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[PATCH v1 2/8] dt-bindings: display: add dt-bindings for STM32 LVDS device

Raphael Gallais-Pou posted 8 patches 1 year, 12 months ago
Only 3 patches received!
There is a newer version of this series
[PATCH v1 2/8] dt-bindings: display: add dt-bindings for STM32 LVDS device
Posted by Raphael Gallais-Pou 1 year, 12 months ago 
Add dt-binding file for "st,stm32-lvds" compatible.

Signed-off-by: Raphael Gallais-Pou <raphael.gallais-pou@foss.st.com>
---
 .../bindings/display/st,stm32-lvds.yaml       | 114 ++++++++++++++++++
 1 file changed, 114 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/display/st,stm32-lvds.yaml

diff --git a/Documentation/devicetree/bindings/display/st,stm32-lvds.yaml b/Documentation/devicetree/bindings/display/st,stm32-lvds.yaml
new file mode 100644
index 000000000000..d72c9088133c
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/st,stm32-lvds.yaml
@@ -0,0 +1,114 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/st,stm32-lvds.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: STMicroelectronics STM32 LVDS Display Interface Transmitter
+
+maintainers:
+  - Raphael Gallais-Pou <raphael.gallais-pou@foss.st.com>
+  - Yannick Fertre <yannick.fertre@foss.st.com>
+
+description: |
+  The STMicroelectronics STM32 LVDS Display Interface Transmitter handles the
+  LVDS protocol: it maps the pixels received from the upstream Pixel-DMA (LTDC)
+  onto the LVDS PHY.
+
+  It regroups three sub blocks:
+    - LVDS host: handles the LVDS protocol (FPD / OpenLDI) and maps its input
+      pixels onto the data lanes of the PHY
+    - LVDS PHY: parallelize the data and drives the LVDS data lanes
+    - LVDS wrapper: handles top-level settings
+
+  The LVDS controller driver supports the following high-level features:
+    - FDP-Link-I and OpenLDI (v0.95) protocols
+    - Single-Link or Dual-Link operation
+    - Single-Display or Double-Display (with the same content duplicated on both)
+    - Flexible Bit-Mapping, including JEIDA and VESA
+    - RGB888 or RGB666 output
+    - Synchronous design, with one input pixel per clock cycle
+
+properties:
+  "#clock-cells":
+    const: 0
+
+  compatible:
+    const: st,stm32-lvds
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    items:
+      - description: APB peripheral clock
+      - description: Reference clock for the internal PLL
+
+  clock-names:
+    items:
+      - const: pclk
+      - const: ref
+
+  resets:
+    maxItems: 1
+
+  ports:
+    $ref: /schemas/graph.yaml#/properties/ports
+
+    properties:
+      port@0:
+        $ref: /schemas/graph.yaml#/properties/port
+        description: |
+          LVDS input port node, connected to the LTDC RGB output port.
+
+      port@1:
+        $ref: /schemas/graph.yaml#/properties/port
+        description: |
+          LVDS output port node, connected to a panel or bridge input port.
+
+required:
+  - "#clock-cells"
+  - compatible
+  - reg
+  - clocks
+  - clock-names
+  - resets
+  - ports
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/bus/stm32mp25_sys_bus.h>
+    #include <dt-bindings/clock/stm32mp25-clks.h>
+    #include <dt-bindings/reset/stm32mp25-resets.h>
+
+    lvds: lvds@48060000 {
+        #clock-cells = <0>;
+        compatible = "st,stm32-lvds";
+        reg = <0x48060000 0x2000>;
+        clocks = <&rcc CK_BUS_LVDS>, <&rcc CK_KER_LVDSPHY>;
+        clock-names = "pclk", "ref";
+        resets = <&rcc LVDS_R>;
+
+        ports {
+            #address-cells = <1>;
+            #size-cells = <0>;
+
+            port@0 {
+                reg = <0>;
+                lvds_in: endpoint {
+                   remote-endpoint = <&ltdc_ep1_out>;
+                };
+            };
+
+            port@1 {
+                reg = <1>;
+                lvds_out0: endpoint {
+                   remote-endpoint = <&lvds_panel_in>;
+                };
+            };
+        };
+    };
+
+...
-- 
2.25.1
Re: [PATCH v1 2/8] dt-bindings: display: add dt-bindings for STM32 LVDS device
Posted by Krzysztof Kozlowski 1 year, 12 months ago 
On 21/12/2023 13:28, Raphael Gallais-Pou wrote:
> Add dt-binding file for "st,stm32-lvds" compatible.
> 

A nit, subject: drop second/last, redundant "dt-bindings for". The
"dt-bindings" prefix is already stating that these are bindings.

> Signed-off-by: Raphael Gallais-Pou <raphael.gallais-pou@foss.st.com>
> ---
>  .../bindings/display/st,stm32-lvds.yaml       | 114 ++++++++++++++++++
>  1 file changed, 114 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/display/st,stm32-lvds.yaml
> 

...

> +properties:
> +  "#clock-cells":
> +    const: 0
> +
> +  compatible:
> +    const: st,stm32-lvds

Please put compatible as first.

> +
> +  reg:
> +    maxItems: 1
> +
> +  clocks:
> +    items:
> +      - description: APB peripheral clock
> +      - description: Reference clock for the internal PLL
> +
> +  clock-names:
> +    items:
> +      - const: pclk
> +      - const: ref
> +
> +  resets:
> +    maxItems: 1
> +
> +  ports:
> +    $ref: /schemas/graph.yaml#/properties/ports
> +
> +    properties:
> +      port@0:
> +        $ref: /schemas/graph.yaml#/properties/port
> +        description: |
> +          LVDS input port node, connected to the LTDC RGB output port.
> +
> +      port@1:
> +        $ref: /schemas/graph.yaml#/properties/port
> +        description: |
> +          LVDS output port node, connected to a panel or bridge input port.

Ports are not required? I would assume it won't work without input and
output.

> +
> +required:
> +  - "#clock-cells"
> +  - compatible
> +  - reg
> +  - clocks
> +  - clock-names
> +  - resets
> +  - ports
> +
> +unevaluatedProperties: false

additionalProperties instead... or did I miss some $ref anywhere?

> +
> +examples:
> +  - |
> +    #include <dt-bindings/bus/stm32mp25_sys_bus.h>
> +    #include <dt-bindings/clock/stm32mp25-clks.h>
> +    #include <dt-bindings/reset/stm32mp25-resets.h>
> +
> +    lvds: lvds@48060000 {
> +        #clock-cells = <0>;
> +        compatible = "st,stm32-lvds";

compatible is always the first property.

> +        reg = <0x48060000 0x2000>;

put clock-cells here

> +        clocks = <&rcc CK_BUS_LVDS>, <&rcc CK_KER_LVDSPHY>;
> +        clock-names = "pclk", "ref";
> +        resets = <&rcc LVDS_R>;

Best regards,
Krzysztof
Re: [PATCH v1 2/8] dt-bindings: display: add dt-bindings for STM32 LVDS device
Posted by Raphael Gallais-Pou 1 year, 12 months ago 
Hi Krzysztof,


Thanks for your review. I wall send another serie later with those modifications.


Best regards,

Raphaël


On 12/21/23 18:27, Krzysztof Kozlowski wrote:
> On 21/12/2023 13:28, Raphael Gallais-Pou wrote:
>> Add dt-binding file for "st,stm32-lvds" compatible.
>>
> A nit, subject: drop second/last, redundant "dt-bindings for". The
> "dt-bindings" prefix is already stating that these are bindings.
>
>> Signed-off-by: Raphael Gallais-Pou <raphael.gallais-pou@foss.st.com>
>> ---
>>  .../bindings/display/st,stm32-lvds.yaml       | 114 ++++++++++++++++++
>>  1 file changed, 114 insertions(+)
>>  create mode 100644 Documentation/devicetree/bindings/display/st,stm32-lvds.yaml
>>
> ...
>
>> +properties:
>> +  "#clock-cells":
>> +    const: 0
>> +
>> +  compatible:
>> +    const: st,stm32-lvds
> Please put compatible as first.
>
>> +
>> +  reg:
>> +    maxItems: 1
>> +
>> +  clocks:
>> +    items:
>> +      - description: APB peripheral clock
>> +      - description: Reference clock for the internal PLL
>> +
>> +  clock-names:
>> +    items:
>> +      - const: pclk
>> +      - const: ref
>> +
>> +  resets:
>> +    maxItems: 1
>> +
>> +  ports:
>> +    $ref: /schemas/graph.yaml#/properties/ports
>> +
>> +    properties:
>> +      port@0:
>> +        $ref: /schemas/graph.yaml#/properties/port
>> +        description: |
>> +          LVDS input port node, connected to the LTDC RGB output port.
>> +
>> +      port@1:
>> +        $ref: /schemas/graph.yaml#/properties/port
>> +        description: |
>> +          LVDS output port node, connected to a panel or bridge input port.
> Ports are not required? I would assume it won't work without input and
> output.
>
>> +
>> +required:
>> +  - "#clock-cells"
>> +  - compatible
>> +  - reg
>> +  - clocks
>> +  - clock-names
>> +  - resets
>> +  - ports
>> +
>> +unevaluatedProperties: false
> additionalProperties instead... or did I miss some $ref anywhere?
>
>> +
>> +examples:
>> +  - |
>> +    #include <dt-bindings/bus/stm32mp25_sys_bus.h>
>> +    #include <dt-bindings/clock/stm32mp25-clks.h>
>> +    #include <dt-bindings/reset/stm32mp25-resets.h>
>> +
>> +    lvds: lvds@48060000 {
>> +        #clock-cells = <0>;
>> +        compatible = "st,stm32-lvds";
> compatible is always the first property.
>
>> +        reg = <0x48060000 0x2000>;
> put clock-cells here
>
>> +        clocks = <&rcc CK_BUS_LVDS>, <&rcc CK_KER_LVDSPHY>;
>> +        clock-names = "pclk", "ref";
>> +        resets = <&rcc LVDS_R>;
> Best regards,
> Krzysztof
>

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