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Mon, 08 Jul 2024 03:16:33 +0000 (GMT) Received: from nalasex01c.na.qualcomm.com (nalasex01c.na.qualcomm.com [10.47.97.35]) by NALASPPMTA04.qualcomm.com (8.17.1.19/8.17.1.19) with ESMTPS id 4683GWaQ002605 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 8 Jul 2024 03:16:32 GMT Received: from jiegan-gv.ap.qualcomm.com (10.80.80.8) by nalasex01c.na.qualcomm.com (10.47.97.35) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.9; Sun, 7 Jul 2024 20:16:26 -0700 Date: Mon, 8 Jul 2024 11:16:23 +0800 From: JieGan To: Krzysztof Kozlowski CC: Mathieu Poirier , Suzuki K Poulose , Alexander Shishkin , Mike Leach , "Rob Herring" , Krzysztof Kozlowski , James Clark , Jinlong Mao , Leo Yan , , , , , Tingwei Zhang , Yuanfang Zhang , "Tao Zhang" , Trilok Soni , "Song Chai" , Subject: Re: [PATCH v2 3/4] Coresight: Add Coresight Control Unit driver Message-ID: References: <20240705090049.1656986-1-quic_jiegan@quicinc.com> <20240705090049.1656986-4-quic_jiegan@quicinc.com> <9b502ba5-7042-424e-b0a2-5659e4064462@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <9b502ba5-7042-424e-b0a2-5659e4064462@linaro.org> X-Originating-IP: [10.80.80.8] X-ClientProxiedBy: nasanex01b.na.qualcomm.com (10.46.141.250) To nalasex01c.na.qualcomm.com (10.47.97.35) X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-GUID: ZAIsfCBzQoxETJFvt1uGg4ZiiXagjVHa X-Proofpoint-ORIG-GUID: ZAIsfCBzQoxETJFvt1uGg4ZiiXagjVHa X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1039,Hydra:6.0.680,FMLib:17.12.28.16 definitions=2024-07-07_10,2024-07-05_01,2024-05-17_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 bulkscore=0 lowpriorityscore=0 impostorscore=0 adultscore=0 suspectscore=0 phishscore=0 mlxlogscore=999 priorityscore=1501 malwarescore=0 spamscore=0 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2406140001 definitions=main-2407080025 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240707_201644_047319_7E0063CF X-CRM114-Status: GOOD ( 22.99 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Fri, Jul 05, 2024 at 11:11:19AM +0200, Krzysztof Kozlowski wrote: > On 05/07/2024 11:00, Jie Gan wrote: > > The Coresight Control Unit hosts miscellaneous configuration registers > > which control various features related to TMC ETR sink. > > > > Based on the trace ID, which is programmed in the related CCU ATID register > > of a specific ETR, trace data with that trace ID gets into the ETR buffer, > > .... > > > +static int ccu_probe(struct platform_device *pdev) > > +{ > > + struct device *dev = &pdev->dev; > > + struct coresight_platform_data *pdata; > > + struct ccu_drvdata *drvdata; > > + struct coresight_desc desc = { 0 }; > > + struct resource *res; > > + > > + desc.name = coresight_alloc_device_name(&ccu_devs, dev); > > + if (!desc.name) > > + return -ENOMEM; > > + pdata = coresight_get_platform_data(dev); > > + if (IS_ERR(pdata)) > > + return PTR_ERR(pdata); > > + pdev->dev.platform_data = pdata; > > + > > + drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL); > > + if (!drvdata) > > + return -ENOMEM; > > + drvdata->dev = &pdev->dev; > > Use stored dev variable. pdev->dev replaced by dev variable. > > > + drvdata->atid_offset = 0; > > + platform_set_drvdata(pdev, drvdata); > > + > > + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "ccu-base"); > > + if (!res) > > + return -ENODEV; > > + drvdata->pbase = res->start; > > Drop. Dropped. > > > + > > + drvdata->base = devm_ioremap(dev, res->start, resource_size(res)); > > Use proper wrapper for this two. Replaced by: res = platform_get_resource(pdev, IORESOURCE_MEM, 0); drvdata->base = devm_ioremap_resource(dev, res); > > > + if (!drvdata->base) > > + return -ENOMEM; > > + > > + desc.type = CORESIGHT_DEV_TYPE_HELPER; > > + desc.pdata = pdev->dev.platform_data; > > + desc.dev = &pdev->dev; > > + desc.ops = &ccu_ops; > > + > > + drvdata->csdev = coresight_register(&desc); > > + if (IS_ERR(drvdata->csdev)) > > + return PTR_ERR(drvdata->csdev); > > + > > + dev_dbg(dev, "CCU initialized: %s\n", desc.name); > > Drop. Dropped. > > > + return 0; > > +} > > + > > +static void ccu_remove(struct platform_device *pdev) > > +{ > > + struct ccu_drvdata *drvdata = platform_get_drvdata(pdev); > > + > > + coresight_unregister(drvdata->csdev); > > +} > > + > > +static const struct of_device_id ccu_match[] = { > > + {.compatible = "qcom,coresight-ccu"}, > > + {} > > +}; > > + > > +static struct platform_driver ccu_driver = { > > + .probe = ccu_probe, > > + .remove = ccu_remove, > > + .driver = { > > + .name = "coresight-ccu", > > + .of_match_table = ccu_match, > > + .suppress_bind_attrs = true, > > Why? Sorry, I dont get the point here. We dont need automatic bind/unbind, so the suppress_bind_attrs sets to true. We need configure some settings before we register the device. > > > + }, > > +}; > > + > > +static int __init ccu_init(void) > > +{ > > + return platform_driver_register(&ccu_driver); > > +} > > +module_init(ccu_init); > > + > > +static void __exit ccu_exit(void) > > +{ > > + platform_driver_unregister(&ccu_driver); > > +} > > +module_exit(ccu_exit); > > Why this is not just module platform driver? Replaced by module_platform_driver(ccu_driver); > > Best regards, > Krzysztof > Thanks, Jie