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=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,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 3B94DC43333 for ; Thu, 4 Mar 2021 00:11:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0855C64F55 for ; Thu, 4 Mar 2021 00:11:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1354792AbhCDALD (ORCPT ); Wed, 3 Mar 2021 19:11:03 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59152 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1392024AbhCCXAy (ORCPT ); Wed, 3 Mar 2021 18:00:54 -0500 Received: from perceval.ideasonboard.com (perceval.ideasonboard.com [IPv6:2001:4b98:dc2:55:216:3eff:fef7:d647]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 12244C0613D7; Wed, 3 Mar 2021 14:59:53 -0800 (PST) Received: from pendragon.ideasonboard.com (62-78-145-57.bb.dnainternet.fi [62.78.145.57]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id 461498DE; Wed, 3 Mar 2021 23:59:50 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1614812390; bh=FY7RDvOyDuyrLYN60fJkrRyy7oaq4NoG/d+IagzZCkE=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=c1prsOhxNcgaGbPAMiXowZ5sblQpnh9rqRIulCZ18EqXJ+M9skF3IW/PaNn6AIkV9 c3CGM+ca2xdWljuAt1sQ5ZXVdqF7rEm3yjO1py+/cd2rsKuOjMKi+wlFVsBftATpdL Ri7mltwwGcvuUp7wI6Qma6zKxxXg/HodfMM+6qfo= Date: Thu, 4 Mar 2021 00:59:21 +0200 From: Laurent Pinchart To: Jagan Teki Cc: Rob Herring , Andrzej Hajda , Neil Armstrong , Jonas Karlman , Jernej Skrabec , Sam Ravnborg , dri-devel , linux-kernel , devicetree , linux-amarula Subject: Re: [PATCH v3 1/2] dt-bindings: display: bridge: Add bindings for Chipone ICN6211 Message-ID: References: <20210214175211.105107-1-jagan@amarulasolutions.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Jagan, On Wed, Mar 03, 2021 at 08:08:35PM +0530, Jagan Teki wrote: > On Wed, Feb 24, 2021 at 6:44 PM Laurent Pinchart wrote: > > On Wed, Feb 24, 2021 at 06:07:43PM +0530, Jagan Teki wrote: > > > On Mon, Feb 15, 2021 at 5:48 PM Laurent Pinchart wrote: > > > > On Sun, Feb 14, 2021 at 11:22:10PM +0530, Jagan Teki wrote: > > > > > ICN6211 is MIPI-DSI to RGB Convertor bridge from Chipone. > > > > > > > > > > It has a flexible configuration of MIPI DSI signal input and > > > > > produce RGB565, RGB666, RGB888 output format. > > > > > > > > > > Add dt-bingings for it. > > > > > > > > > > Signed-off-by: Jagan Teki > > > > > --- > > > > > Changes for v3: > > > > > - updated to new dt-bindings style > > > > > > > > > > .../display/bridge/chipone,icn6211.yaml | 90 +++++++++++++++++++ > > > > > 1 file changed, 90 insertions(+) > > > > > create mode 100644 Documentation/devicetree/bindings/display/bridge/chipone,icn6211.yaml > > > > > > > > > > diff --git a/Documentation/devicetree/bindings/display/bridge/chipone,icn6211.yaml b/Documentation/devicetree/bindings/display/bridge/chipone,icn6211.yaml > > > > > new file mode 100644 > > > > > index 000000000000..13764f13fe46 > > > > > --- /dev/null > > > > > +++ b/Documentation/devicetree/bindings/display/bridge/chipone,icn6211.yaml > > > > > @@ -0,0 +1,90 @@ > > > > > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) > > > > > +%YAML 1.2 > > > > > +--- > > > > > +$id: http://devicetree.org/schemas/display/bridge/chipone,icn6211.yaml# > > > > > +$schema: http://devicetree.org/meta-schemas/core.yaml# > > > > > + > > > > > +title: Chipone ICN6211 MIPI-DSI to RGB Converter bridge > > > > > + > > > > > +maintainers: > > > > > + - Jagan Teki > > > > > + > > > > > +description: | > > > > > + ICN6211 is MIPI-DSI to RGB Convertor bridge from chipone. > > > > > + > > > > > + It has a flexible configuration of MIPI DSI signal input and > > > > > + produce RGB565, RGB666, RGB888 output format. > > > > > > > > How does one select between the output formats ? Should the output > > > > connection option be described in the device tree ? > > > > > > I think that is a good option to select output formats via dts. what > > > if it makes it a generic property like data-lanes? since it is common > > > across many other bridges. > > > > Describing the output connection in the device tree sounds like a good > > idea indeed. The bus-width property could be used for this, maybe along > > the lines of > > https://lore.kernel.org/dri-devel/20201013020619.GG3942@pendragon.ideasonboard.com/. > > I have seen an issue by passing bus-width where the same bus-with 24 > can use by RGB888 and RGB666 according to > mipi_dsi_pixel_format_to_bpp. Having a default RGB888 format now and > update it when it supports properly, can be a good Idea I thought of. > Let me know if you have any comments? I'm fine with hardcoding a default for now. If a given bus wiring (which is described in DT by bus-width) can transport different formats, that's something that should be configured dynamically, either by querying what format a sink (such as a panel) requires, or if both the source and the sink can support different formats, possibly by involving userspace in the selection. -- Regards, Laurent Pinchart 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=-13.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham 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 6FE35C433E6 for ; Wed, 3 Mar 2021 22:59:55 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id E34D464EFD for ; Wed, 3 Mar 2021 22:59:54 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E34D464EFD Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=ideasonboard.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=dri-devel-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id CCD6E6E1F3; Wed, 3 Mar 2021 22:59:53 +0000 (UTC) Received: from perceval.ideasonboard.com (perceval.ideasonboard.com [IPv6:2001:4b98:dc2:55:216:3eff:fef7:d647]) by gabe.freedesktop.org (Postfix) with ESMTPS id 718566E1F3 for ; Wed, 3 Mar 2021 22:59:52 +0000 (UTC) Received: from pendragon.ideasonboard.com (62-78-145-57.bb.dnainternet.fi [62.78.145.57]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id 461498DE; Wed, 3 Mar 2021 23:59:50 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1614812390; bh=FY7RDvOyDuyrLYN60fJkrRyy7oaq4NoG/d+IagzZCkE=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=c1prsOhxNcgaGbPAMiXowZ5sblQpnh9rqRIulCZ18EqXJ+M9skF3IW/PaNn6AIkV9 c3CGM+ca2xdWljuAt1sQ5ZXVdqF7rEm3yjO1py+/cd2rsKuOjMKi+wlFVsBftATpdL Ri7mltwwGcvuUp7wI6Qma6zKxxXg/HodfMM+6qfo= Date: Thu, 4 Mar 2021 00:59:21 +0200 From: Laurent Pinchart To: Jagan Teki Subject: Re: [PATCH v3 1/2] dt-bindings: display: bridge: Add bindings for Chipone ICN6211 Message-ID: References: <20210214175211.105107-1-jagan@amarulasolutions.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: devicetree , Jernej Skrabec , Jonas Karlman , linux-amarula , Neil Armstrong , linux-kernel , dri-devel , Andrzej Hajda , Rob Herring , Sam Ravnborg Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Hi Jagan, On Wed, Mar 03, 2021 at 08:08:35PM +0530, Jagan Teki wrote: > On Wed, Feb 24, 2021 at 6:44 PM Laurent Pinchart wrote: > > On Wed, Feb 24, 2021 at 06:07:43PM +0530, Jagan Teki wrote: > > > On Mon, Feb 15, 2021 at 5:48 PM Laurent Pinchart wrote: > > > > On Sun, Feb 14, 2021 at 11:22:10PM +0530, Jagan Teki wrote: > > > > > ICN6211 is MIPI-DSI to RGB Convertor bridge from Chipone. > > > > > > > > > > It has a flexible configuration of MIPI DSI signal input and > > > > > produce RGB565, RGB666, RGB888 output format. > > > > > > > > > > Add dt-bingings for it. > > > > > > > > > > Signed-off-by: Jagan Teki > > > > > --- > > > > > Changes for v3: > > > > > - updated to new dt-bindings style > > > > > > > > > > .../display/bridge/chipone,icn6211.yaml | 90 +++++++++++++++++++ > > > > > 1 file changed, 90 insertions(+) > > > > > create mode 100644 Documentation/devicetree/bindings/display/bridge/chipone,icn6211.yaml > > > > > > > > > > diff --git a/Documentation/devicetree/bindings/display/bridge/chipone,icn6211.yaml b/Documentation/devicetree/bindings/display/bridge/chipone,icn6211.yaml > > > > > new file mode 100644 > > > > > index 000000000000..13764f13fe46 > > > > > --- /dev/null > > > > > +++ b/Documentation/devicetree/bindings/display/bridge/chipone,icn6211.yaml > > > > > @@ -0,0 +1,90 @@ > > > > > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) > > > > > +%YAML 1.2 > > > > > +--- > > > > > +$id: http://devicetree.org/schemas/display/bridge/chipone,icn6211.yaml# > > > > > +$schema: http://devicetree.org/meta-schemas/core.yaml# > > > > > + > > > > > +title: Chipone ICN6211 MIPI-DSI to RGB Converter bridge > > > > > + > > > > > +maintainers: > > > > > + - Jagan Teki > > > > > + > > > > > +description: | > > > > > + ICN6211 is MIPI-DSI to RGB Convertor bridge from chipone. > > > > > + > > > > > + It has a flexible configuration of MIPI DSI signal input and > > > > > + produce RGB565, RGB666, RGB888 output format. > > > > > > > > How does one select between the output formats ? Should the output > > > > connection option be described in the device tree ? > > > > > > I think that is a good option to select output formats via dts. what > > > if it makes it a generic property like data-lanes? since it is common > > > across many other bridges. > > > > Describing the output connection in the device tree sounds like a good > > idea indeed. The bus-width property could be used for this, maybe along > > the lines of > > https://lore.kernel.org/dri-devel/20201013020619.GG3942@pendragon.ideasonboard.com/. > > I have seen an issue by passing bus-width where the same bus-with 24 > can use by RGB888 and RGB666 according to > mipi_dsi_pixel_format_to_bpp. Having a default RGB888 format now and > update it when it supports properly, can be a good Idea I thought of. > Let me know if you have any comments? I'm fine with hardcoding a default for now. If a given bus wiring (which is described in DT by bus-width) can transport different formats, that's something that should be configured dynamically, either by querying what format a sink (such as a panel) requires, or if both the source and the sink can support different formats, possibly by involving userspace in the selection. -- Regards, Laurent Pinchart _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel