From patchwork Thu Oct 15 18:27:05 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jacopo Mondi X-Patchwork-Id: 11839711 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 A365A14B5 for ; Thu, 15 Oct 2020 16:28:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8D3E922255 for ; Thu, 15 Oct 2020 16:28:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389731AbgJOQ1k (ORCPT ); Thu, 15 Oct 2020 12:27:40 -0400 Received: from relay9-d.mail.gandi.net ([217.70.183.199]:40973 "EHLO relay9-d.mail.gandi.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389699AbgJOQ1j (ORCPT ); Thu, 15 Oct 2020 12:27:39 -0400 X-Originating-IP: 93.34.118.233 Received: from uno.lan (93-34-118-233.ip49.fastwebnet.it [93.34.118.233]) (Authenticated sender: jacopo@jmondi.org) by relay9-d.mail.gandi.net (Postfix) with ESMTPSA id 63BA7FF804; Thu, 15 Oct 2020 16:27:36 +0000 (UTC) From: Jacopo Mondi To: kieran.bingham+renesas@ideasonboard.com, laurent.pinchart+renesas@ideasonboard.com, niklas.soderlund+renesas@ragnatech.se Cc: Jacopo Mondi , linux-media@vger.kernel.org, linux-renesas-soc@vger.kernel.org, linux-kernel@vger.kernel.org, Hyun Kwon , Manivannan Sadhasivam Subject: [PATCH v2 2/7] dt-bindings: media: max9286: Document 'maxim,high-threshold' Date: Thu, 15 Oct 2020 20:27:05 +0200 Message-Id: <20201015182710.54795-3-jacopo+renesas@jmondi.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20201015182710.54795-1-jacopo+renesas@jmondi.org> References: <20201015182710.54795-1-jacopo+renesas@jmondi.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org Document the 'maxim,high-threshold' vendor property in the bindings document of the max9286 driver. The newly introduced boolean property allows controlling the initial configuration of the GMSL reverse control channel to accommodate remote serializers pre-programmed with the high threshold power supply noise immunity enabled. Signed-off-by: Jacopo Mondi --- .../bindings/media/i2c/maxim,max9286.yaml | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/Documentation/devicetree/bindings/media/i2c/maxim,max9286.yaml b/Documentation/devicetree/bindings/media/i2c/maxim,max9286.yaml index 9ea827092fdd..50e08a7d3204 100644 --- a/Documentation/devicetree/bindings/media/i2c/maxim,max9286.yaml +++ b/Documentation/devicetree/bindings/media/i2c/maxim,max9286.yaml @@ -51,6 +51,19 @@ properties: '#gpio-cells': const: 2 + maxim,high-threshold: + description: | + A boolean property to increase the initial amplitude of the reverse + control channel to compensate for remote serializers pre-programmed with + high threshold noise-immunity. + + Some camera modules (in example the RDACM20 one) include an on-board MCU + that pre-programs the embedded serializer with reverse channel power + supply noise immunity enabled. The deserializer shall increase its + reverse channel amplitude to compensate that and be able to communicate + with the remote end. + type: boolean + ports: type: object description: | @@ -243,6 +256,8 @@ examples: gpio-controller; #gpio-cells = <2>; + maxim,high-threshold; + ports { #address-cells = <1>; #size-cells = <0>;