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

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Message-ID: <e8adc4a7-ee03-401d-8a3f-0fb415318ad3@amlogic.com>
Date: Mon, 22 Jul 2024 15:41:18 +0800
From: Yang Li <yang.li@...ogic.com>
To: Krzysztof Kozlowski <krzk@...nel.org>,
 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 2024/7/21 2:25, Krzysztof Kozlowski wrote:
> 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.
>
Hi Krzysztof

Seeking feedback on proposed changes:

"The W155S2 is Amlogic's Bluetooth and Wi-Fi combo chip. It works on the 
standard H4 protocol via a 4-wire UART interface, and supporting maximum 
baud rates up to 4 Mbps."

>>>> +    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?

Yes, it can be used on dirfferent boards. The device can operate in both 
standalone mode and coexistence mode. typically running standalone mode.

Therefore, I would like to revise the description as follows:

aml,coexisting:
     type: boolean
     description: Enable coexistence mode, allowing shared antenna usage 
with Wi-Fi.

>
> Best regards,
> Krzysztof
>