Re: [PATCH v6 5/8] dt-bindings: display: add i.MX6 MIPI DSI host controller doc

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On Tue, 14 Apr 2020, Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx> wrote:
Hi Adrian, Thank you for the patch.

Hi Laurent,

Thank you for the review - you raised some good points which will be addressed in the next revision (will leave this on review a bit more).

I will also convert the dw_mipi_dsi.txt to yaml as you suggest and send that as a separate patch.

Best wishes,
Adrian


On Tue, Apr 14, 2020 at 06:19:52PM +0300, Adrian Ratiu wrote:
This provides an example DT binding for the MIPI DSI host controller present on the i.MX6 SoC based on Synopsis DesignWare v1.01 IP. Cc: Rob Herring <robh@xxxxxxxxxx> Cc: Neil Armstrong <narmstrong@xxxxxxxxxxxx> Cc: Fabio Estevam <festevam@xxxxxxxxx> Cc: devicetree@xxxxxxxxxxxxxxx Tested-by: Adrian Pop <pop.adrian61@xxxxxxxxx> Tested-by: Arnaud Ferraris <arnaud.ferraris@xxxxxxxxxxxxx> Signed-off-by: Sjoerd Simons <sjoerd.simons@xxxxxxxxxxxxx> Signed-off-by: Martyn Welch <martyn.welch@xxxxxxxxxxxxx> Signed-off-by: Adrian Ratiu <adrian.ratiu@xxxxxxxxxxxxx> --- Changes since v5: - Fixed missing reg warning (Fabio) - Updated dt-schema and fixed warnings (Rob) Changes since v4: - Fixed yaml binding to pass `make dt_binding_check dtbs_check` and addressed received binding feedback (Rob) Changes since v3: - Added commit message (Neil) - Converted to yaml format (Neil) - Minor dt node + driver fixes (Rob) - Added small panel example to the host controller binding Changes since v2: - Fixed commit tags (Emil) --- .../display/imx/fsl,mipi-dsi-imx6.yaml | 139 ++++++++++++++++++ 1 file changed, 139 insertions(+) create mode 100644 Documentation/devicetree/bindings/display/imx/fsl,mipi-dsi-imx6.yaml diff --git a/Documentation/devicetree/bindings/display/imx/fsl,mipi-dsi-imx6.yaml b/Documentation/devicetree/bindings/display/imx/fsl,mipi-dsi-imx6.yaml new file mode 100644 index 000000000000..10e289ea219a --- /dev/null +++ b/Documentation/devicetree/bindings/display/imx/fsl,mipi-dsi-imx6.yaml @@ -0,0 +1,139 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/display/imx/fsl,mipi-dsi-imx6.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Freescale i.MX6 DW MIPI DSI Host Controller + +maintainers: + - Adrian Ratiu <adrian.ratiu@xxxxxxxxxxxxx> + +description: | + The i.MX6 DSI host controller is a Synopsys DesignWare MIPI DSI v1.01 + IP block with a companion PHY IP. + + These DT bindings follow the Synopsys DW MIPI DSI bindings defined in + Documentation/devicetree/bindings/display/bridge/dw_mipi_dsi.txt with + the following device-specific properties.

Not necessarily a prerequisite for this patch, but it would be nice to get that converted to yaml, and included here with allOf: $ref: ../bridge/snps,dw-mipi-dsi.yaml# (assuming that's how the file will be called).

Yes, I will do this conversion but in a separate patch to avoid making this series bigger.

Thanks,
Adrian

+
+properties:
+  compatible:
+    items:
+      - const: fsl,imx6q-mipi-dsi
+      - const: snps,dw-mipi-dsi
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  clocks:
+    items:
+      - description: Module Clock
+      - description: DSI bus clock
+
+  clock-names:
+    items:
+      - const: ref
+      - const: pclk
+
+  fsl,gpr:
+    description: Phandle to the iomuxc-gpr region containing the multiplexer control register.

Could you please wrap liens at a 80 columns boundary ?

+    $ref: /schemas/types.yaml#/definitions/phandle
+
+  ports:
+    type: object
+    description: |
+      A node containing DSI input & output port nodes with endpoint
+      definitions as documented in
+      Documentation/devicetree/bindings/media/video-interfaces.txt
+      Documentation/devicetree/bindings/graph.txt
+    properties:

You should add

       '#address-cells':
         const: 1

       '#size-cells':
         const: 0

+      port@0:
+        type: object
+        description:
+          DSI input port node, connected to the ltdc rgb output port.
+
+      port@1:
+        type: object
+        description:
+          DSI output port node, connected to a panel or a bridge input port"


Should this be "RGB output port node" ? And s/"/./

And here you should add

       additionalProperties: false

+
+patternProperties:
+  "^panel@[0-3]$":
+    type: object
+    description: |
+      A node containing the panel or bridge description as documented in
+      Documentation/devicetree/bindings/display/mipi-dsi-bus.txt
+    properties:
+      port:
+        type: object
+        description:
+          Panel or bridge port node, connected to the DSI output port (port@1)

Does this belong here ? I think the port property for the panel needs to
be described in the panel's binding instead.

+
+  "#address-cells":
+    const: 1
+
+  "#size-cells":
+    const: 0

These two properties are not pattern properties, right ? Should they be
listed under the properties above ?

+
+required:
+  - "#address-cells"
+  - "#size-cells"
+  - compatible
+  - reg
+  - interrupts
+  - clocks
+  - clock-names
+  - ports
+
+additionalProperties: false
+
+examples:
+  - |+
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    #include <dt-bindings/clock/imx6qdl-clock.h>
+    #include <dt-bindings/gpio/gpio.h>

Alphabetical order ?

+
+    dsi: dsi@21e0000 {
+        #address-cells = <1>;
+        #size-cells = <0>;
+        compatible = "fsl,imx6q-mipi-dsi", "snps,dw-mipi-dsi";
+        reg = <0x021e0000 0x4000>;
+        interrupts = <0 102 IRQ_TYPE_LEVEL_HIGH>;
+        fsl,gpr = <&gpr>;
+        clocks = <&clks IMX6QDL_CLK_MIPI_CORE_CFG>,
+                 <&clks IMX6QDL_CLK_MIPI_IPG>;
+        clock-names = "ref", "pclk";
+
+        ports {
+            #address-cells = <1>;
+            #size-cells = <0>;
+            port@1 {
+                reg = <1>;
+                dsi_out: endpoint {
+                    remote-endpoint = <&panel_in>;
+                };
+            };
+        };
+
+        panel@0 {
+            compatible = "sharp,ls032b3sx01";
+            reg = <0>;
+            reset-gpios = <&gpio6 8 GPIO_ACTIVE_LOW>;
+            ports {
+                #address-cells = <1>;
+                #size-cells = <0>;
+                port@0 {
+                    reg = <0>;
+                    panel_in: endpoint {
+                        remote-endpoint = <&dsi_out>;
+                    };
+                };
+            };
+        };
+    };
+
+...

--
Regards,

Laurent Pinchart
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