linux-kernel - Re: [PATCH 1/2] dt-bindings: net: bluetooth: nxp: add support for supply and reset

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <3fa35cd2-e52c-4873-8a7f-db459b016a97@kernel.org>
Date: Sun, 6 Oct 2024 13:33:00 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Sherry Sun <sherry.sun@....com>,
 Catalin Popescu <catalin.popescu@...ca-geosystems.com>,
 Amitkumar Karwar <amitkumar.karwar@....com>,
 Neeraj Sanjay Kale <neeraj.sanjaykale@....com>,
 "marcel@...tmann.org" <marcel@...tmann.org>,
 "luiz.dentz@...il.com" <luiz.dentz@...il.com>,
 "robh@...nel.org" <robh@...nel.org>, "krzk+dt@...nel.org"
 <krzk+dt@...nel.org>, "conor+dt@...nel.org" <conor+dt@...nel.org>,
 "p.zabel@...gutronix.de" <p.zabel@...gutronix.de>
Cc: "linux-bluetooth@...r.kernel.org" <linux-bluetooth@...r.kernel.org>,
 "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
 "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
 "m.felsch@...gutronix.de" <m.felsch@...gutronix.de>,
 "bsp-development.geo@...ca-geosystems.com"
 <bsp-development.geo@...ca-geosystems.com>
Subject: Re: [PATCH 1/2] dt-bindings: net: bluetooth: nxp: add support for
 supply and reset

On 06/10/2024 10:49, Sherry Sun wrote:
> 
> 
>> -----Original Message-----
>> From: Catalin Popescu <catalin.popescu@...ca-geosystems.com>
>> Sent: Friday, October 4, 2024 7:36 PM
>> To: Amitkumar Karwar <amitkumar.karwar@....com>; Neeraj Sanjay Kale
>> <neeraj.sanjaykale@....com>; marcel@...tmann.org;
>> luiz.dentz@...il.com; robh@...nel.org; krzk+dt@...nel.org;
>> conor+dt@...nel.org; p.zabel@...gutronix.de
>> Cc: linux-bluetooth@...r.kernel.org; devicetree@...r.kernel.org; linux-
>> kernel@...r.kernel.org; m.felsch@...gutronix.de; bsp-
>> development.geo@...ca-geosystems.com; Catalin Popescu
>> <catalin.popescu@...ca-geosystems.com>
>> Subject: [PATCH 1/2] dt-bindings: net: bluetooth: nxp: add support for supply
>> and reset
>>
>> Add support for chip power supply and chip reset/powerdown.
>>
>> Signed-off-by: Catalin Popescu <catalin.popescu@...ca-geosystems.com>
>> ---
>>  .../bindings/net/bluetooth/nxp,88w8987-bt.yaml        | 11 +++++++++++
>>  1 file changed, 11 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/net/bluetooth/nxp,88w8987-
>> bt.yaml b/Documentation/devicetree/bindings/net/bluetooth/nxp,88w8987-
>> bt.yaml
>> index 37a65badb448..8520b3812bd2 100644
>> --- a/Documentation/devicetree/bindings/net/bluetooth/nxp,88w8987-
>> bt.yaml
>> +++ b/Documentation/devicetree/bindings/net/bluetooth/nxp,88w8987-
>> bt.yaml
>> @@ -34,6 +34,14 @@ properties:
>>    firmware-name:
>>      maxItems: 1
>>
>> +  vcc-supply:
>> +    description:
>> +      phandle of the regulator that provides the supply voltage.
>> +
>> +  reset-gpios:
>> +    description:
>> +      Chip powerdown/reset signal (PDn).
>> +
> 
> Hi Catalin,
> 
> For NXP WIFI/BT chip, WIFI and BT share the one PDn pin, which means that both wifi and BT controller will be powered on and off at the same time.
> Taking the M.2 NXP WIFI/BT module as an example, pin56(W_DISABLE1) is connected to the WIFI/BT chip PDn pin, we has already controlled this pin in the corresponding PCIe/SDIO controller dts nodes.
> It is not clear to me what exactly pins for vcc-supply and reset-gpios you describing here. Can you help understand the corresponding pins on M.2 interface as an example? Thanks.

Please wrap your replies.

It seems you need power sequencing just like Bartosz did for Qualcomm WCN.


Best regards,
Krzysztof