[v2,1/6] dt-bindings: display: Document NewVision NV3052C DT node

Commit Message

Paul Cercueil Aug. 22, 2020, 4:32 p.m. UTC

Add documentation for the Device Tree node for LCD panels based on the
NewVision NV3052C controller.

v2: - Support backlight property
    - Add *-supply properties for the 5 different power supplies.
      Either they must all be present, or 'power-supply' must be
      present.
    - Reword description to avoid confusion about 'driver'
    - Use 4-space indent in example

Signed-off-by: Paul Cercueil <[e-mail]>
---
 .../display/panel/newvision,nv3052c.yaml      | 100 ++++++++++++++++++
 1 file changed, 100 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/display/panel/newvision,nv3052c.yaml

Comments

Rob Herring (Arm) Sept. 8, 2020, 9:50 p.m. UTC | #1

On Sat, 22 Aug 2020 18:32:45 +0200, Paul Cercueil wrote:
> Add documentation for the Device Tree node for LCD panels based on the
> NewVision NV3052C controller.
> 
> v2: - Support backlight property
>     - Add *-supply properties for the 5 different power supplies.
>       Either they must all be present, or 'power-supply' must be
>       present.
>     - Reword description to avoid confusion about 'driver'
>     - Use 4-space indent in example
> 
> Signed-off-by: Paul Cercueil <[e-mail]>
> ---
>  .../display/panel/newvision,nv3052c.yaml      | 100 ++++++++++++++++++
>  1 file changed, 100 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/display/panel/newvision,nv3052c.yaml
> 

Reviewed-by: Rob Herring <[e-mail]>

Linus Walleij Sept. 9, 2020, 11:41 a.m. UTC | #2

On Sat, Aug 22, 2020 at 6:33 PM Paul Cercueil <[e-mail]> wrote:

> Add documentation for the Device Tree node for LCD panels based on the
> NewVision NV3052C controller.
>
> v2: - Support backlight property
>     - Add *-supply properties for the 5 different power supplies.
>       Either they must all be present, or 'power-supply' must be
>       present.
>     - Reword description to avoid confusion about 'driver'
>     - Use 4-space indent in example
>
> Signed-off-by: Paul Cercueil <[e-mail]>

Reviewed-by: Linus Walleij <[e-mail]>

> +            reset-gpios = <&gpe 2 GPIO_ACTIVE_LOW>;

This has the right polarity but the code in patch 6
seems to use a device tree that does not?

Yours,
Linus Walleij

Patch

diff --git a/Documentation/devicetree/bindings/display/panel/newvision,nv3052c.yaml b/Documentation/devicetree/bindings/display/panel/newvision,nv3052c.yaml
new file mode 100644
index 000000000000..0468ddeaff2d
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/panel/newvision,nv3052c.yaml
@@ -0,0 +1,100 @@ 
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/panel/newvision,nv3052c.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: NewVision NV3052C TFT LCD panel driver with SPI control bus
+
+maintainers:
+  - Paul Cercueil <[e-mail]>
+
+description: |
+  This is a IC driver for TFT panels, accepting a variety of input
+  streams that get adapted and scaled to the panel.
+
+  The panel must obey the rules for a SPI slave device as specified in
+  spi/spi-controller.yaml
+
+allOf:
+  - $ref: panel-common.yaml#
+
+properties:
+  compatible:
+    items:
+      - enum:
+        - leadtek,ltk035c5444t-spi
+
+      - const: newvision,nv3052c
+
+  reg:
+    maxItems: 1
+
+  reset-gpios: true
+  power-supply: true
+  backlight: true
+  port: true
+
+  vci-supply:
+    description:
+      Power supply for analog circuits (VCI=2.5V to 6V)
+
+  vddam-supply:
+    description:
+      Power Supply for MIPI regulator circuits (VDDAM=1.75V to 6V)
+
+  iovcc-supply:
+    description: |
+      External Power Supply for IO pads and other logic circuits
+      (IOVCC=1.65 to 3.6V)
+
+  pprech-supply:
+    description:
+      Pre-charge power for source (can be connected to IOVCC or VCI)
+
+  vpp-supply:
+    description:
+      Input power for NV memory programming (8.0V ~ 8.5V, typical=8.25V)
+
+required:
+  - compatible
+  - reg
+
+oneOf:
+  - required:
+    - power-supply
+  - required:
+    - vci-supply
+    - vddam-supply
+    - iovcc-supply
+    - pprech-supply
+    - vpp-supply
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+    spi {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        display@0 {
+            compatible = "leadtek,ltk035c5444t-spi", "newvision,nv3052c";
+            reg = <0>;
+
+            spi-max-frequency = <15000000>;
+            spi-3wire;
+            reset-gpios = <&gpe 2 GPIO_ACTIVE_LOW>;
+            backlight = <&backlight>;
+            power-supply = <&vcc>;
+
+            port {
+                panel_input: endpoint {
+                    remote-endpoint = <&panel_output>;
+                };
+            };
+        };
+    };
+
+...