From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from smtp2.macqel.be ([109.135.2.61]:53541 "EHLO smtp2.macqel.be" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726479AbeIUOmF (ORCPT ); Fri, 21 Sep 2018 10:42:05 -0400 Received: from localhost (localhost [127.0.0.1]) by smtp2.macqel.be (Postfix) with ESMTP id 0433E130D3E for ; Fri, 21 Sep 2018 10:54:12 +0200 (CEST) Received: from smtp2.macqel.be ([127.0.0.1]) by localhost (mail.macqel.be [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id DDhmf+zgsRIg for ; Fri, 21 Sep 2018 10:54:11 +0200 (CEST) Received: from frolo.macqel.be (frolo.macqel [10.1.40.73]) by smtp2.macqel.be (Postfix) with ESMTP id 5F936130D3A for ; Fri, 21 Sep 2018 10:54:11 +0200 (CEST) Date: Fri, 21 Sep 2018 10:54:11 +0200 From: Philippe De Muyter To: linux-media@vger.kernel.org Subject: ? recommended way to implement gain control Message-ID: <20180921085411.GA31130@frolo.macqel> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Sender: linux-media-owner@vger.kernel.org List-ID: Hi, I see there's an ongoing discussion about implementing gain control for imx208. I have a similar problem (in the sense that the documentation of V4L2_CID_GAIN does not answer my question). The IMX264 has only one gain control, ranging from 0 to 480, but the unit is 'tenth of dB'. How can I make that clear for a V4L2 client ? Best regards Philippe