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[78.88.45.245]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-658b4256a4bsm9283483a12.2.2026.02.03.02.13.19 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 03 Feb 2026 02:13:21 -0800 (PST) Message-ID: <0ff093e9-39a8-41df-81eb-c2f753a32a71@oss.qualcomm.com> Date: Tue, 3 Feb 2026 11:13:19 +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: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMjAzMDA4MSBTYWx0ZWRfX/EKQGvqfF5s9 CwFxqcHvk7p4iF5YLdqd1Izs/izof5fSFSjIeMMbK4qZugPV6YlCis9BSj8tioUVlMocNgd+1dA Z99pFfP+TA0seTulHWP8TxFAGMAmr57wirFYMDd5w52zJXLUBlY/MY2gjZJM1bCo1Qiby7NWesG UF8GBXpqT+71+kX+iQQc6dMYZg2N1qEKTzUoX3CDLkep/waU3zk0x8TMMtoYnYM/IL0mOr++2hL ucvcbInDPd0X0TfeHx17D92bKCZDYXAb/s8/Rxq1DuMTxNsd7jDPyvNk03cD9eeyZsPLq7RG0vF h6kfafMC1Hv9IEqAaHm3Amhup0Knyt1ObJDFuOeYznxwDe+nlnC3HOhVrtJ8mqDsApTNxZCfPMW 0WOsRHxuEPYgQVQUd/bMhLbgW+HXkTSWp4/5JgCATeX74OlzED1jrkrZrXzGY3I2L9t5DPvth0/ g3rJd7iowb75H+jbR6Q== X-Proofpoint-ORIG-GUID: 4eUSDexZ30XUytdyBh5qr8g98Z3LuvEM X-Authority-Analysis: v=2.4 cv=L4sQguT8 c=1 sm=1 tr=0 ts=6981ca43 cx=c_pps a=wEM5vcRIz55oU/E2lInRtA==:117 a=FpWmc02/iXfjRdCD7H54yg==:17 a=IkcTkHD0fZMA:10 a=HzLeVaNsDn8A:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=EUspDBNiAAAA:8 a=CS0xlA_fLX8Yt5LHUfsA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 a=OIgjcC2v60KrkQgK7BGD:22 X-Proofpoint-GUID: 4eUSDexZ30XUytdyBh5qr8g98Z3LuvEM 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 adultscore=0 phishscore=0 malwarescore=0 spamscore=0 bulkscore=0 clxscore=1015 priorityscore=1501 suspectscore=0 lowpriorityscore=0 impostorscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2601150000 definitions=main-2602030081 On 2/3/26 10:44 AM, Suzuki K Poulose wrote: > On 03/02/2026 09:36, Konrad Dybcio wrote: >> 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 > > Do you mean, same IP block integrated to different SoC ? Or are they > different implementations altogether ? Why are these not applicable for > other components ? (e.g., Tnoc, I-Tnoc, TPDA, TPDM etc ?) The former. I think coresight bindings are fully generic, since they have been in place for about as long as the arm64 port, which precedes actual bindings validation (yaml dt-bindings) and in those times the requirements were way more lax Konrad >> 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 > > Fair enough, thank for the explanation. > > Kind regards > Suzuki > >> >> 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 >