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=-14.0 required=3.0 tests=BAYES_00,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 36078C63777 for ; Mon, 30 Nov 2020 22:01:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DE69120857 for ; Mon, 30 Nov 2020 22:01:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730345AbgK3WBk (ORCPT ); Mon, 30 Nov 2020 17:01:40 -0500 Received: from mail-io1-f68.google.com ([209.85.166.68]:39435 "EHLO mail-io1-f68.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725893AbgK3WBj (ORCPT ); Mon, 30 Nov 2020 17:01:39 -0500 Received: by mail-io1-f68.google.com with SMTP id j23so13459879iog.6; Mon, 30 Nov 2020 14:01:18 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=ffuQXfxj9ttApqDQouaRNFwUbz09D8Tq1jiRM6FWfMg=; b=q6LqRfdA4ekfH5vxTYQFpcaDYCLU3XqQ6byUrhQxAOfTAet701s0q/XePLxzov8uwE MMoVUyC31TNaU51GNLUc4yY8H20IHVfFZTg52UvDxlb2xr6RFzRTicuHnyejEes7eGiN pNq65WOH0enTLycu7ojKLFTTuZU4ZWN+XFRBgDQfjJtF04cPVmAAVZv2xmJcXFPt0nV9 1T6GKnzpnZkN8tRnm7sWl3ec3OcJeULvCgTE8Dx4I/CEDsScAFjVRTEwWJ8+LJekuLVe XpkwRdSxlyvcDos7uQ7B+KoxjTYgnuaS8sBylfPpGTdEHkN7nZfr69OGson6vz4u+E06 ZWeQ== X-Gm-Message-State: AOAM530pjkaNELOeczaLbC5PWwtTzqCEh1Wo4fMcT4gow1+vSWp3MDxg NLw8pflZjGS/ncCWEEAqIZ65vpuidQ== X-Google-Smtp-Source: ABdhPJxiaNzQxKcsJ+2ju8yv8UTh5NosHoYLiQSGl/ZBfcKv//ZlASW+xpxCOe4xrbnIpEdt5dBHKw== X-Received: by 2002:a5d:9a03:: with SMTP id s3mr17782095iol.20.1606773652684; Mon, 30 Nov 2020 14:00:52 -0800 (PST) Received: from xps15 ([64.188.179.253]) by smtp.gmail.com with ESMTPSA id o195sm11503722ila.38.2020.11.30.14.00.49 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 30 Nov 2020 14:00:51 -0800 (PST) Received: (nullmailer pid 3106913 invoked by uid 1000); Mon, 30 Nov 2020 22:00:48 -0000 Date: Mon, 30 Nov 2020 15:00:48 -0700 From: Rob Herring To: Jacopo Mondi Cc: kieran.bingham+renesas@ideasonboard.com, laurent.pinchart+renesas@ideasonboard.com, niklas.soderlund+renesas@ragnatech.se, geert@linux-m68k.org, devicetree@vger.kernel.org, linux-media@vger.kernel.org, linux-renesas-soc@vger.kernel.org, linux-kernel@vger.kernel.org, Hyun Kwon , Manivannan Sadhasivam , sergei.shtylyov@gmail.com Subject: Re: [PATCH v5 2/8] dt-bindings: media: max9286: Document 'maxim,initial-reverse-channel-mV' Message-ID: <20201130220048.GA3104550@robh.at.kernel.org> References: <20201116135305.81319-1-jacopo+renesas@jmondi.org> <20201116135305.81319-3-jacopo+renesas@jmondi.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20201116135305.81319-3-jacopo+renesas@jmondi.org> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Nov 16, 2020 at 02:52:59PM +0100, Jacopo Mondi wrote: > Document the 'initial-reverse-channel-mV' vendor property in the > bindings document of the max9286 driver. > > The newly introduced property allows to specifying the initial > configuration of the GMSL reverse control channel to accommodate > remote serializers pre-programmed with the high threshold power > supply noise immunity enabled. > > Reviewed-by: Kieran Bingham > Signed-off-by: Jacopo Mondi > --- > .../bindings/media/i2c/maxim,max9286.yaml | 23 +++++++++++++++++++ > 1 file changed, 23 insertions(+) > > diff --git a/Documentation/devicetree/bindings/media/i2c/maxim,max9286.yaml b/Documentation/devicetree/bindings/media/i2c/maxim,max9286.yaml > index 9ea827092fdd..f61234d204fa 100644 > --- a/Documentation/devicetree/bindings/media/i2c/maxim,max9286.yaml > +++ b/Documentation/devicetree/bindings/media/i2c/maxim,max9286.yaml > @@ -51,6 +51,26 @@ properties: > '#gpio-cells': > const: 2 > > + maxim,initial-reverse-channel-mV: Use standard unit suffix. > + $ref: '/schemas/types.yaml#/definitions/uint32' > + minimum: 30 > + maximum: 200 > + default: 170 > + description: | > + Initial amplitude of the reverse control channel, in millivolts. > + > + The initial amplitude shall be adjusted to a value compatible with the > + configuration of the connected remote serializer. > + > + Some camera modules (for example RDACM20) include an on-board MCU that > + pre-programs the embedded serializer with power supply noise immunity > + (high-threshold) enabled. A typical value of the deserializer's reverse > + channel amplitude to communicate with pre-programmed serializers is 170mV. > + > + A typical value for the reverse channel amplitude to communicate with > + a remote serializer whose high-threshold noise immunity is not enabled > + is 100mV. > + > ports: > type: object > description: | > @@ -221,6 +241,7 @@ required: > - ports > - i2c-mux > - gpio-controller > + - maxim,initial-reverse-channel-mV > > additionalProperties: false > > @@ -243,6 +264,8 @@ examples: > gpio-controller; > #gpio-cells = <2>; > > + maxim,initial-reverse-channel-mV = <170>; > + > ports { > #address-cells = <1>; > #size-cells = <0>; > -- > 2.29.1 >