>>> @@ -0,0 +1,66 @@
>>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>>> +# Copyright (C) 2024 Amlogic, Inc. All rights reserved
>>> +%YAML 1.2
>>> +---
>>> +$id: http://devicetree.org/schemas/net/bluetooth/amlogic,w155s2-bt.yaml#
>>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>>> +
>>> +title: Amlogic Bluetooth chips
>>> +
>>> +description:
>>> +  This binding describes UART-attached Amlogic bluetooth chips.
>> <form letter>
>> This is a friendly reminder during the review process.
>>
>> It seems my or other reviewer's previous comments were not fully
>> addressed. Maybe the feedback got lost between the quotes, maybe you
>> just forgot to apply it. Please go back to the previous discussion and
>> either implement all requested changes or keep discussing them.
>>
>> Thank you.
>> </form letter>
> 
> Apologies for the earlier omission. I have amended the description of the
> 
> UART-attached Amlogic Bluetooth chips in the patch:
> 
> "This binding describes Amlogic Bluetooth chips connected via UART,
> 
> which function as dual-radio devices supporting Wi-Fi and Bluetooth.
> 
> It operates on the H4 protocol over a 4-wire UART, with RTS and CTS lines
> 
> used for firmware download. It supports Bluetooth and Wi-Fi coexistence."

You still say what is the binding which is pointless. Binding is a
binding... awesome. No, say what the hardware is.



>>
>>> +    description: bluetooth chip 3.3V supply regulator handle
>>> +
>>> +  clocks:
>>> +    maxItems: 1
>>> +    description: clock provided to the controller (32.768KHz)
>>> +
>>> +  antenna-number:
>>> +    default: 1
>>> +    description: device supports up to two antennas
>> Keep it consistent - either descriptions are the last property or
>> somewhere else. Usually the last.
>>
>>> +    $ref: /schemas/types.yaml#/definitions/uint32
>> And what does it mean? What happens if BT uses antenna number 2, not 1?
>> What is connected to the other antenna? It really feels useless to say
>> which antenna is connected to hardware.
> 
> Sorry, the antenna description was incorrect, it should specify whether
> 
> Bluetooth and WiFi coexist. I will change it as below:
> 
>      aml,work-mode:
>      type: boolean
>      description: specifywhether Bluetooth and WiFi coexist.

So one device can be used on different boards - some without WiFi
antenna? But, why in the binding of bluetooth you describe whether there
is WiFi antenna?

Best regards,
Krzysztof