From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-17.6 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE, USER_AGENT_SANE_1 autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A8F68C4708F for ; Fri, 28 May 2021 07:24:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8DA0E611CD for ; Fri, 28 May 2021 07:24:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235780AbhE1HZu (ORCPT ); Fri, 28 May 2021 03:25:50 -0400 Received: from fllv0015.ext.ti.com ([198.47.19.141]:60792 "EHLO fllv0015.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234447AbhE1HZt (ORCPT ); Fri, 28 May 2021 03:25:49 -0400 Received: from lelv0266.itg.ti.com ([10.180.67.225]) by fllv0015.ext.ti.com (8.15.2/8.15.2) with ESMTP id 14S7O5Sk130782; Fri, 28 May 2021 02:24:05 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ti.com; s=ti-com-17Q1; t=1622186645; bh=nu/t+eRoAY6NtRobRU6f3fX1UwivEdiSbjMIVTJEhRI=; h=Date:From:To:CC:Subject:References:In-Reply-To; b=otvU6YfVvMb0VmTfNfLokxvoHGITg5Yqi+Bg+rqneUxQeQU2hHXR1nsy8ADTT+ODj UKffTmjq+TT/E03XgDbRKrsSR7kdKMa9jK1D8xYlG2KiTEailf5y6KtRIkpnTc1V3R BGUBsVhf6bxHEjX7l5zTRtw1lu6o95vdcNLI32pA= Received: from DLEE113.ent.ti.com (dlee113.ent.ti.com [157.170.170.24]) by lelv0266.itg.ti.com (8.15.2/8.15.2) with ESMTPS id 14S7O5U8036400 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=FAIL); Fri, 28 May 2021 02:24:05 -0500 Received: from DLEE101.ent.ti.com (157.170.170.31) by DLEE113.ent.ti.com (157.170.170.24) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2176.2; Fri, 28 May 2021 02:24:05 -0500 Received: from fllv0039.itg.ti.com (10.64.41.19) by DLEE101.ent.ti.com (157.170.170.31) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2176.2 via Frontend Transport; Fri, 28 May 2021 02:24:05 -0500 Received: from localhost (ileax41-snat.itg.ti.com [10.172.224.153]) by fllv0039.itg.ti.com (8.15.2/8.15.2) with ESMTP id 14S7O4dV114575; Fri, 28 May 2021 02:24:04 -0500 Date: Fri, 28 May 2021 12:54:03 +0530 From: Pratyush Yadav To: Tomi Valkeinen CC: Maxime Ripard , Mauro Carvalho Chehab , Rob Herring , Kishon Vijay Abraham I , Vinod Koul , Peter Ujfalusi , Steve Longerbeam , Benoit Parrot , , , , , , Vignesh Raghavendra , Chunfeng Yun , Laurent Pinchart Subject: Re: [PATCH v2 10/18] media: cadence: csi2rx: Populate subdev devnode Message-ID: <20210528072401.2vdrtjdiepnr72vv@ti.com> References: <20210526152308.16525-1-p.yadav@ti.com> <20210526152308.16525-11-p.yadav@ti.com> <9c38a72c-18e8-1e54-b3b4-85ff5d47857a@ideasonboard.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <9c38a72c-18e8-1e54-b3b4-85ff5d47857a@ideasonboard.com> User-Agent: NeoMutt/20171215 X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 28/05/21 10:16AM, Tomi Valkeinen wrote: > On 26/05/2021 18:23, Pratyush Yadav wrote: > > The devnode can be used by media-ctl and other userspace tools to > > perform configurations on the subdev. Without it, media-ctl returns > > ENOENT when setting format on the sensor subdev. > > > > Signed-off-by: Pratyush Yadav > > --- > > > > (no changes since v1) > > > > drivers/media/platform/cadence/cdns-csi2rx.c | 1 + > > 1 file changed, 1 insertion(+) > > > > diff --git a/drivers/media/platform/cadence/cdns-csi2rx.c b/drivers/media/platform/cadence/cdns-csi2rx.c > > index 1df21f462f3c..49bed63d5faa 100644 > > --- a/drivers/media/platform/cadence/cdns-csi2rx.c > > +++ b/drivers/media/platform/cadence/cdns-csi2rx.c > > @@ -613,6 +613,7 @@ static int csi2rx_probe(struct platform_device *pdev) > > csi2rx->pads[CSI2RX_PAD_SINK].flags = MEDIA_PAD_FL_SINK; > > for (i = CSI2RX_PAD_SOURCE_STREAM0; i < CSI2RX_PAD_MAX; i++) > > csi2rx->pads[i].flags = MEDIA_PAD_FL_SOURCE; > > + csi2rx->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE; > > ret = media_entity_pads_init(&csi2rx->subdev.entity, CSI2RX_PAD_MAX, > > csi2rx->pads); > > > > I don't understand this one. There's nothing to configure in cdns-csi2rx > from userspace, as far as I can see, so why is the dev node needed? And why > would the lack of csi2rx dev node cause sensor subdev config to fail? Sensor config does not fail. But when I run media-ctl to set the format on /dev/media0, I get an error message that comes because the devnode for the bridge does not exist. I was not 100% sure about this patch but I figured if media-ctl expects it then it should be exposed. I don't mind dropping this patch. Just want to make sure what the right thing to do here is. Should every element of the pipeline have a devnode or not? -- Regards, Pratyush Yadav Texas Instruments Inc.