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

Jack Zhu
2023-04-20T08:54:17Z

On 2023/4/19 14:15, Laurent Pinchart wrote:
> 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 ?
>

Hello Laurent,

The DVP hardware supports BT.656 and sync signals, can control the
polarities of h/v sync, supports 8/10/12 bit wide, and data-shift: 2 is
line 9-2.

Jack

>> +
>> + 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
>