From patchwork Fri Jun 5 13:05:17 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Benjamin GAIGNARD X-Patchwork-Id: 11589631 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id AB9F5618 for ; Fri, 5 Jun 2020 13:06:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9397120772 for ; Fri, 5 Jun 2020 13:06:17 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=st.com header.i=@st.com header.b="Z4GYj0TQ" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726888AbgFENFf (ORCPT ); Fri, 5 Jun 2020 09:05:35 -0400 Received: from mx07-00178001.pphosted.com ([62.209.51.94]:9042 "EHLO mx07-00178001.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726409AbgFENFe (ORCPT ); Fri, 5 Jun 2020 09:05:34 -0400 Received: from pps.filterd (m0046037.ppops.net [127.0.0.1]) by mx07-00178001.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id 055D1bHP018968; Fri, 5 Jun 2020 15:05:23 +0200 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=st.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-type; s=STMicroelectronics; bh=zWShjHdtkDP9KEzM3tiXokZkb+o6dSeLDNYRf6d3oDE=; b=Z4GYj0TQc1f6MOtkTmFK6S/f3uMm+wvORJbx7H3FMmxYmtnaTa8GimkP02LWoZwsVE/n Ian2xwt18A66qH+6np7F4MRW+71rty2yQj9AjI05BfMBH7eEuPwcEv2IZb/yuJaAIFG9 zU4BUy1NzTo8w0Y8fIIIlej5rrwNU2G3duM1QmnZv2o6FfBqDh1yysuigus2AXyDlKsl 5UMEiMER3RCwpRzS1jUAb6s9uXBN97fy9DLEJGaPQ5e0LRkhjHs5DVwH3Qn2rk0SmAKr TZzBQaaUgt75PRZTWzB6avIZqwNJGkCE5y+VWnDMPamoucPK34sILBuZBsiXrxtvX1nh nQ== Received: from beta.dmz-eu.st.com (beta.dmz-eu.st.com [164.129.1.35]) by mx07-00178001.pphosted.com with ESMTP id 31fat4kmg8-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 05 Jun 2020 15:05:23 +0200 Received: from euls16034.sgp.st.com (euls16034.sgp.st.com [10.75.44.20]) by beta.dmz-eu.st.com (STMicroelectronics) with ESMTP id EB8E3100034; Fri, 5 Jun 2020 15:05:22 +0200 (CEST) Received: from Webmail-eu.st.com (sfhdag3node3.st.com [10.75.127.9]) by euls16034.sgp.st.com (STMicroelectronics) with ESMTP id D676D2C50BE; Fri, 5 Jun 2020 15:05:22 +0200 (CEST) Received: from localhost (10.75.127.47) by SFHDAG3NODE3.st.com (10.75.127.9) with Microsoft SMTP Server (TLS) id 15.0.1347.2; Fri, 5 Jun 2020 15:05:22 +0200 From: Benjamin Gaignard To: , , , CC: , , , , , , , Benjamin Gaignard Subject: [PATCH v4 1/3] dt-bindings: media: stm32-dcmi: Add DCMI min frequency property Date: Fri, 5 Jun 2020 15:05:17 +0200 Message-ID: <20200605130519.4184-2-benjamin.gaignard@st.com> X-Mailer: git-send-email 2.15.0 In-Reply-To: <20200605130519.4184-1-benjamin.gaignard@st.com> References: <20200605130519.4184-1-benjamin.gaignard@st.com> MIME-Version: 1.0 X-Originating-IP: [10.75.127.47] X-ClientProxiedBy: SFHDAG4NODE2.st.com (10.75.127.11) To SFHDAG3NODE3.st.com (10.75.127.9) X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.216,18.0.687 definitions=2020-06-05_04:2020-06-04,2020-06-05 signatures=0 Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org Document st,stm32-dcmi-min-frequency property which is used to request CPUs minimum frequency when streaming frames. Signed-off-by: Benjamin Gaignard --- Documentation/devicetree/bindings/media/st,stm32-dcmi.yaml | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/Documentation/devicetree/bindings/media/st,stm32-dcmi.yaml b/Documentation/devicetree/bindings/media/st,stm32-dcmi.yaml index 3fe778cb5cc3..05ca85a2411a 100644 --- a/Documentation/devicetree/bindings/media/st,stm32-dcmi.yaml +++ b/Documentation/devicetree/bindings/media/st,stm32-dcmi.yaml @@ -44,6 +44,13 @@ properties: bindings defined in Documentation/devicetree/bindings/media/video-interfaces.txt. + st,stm32-dcmi-min-frequency: + description: DCMI minimum CPUs frequency requirement (in KHz). + allOf: + - $ref: /schemas/types.yaml#/definitions/uint32 + - minimum: 0 + - default: 0 + required: - compatible - reg @@ -71,6 +78,7 @@ examples: clock-names = "mclk"; dmas = <&dmamux1 75 0x400 0x0d>; dma-names = "tx"; + st,stm32-dcmi-min-frequency = <650000>; port { dcmi_0: endpoint { From patchwork Fri Jun 5 13:05:18 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Benjamin GAIGNARD X-Patchwork-Id: 11589623 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 9640C618 for ; Fri, 5 Jun 2020 13:05:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7729920772 for ; Fri, 5 Jun 2020 13:05:56 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=st.com header.i=@st.com header.b="Mg84Xrsz" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726941AbgFENFm (ORCPT ); Fri, 5 Jun 2020 09:05:42 -0400 Received: from mx08-00178001.pphosted.com ([91.207.212.93]:49686 "EHLO mx07-00178001.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726854AbgFENFg (ORCPT ); Fri, 5 Jun 2020 09:05:36 -0400 Received: from pps.filterd (m0046661.ppops.net [127.0.0.1]) by mx07-00178001.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id 055D2Ben001828; Fri, 5 Jun 2020 15:05:24 +0200 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=st.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-type; s=STMicroelectronics; bh=QrwYifnaOLog6U8uIZAk8yC8cpKaAcVpWSbrF+6BQTU=; b=Mg84XrszxxO41qed3UcPYuzoFUnaeYnvuyHo1qB+elYGzSYHRJKT/qFLPdF+wcy40xrt C3YPQYXrEaQRIcHb8AtkLsLw79P4aPqLM0QexDFGiHYlAEdKgzkpAGxJSC7YK5vOSI4Q LU63x/KMpRkshvHw3aH1qEZfa5iz/WLPv+8A89ztU6XKwpHf0hMqRCoH1QvKduoD4EWN UFC97cjqGztluX5fMC8BEj53ps4pC6UBV9RvTQszqLH9COTLYzBlLNqU5EXgl7pvkfsS HqEuPpMHslIUw3mP7MZh3Dqe/MpX7LKg9lOCF83dkQ3foSJSzTOGnA4xdrKdtbrw3LKk /Q== Received: from beta.dmz-eu.st.com (beta.dmz-eu.st.com [164.129.1.35]) by mx07-00178001.pphosted.com with ESMTP id 31faseuktr-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 05 Jun 2020 15:05:24 +0200 Received: from euls16034.sgp.st.com (euls16034.sgp.st.com [10.75.44.20]) by beta.dmz-eu.st.com (STMicroelectronics) with ESMTP id 2070E10002A; Fri, 5 Jun 2020 15:05:24 +0200 (CEST) Received: from Webmail-eu.st.com (sfhdag3node3.st.com [10.75.127.9]) by euls16034.sgp.st.com (STMicroelectronics) with ESMTP id 100422C50BE; Fri, 5 Jun 2020 15:05:24 +0200 (CEST) Received: from localhost (10.75.127.46) by SFHDAG3NODE3.st.com (10.75.127.9) with Microsoft SMTP Server (TLS) id 15.0.1347.2; Fri, 5 Jun 2020 15:05:23 +0200 From: Benjamin Gaignard To: , , , CC: , , , , , , , Benjamin Gaignard Subject: [PATCH v4 2/3] media: stm32-dcmi: Set minimum cpufreq requirement Date: Fri, 5 Jun 2020 15:05:18 +0200 Message-ID: <20200605130519.4184-3-benjamin.gaignard@st.com> X-Mailer: git-send-email 2.15.0 In-Reply-To: <20200605130519.4184-1-benjamin.gaignard@st.com> References: <20200605130519.4184-1-benjamin.gaignard@st.com> MIME-Version: 1.0 X-Originating-IP: [10.75.127.46] X-ClientProxiedBy: SFHDAG4NODE2.st.com (10.75.127.11) To SFHDAG3NODE3.st.com (10.75.127.9) X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.216,18.0.687 definitions=2020-06-05_04:2020-06-04,2020-06-05 signatures=0 Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org Before start streaming set cpufreq minimum frequency requirement. The cpufreq governor will adapt the frequencies and we will have no latency for handling interrupts. The frequency requirement is retrieved from the device-tree node. Signed-off-by: Benjamin Gaignard Reviewed-by: Valentin Schneider --- version 4: - simplify irq affinity handling by using only dcmi_irq_notifier_notify() drivers/media/platform/stm32/stm32-dcmi.c | 122 ++++++++++++++++++++++++++++-- 1 file changed, 114 insertions(+), 8 deletions(-) diff --git a/drivers/media/platform/stm32/stm32-dcmi.c b/drivers/media/platform/stm32/stm32-dcmi.c index b8931490b83b..c2389776a958 100644 --- a/drivers/media/platform/stm32/stm32-dcmi.c +++ b/drivers/media/platform/stm32/stm32-dcmi.c @@ -13,10 +13,13 @@ #include #include +#include +#include #include #include #include #include +#include #include #include #include @@ -99,6 +102,8 @@ enum state { #define OVERRUN_ERROR_THRESHOLD 3 +static DEFINE_PER_CPU(struct freq_qos_request, qos_req); + struct dcmi_graph_entity { struct v4l2_async_subdev asd; @@ -133,6 +138,7 @@ struct stm32_dcmi { struct resource *res; struct reset_control *rstc; int sequence; + int irq; struct list_head buffers; struct dcmi_buf *active; @@ -173,6 +179,10 @@ struct stm32_dcmi { struct media_device mdev; struct media_pad vid_cap_pad; struct media_pipeline pipeline; + + u32 min_frequency; + cpumask_var_t boosted; + struct irq_affinity_notify notify; }; static inline struct stm32_dcmi *notifier_to_dcmi(struct v4l2_async_notifier *n) @@ -722,6 +732,90 @@ static void dcmi_pipeline_stop(struct stm32_dcmi *dcmi) dcmi_pipeline_s_stream(dcmi, 0); } +static void dcmi_get_min_frequency(struct stm32_dcmi *dcmi) +{ + struct device_node *np = dcmi->mdev.dev->of_node; + + dcmi->min_frequency = FREQ_QOS_MIN_DEFAULT_VALUE; + + of_property_read_u32(np, "st,stm32-dcmi-min-frequency", + &dcmi->min_frequency); +} + +static void dcmi_irq_notifier_notify(struct irq_affinity_notify *notify, + const cpumask_t *mask) +{ + struct stm32_dcmi *dcmi = container_of(notify, + struct stm32_dcmi, + notify); + struct cpufreq_policy *p; + int cpu; + + /* + * For all boosted CPUs check if it is still the case + * if not remove the request + */ + for_each_cpu(cpu, dcmi->boosted) { + if (cpumask_test_cpu(cpu, mask)) + continue; + + p = cpufreq_cpu_get(cpu); + if (!p) + continue; + + freq_qos_remove_request(&per_cpu(qos_req, cpu)); + cpumask_andnot(dcmi->boosted, dcmi->boosted, p->cpus); + + cpufreq_cpu_put(p); + } + + /* + * For CPUs in the mask check if they are boosted if not add + * a request + */ + for_each_cpu(cpu, mask) { + if (cpumask_test_cpu(cpu, dcmi->boosted)) + continue; + + p = cpufreq_cpu_get(cpu); + if (!p) + continue; + + freq_qos_add_request(&p->constraints, &per_cpu(qos_req, cpu), + FREQ_QOS_MIN, dcmi->min_frequency); + cpumask_or(dcmi->boosted, dcmi->boosted, p->cpus); + cpufreq_cpu_put(p); + } +} + +static void dcmi_irq_notifier_release(struct kref *ref) +{ + /* + * This is required by affinity notifier. We don't have anything to + * free here. + */ +} + +static void dcmi_set_min_frequency(struct stm32_dcmi *dcmi, s32 freq) +{ + struct irq_affinity_notify *notify = &dcmi->notify; + + if (freq) { + dcmi_irq_notifier_notify(notify, + irq_get_affinity_mask(dcmi->irq)); + + notify->notify = dcmi_irq_notifier_notify; + notify->release = dcmi_irq_notifier_release; + irq_set_affinity_notifier(dcmi->irq, notify); + } else { + struct cpumask clear; + + irq_set_affinity_notifier(dcmi->irq, NULL); + cpumask_clear(&clear); + dcmi_irq_notifier_notify(notify, &clear); + } +} + static int dcmi_start_streaming(struct vb2_queue *vq, unsigned int count) { struct stm32_dcmi *dcmi = vb2_get_drv_priv(vq); @@ -736,11 +830,13 @@ static int dcmi_start_streaming(struct vb2_queue *vq, unsigned int count) goto err_release_buffers; } + dcmi_set_min_frequency(dcmi, dcmi->min_frequency); + ret = media_pipeline_start(&dcmi->vdev->entity, &dcmi->pipeline); if (ret < 0) { dev_err(dcmi->dev, "%s: Failed to start streaming, media pipeline start error (%d)\n", __func__, ret); - goto err_pm_put; + goto err_drop_qos; } ret = dcmi_pipeline_start(dcmi); @@ -835,7 +931,8 @@ static int dcmi_start_streaming(struct vb2_queue *vq, unsigned int count) err_media_pipeline_stop: media_pipeline_stop(&dcmi->vdev->entity); -err_pm_put: +err_drop_qos: + dcmi_set_min_frequency(dcmi, FREQ_QOS_MIN_DEFAULT_VALUE); pm_runtime_put(dcmi->dev); err_release_buffers: @@ -863,6 +960,8 @@ static void dcmi_stop_streaming(struct vb2_queue *vq) media_pipeline_stop(&dcmi->vdev->entity); + dcmi_set_min_frequency(dcmi, FREQ_QOS_MIN_DEFAULT_VALUE); + spin_lock_irq(&dcmi->irqlock); /* Disable interruptions */ @@ -1838,7 +1937,6 @@ static int dcmi_probe(struct platform_device *pdev) struct vb2_queue *q; struct dma_chan *chan; struct clk *mclk; - int irq; int ret = 0; match = of_match_device(of_match_ptr(stm32_dcmi_of_match), &pdev->dev); @@ -1879,9 +1977,9 @@ static int dcmi_probe(struct platform_device *pdev) dcmi->bus.bus_width = ep.bus.parallel.bus_width; dcmi->bus.data_shift = ep.bus.parallel.data_shift; - irq = platform_get_irq(pdev, 0); - if (irq <= 0) - return irq ? irq : -ENXIO; + dcmi->irq = platform_get_irq(pdev, 0); + if (dcmi->irq <= 0) + return dcmi->irq ? dcmi->irq : -ENXIO; dcmi->res = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!dcmi->res) { @@ -1895,11 +1993,12 @@ static int dcmi_probe(struct platform_device *pdev) return PTR_ERR(dcmi->regs); } - ret = devm_request_threaded_irq(&pdev->dev, irq, dcmi_irq_callback, + ret = devm_request_threaded_irq(&pdev->dev, dcmi->irq, + dcmi_irq_callback, dcmi_irq_thread, IRQF_ONESHOT, dev_name(&pdev->dev), dcmi); if (ret) { - dev_err(&pdev->dev, "Unable to request irq %d\n", irq); + dev_err(&pdev->dev, "Unable to request irq %d\n", dcmi->irq); return ret; } @@ -1930,6 +2029,9 @@ static int dcmi_probe(struct platform_device *pdev) dcmi->state = STOPPED; dcmi->dma_chan = chan; + if (!alloc_cpumask_var(&dcmi->boosted, GFP_KERNEL)) + return -ENODEV; + q = &dcmi->queue; dcmi->v4l2_dev.mdev = &dcmi->mdev; @@ -2022,6 +2124,8 @@ static int dcmi_probe(struct platform_device *pdev) dev_info(&pdev->dev, "Probe done\n"); + dcmi_get_min_frequency(dcmi); + platform_set_drvdata(pdev, dcmi); pm_runtime_enable(&pdev->dev); @@ -2049,6 +2153,8 @@ static int dcmi_remove(struct platform_device *pdev) pm_runtime_disable(&pdev->dev); + free_cpumask_var(dcmi->boosted); + v4l2_async_notifier_unregister(&dcmi->notifier); v4l2_async_notifier_cleanup(&dcmi->notifier); media_entity_cleanup(&dcmi->vdev->entity); From patchwork Fri Jun 5 13:05:19 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Benjamin GAIGNARD X-Patchwork-Id: 11589625 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 0B748159A for ; Fri, 5 Jun 2020 13:05:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DD95D20772 for ; Fri, 5 Jun 2020 13:05:58 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=st.com header.i=@st.com header.b="RiKGn1k8" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726917AbgFENFl (ORCPT ); Fri, 5 Jun 2020 09:05:41 -0400 Received: from mx07-00178001.pphosted.com ([62.209.51.94]:19996 "EHLO mx07-00178001.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726735AbgFENFf (ORCPT ); Fri, 5 Jun 2020 09:05:35 -0400 Received: from pps.filterd (m0046668.ppops.net [127.0.0.1]) by mx07-00178001.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id 055D2VRf024213; Fri, 5 Jun 2020 15:05:25 +0200 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=st.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-type; s=STMicroelectronics; bh=UV2eXHMfLb4/QtK9KJPbsnZv2k9uIAuEYmQYk8262qk=; b=RiKGn1k8pGhuEWzNuWjBbtxEnQzasCQ5waWTwL3TEQcZjYAB1Padx75Qdg+NNyxYxAQl 5WwG0NMUSFaB0Ky86OgzwTMjTIEDWaUxYkRFNgjCxanSdUg2TA+3ILcPPX19Z+eh7oh5 RmHDHx8bTXxrGsxJsz4Nm3O65obdvnjmmDc4C2+fhTYdWwpxt3VXG1MHIQxAcJi7P10I ipNrHlKoUaBwJoK56WiWXmqkwjrCTaYP/QRC4pFFYtsaggbvWm5+vPXNuqfYAQW2q+KX bNn8m/8awz06j3VUBxs83zLlgxSSEFJK2UYp9RG67jHpT+/EW+xFYY6tZpX27BWVsLZK OA== Received: from beta.dmz-eu.st.com (beta.dmz-eu.st.com [164.129.1.35]) by mx07-00178001.pphosted.com with ESMTP id 31fasmbmm8-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 05 Jun 2020 15:05:25 +0200 Received: from euls16034.sgp.st.com (euls16034.sgp.st.com [10.75.44.20]) by beta.dmz-eu.st.com (STMicroelectronics) with ESMTP id 372C810002A; Fri, 5 Jun 2020 15:05:25 +0200 (CEST) Received: from Webmail-eu.st.com (sfhdag3node3.st.com [10.75.127.9]) by euls16034.sgp.st.com (STMicroelectronics) with ESMTP id 295362C50BE; Fri, 5 Jun 2020 15:05:25 +0200 (CEST) Received: from localhost (10.75.127.47) by SFHDAG3NODE3.st.com (10.75.127.9) with Microsoft SMTP Server (TLS) id 15.0.1347.2; Fri, 5 Jun 2020 15:05:24 +0200 From: Benjamin Gaignard To: , , , CC: , , , , , , , Benjamin Gaignard Subject: [PATCH v4 3/3] ARM: dts: stm32: Set DCMI frequency requirement for stm32mp15x Date: Fri, 5 Jun 2020 15:05:19 +0200 Message-ID: <20200605130519.4184-4-benjamin.gaignard@st.com> X-Mailer: git-send-email 2.15.0 In-Reply-To: <20200605130519.4184-1-benjamin.gaignard@st.com> References: <20200605130519.4184-1-benjamin.gaignard@st.com> MIME-Version: 1.0 X-Originating-IP: [10.75.127.47] X-ClientProxiedBy: SFHDAG5NODE3.st.com (10.75.127.15) To SFHDAG3NODE3.st.com (10.75.127.9) X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.216,18.0.687 definitions=2020-06-05_04:2020-06-04,2020-06-05 signatures=0 Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org Make sure that CPUs will at least run at 650Mhz when streaming sensor frames. Signed-off-by: Benjamin Gaignard --- arch/arm/boot/dts/stm32mp151.dtsi | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/arm/boot/dts/stm32mp151.dtsi b/arch/arm/boot/dts/stm32mp151.dtsi index 3ea05ba48215..f6d7bf4f8231 100644 --- a/arch/arm/boot/dts/stm32mp151.dtsi +++ b/arch/arm/boot/dts/stm32mp151.dtsi @@ -1091,6 +1091,7 @@ clock-names = "mclk"; dmas = <&dmamux1 75 0x400 0x0d>; dma-names = "tx"; + st,stm32-dcmi-min-frequency = <650000>; status = "disabled"; };