diff mbox series

[v5,2/4] dt-bindings: media: add Maxim MAX96714 GMSL2 Deserializer

Message ID 20240313094922.311743-3-julien.massot@collabora.com (mailing list archive)
State New, archived
Headers show
Series Add support for MAX96714/F and MAX96717/F GMSL2 ser/des | expand

Commit Message

Julien Massot March 13, 2024, 9:49 a.m. UTC
Add DT bindings for Maxim MAX96714 GMSL2 Deserializer.

Signed-off-by: Julien Massot <julien.massot@collabora.com>
---
Change since v4:
 - Add compatible for MAX96714 and use it as a fallback for MAX96714F
 - Remove extra '|' for decriptions
 - Reference 'i2c-gate' instead of 'i2c-controller'

Change since v3:
 - Renamed file to maxim,max96714.yaml dropped the 'f' suffix
 - Removed mention to C-PHY since it's not supported by MAX96714 deserializers
 - Removed bus-type requirement on CSI endpoint since the device only support D-PHY
 - Removed the clock-lanes property in the dt example

Change since v2:
 - remove reg description
 - rename enable gpio to powerdown
 - use generic node name: i2c, serializer, deserializer
---
 .../bindings/media/i2c/maxim,max96714.yaml    | 176 ++++++++++++++++++
 1 file changed, 176 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/media/i2c/maxim,max96714.yaml

Comments

Conor Dooley March 17, 2024, 3:18 p.m. UTC | #1
On Wed, Mar 13, 2024 at 10:49:20AM +0100, Julien Massot wrote:
> Add DT bindings for Maxim MAX96714 GMSL2 Deserializer.
> 
> Signed-off-by: Julien Massot <julien.massot@collabora.com>
> ---
> Change since v4:
>  - Add compatible for MAX96714 and use it as a fallback for MAX96714F
>  - Remove extra '|' for decriptions
>  - Reference 'i2c-gate' instead of 'i2c-controller'
> 
> Change since v3:
>  - Renamed file to maxim,max96714.yaml dropped the 'f' suffix
>  - Removed mention to C-PHY since it's not supported by MAX96714 deserializers
>  - Removed bus-type requirement on CSI endpoint since the device only support D-PHY
>  - Removed the clock-lanes property in the dt example
> 
> Change since v2:
>  - remove reg description
>  - rename enable gpio to powerdown
>  - use generic node name: i2c, serializer, deserializer
> ---
>  .../bindings/media/i2c/maxim,max96714.yaml    | 176 ++++++++++++++++++
>  1 file changed, 176 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/media/i2c/maxim,max96714.yaml
> 
> diff --git a/Documentation/devicetree/bindings/media/i2c/maxim,max96714.yaml b/Documentation/devicetree/bindings/media/i2c/maxim,max96714.yaml
> new file mode 100644
> index 000000000000..59b116092834
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/media/i2c/maxim,max96714.yaml
> @@ -0,0 +1,176 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +# Copyright (C) 2024 Collabora Ltd.
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/media/i2c/maxim,max96714.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Maxim MAX96714 GMSL2 to CSI-2 Deserializer
> +
> +maintainers:
> +  - Julien Massot <julien.massot@collabora.com>
> +
> +description:
> +  The MAX96714 deserializer converts GMSL2 serial inputs into MIPI
> +  CSI-2 D-PHY formatted output. The device allows the GMSL2 link to
> +  simultaneously transmit bidirectional control-channel data while forward
> +  video transmissions are in progress. The MAX96714 can connect to one
> +  remotely located serializer using industry-standard coax or STP
> +  interconnects. The device cans operate in pixel or tunnel mode. In pixel mode
> +  the MAX96714 can select individual video stream, while the tunnel mode forward all
> +  the MIPI data received by the serializer.
> +
> +  The GMSL2 serial link operates at a fixed rate of 3Gbps or 6Gbps in the
> +  forward direction and 187.5Mbps in the reverse direction.
> +  MAX96714F only supports a fixed rate of 3Gbps in the forward direction.
> +
> +properties:
> +  compatible:
> +    oneOf:
> +      - enum:
> +          - maxim,max96714

There's only once device here, make it const rather than enum.

> +      - items:
> +          - enum:
> +              - maxim,max96714f
> +          - const: maxim,max96714 # fallback for 'f' variant

Drop the comment btw, it doesn't make sense given you have an enum that
will allow for more devices and it being a fallback is obvious. That
said, given what you told me on the last version
| Yes there are a few differences visible to the software, for example the 
| GMSL
| link rate since MAX96714 support 6 and 3 Gbps, while MAX96714F only 
| supports 3Gbps.
| the registers map is the same, but a few values are not possible with 
| the 'f' version.
I don't think your ordering here is correct. The 96714 should fall back
to the 96714f, not the opposite that you have here, as the f is the
version which supports fewer features.

I think this should be:

oneOf:
  - const: maxim,max96714f
  - items:
      - enum:
          - maxim,max96714
      - const: maxim,max96714f

Cheers,
Conor.

> +
> +  reg:
> +    maxItems: 1
> +
> +  powerdown-gpios:
> +    maxItems: 1
> +    description:
> +      Specifier for the GPIO connected to the PWDNB pin.
> +
> +  ports:
> +    $ref: /schemas/graph.yaml#/properties/ports
> +
> +    properties:
> +      port@0:
> +        $ref: /schemas/graph.yaml#/properties/port
> +        unevaluatedProperties: false
> +        description: GMSL Input
> +        properties:
> +          endpoint:
> +            $ref: /schemas/media/video-interfaces.yaml#
> +            unevaluatedProperties: false
> +            description:
> +              Endpoint for GMSL2-Link port.
> +
> +      port@1:
> +        $ref: /schemas/graph.yaml#/$defs/port-base
> +        unevaluatedProperties: false
> +        description: CSI-2 Output port
> +
> +        properties:
> +          endpoint:
> +            $ref: /schemas/media/video-interfaces.yaml#
> +            unevaluatedProperties: false
> +
> +            properties:
> +              data-lanes:
> +                minItems: 1
> +                maxItems: 4
> +
> +              lane-polarities:
> +                minItems: 1
> +                maxItems: 5
> +
> +              link-frequencies:
> +                maxItems: 1
> +
> +            required:
> +              - data-lanes
> +
> +    required:
> +      - port@1
> +
> +  i2c-gate:
> +    $ref: /schemas/i2c/i2c-gate.yaml
> +    unevaluatedProperties: false
> +    description:
> +      The MAX96714 will pass through and forward the I2C requests from the
> +      incoming I2C bus over the GMSL2 link. Therefore it supports an i2c-gate
> +      subnode to configure a serializer.
> +
> +  port0-poc-supply:
> +    description: Regulator providing Power over Coax for the GMSL port
> +
> +required:
> +  - compatible
> +  - reg
> +  - ports
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/gpio/gpio.h>
> +    #include <dt-bindings/media/video-interfaces.h>
> +
> +    i2c {
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        deserializer@28 {
> +            compatible = "maxim,max96714f", "maxim,max96714";
> +            reg = <0x28>;
> +            powerdown-gpios = <&main_gpio0 37 GPIO_ACTIVE_LOW>;
> +
> +            ports {
> +                #address-cells = <1>;
> +                #size-cells = <0>;
> +                port@0 {
> +                    reg = <0>;
> +                    max96714_gmsl_in: endpoint {
> +                        remote-endpoint = <&max96917f_gmsl_out>;
> +                    };
> +                };
> +
> +                port@1 {
> +                    reg = <1>;
> +                    max96714_csi_out: endpoint {
> +                        data-lanes = <1 2 3 4>;
> +                        link-frequencies = /bits/ 64 <400000000>;
> +                        remote-endpoint = <&csi_in>;
> +                    };
> +                };
> +            };
> +
> +            i2c-gate {
> +                #address-cells = <1>;
> +                #size-cells = <0>;
> +
> +                serializer@40 {
> +                    compatible = "maxim,max96717f", "maxim,max96717";
> +                    reg = <0x40>;
> +                    gpio-controller;
> +                    #gpio-cells = <2>;
> +                    #clock-cells = <0>;
> +
> +                    ports {
> +                        #address-cells = <1>;
> +                        #size-cells = <0>;
> +
> +                        port@0 {
> +                            reg = <0>;
> +                            max96717f_csi_in: endpoint {
> +                                bus-type = <MEDIA_BUS_TYPE_CSI2_DPHY>;
> +                                data-lanes = <1 2>;
> +                                lane-polarities = <1 0 1>;
> +                                remote-endpoint = <&sensor_out>;
> +                            };
> +                        };
> +
> +                        port@1 {
> +                            reg = <1>;
> +                            max96917f_gmsl_out: endpoint {
> +                                remote-endpoint = <&max96714_gmsl_in>;
> +                            };
> +                        };
> +                    };
> +                };
> +            };
> +        };
> +    };
> +...
> -- 
> 2.44.0
>
Julien Massot March 25, 2024, 1:22 p.m. UTC | #2
Hi Conor,

Thanks for your review.
On 3/17/24 16:18, Conor Dooley wrote:
> On Wed, Mar 13, 2024 at 10:49:20AM +0100, Julien Massot wrote:
>> Add DT bindings for Maxim MAX96714 GMSL2 Deserializer.
>>
>> Signed-off-by: Julien Massot <julien.massot@collabora.com>
>> ---
>> Change since v4:
>>   - Add compatible for MAX96714 and use it as a fallback for MAX96714F
>>   - Remove extra '|' for decriptions
>>   - Reference 'i2c-gate' instead of 'i2c-controller'
>>
>> Change since v3:
>>   - Renamed file to maxim,max96714.yaml dropped the 'f' suffix
>>   - Removed mention to C-PHY since it's not supported by MAX96714 deserializers
>>   - Removed bus-type requirement on CSI endpoint since the device only support D-PHY
>>   - Removed the clock-lanes property in the dt example
>>
>> Change since v2:
>>   - remove reg description
>>   - rename enable gpio to powerdown
>>   - use generic node name: i2c, serializer, deserializer
>> ---
>>   .../bindings/media/i2c/maxim,max96714.yaml    | 176 ++++++++++++++++++
>>   1 file changed, 176 insertions(+)
>>   create mode 100644 Documentation/devicetree/bindings/media/i2c/maxim,max96714.yaml
>>
>> diff --git a/Documentation/devicetree/bindings/media/i2c/maxim,max96714.yaml b/Documentation/devicetree/bindings/media/i2c/maxim,max96714.yaml
>> new file mode 100644
>> index 000000000000..59b116092834
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/media/i2c/maxim,max96714.yaml
>> @@ -0,0 +1,176 @@
>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>> +# Copyright (C) 2024 Collabora Ltd.
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/media/i2c/maxim,max96714.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: Maxim MAX96714 GMSL2 to CSI-2 Deserializer
>> +
>> +maintainers:
>> +  - Julien Massot <julien.massot@collabora.com>
>> +
>> +description:
>> +  The MAX96714 deserializer converts GMSL2 serial inputs into MIPI
>> +  CSI-2 D-PHY formatted output. The device allows the GMSL2 link to
>> +  simultaneously transmit bidirectional control-channel data while forward
>> +  video transmissions are in progress. The MAX96714 can connect to one
>> +  remotely located serializer using industry-standard coax or STP
>> +  interconnects. The device cans operate in pixel or tunnel mode. In pixel mode
>> +  the MAX96714 can select individual video stream, while the tunnel mode forward all
>> +  the MIPI data received by the serializer.
>> +
>> +  The GMSL2 serial link operates at a fixed rate of 3Gbps or 6Gbps in the
>> +  forward direction and 187.5Mbps in the reverse direction.
>> +  MAX96714F only supports a fixed rate of 3Gbps in the forward direction.
>> +
>> +properties:
>> +  compatible:
>> +    oneOf:
>> +      - enum:
>> +          - maxim,max96714
> 
> There's only once device here, make it const rather than enum.

Okay fixed in v6

> 
>> +      - items:
>> +          - enum:
>> +              - maxim,max96714f
>> +          - const: maxim,max96714 # fallback for 'f' variant
> 
> Drop the comment btw, it doesn't make sense given you have an enum that
> will allow for more devices and it being a fallback is obvious. That
> said, given what you told me on the last version
> | Yes there are a few differences visible to the software, for example the
> | GMSL
> | link rate since MAX96714 support 6 and 3 Gbps, while MAX96714F only
> | supports 3Gbps.
> | the registers map is the same, but a few values are not possible with
> | the 'f' version.
> I don't think your ordering here is correct. The 96714 should fall back
> to the 96714f, not the opposite that you have here, as the f is the
> version which supports fewer features.
> 
> I think this should be:
> 
> oneOf:
>    - const: maxim,max96714f
>    - items:
>        - enum:
>            - maxim,max96714
>        - const: maxim,max96714f

I just sent a v6 version with your suggestion. Indeed it makes more sense
to use max96714/7f as a fallback for the non f variant.

Best regards,
Julien
diff mbox series

Patch

diff --git a/Documentation/devicetree/bindings/media/i2c/maxim,max96714.yaml b/Documentation/devicetree/bindings/media/i2c/maxim,max96714.yaml
new file mode 100644
index 000000000000..59b116092834
--- /dev/null
+++ b/Documentation/devicetree/bindings/media/i2c/maxim,max96714.yaml
@@ -0,0 +1,176 @@ 
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+# Copyright (C) 2024 Collabora Ltd.
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/media/i2c/maxim,max96714.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Maxim MAX96714 GMSL2 to CSI-2 Deserializer
+
+maintainers:
+  - Julien Massot <julien.massot@collabora.com>
+
+description:
+  The MAX96714 deserializer converts GMSL2 serial inputs into MIPI
+  CSI-2 D-PHY formatted output. The device allows the GMSL2 link to
+  simultaneously transmit bidirectional control-channel data while forward
+  video transmissions are in progress. The MAX96714 can connect to one
+  remotely located serializer using industry-standard coax or STP
+  interconnects. The device cans operate in pixel or tunnel mode. In pixel mode
+  the MAX96714 can select individual video stream, while the tunnel mode forward all
+  the MIPI data received by the serializer.
+
+  The GMSL2 serial link operates at a fixed rate of 3Gbps or 6Gbps in the
+  forward direction and 187.5Mbps in the reverse direction.
+  MAX96714F only supports a fixed rate of 3Gbps in the forward direction.
+
+properties:
+  compatible:
+    oneOf:
+      - enum:
+          - maxim,max96714
+      - items:
+          - enum:
+              - maxim,max96714f
+          - const: maxim,max96714 # fallback for 'f' variant
+
+  reg:
+    maxItems: 1
+
+  powerdown-gpios:
+    maxItems: 1
+    description:
+      Specifier for the GPIO connected to the PWDNB pin.
+
+  ports:
+    $ref: /schemas/graph.yaml#/properties/ports
+
+    properties:
+      port@0:
+        $ref: /schemas/graph.yaml#/properties/port
+        unevaluatedProperties: false
+        description: GMSL Input
+        properties:
+          endpoint:
+            $ref: /schemas/media/video-interfaces.yaml#
+            unevaluatedProperties: false
+            description:
+              Endpoint for GMSL2-Link port.
+
+      port@1:
+        $ref: /schemas/graph.yaml#/$defs/port-base
+        unevaluatedProperties: false
+        description: CSI-2 Output port
+
+        properties:
+          endpoint:
+            $ref: /schemas/media/video-interfaces.yaml#
+            unevaluatedProperties: false
+
+            properties:
+              data-lanes:
+                minItems: 1
+                maxItems: 4
+
+              lane-polarities:
+                minItems: 1
+                maxItems: 5
+
+              link-frequencies:
+                maxItems: 1
+
+            required:
+              - data-lanes
+
+    required:
+      - port@1
+
+  i2c-gate:
+    $ref: /schemas/i2c/i2c-gate.yaml
+    unevaluatedProperties: false
+    description:
+      The MAX96714 will pass through and forward the I2C requests from the
+      incoming I2C bus over the GMSL2 link. Therefore it supports an i2c-gate
+      subnode to configure a serializer.
+
+  port0-poc-supply:
+    description: Regulator providing Power over Coax for the GMSL port
+
+required:
+  - compatible
+  - reg
+  - ports
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+    #include <dt-bindings/media/video-interfaces.h>
+
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        deserializer@28 {
+            compatible = "maxim,max96714f", "maxim,max96714";
+            reg = <0x28>;
+            powerdown-gpios = <&main_gpio0 37 GPIO_ACTIVE_LOW>;
+
+            ports {
+                #address-cells = <1>;
+                #size-cells = <0>;
+                port@0 {
+                    reg = <0>;
+                    max96714_gmsl_in: endpoint {
+                        remote-endpoint = <&max96917f_gmsl_out>;
+                    };
+                };
+
+                port@1 {
+                    reg = <1>;
+                    max96714_csi_out: endpoint {
+                        data-lanes = <1 2 3 4>;
+                        link-frequencies = /bits/ 64 <400000000>;
+                        remote-endpoint = <&csi_in>;
+                    };
+                };
+            };
+
+            i2c-gate {
+                #address-cells = <1>;
+                #size-cells = <0>;
+
+                serializer@40 {
+                    compatible = "maxim,max96717f", "maxim,max96717";
+                    reg = <0x40>;
+                    gpio-controller;
+                    #gpio-cells = <2>;
+                    #clock-cells = <0>;
+
+                    ports {
+                        #address-cells = <1>;
+                        #size-cells = <0>;
+
+                        port@0 {
+                            reg = <0>;
+                            max96717f_csi_in: endpoint {
+                                bus-type = <MEDIA_BUS_TYPE_CSI2_DPHY>;
+                                data-lanes = <1 2>;
+                                lane-polarities = <1 0 1>;
+                                remote-endpoint = <&sensor_out>;
+                            };
+                        };
+
+                        port@1 {
+                            reg = <1>;
+                            max96917f_gmsl_out: endpoint {
+                                remote-endpoint = <&max96714_gmsl_in>;
+                            };
+                        };
+                    };
+                };
+            };
+        };
+    };
+...