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[78.88.45.245]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-b8ddcf8aa7csm881056566b.9.2026.02.03.01.36.42 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 03 Feb 2026 01:36:44 -0800 (PST) Message-ID: Date: Tue, 3 Feb 2026 10:36:41 +0100 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 1/3] dt-binding: document QCOM platforms for CTCU device To: Suzuki K Poulose , Jie Gan , Mike Leach , James Clark , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Tingwei Zhang , Bjorn Andersson , Konrad Dybcio Cc: coresight@lists.linaro.org, linux-arm-kernel@lists.infradead.org, linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org References: <20260203-enable-ctcu-and-etr-v1-0-a5371a2ec2b8@oss.qualcomm.com> <20260203-enable-ctcu-and-etr-v1-1-a5371a2ec2b8@oss.qualcomm.com> <6019b38d-3a15-41f5-989e-1f576c327446@oss.qualcomm.com> <6c823646-9085-409e-a692-ae3e77347742@oss.qualcomm.com> <5911fe77-fe2c-4321-96a9-a1b6b3b5d1e3@arm.com> Content-Language: en-US From: Konrad Dybcio In-Reply-To: <5911fe77-fe2c-4321-96a9-a1b6b3b5d1e3@arm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMjAzMDA3NiBTYWx0ZWRfX/yYin+FOmhRG /23fcZBXEi1cm73mzi6baNeOT2q7J+sYNxmZ49nitedMo5EV5+abdVuPyzv7E4nTd1mprlMH5Y5 udlyj1CClIE0r96lhSuiB5ycLdFWOa/xL4IuYxIVTUQWcIpLkuTBb4NCWJ5lo8DdrMAqtI9S3z+ 64TjLD385jYzwKzwRr2YHIma3iHeyBo4dnq6wYNv8bm8g5BbH+kNntcg4OopthRtoXucBmRqh8d cFll6NyZPSYal2xPVGSijpEB3ssXZSxcRCV1TUIo007Lhc5oozGggGQUFpkZxJYCWrqAQdBnkSF fGSBnsPEF9Fjj/35OsVbr/bH2JaZFx4z9/K++UcYCH0tH6OIgGEIi1z+FP+BVS+PIpdOGQJrLDE KTGF+gQ3hw9rZq94BcLdT9pTOUwkqBringEKT8YxkDP4zZ76i4ObiYuzwzUhU31nOWWifIU8D5D mSKCjwg6qYzPZh6Gsdg== X-Proofpoint-GUID: 3wYvdc2CoGegeziVPXtR-Qxrnok_uXVO X-Authority-Analysis: v=2.4 cv=NOfYOk6g c=1 sm=1 tr=0 ts=6981c1ae cx=c_pps a=qKBjSQ1v91RyAK45QCPf5w==:117 a=FpWmc02/iXfjRdCD7H54yg==:17 a=IkcTkHD0fZMA:10 a=HzLeVaNsDn8A:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=EUspDBNiAAAA:8 a=JA-vdinaGFA0ZwrEKSsA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 a=NFOGd7dJGGMPyQGDc5-O:22 X-Proofpoint-ORIG-GUID: 3wYvdc2CoGegeziVPXtR-Qxrnok_uXVO X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-02-03_03,2026-02-02_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 bulkscore=0 priorityscore=1501 suspectscore=0 impostorscore=0 adultscore=0 lowpriorityscore=0 clxscore=1015 malwarescore=0 spamscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2601150000 definitions=main-2602030076 On 2/3/26 10:31 AM, Suzuki K Poulose wrote: > On 03/02/2026 09:00, Jie Gan wrote: >> >> >> On 2/3/2026 4:50 PM, Konrad Dybcio wrote: >>> On 2/3/26 9:08 AM, Jie Gan wrote: >>>> Document the platforms that fallback to using the qcom,sa8775p-ctcu >>>> compatible for probing. >>>> >>>> Signed-off-by: Jie Gan >>>> --- >>>>   Documentation/devicetree/bindings/arm/qcom,coresight-ctcu.yaml | 4 ++++ >>>>   1 file changed, 4 insertions(+) >>>> >>>> diff --git a/Documentation/devicetree/bindings/arm/qcom,coresight- ctcu.yaml b/Documentation/devicetree/bindings/arm/qcom,coresight- ctcu.yaml >>>> index e002f87361ad..68853db52bef 100644 >>>> --- a/Documentation/devicetree/bindings/arm/qcom,coresight-ctcu.yaml >>>> +++ b/Documentation/devicetree/bindings/arm/qcom,coresight-ctcu.yaml >>>> @@ -29,6 +29,10 @@ properties: >>>>       oneOf: >>>>         - items: >>>>             - enum: >>>> +              - qcom,glymur-ctcu >>>> +              - qcom,hamoa-ctcu >>>> +              - qcom,kaanapali-ctcu >>>> +              - qcom,pakala-ctcu >>> >>> Platforms with existing numeric compatibles should continue to use them, >>> so that the mess is somewhat containable >> >> Sure Konrad. So for Pakala, I will change it back to qcom,sm8750-ctcu > > Why do we need different compatibles for the others ? Are they not all compliant to the CTCU programming model ? i.e., sa8775p-ctcu ? or even, > a generic, > > qcom,coresight-ctcu It's a huge anti-pattern with the DT maintainers, since a compatible is the only way to effectively differentiate different implementations (i.e. instances on different SoCs) of an IP block This is important for the case where a DTB is shipped as part of firmware and can not be replaced - if some quirk needs to be applied retroactively, we can look for "qcom,glymur-ctcu" without affecting all the 50 other' users of the effectively-identical IP block In this case, we're already reducing the impact on the driver, as that only looks for the single fallback compatible (qcom,sa8775p-ctcu) Konrad