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[129.46.96.20]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-b472d7944e6sm1256386a12.54.2025.08.15.06.18.30 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 15 Aug 2025 06:18:31 -0700 (PDT) From: Yuanfang Zhang Date: Fri, 15 Aug 2025 06:18:14 -0700 Subject: [PATCH 3/3] coresight-tnoc: Add runtime PM support for Interconnect TNOC Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20250815-itnoc-v1-3-62c8e4f7ad32@oss.qualcomm.com> References: <20250815-itnoc-v1-0-62c8e4f7ad32@oss.qualcomm.com> In-Reply-To: <20250815-itnoc-v1-0-62c8e4f7ad32@oss.qualcomm.com> To: Suzuki K Poulose , Mike Leach , James Clark , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Alexander Shishkin Cc: kernel@oss.qualcomm.com, 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, Yuanfang Zhang X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1755263906; l=1712; i=yuanfang.zhang@oss.qualcomm.com; s=20250814; h=from:subject:message-id; bh=VoTULuM+qkKhtoH0VvVKv4xTl4Eg+ARh+llu8sbZdVU=; b=MHmjSyMQH6lM1Al6lYIb9qEiX3Qzsc1kPylcTrr93fPHLt1T9KqS817xd/cNgObqMEKfE9h8q xkchO8pLcdeCb6jAMpw0wM3goJapo5eM5bZbfxP4fvBMDdKDJIcLZvH X-Developer-Key: i=yuanfang.zhang@oss.qualcomm.com; a=ed25519; pk=9oS/FoPW5k0CsqSDDrPlnV+kVIOUaAe0O5pr4M1wHgY= X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwODExMDA3NSBTYWx0ZWRfX8rwuvXKN4Vpc NkzgukGwYxmKCZM1VkMAQYnicVuBJnxrxuRn6Asmr3LlOm++AGkWIeExLGzscOBwqP8eyMAlkcf NLRkloUI03Id4Af2kLZCxA0cQOUtWb9GblDhzgrrwYDgXMpWvS0MfQJkDPf4bayW5vu3XiprYiS 33uYkrqxfPZvtNsE0Z9egW8GbCP4iCf1jyzmDSoLkOWP7jVoCA8jBDzBQ2uZGUplZegS93/SUCU bk1xOsZpYKjs//z4kV7Pj9vDoK6IcVcVca1OumFRnQeYyKZIG5wQ0W30bsGOcT2paeNKoW23tca KVeHnly/bb6pEVNhpf5aa8dLM/0bCxiRHR1G6CXkOfuX4qJ5cqZeRAr0WuUgZLWWRsjg0G062qR Wimm6hXI X-Authority-Analysis: v=2.4 cv=TLZFS0la c=1 sm=1 tr=0 ts=689f33a8 cx=c_pps a=WW5sKcV1LcKqjgzy2JUPuA==:117 a=ouPCqIW2jiPt+lZRy3xVPw==:17 a=IkcTkHD0fZMA:10 a=2OwXVqhp2XgA:10 a=EUspDBNiAAAA:8 a=txXwn6EqYov8MDno8JkA:9 a=QEXdDO2ut3YA:10 a=OpyuDcXvxspvyRM73sMx:22 X-Proofpoint-GUID: cegZVOT0Yxgd43Xt7jVpc65lTysoz1eJ X-Proofpoint-ORIG-GUID: cegZVOT0Yxgd43Xt7jVpc65lTysoz1eJ X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1099,Hydra:6.1.9,FMLib:17.12.80.40 definitions=2025-08-15_04,2025-08-14_01,2025-03-28_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 phishscore=0 malwarescore=0 spamscore=0 priorityscore=1501 bulkscore=0 adultscore=0 impostorscore=0 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2507300000 definitions=main-2508110075 This patch adds runtime power management support for platform-based CoreSight Interconnect TNOC (ITNOC) devices. It introduces suspend and resume callbacks to manage the APB clock (`pclk`) during device runtime transitions. Signed-off-by: Yuanfang Zhang --- drivers/hwtracing/coresight/coresight-tnoc.c | 26 ++++++++++++++++++++++++= ++ 1 file changed, 26 insertions(+) diff --git a/drivers/hwtracing/coresight/coresight-tnoc.c b/drivers/hwtraci= ng/coresight/coresight-tnoc.c index aa6f48d838c00d71eff22c18e34e00b93755fd82..f12a1698824bc678545319a3f48= 2fd27e67a7352 100644 --- a/drivers/hwtracing/coresight/coresight-tnoc.c +++ b/drivers/hwtracing/coresight/coresight-tnoc.c @@ -270,6 +270,31 @@ static void itnoc_remove(struct platform_device *pdev) pm_runtime_disable(&pdev->dev); } =20 +#ifdef CONFIG_PM +static int itnoc_runtime_suspend(struct device *dev) +{ + struct trace_noc_drvdata *drvdata =3D dev_get_drvdata(dev); + + clk_disable_unprepare(drvdata->pclk); + + return 0; +} + +static int itnoc_runtime_resume(struct device *dev) +{ + struct trace_noc_drvdata *drvdata =3D dev_get_drvdata(dev); + int ret; + + ret =3D clk_prepare_enable(drvdata->pclk); + + return ret; +} +#endif + +static const struct dev_pm_ops itnoc_dev_pm_ops =3D { + SET_RUNTIME_PM_OPS(itnoc_runtime_suspend, itnoc_runtime_resume, NULL) +}; + static const struct of_device_id itnoc_of_match[] =3D { { .compatible =3D "qcom,coresight-itnoc" }, {} @@ -282,6 +307,7 @@ static struct platform_driver itnoc_driver =3D { .driver =3D { .name =3D "coresight-itnoc", .of_match_table =3D itnoc_of_match, + .pm =3D &itnoc_dev_pm_ops, }, }; =20 --=20 2.34.1