Re: [PATCH v4 6/8] media: dt-bindings: Add bindings for JH7110 Camera Subsystem

Laurent Pinchart
2023-04-19T06:15:38Z

Hi Jack,

Thank you for the patch.

On Thu, Apr 13, 2023 at 11:55:39AM +0800, Jack Zhu wrote:
> Add the bindings documentation for Starfive JH7110 Camera Subsystem
> which is used for handing image sensor data.
>
> Signed-off-by: Jack Zhu <jack.zhu@starfivetech.com>
> ---
> .../bindings/media/starfive,jh7110-camss.yaml | 164 ++++++++++++++++++
> MAINTAINERS | 7 +
> 2 files changed, 171 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/media/starfive,jh7110-camss.yaml
>
> diff --git a/Documentation/devicetree/bindings/media/starfive,jh7110-camss.yaml b/Documentation/devicetree/bindings/media/starfive,jh7110-camss.yaml
> new file mode 100644
> index 000000000000..4cd144f1b845
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/media/starfive,jh7110-camss.yaml
> @@ -0,0 +1,164 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/media/starfive,jh7110-camss.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Starfive SoC CAMSS ISP
> +
> +maintainers:
> + - Jack Zhu <jack.zhu@starfivetech.com>
> + - Changhuang Liang <changhuang.liang@starfivetech.com>
> +
> +description:
> + The Starfive CAMSS ISP is a Camera interface for Starfive JH7110 SoC. It
> + consists of a VIN controller (Video In Controller, a top-level control until)
> + and an ISP.
> +
> +properties:
> + compatible:
> + const: starfive,jh7110-camss
> +
> + reg:
> + maxItems: 2
> +
> + reg-names:
> + items:
> + - const: syscon
> + - const: isp
> +
> + clocks:
> + maxItems: 7
> +
> + clock-names:
> + items:
> + - const: apb_func
> + - const: wrapper_clk_c
> + - const: dvp_inv
> + - const: axiwr
> + - const: mipi_rx0_pxl
> + - const: ispcore_2x
> + - const: isp_axi
> +
> + resets:
> + maxItems: 6
> +
> + reset-names:
> + items:
> + - const: wrapper_p
> + - const: wrapper_c
> + - const: axird
> + - const: axiwr
> + - const: isp_top_n
> + - const: isp_top_axi
> +
> + power-domains:
> + items:
> + - description: JH7110 ISP Power Domain Switch Controller.
> +
> + interrupts:
> + maxItems: 4
> +
> + ports:
> + $ref: /schemas/graph.yaml#/properties/ports
> +
> + properties:
> + port@0:
> + $ref: /schemas/graph.yaml#/$defs/port-base
> + unevaluatedProperties: false
> + description: Input port for receiving DVP data.
> +
> + properties:
> + endpoint:
> + $ref: video-interfaces.yaml#
> + unevaluatedProperties: false
> +
> + properties:
> + bus-width:
> + const: 8
> +
> + data-shift:
> + const: 2

As far as I can tell, those two properties are not handled by the
driver. I assume this is because the driver doesn't support the DVP
input yet. That's fine, but it makes it a bit hard to review the device
tree. Could you provide some information about the DVP hardware
interface ? Does it support both BT.656 and sync signals, or just sync
signals ? Are the polarities of the clock and h/v sync controllable ?
Is the parallel input bus 8-bit wide or are other options supported ?
And finally, what are you modelling with data-shift: 2 ?

> +
> + port@1:
> + $ref: /schemas/graph.yaml#/properties/port
> + description: Input port for receiving CSI data.
> +
> + required:
> + - port@0
> + - port@1
> +
> +required:
> + - compatible
> + - reg
> + - reg-names
> + - clocks
> + - clock-names
> + - resets
> + - reset-names
> + - power-domains
> + - interrupts
> + - ports
> +
> +additionalProperties: false
> +
> +examples:
> + - |
> + isp@19840000 {
> + compatible = "starfive,jh7110-camss";
> + reg = <0x19840000 0x10000>,
> + <0x19870000 0x30000>;
> + reg-names = "syscon", "isp";
> + clocks = <&ispcrg 0>,
> + <&ispcrg 13>,
> + <&ispcrg 2>,
> + <&ispcrg 12>,
> + <&ispcrg 1>,
> + <&syscrg 51>,
> + <&syscrg 52>;
> + clock-names = "apb_func",
> + "wrapper_clk_c",
> + "dvp_inv",
> + "axiwr",
> + "mipi_rx0_pxl",
> + "ispcore_2x",
> + "isp_axi";
> + resets = <&ispcrg 0>,
> + <&ispcrg 1>,
> + <&ispcrg 10>,
> + <&ispcrg 11>,
> + <&syscrg 41>,
> + <&syscrg 42>;
> + reset-names = "wrapper_p",
> + "wrapper_c",
> + "axird",
> + "axiwr",
> + "isp_top_n",
> + "isp_top_axi";
> + power-domains = <&pwrc 5>;
> + interrupts = <92>, <87>, <88>, <90>;
> +
> + ports {
> + #address-cells = <1>;
> + #size-cells = <0>;
> + port@0 {
> + reg = <0>;
> + vin_from_sc2235: endpoint {
> + remote-endpoint = <&sc2235_to_vin>;
> + bus-width = <8>;
> + data-shift = <2>;
> + hsync-active = <1>;
> + vsync-active = <0>;
> + pclk-sample = <1>;
> + };
> + };
> +
> + port@1 {
> + reg = <1>;
> + vin_from_csi2rx: endpoint {
> + remote-endpoint = <&csi2rx_to_vin>;
> + };
> + };
> + };
> + };
> diff --git a/MAINTAINERS b/MAINTAINERS
> index bbb8b5c0187b..b8c76b0d7eb3 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -19909,6 +19909,13 @@ M: Ion Badulescu <ionut@badula.org>
> S: Odd Fixes
> F: drivers/net/ethernet/adaptec/starfire*
>
> +STARFIVE CAMERA SUBSYSTEM DRIVER
> +M: Jack Zhu <jack.zhu@starfivetech.com>
> +M: Changhuang Liang <changhuang.liang@starfivetech.com>
> +L: linux-media@vger.kernel.org
> +S: Maintained
> +F: Documentation/devicetree/bindings/media/starfive,jh7110-camss.yaml
> +
> STARFIVE DEVICETREES
> M: Emil Renner Berthing <kernel@esmil.dk>
> S: Maintained

--
Regards,

Laurent Pinchart