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Wed, 26 Aug 2026 06:05:47 -0700 (PDT) X-Received: by 2002:a05:6122:8497:b0:5bd:7446:e3ff with SMTP id 71dfb90a1353d-5c66c2ca6f1mr71785e0c.0.1787749547145; Wed, 26 Aug 2026 06:05:47 -0700 (PDT) Received: from [192.168.120.193] ([178.235.128.140]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-c250a5d647dsm450943766b.13.2026.08.26.06.05.44 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 26 Aug 2026 06:05:45 -0700 (PDT) Message-ID: <6cf9db07-e46b-4037-b7f0-03874b62b36b@oss.qualcomm.com> Date: Wed, 26 Aug 2026 15:05:43 +0200 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 v3 2/2] i2c: qcom-target: Add driver for Qualcomm I2C target controller To: Viken Dadhaniya , Mukesh Kumar Savaliya , Andi Shyti , Rob Herring , Krzysztof Kozlowski , Conor Dooley Cc: linux-arm-msm@vger.kernel.org, linux-i2c@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org References: <20260813-i2c-qcom-slave-v3-0-1d3742e2ad47@oss.qualcomm.com> <20260813-i2c-qcom-slave-v3-2-1d3742e2ad47@oss.qualcomm.com> <9c8e4e57-135b-4f24-97b5-dde9c0418efd@oss.qualcomm.com> <41af9695-44f2-48cb-b5f2-8e779f7366cc@oss.qualcomm.com> Content-Language: en-US From: Konrad Dybcio In-Reply-To: <41af9695-44f2-48cb-b5f2-8e779f7366cc@oss.qualcomm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Authority-Analysis: v=2.4 cv=EMA2FVZC c=1 sm=1 tr=0 ts=6a8ee4ac cx=c_pps a=KB4UBwrhAZV1kjiGHFQexw==:117 a=PRfkaYvzSr8QmIIGAkY2Sg==:17 a=IkcTkHD0fZMA:10 a=Sv0fKeRqtYgA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=_glEPmIy2e8OvE2BGh3C:22 a=-uBuh7dnxZ-1HGoY8H8A:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 a=o1xkdb1NAhiiM49bd1HK:22 X-Proofpoint-ORIG-GUID: nguaAkEf-6cKYesL8lI3ETU1cBjQFb-S X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwODI2MDEwOCBTYWx0ZWRfXyKAH9DDkPf75 obMSEzaeKK8/bQXHFln/cWixlqCrNNtsNEReb55/xdHJDgqoIJZLDAfdgwDyCr1x17/dMEVJfvS SHsj2RFRRADKSe6TJxK+dwqDFBIFNd99jzNANtvN4DsVhOyRr2hiZ+RX2F1RtM9L1egaY00IqSY ytZSNY3y9ulwdfSD1LkeyHmcQeLTrWDvkKjuoEmjfmDoEDM2edqOpWZUw31mwati/eYCRbpueA/ 1EOGhQRnF9wz72/Vy9a3ZNDBOVAMqyD3eltUM2l+iFOKW78rcyLX8Eo8+f8LRTORN5AXlRfl4oK h4qyqcxq1KQA3jz3AqM1vA/yK0LtZFiepwNrpTVGeDkg9yoXjmm0NmsMt3xnYcc4Pe9JKz1v00+ 35mYuhK9BntgI3YxsY2yDqwzETnPVCg4sS8gw46yfgfwddttiYizX3iD3LblOuLBdlSR7bXxp0H tqIDBcMtyP/0n66u5kg== X-Proofpoint-Spam-Info: AW1haW4tMjYwODI2MDEwOCBTYWx0ZWRfX5kyIYhiG0yqy P6OeZGO1vT3RF2NvMEm+0+wrS4EjcIcXoVaxtBh/9lFx1MuG2mgWkwUp6HPFLTfHWIh0DILXbxV xDvYQmIKTWVRqMJPL13j4+/d9YyGQ4c= X-Proofpoint-GUID: nguaAkEf-6cKYesL8lI3ETU1cBjQFb-S X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-08-26_03,2026-08-26_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 lowpriorityscore=0 spamscore=0 adultscore=0 malwarescore=0 clxscore=1015 phishscore=0 priorityscore=1501 suspectscore=0 bulkscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2608260108 On 8/26/26 2:52 PM, Viken Dadhaniya wrote: > > > On 8/25/2026 3:11 PM, Konrad Dybcio wrote: >> On 8/13/26 5:52 PM, Viken Dadhaniya wrote: >>> QDU1000 and related Qualcomm SoCs include a dedicated I2C target >>> controller that operates exclusively in target mode. The existing >>> Qualcomm I2C controller drivers (GENI, QUP) are master-only and cannot >>> serve systems where the SoC must respond as an I2C target on the bus. >> >> [...] >> >>> + ret = clk_prepare_enable(target->xo_clk); >>> + if (ret) >>> + return dev_err_probe(dev, ret, "failed to enable XO clock\n"); >>> + >>> + ret = clk_prepare_enable(target->ahb_clk); >>> + if (ret) { >>> + clk_disable_unprepare(target->xo_clk); >>> + return dev_err_probe(dev, ret, "failed to enable AHB clock\n"); >>> + } >> >> Does this need an OPP table? Presumably we need a power vote for each bus >> frequency > > The xo and ahb are simple gate clocks with no rate states — > xo runs at a fixed 19.2 MHz and the ahb rate is fabric-managed. > Since this is a target-only controller the master drives bus speed, > so there is nothing for us to scale. OPP is not needed here OK, thanks for confirming. Konrad