From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from bombadil.infradead.org ([198.137.202.133]:53652 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752035AbeF1Lhk (ORCPT ); Thu, 28 Jun 2018 07:37:40 -0400 Date: Thu, 28 Jun 2018 08:37:32 -0300 From: Mauro Carvalho Chehab To: Niklas =?UTF-8?B?U8O2ZGVybHVuZA==?= Cc: Hans Verkuil , linux-media@vger.kernel.org, linux-renesas-soc@vger.kernel.org Subject: Re: [PATCH v2 2/2] v4l: Add support for STD ioctls on subdev nodes Message-ID: <20180628083732.3679d730@coco.lan> In-Reply-To: <20180517143016.13501-3-niklas.soderlund+renesas@ragnatech.se> References: <20180517143016.13501-1-niklas.soderlund+renesas@ragnatech.se> <20180517143016.13501-3-niklas.soderlund+renesas@ragnatech.se> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Sender: linux-media-owner@vger.kernel.org List-ID: Em Thu, 17 May 2018 16:30:16 +0200 Niklas S=C3=B6derlund escre= veu: > There is no way to control the standard of subdevices which are part of > a media device. The ioctls which exists all target video devices > explicitly and the idea is that the video device should talk to the > subdevice. For subdevices part of a media graph this is not possible and > the standard must be controlled on the subdev device directly. Why isn't it possible? A media pipeline should have at least a video devnode where the standard ioctls will be issued. So, I don't see why you would need to explicitly set the standard inside a sub-device. The way I see, inside a given pipeline, all subdevs should be using the same video standard (maybe except for a m2m device with would have some coded that would be doing format conversion). Am I missing something? Thanks, Mauro