linux-kernel - Re: [V3, 3/4] Documentation: dt-bindings: media: Document bindings for DW MIPI CSI-2 Host

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Date:   Fri, 11 Jan 2019 15:29:03 +0000
From:   <Eugen.Hristev@...rochip.com>
To:     <luis.oliveira@...opsys.com>, <linux-media@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
CC:     <joao.pinto@...opsys.com>, <festevam@...il.com>,
        <mchehab@...nel.org>, <robh+dt@...nel.org>, <mark.rutland@....com>,
        <hans.verkuil@...co.com>,
        <laurent.pinchart+renesas@...asonboard.com>, <arnd@...db.de>,
        <geert+renesas@...der.be>, <narmstrong@...libre.com>,
        <p.zabel@...gutronix.de>, <keiichiw@...omium.org>,
        <kstewart@...uxfoundation.org>, <todor.tomov@...aro.org>,
        <devicetree@...r.kernel.org>
Subject: Re: [V3, 3/4] Documentation: dt-bindings: media: Document bindings
 for DW MIPI CSI-2 Host



On 19.10.2018 15:52, Luis Oliveira wrote:
> Add bindings for Synopsys DesignWare MIPI CSI-2 host.
> 
> Signed-off-by: Luis Oliveira <lolivei@...opsys.com>
> ---
> Changelog
> v2-V3
> - removed IPI settings
> 
>   .../devicetree/bindings/media/snps,dw-csi-plat.txt | 52 ++++++++++++++++++++++
>   1 file changed, 52 insertions(+)
>   create mode 100644 Documentation/devicetree/bindings/media/snps,dw-csi-plat.txt
> 
> diff --git a/Documentation/devicetree/bindings/media/snps,dw-csi-plat.txt b/Documentation/devicetree/bindings/media/snps,dw-csi-plat.txt
> new file mode 100644
> index 0000000..be3da05
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/media/snps,dw-csi-plat.txt
> @@ -0,0 +1,52 @@
> +Synopsys DesignWare CSI-2 Host controller
> +
> +Description
> +-----------
> +
> +This HW block is used to receive image coming from an MIPI CSI-2 compatible
> +camera.
> +
> +Required properties:
> +- compatible: shall be "snps,dw-csi-plat"
> +- reg			: physical base address and size of the device memory mapped
> +  registers;
> +- interrupts		: CSI-2 Host interrupt
> +- snps,output-type	: Core output to be used (IPI-> 0 or IDI->1 or BOTH->2)
> +			  These  values choose which of the Core outputs will be used,
> +			  it can be Image Data Interface or Image Pixel Interface.
> +- phys			: List of one PHY specifier (as defined in
> +			  Documentation/devicetree/bindings/phy/phy-bindings.txt).
> +			  This PHY is a MIPI DPHY working in RX mode.
> +- resets		: Reference to a reset controller (optional)
> +
> +The per-board settings:
> + - port sub-node describing a single endpoint connected to the camera as
> +   described in video-interfaces.txt[1].
> +
> +Example:
> +
> +	csi2_1: csi2@...0 {
> +		compatible = "snps,dw-csi-plat";
> +		#address-cells = <1>;
> +		#size-cells = <0>;
> +		reg = < 0x03000 0x7FF>;
> +		interrupts = <2>;
> +		output-type = <2>;
> +		resets = <&dw_rst 1>;
> +		phys = <&mipi_dphy_rx1 0>;
> +		phy-names = "csi2-dphy";
> +
> +		/* CSI-2 per-board settings */
> +		port@1 {
> +			reg = <1>;
> +			csi1_ep1: endpoint {
> +				remote-endpoint = <&camera_1>;
> +				data-lanes = <1 2>;
> +			};
> +		};
> +		port@2 {
> +			csi1_ep2: endpoint {
> +				remote-endpoint = <&vif1_ep>;

Hi again Luis,

Regarding the output endpoint, in your example port@2, if we use the 
property snps,output-type=2 for example, so IDI output, which bus-type 
you have in mind for this link? IDI is not documented in the 
video-interfaces.txt binding.

Since the MIPI CSI-2 DPHY is actually between camera sensor and 
csi2host, after this we can use either IDI or IPI if my understanding is 
correct, and connect to a different pad/hw block which can further 
handle these packets/pixels.

I am interested on how to specify the connection type between this 
output pad and the next one (until a /dev/video can be registered by the 
last driver for the last hw block).

Thanks,

Eugen

> +			};
> +		};
> +	};
> --
> 2.7.4
> 
>