On Fri, 14 Oct 2022 18:08, Krzysztof Kozlowski
[off-list ref] wrote:

On 14/10/2022 11:15, Guillaume Ranquet wrote:

quoted

Add mt8195 SoC bindings for hdmi and hdmi-ddc

Signed-off-by: Guillaume Ranquet <redacted>
---
 .../bindings/display/mediatek/mediatek,hdmi.yaml   | 67 +++++++++++++++++-----
 .../display/mediatek/mediatek,mt8195-hdmi-ddc.yaml | 51 ++++++++++++++++
 2 files changed, 104 insertions(+), 14 deletions(-)

diff --git a/Documentation/devicetree/bindings/display/mediatek/mediatek,hdmi.yaml b/Documentation/devicetree/bindings/display/mediatek/mediatek,hdmi.yaml
index bdaf0b51e68c..955026cd7ca5 100644
--- a/Documentation/devicetree/bindings/display/mediatek/mediatek,hdmi.yaml
+++ b/Documentation/devicetree/bindings/display/mediatek/mediatek,hdmi.yaml

@@ -21,26 +21,21 @@ properties:
       - mediatek,mt7623-hdmi
       - mediatek,mt8167-hdmi
       - mediatek,mt8173-hdmi
+      - mediatek,mt8195-hdmi

   reg:
     maxItems: 1

-  interrupts:
-    maxItems: 1
-

This change is not really explained in commit msg...

quoted

   clocks:
-    items:
-      - description: Pixel Clock
-      - description: HDMI PLL
-      - description: Bit Clock
-      - description: S/PDIF Clock
+    minItems: 4
+    maxItems: 4

   clock-names:
-    items:
-      - const: pixel
-      - const: pll
-      - const: bclk
-      - const: spdif
+    minItems: 4
+    maxItems: 4
+
+  interrupts:
+    maxItems: 1

   phys:
     maxItems: 1

@@ -58,6 +53,9 @@ properties:
     description: |
       phandle link and register offset to the system configuration registers.

+  power-domains:
+    maxItems: 1
+
   ports:
     $ref: /schemas/graph.yaml#/properties/ports

@@ -86,9 +84,50 @@ required:
   - clock-names
   - phys
   - phy-names
-  - mediatek,syscon-hdmi
   - ports

+allOf:
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: mediatek,mt8195-hdmi
+    then:
+      properties:
+        clocks:
+          items:
+            - description: APB
+            - description: HDCP
+            - description: HDCP 24M
+            - description: Split HDMI
+        clock-names:
+          items:
+            - const: hdmi_apb_sel
+            - const: hdcp_sel
+            - const: hdcp24_sel
+            - const: split_hdmi
+
+      required:
+        - power-domains
+    else:
+      properties:
+        clocks:
+          items:
+            - description: Pixel Clock
+            - description: HDMI PLL
+            - description: Bit Clock
+            - description: S/PDIF Clock
+
+        clock-names:
+          items:
+            - const: pixel
+            - const: pll
+            - const: bclk
+            - const: spdif
+
+      required:
+        - mediatek,syscon-hdmi
+
 additionalProperties: false

 examples:

diff --git a/Documentation/devicetree/bindings/display/mediatek/mediatek,mt8195-hdmi-ddc.yaml b/Documentation/devicetree/bindings/display/mediatek/mediatek,mt8195-hdmi-ddc.yaml
new file mode 100644
index 000000000000..0fe0a2a2f17f
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/mediatek/mediatek,mt8195-hdmi-ddc.yaml

@@ -0,0 +1,51 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/mediatek/mediatek,mt8195-hdmi-ddc.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Mediatek HDMI DDC for mt8195
+
+maintainers:
+  - CK Hu <ck.hu@mediatek.com>
+  - Jitao shi <jitao.shi@mediatek.com>
+
+description: |
+  The HDMI DDC i2c controller is used to interface with the HDMI DDC pins.
+
+properties:
+  compatible:
+    enum:
+      - mediatek,mt8195-hdmi-ddc

I think I wrote it - you already have bindings for HDMI DDC. I doubt
that these are different and it looks like you model the bindings
according to your driver. That's not the way.

Hi Krzysztof,

I've made a separate binding as this new IP is integrated into the
HDMI hw block.
The difference it makes is that the hw is slightly simpler to describe
as the IP doesn't
have it's own range of registers or an interrupt line.

I can use the "legacy mediatek mtk ddc binding" if I modify it to have
the reg and
interrupt properties not being required for mt8195.

Would that work better for you?

quoted

+
+  clocks:
+    maxItems: 1
+
+  clock-names:
+    items:
+      - const: ddc
+
+  mediatek,hdmi:
+    $ref: /schemas/types.yaml#/definitions/phandle
+    description:
+      A phandle to the mt8195 hdmi controller
+
+required:
+  - compatible
+  - clocks
+  - clock-names
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    #include <dt-bindings/interrupt-controller/irq.h>
+    hdmiddc0: ddc_i2c {

Node names should be generic - ddc.
https://devicetree-specification.readthedocs.io/en/latest/chapter2-devicetree-basics.html#generic-names-recommendation

No underscores in node names.

Additionally I2C devices have addresses on the bus. Why this one doesn't?

This is an i2c adapter, not a device.
And as it lives inside the HDMI hw block, I've omitted using an address here.

Is this valid? or should this be expressed differently?

Thx,
Guillaume.

quoted

+      compatible = "mediatek,mt8195-hdmi-ddc";
+      mediatek,hdmi = <&hdmi0>;
+      clocks = <&clk26m>;
+      clock-names = "ddc";
+    };
+
+...

Best regards,
Krzysztof

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