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Fri, 27 Sep 2024 06:31:19 GMT Received: from pps.reinject (localhost [127.0.0.1]) by APBLRPPMTA02.qualcomm.com (PPS) with ESMTPS id 41sq7mnbn1-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 27 Sep 2024 06:31:19 +0000 Received: from APBLRPPMTA02.qualcomm.com (APBLRPPMTA02.qualcomm.com [127.0.0.1]) by pps.reinject (8.17.1.5/8.17.1.5) with ESMTP id 48R6VJGD001832; Fri, 27 Sep 2024 06:31:19 GMT Received: from hu-maiyas-hyd.qualcomm.com (hu-msavaliy-hyd.qualcomm.com [10.213.110.207]) by APBLRPPMTA02.qualcomm.com (PPS) with ESMTPS id 48R6VIeA001830 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 27 Sep 2024 06:31:19 +0000 Received: by hu-maiyas-hyd.qualcomm.com (Postfix, from userid 429934) id 491322408B; Fri, 27 Sep 2024 12:01:18 +0530 (+0530) From: Mukesh Kumar Savaliya To: konrad.dybcio@linaro.org, andersson@kernel.org, andi.shyti@kernel.org, linux-arm-msm@vger.kernel.org, dmaengine@vger.kernel.org, linux-kernel@vger.kernel.org, linux-i2c@vger.kernel.org, conor+dt@kernel.org, agross@kernel.org, devicetree@vger.kernel.org, vkoul@kernel.org, linux@treblig.org, dan.carpenter@linaro.org, Frank.Li@nxp.com, konradybcio@kernel.org, bryan.odonoghue@linaro.org, krzk+dt@kernel.org, robh@kernel.org Cc: Mukesh Kumar Savaliya Subject: [PATCH v3 1/4] dt-bindindgs: i2c: qcom, i2c-geni: Document shared flag Date: Fri, 27 Sep 2024 12:01:05 +0530 Message-Id: <20240927063108.2773304-2-quic_msavaliy@quicinc.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20240927063108.2773304-1-quic_msavaliy@quicinc.com> References: <20240927063108.2773304-1-quic_msavaliy@quicinc.com> Precedence: bulk X-Mailing-List: linux-arm-msm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-QCInternal: smtphost X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-GUID: s5bbIV4iZjwRAE0a7PneTwOXCcIfgVAo X-Proofpoint-ORIG-GUID: s5bbIV4iZjwRAE0a7PneTwOXCcIfgVAo X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1039,Hydra:6.0.680,FMLib:17.12.60.29 definitions=2024-09-06_09,2024-09-06_01,2024-09-02_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 spamscore=0 adultscore=0 clxscore=1015 lowpriorityscore=0 suspectscore=0 malwarescore=0 impostorscore=0 mlxlogscore=999 bulkscore=0 mlxscore=0 priorityscore=1501 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2408220000 definitions=main-2409270043 Adds qcom,shared-se flag usage. Use this when particular I2C serial controller needs to be shared between two subsystems. SE = Serial Engine, meant for I2C controller here. TRE = Transfer Ring Element, refers to Queued Descriptor. SS = Subsystems (APPS processor, Modem, TZ, ADSP etc). Example : Two clients from different SS can share an I2C SE for same slave device OR their owned slave devices. Assume I2C Slave EEPROM device connected with I2C controller. Each client from ADSP SS and APPS Linux SS can perform i2c transactions. This gets serialized by lock TRE + DMA Transfers + Unlock TRE at HW level. Signed-off-by: Mukesh Kumar Savaliya --- Documentation/devicetree/bindings/i2c/qcom,i2c-geni-qcom.yaml | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/Documentation/devicetree/bindings/i2c/qcom,i2c-geni-qcom.yaml b/Documentation/devicetree/bindings/i2c/qcom,i2c-geni-qcom.yaml index 9f66a3bb1f80..3b9b20a0edff 100644 --- a/Documentation/devicetree/bindings/i2c/qcom,i2c-geni-qcom.yaml +++ b/Documentation/devicetree/bindings/i2c/qcom,i2c-geni-qcom.yaml @@ -60,6 +60,10 @@ properties: power-domains: maxItems: 1 + qcom,shared-se: + description: True if I2C needs to be shared between two or more subsystems(SS). + type: boolean + reg: maxItems: 1