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Thu, 16 Jul 2026 05:42:07 -0700 (PDT) X-Received: by 2002:a05:6300:6698:b0:3c3:9df8:2eed with SMTP id adf61e73a8af0-3c39df84eb6mr364351637.31.1784205727287; Thu, 16 Jul 2026 05:42:07 -0700 (PDT) Received: from [192.168.1.9] ([106.222.231.43]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-3140e6c10dcsm13466080eec.23.2026.07.16.05.41.59 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 16 Jul 2026 05:42:06 -0700 (PDT) Message-ID: Date: Thu, 16 Jul 2026 18:11:57 +0530 Precedence: bulk X-Mailing-List: linux-i2c@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v8 1/4] dt-bindings: i2c: qcom,i2c-geni: Document multi-owner controller support To: Bjorn Andersson Cc: viken.dadhaniya@oss.qualcomm.com, andi.shyti@kernel.org, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, vkoul@kernel.org, Frank.Li@kernel.org, konradybcio@kernel.org, dmitry.baryshkov@oss.qualcomm.com, linmq006@gmail.com, quic_jseerapu@quicinc.com, zhengxingda@iscas.ac.cn, kees@kernel.org, agross@kernel.org, linux-arm-msm@vger.kernel.org, linux-i2c@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, dmaengine@vger.kernel.org, krzysztof.kozlowski@oss.qualcomm.com, bartosz.golaszewski@oss.qualcomm.com, bjorn.andersson@oss.qualcomm.com, konrad.dybcio@oss.qualcomm.com References: <20260708051023.2872304-1-mukesh.savaliya@oss.qualcomm.com> <20260708051023.2872304-2-mukesh.savaliya@oss.qualcomm.com> Content-Language: en-US From: Mukesh Savaliya In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Authority-Analysis: v=2.4 cv=ZpDd7d7G c=1 sm=1 tr=0 ts=6a58d1a0 cx=c_pps a=cmESyDAEBpBGqyK7t0alAg==:117 a=OlrBKP18NtReKxGUJ9moaA==:17 a=IkcTkHD0fZMA:10 a=RAioF0-LDSMA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=_K5XuSEh1TEqbUxoQ0s3:22 a=gVzQGNjsJTxi2T7I5nMA:9 a=QEXdDO2ut3YA:10 a=1OuFwYUASf3TG4hYMiVC:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNzE2MDEzMCBTYWx0ZWRfX5tjQoatVStvs RclaJ+Lk/OKzWC0QVC99uK99AgjwJQpXbU7Ok7HMbDqIYM3FUpci8ijhQ9R6bTBm8rdq/+kGDgj McPTTdg8OOosbW81d92/jrqxSpLkhWr95MbMhU05eu4mA3G0kT9Z1zSNIDPVoY0A/7YT1DjEGop woLJGvTUEc8iYrKzMkhqqLwCLzYBGacYeRFhkdTTKYD5XvzMekL7iMYvFzfYup44Pj34+U2g6x0 GblTOYL2uKZbpsYrCclDwDauL24IBHteQRF0r38CG0BNmNdJnmer2oSnogwv6+CJ93kQM2rfb47 gUI3JhqOnO1mzYWpKRcIFPlw95s+ORE4QJ5+YTnhXBgpzbP4i/IklGow9zarZ3JiMBvE6byFNDW PvUIUWt9fJYF7QqxuYfoBQBu+StCV59bzjPjP8QVyzITKCoXsbaSx/I5YE4T1j9DvO1jOmOVVAo GkY5PQYz72+Hu5UI4Zw== X-Proofpoint-GUID: DP43En0zS7uWfjt0ph2JE4NK5i3bms6C X-Proofpoint-Spam-Info: AW1haW4tMjYwNzE2MDEzMCBTYWx0ZWRfX0spnqZSZVLsX bghe4pwMXiOD5GzJ2/PPcpLbj1+A265fYeU8AifXkXiqLvSQGAAHTkPV/WSI/UVd2hpUkJML4Do +nhSgY/ePg2CZNaen0CbrOacJ0gJ/Xk= X-Proofpoint-ORIG-GUID: DP43En0zS7uWfjt0ph2JE4NK5i3bms6C X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-07-16_04,2026-07-15_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 bulkscore=0 spamscore=0 lowpriorityscore=0 impostorscore=0 phishscore=0 adultscore=0 suspectscore=0 clxscore=1015 priorityscore=1501 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2607160130 On 7/16/2026 8:44 AM, Bjorn Andersson wrote: [...] >> --- a/Documentation/devicetree/bindings/i2c/qcom,i2c-geni-qcom.yaml >> +++ b/Documentation/devicetree/bindings/i2c/qcom,i2c-geni-qcom.yaml >> @@ -60,6 +60,22 @@ properties: >> power-domains: >> maxItems: 1 >> >> + qcom,qup-multi-owner: >> + type: boolean >> + description: >> + Indicates that the QUP-based controller is shared with one or more >> + other system processors and must not be assumed to have exclusive >> + ownership by the operating system. >> + >> + The associated GPIOs must not be reconfigured into a sleep state >> + during runtime suspend, as doing so may disrupt transactions >> + initiated by another owner of the controller. > > I think this should be made even clearer that this defined a requirement > on the operating system. I also think that "sleep state" is a misnomer, > it's not the sleep state as such that is the problem (what happens if I > define a sleep state with functional settings, or what happens if I > define an "idle" state?) Agree, only mentioning of sleep state may misguide. Rather, will make it reverse, what you have pointed below. > > One way to handle this would be to declare that only "default" state is > allowed, when this property is specified. > > If we still want this, I think it should be rephrased something like: > > """ > When this option is present the Operating System must ignore any > non-default pinctrl state configuration, as reconfiguring the associated > pins might disrupt transactions initiated by another owner of the > controller. > """ > Thanks for clarity ! Will update in next patch. Let me finalize Patch 2 with alignment to DMA. > Regards, > Bjorn > >> + >> + Each owner is responsible for maintaining any resource votes >> + required for operation of the shared controller (for example clocks, >> + power domains, interconnect bandwidth, or other platform-specific >> + resources) >> + >> reg: >> maxItems: 1 >> >> -- >> 2.43.0 >>