From patchwork Mon May 6 17:52:53 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Laurent Pinchart X-Patchwork-Id: 13655863 Received: from perceval.ideasonboard.com (perceval.ideasonboard.com [213.167.242.64]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id F1899157499; Mon, 6 May 2024 17:53:11 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=213.167.242.64 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1715017993; cv=none; b=Vv3ZSnBu+4XjGFo3xfDK+hP5LYvXKaIouDXWbzpcKn0kVwoXeOOA2Zwzpv6stMopinHtVeScZIpVOM0ZVWwwO9rMaiT5EW1LivFtVELaO0FKzDlagKZBKmPLUXqmVogJaL6BvQNu1dgFseA7SkOHOKTheZz/LsMJ5WepdJpVesI= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1715017993; c=relaxed/simple; bh=mIh/pTz6ceChfPi6dv95WV6CGTKS5DENptkF4iVwPKo=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=WZzUtyLYp8aWXqR+VpRC87/8tTMPg38IfA2+iVMpAFn0SgSv0jQYXtOpzkL62/F22Utoh5wLHSnTIs9YRkGU8N8UDgeg1o6LBtERe5PnBIk8YPrOZ9tdS7ShJdPAP9cxR6cVlO2yKcX2/roua5VOXVHCMWE/ARDgYEPsZtYUTFQ= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=ideasonboard.com; spf=pass smtp.mailfrom=ideasonboard.com; dkim=pass (1024-bit key) header.d=ideasonboard.com header.i=@ideasonboard.com header.b=Y3Gv+UE1; arc=none smtp.client-ip=213.167.242.64 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=ideasonboard.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=ideasonboard.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=ideasonboard.com header.i=@ideasonboard.com header.b="Y3Gv+UE1" Received: from pendragon.ideasonboard.com (81-175-209-231.bb.dnainternet.fi [81.175.209.231]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id 2BD60114D; Mon, 6 May 2024 19:53:01 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1715017982; bh=mIh/pTz6ceChfPi6dv95WV6CGTKS5DENptkF4iVwPKo=; h=From:To:Cc:Subject:Date:From; b=Y3Gv+UE1yBxt/SPrFyoJ3WwpphafVNQv9C4zI18osqf/C+1ZxZNEX+388vgQGlzDa Rh5ZAJ056Ncuqt8I+5tE9n8XLGKIUsfaiFEtsXBQMLdtEKNhnGnf4ISnX12RLxyaU/ Vnl6zYBBasa+oz5WeEKwhnQCpiMQWmMwvl9AmvoU= From: Laurent Pinchart To: linux-media@vger.kernel.org Cc: linux-renesas-soc@vger.kernel.org, Sakari Ailus , Tomi Valkeinen , Hans Verkuil , Dafna Hirschfeld , linux-rockchip@lists.infradead.org Subject: [PATCH 0/2] media: v4l2-subdev: Support const-awareness in state accessors Date: Mon, 6 May 2024 20:52:53 +0300 Message-ID: <20240506175255.24394-1-laurent.pinchart+renesas@ideasonboard.com> X-Mailer: git-send-email 2.43.2 Precedence: bulk X-Mailing-List: linux-renesas-soc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Hello, This small patch series comes from a mild annoyance I experienced during a recent patch review, where I wanted to ask for a pointer to a v4l2_subdev_state used to access the state in a read-only fashion to be made const. This wasn't possible as the state accessors functions take a non-const state pointer, in order to return pointers to mutable formats and selection rectangles. Patch 1/2 improves the state accessors to support const states, in the same wait as the recently introduced container_of_const() macro. Bikeshedding of the internal macro and function names is expected. Patch 2/2 then shows how this can be used in one driver. Laurent Pinchart (2): media: v4l2-subdev: Provide const-aware subdev state accessors media: rkisp1: Mark subdev state pointers as const .../platform/rockchip/rkisp1/rkisp1-isp.c | 8 +-- .../platform/rockchip/rkisp1/rkisp1-resizer.c | 8 +-- drivers/media/v4l2-core/v4l2-subdev.c | 24 +++---- include/media/v4l2-subdev.h | 66 +++++++++++++------ 4 files changed, 65 insertions(+), 41 deletions(-) base-commit: e695668af8523b059127dfa8b261c76e7c9cde10