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Message-ID: <b8054e94-1ea4-4d39-8050-2f3ddd0a8b3f@quicinc.com>
Date: Tue, 5 Nov 2024 00:25:06 +0530
From: Raj Kumar Bhagat <quic_rajkbhag@...cinc.com>
To: Jeff Johnson <quic_jjohnson@...cinc.com>, <ath12k@...ts.infradead.org>
CC: <linux-wireless@...r.kernel.org>, Kalle Valo <kvalo@...nel.org>,
"Rob
Herring" <robh@...nel.org>,
Krzysztof Kozlowski <krzk+dt@...nel.org>,
"Conor
Dooley" <conor+dt@...nel.org>,
Jeff Johnson <jjohnson@...nel.org>,
"Bjorn
Andersson" <andersson@...nel.org>,
Konrad Dybcio <konradybcio@...nel.org>, <devicetree@...r.kernel.org>,
<linux-kernel@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>
Subject: Re: [RFC PATCH v2 1/5] dt-bindings: net: wireless: ath12k: describe
WSI properties for QCN9274
On 10/31/2024 12:34 AM, Jeff Johnson wrote:
> On 10/29/2024 10:30 AM, Raj Kumar Bhagat wrote:
>> QCN9274 device has WSI support. WSI stands for WLAN Serial Interface.
>> It is used for the exchange of specific control information across
>> radios based on the doorbell mechanism. This WSI connection is
>> essential to exchange control information among these devices
>>
>> Hence, describe WSI interface supported in QCN9274 with the following
>> properties:
>>
>> - qcom,wsi-group-id: It represents the identifier assigned to the WSI
>> connection. All the ath12k devices connected to same WSI connection
>> have the same wsi-group-id.
>>
>> - qcom,wsi-master: Indicates if this device is the WSI master.
>>
>> - ports: This is a graph ports schema that has two ports: TX (port@0)
>> and RX (port@1). This represents the actual WSI connection among
>> multiple devices.
>>
>> Also, describe the ath12k device property
>> "qcom,ath12k-calibration-variant". This is a common property among
>> ath12k devices.
>>
>> Signed-off-by: Raj Kumar Bhagat <quic_rajkbhag@...cinc.com>
>> ---
>> .../bindings/net/wireless/qcom,ath12k.yaml | 241 +++++++++++++++++-
>> 1 file changed, 232 insertions(+), 9 deletions(-)
>>
>> diff --git a/Documentation/devicetree/bindings/net/wireless/qcom,ath12k.yaml b/Documentation/devicetree/bindings/net/wireless/qcom,ath12k.yaml
>> index 1b5884015b15..42bcd73dd159 100644
>> --- a/Documentation/devicetree/bindings/net/wireless/qcom,ath12k.yaml
>> +++ b/Documentation/devicetree/bindings/net/wireless/qcom,ath12k.yaml
>> @@ -1,5 +1,6 @@
>> # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>> # Copyright (c) 2024 Linaro Limited
>> +# Copyright (c) 2024 Qualcomm Innovation Center, Inc. All rights reserved.
>> %YAML 1.2
>> ---
>> $id: http://devicetree.org/schemas/net/wireless/qcom,ath12k.yaml#
>> @@ -18,10 +19,17 @@ properties:
>> compatible:
>> enum:
>> - pci17cb,1107 # WCN7850
>> + - pci17cb,1109 # QCN9274
>>
>> reg:
>> maxItems: 1
>>
>> + qcom,ath12k-calibration-variant:
>> + $ref: /schemas/types.yaml#/definitions/string
>> + description: |
>> + string to uniquely identify variant of the calibration data for designs
>> + with colliding bus and device ids
>> +
>> vddaon-supply:
>> description: VDD_AON supply regulator handle
>>
>> @@ -49,21 +57,100 @@ properties:
>> vddpcie1p8-supply:
>> description: VDD_PCIE_1P8 supply regulator handle
>>
>> + wsi:
>> + type: object
>> + description: |
>> + The ath12k devices (QCN9274) feature WSI support. WSI stands for
>> + WLAN Serial Interface. It is used for the exchange of specific
>> + control information across radios based on the doorbell mechanism.
>> + This WSI connection is essential to exchange control information
>> + among these devices.
>> +
>> + Diagram to represent one WSI connection (one WSI group) among
>> + three devices.
>> +
>> + +-------+ +-------+ +-------+
>> + | pcie2 | | pcie3 | | pcie1 |
> is there a reason to not have these in some order?
>
This could be made in same order. In next version will update.
But in actual hardware the pcie and wsi connection may not be same order.
>> + | | | | | |
>> + +----->| wsi |------->| wsi |------->| wsi |-----+
>> + | | grp 0 | | grp 0 | | grp 2 | |
> s/grp 2/grp 0/??? ^ typo?
>
Thanks for pointing out, this is a typo. will update in next version.
>> + | +-------+ +-------+ +-------+ |
>> + +------------------------------------------------------+
>> +
>> + Diagram to represent two WSI connections (two separate WSI groups)
>> + among four devices.
>> +
>> + +-------+ +-------+ +-------+ +-------+
>> + | pcie2 | | pcie3 | | pcie1 | | pcie0 |
> again seems strange to not have any logical (to me) order
Will keep this example diagram in pcie order in next version.
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