From patchwork Thu Feb 3 17:50:00 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jean-Michel Hautbois X-Patchwork-Id: 12734505 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 448CDC43217 for ; Thu, 3 Feb 2022 17:50:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1353140AbiBCRug (ORCPT ); Thu, 3 Feb 2022 12:50:36 -0500 Received: from perceval.ideasonboard.com ([213.167.242.64]:59048 "EHLO perceval.ideasonboard.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1353089AbiBCRua (ORCPT ); Thu, 3 Feb 2022 12:50:30 -0500 Received: from tatooine.ideasonboard.com (unknown [IPv6:2a01:e0a:169:7140:5173:4d3f:4ddc:2012]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id 91859D88; Thu, 3 Feb 2022 18:50:25 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1643910625; bh=pOuthGxGMpzOZMVoj+0IAETXXuv85t6W6FbwTwO/s1Y=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=gvoBHIOrb/XbhdH4kXqJrsQ4wD1Df0hSyANBC/gh0eA7o1oenwUYnTX0j1eEf90Kl FCRB8eH79XReML2mk35ugUdb+j1DU2xN72tNHP3MwT8mTWTaI5TobeyX2aMY4X21TK FMpCJpOxs3VziHfyw3pqa9EFKYwW6I3DWmU/I6Z4= From: Jean-Michel Hautbois To: jeanmichel.hautbois@ideasonboard.com Cc: dave.stevenson@raspberrypi.com, devicetree@vger.kernel.org, kernel-list@raspberrypi.com, laurent.pinchart@ideasonboard.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, linux-rpi-kernel@lists.infradead.org, lukasz@jany.st, mchehab@kernel.org, naush@raspberrypi.com, robh@kernel.org, tomi.valkeinen@ideasonboard.com, nsaenz@kernel.org, bcm-kernel-feedback-list@broadcom.com Subject: [RFC PATCH v4 03/12] dt-bindings: media: Add bindings for bcm2835-unicam Date: Thu, 3 Feb 2022 18:50:00 +0100 Message-Id: <20220203175009.558868-4-jeanmichel.hautbois@ideasonboard.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20220203175009.558868-1-jeanmichel.hautbois@ideasonboard.com> References: <20220203175009.558868-1-jeanmichel.hautbois@ideasonboard.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org Introduce the dt-bindings documentation for bcm2835 CCP2/CSI2 Unicam camera interface. Also add a MAINTAINERS entry for it. Signed-off-by: Dave Stevenson Signed-off-by: Naushir Patuck Signed-off-by: Jean-Michel Hautbois Reviewed-by: Laurent Pinchart --- v4: - make MAINTAINERS its own patch - describe the reg and clocks correctly - use a vendor entry for the number of data lanes --- .../bindings/media/brcm,bcm2835-unicam.yaml | 110 ++++++++++++++++++ 1 file changed, 110 insertions(+) create mode 100644 Documentation/devicetree/bindings/media/brcm,bcm2835-unicam.yaml diff --git a/Documentation/devicetree/bindings/media/brcm,bcm2835-unicam.yaml b/Documentation/devicetree/bindings/media/brcm,bcm2835-unicam.yaml new file mode 100644 index 000000000000..0725a0267c60 --- /dev/null +++ b/Documentation/devicetree/bindings/media/brcm,bcm2835-unicam.yaml @@ -0,0 +1,110 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/media/brcm,bcm2835-unicam.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Broadcom BCM283x Camera Interface (Unicam) + +maintainers: + - Raspberry Pi Kernel Maintenance + +description: |- + The Unicam block on BCM283x SoCs is the receiver for either + CSI-2 or CCP2 data from image sensors or similar devices. + + The main platform using this SoC is the Raspberry Pi family of boards. + On the Pi the VideoCore firmware can also control this hardware block, + and driving it from two different processors will cause issues. + To avoid this, the firmware checks the device tree configuration + during boot. If it finds device tree nodes starting by csi then + it will stop the firmware accessing the block, and it can then + safely be used via the device tree binding. + +properties: + compatible: + const: brcm,bcm2835-unicam + + reg: + items: + - description: Unicam block. + - description: Clock Manager Image (CMI) block. + + interrupts: + maxItems: 1 + + clocks: + items: + - description: Clock to drive the LP state machine of Unicam. + - description: Clock for the vpu (core clock). + + clock-names: + items: + - const: lp + - const: vpu + + power-domains: + items: + - description: Unicam power domain + + brcm,num-data-lanes: + $ref: /schemas/types.yaml#/definitions/uint32 + enum: [ 2, 4 ] + description: Number of data lanes on the csi bus + + port: + additionalProperties: false + $ref: /schemas/graph.yaml#/$defs/port-base + + properties: + endpoint: + $ref: /schemas/media/video-interfaces.yaml# + unevaluatedProperties: false + + properties: + data-lanes: true + link-frequencies: true + + required: + - data-lanes + - link-frequencies + + required: + - endpoint + +required: + - compatible + - reg + - interrupts + - clocks + - clock-names + - power-domains + - brcm,num-data-lanes + - port + +additionalProperties: False + +examples: + - | + #include + #include + #include + csi1: csi@7e801000 { + compatible = "brcm,bcm2835-unicam"; + reg = <0x7e801000 0x800>, + <0x7e802004 0x4>; + interrupts = ; + clocks = <&clocks BCM2835_CLOCK_CAM1>, + <&firmware_clocks 4>; + clock-names = "lp", "vpu"; + power-domains = <&power RPI_POWER_DOMAIN_UNICAM1>; + brcm,num-data-lanes = <2>; + port { + csi1_ep: endpoint { + remote-endpoint = <&imx219_0>; + data-lanes = <1 2>; + link-frequencies = /bits/ 64 <456000000>; + }; + }; + }; +...