[PATCH v5 0/2] *** IT6505 driver read dt properties ***

[PATCH v5 0/2] *** IT6505 driver read dt properties ***

[allen]

This series let driver can read properties from dt to restrict dp output
bandwidth.

Changes in v3:
-Rename property name.

Changes in v4:
-Use data-lanes and link-frequencies instead of "ite,dp-output-data-lane-count" and "ite,dp-output-max-pixel-clock-mhz".

Changes in v5:
-Add a port and a endpoint.
-Move data-lanes property to the output endpoint.

allen chen (2):
  dt-bindings: it6505: add properties to restrict output bandwidth
  drm/bridge: add it6505 driver to read data-lanes and link-frequencies
    from dt

 .../bindings/display/bridge/ite,it6505.yaml   | 89 +++++++++++++++++--
 drivers/gpu/drm/bridge/ite-it6505.c           | 80 ++++++++++++++++-
 2 files changed, 160 insertions(+), 9 deletions(-)

-- 
2.25.1

[PATCH v5 1/2] dt-bindings: it6505: add properties to restrict output bandwidth

[allen]

From: allen chen <allen.chen@ite.com.tw>

Add properties to restrict dp output data-lanes and clock.

Signed-off-by: Pin-Yen Lin <treapking@chromium.org>
Signed-off-by: Allen Chen <allen.chen@ite.com.tw>
---
 .../bindings/display/bridge/ite,it6505.yaml   | 89 +++++++++++++++++--
 1 file changed, 83 insertions(+), 6 deletions(-)

diff --git a/Documentation/devicetree/bindings/display/bridge/ite,it6505.yaml b/Documentation/devicetree/bindings/display/bridge/ite,it6505.yaml
index 833d11b2303a7..8e607b6929fc9 100644
--- a/Documentation/devicetree/bindings/display/bridge/ite,it6505.yaml
+++ b/Documentation/devicetree/bindings/display/bridge/ite,it6505.yaml
@@ -52,9 +52,70 @@ properties:
     maxItems: 1
     description: extcon specifier for the Power Delivery
 
-  port:
-    $ref: /schemas/graph.yaml#/properties/port
-    description: A port node pointing to DPI host port node
+  ports:
+    $ref: /schemas/graph.yaml#/properties/ports
+
+    properties:
+      port@0:
+        $ref: /schemas/graph.yaml#/$defs/port-base
+        unevaluatedProperties: false
+        description: A port node pointing to DPI host port node
+
+        properties:
+          endpoint:
+            $ref: /schemas/graph.yaml#/$defs/endpoint-base
+            unevaluatedProperties: false
+
+            properties:
+              link-frequencies:
+                minItems: 1
+                maxItems: 1
+                description: Allowed max link frequencies in Hz
+
+      port@1:
+        $ref: /schemas/graph.yaml#/$defs/port-base
+        unevaluatedProperties: false
+        description: Video port for DP output
+
+        properties:
+          endpoint:
+            $ref: /schemas/graph.yaml#/$defs/endpoint-base
+            unevaluatedProperties: false
+
+            properties:
+              data-lanes:
+                oneOf:
+                  - minItems: 1
+                    maxItems: 1
+                    uniqueItems: true
+                    items:
+                      enum:
+                        - 0
+                        - 1
+                    description: For one lane operation.
+
+                  - minItems: 2
+                    maxItems: 2
+                    uniqueItems: true
+                    items:
+                      enum:
+                        - 0
+                        - 1
+                    description: For two lanes operation.
+
+                  - minItems: 4
+                    maxItems: 4
+                    uniqueItems: true
+                    items:
+                      enum:
+                        - 0
+                        - 1
+                        - 2
+                        - 3
+                    description: For four lanes operation.
+    required:
+      - port@0
+      - port@1
 
 required:
   - compatible
@@ -63,6 +124,7 @@ required:
   - interrupts
   - reset-gpios
   - extcon
+  - ports
 
 additionalProperties: false
 
@@ -85,9 +147,24 @@ examples:
             reset-gpios = <&pio 179 1>;
             extcon = <&usbc_extcon>;
 
-            port {
-                it6505_in: endpoint {
-                    remote-endpoint = <&dpi_out>;
+            ports {
+                #address-cells = <1>;
+                #size-cells = <0>;
+
+                port@0 {
+                    reg = <0>;
+                    it6505_in: endpoint {
+                        remote-endpoint = <&dpi_out>;
+                        link-frequencies = /bits/ 64 <150000000>;
+                    };
+                };
+
+                port@1 {
+                    reg = <1>;
+                    it6505_out: endpoint {
+                        remote-endpoint = <&dp_in>;
+                        data-lanes = <0 1>;
+                    };
                 };
             };
         };
-- 
2.25.1

Re: [PATCH v5 1/2] dt-bindings: it6505: add properties to restrict output bandwidth

[Rob Herring]

On Wed, Oct 19, 2022 at 05:32:13PM +0800, allen wrote:
> From: allen chen <allen.chen@ite.com.tw>
> 
> Add properties to restrict dp output data-lanes and clock.
> 
> Signed-off-by: Pin-Yen Lin <treapking@chromium.org>
> Signed-off-by: Allen Chen <allen.chen@ite.com.tw>
> ---
>  .../bindings/display/bridge/ite,it6505.yaml   | 89 +++++++++++++++++--
>  1 file changed, 83 insertions(+), 6 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/display/bridge/ite,it6505.yaml b/Documentation/devicetree/bindings/display/bridge/ite,it6505.yaml
> index 833d11b2303a7..8e607b6929fc9 100644
> --- a/Documentation/devicetree/bindings/display/bridge/ite,it6505.yaml
> +++ b/Documentation/devicetree/bindings/display/bridge/ite,it6505.yaml
> @@ -52,9 +52,70 @@ properties:
>      maxItems: 1
>      description: extcon specifier for the Power Delivery
>  
> -  port:
> -    $ref: /schemas/graph.yaml#/properties/port
> -    description: A port node pointing to DPI host port node

No existing users you are breaking? The commit msg should explain.

> +  ports:
> +    $ref: /schemas/graph.yaml#/properties/ports
> +
> +    properties:
> +      port@0:
> +        $ref: /schemas/graph.yaml#/$defs/port-base
> +        unevaluatedProperties: false
> +        description: A port node pointing to DPI host port node
> +
> +        properties:
> +          endpoint:
> +            $ref: /schemas/graph.yaml#/$defs/endpoint-base
> +            unevaluatedProperties: false
> +
> +            properties:
> +              link-frequencies:
> +                minItems: 1
> +                maxItems: 1
> +                description: Allowed max link frequencies in Hz
> +
> +      port@1:
> +        $ref: /schemas/graph.yaml#/$defs/port-base
> +        unevaluatedProperties: false
> +        description: Video port for DP output
> +
> +        properties:
> +          endpoint:
> +            $ref: /schemas/graph.yaml#/$defs/endpoint-base
> +            unevaluatedProperties: false
> +
> +            properties:
> +              data-lanes:
> +                oneOf:
> +                  - minItems: 1
> +                    maxItems: 1
> +                    uniqueItems: true
> +                    items:
> +                      enum:
> +                        - 0
> +                        - 1
> +                    description: For one lane operation.
> +
> +                  - minItems: 2
> +                    maxItems: 2
> +                    uniqueItems: true
> +                    items:
> +                      enum:
> +                        - 0
> +                        - 1
> +                    description: For two lanes operation.
> +
> +                  - minItems: 4
> +                    maxItems: 4
> +                    uniqueItems: true
> +                    items:
> +                      enum:
> +                        - 0
> +                        - 1
> +                        - 2
> +                        - 3
> +                    description: For four lanes operation.

I would do just:

data-lanes:
  minItems: 1
  items:
    - enum: [ 0, 1 ]
    - const: 1
    - const: 2
    - const: 3

It does allow 3 lanes, but I don't think that's a big deal. What it does 
doesn't allow is any order and yours does.

Rob

Re: [PATCH v5 1/2] dt-bindings: it6505: add properties to restrict output bandwidth

[Pin-yen Lin]

Hi Allen,

On Tue, Oct 25, 2022 at 12:37 AM Rob Herring <robh@kernel.org> wrote:
>
> On Wed, Oct 19, 2022 at 05:32:13PM +0800, allen wrote:
> > From: allen chen <allen.chen@ite.com.tw>
> >
> > Add properties to restrict dp output data-lanes and clock.
> >
> > Signed-off-by: Pin-Yen Lin <treapking@chromium.org>
> > Signed-off-by: Allen Chen <allen.chen@ite.com.tw>
> > ---
> >  .../bindings/display/bridge/ite,it6505.yaml   | 89 +++++++++++++++++--
> >  1 file changed, 83 insertions(+), 6 deletions(-)
> >
> > diff --git a/Documentation/devicetree/bindings/display/bridge/ite,it6505.yaml b/Documentation/devicetree/bindings/display/bridge/ite,it6505.yaml
> > index 833d11b2303a7..8e607b6929fc9 100644
> > --- a/Documentation/devicetree/bindings/display/bridge/ite,it6505.yaml
> > +++ b/Documentation/devicetree/bindings/display/bridge/ite,it6505.yaml
> > @@ -52,9 +52,70 @@ properties:
> >      maxItems: 1
> >      description: extcon specifier for the Power Delivery
> >
> > -  port:
> > -    $ref: /schemas/graph.yaml#/properties/port
> > -    description: A port node pointing to DPI host port node
>
> No existing users you are breaking? The commit msg should explain.
>
> > +  ports:
> > +    $ref: /schemas/graph.yaml#/properties/ports
> > +
> > +    properties:
> > +      port@0:
> > +        $ref: /schemas/graph.yaml#/$defs/port-base
> > +        unevaluatedProperties: false
> > +        description: A port node pointing to DPI host port node
> > +
> > +        properties:
> > +          endpoint:
> > +            $ref: /schemas/graph.yaml#/$defs/endpoint-base
> > +            unevaluatedProperties: false
> > +
> > +            properties:
> > +              link-frequencies:
> > +                minItems: 1
> > +                maxItems: 1
> > +                description: Allowed max link frequencies in Hz
> > +
> > +      port@1:
> > +        $ref: /schemas/graph.yaml#/$defs/port-base
> > +        unevaluatedProperties: false
> > +        description: Video port for DP output
> > +
> > +        properties:
> > +          endpoint:
> > +            $ref: /schemas/graph.yaml#/$defs/endpoint-base
> > +            unevaluatedProperties: false
> > +
> > +            properties:
> > +              data-lanes:
> > +                oneOf:
> > +                  - minItems: 1
> > +                    maxItems: 1
> > +                    uniqueItems: true
> > +                    items:
> > +                      enum:
> > +                        - 0
> > +                        - 1
> > +                    description: For one lane operation.
> > +
> > +                  - minItems: 2
> > +                    maxItems: 2
> > +                    uniqueItems: true
> > +                    items:
> > +                      enum:
> > +                        - 0
> > +                        - 1
> > +                    description: For two lanes operation.
> > +
> > +                  - minItems: 4
> > +                    maxItems: 4
> > +                    uniqueItems: true
> > +                    items:
> > +                      enum:
> > +                        - 0
> > +                        - 1
> > +                        - 2
> > +                        - 3
> > +                    description: For four lanes operation.
>
> I would do just:
>
> data-lanes:
>   minItems: 1
>   items:
>     - enum: [ 0, 1 ]
>     - const: 1
>     - const: 2
>     - const: 3

I believe we also want a `uniqueItems: true` to prevent duplicate
items like `<1 1>`.

Regards,
Pin-yen

>
> It does allow 3 lanes, but I don't think that's a big deal. What it does
> doesn't allow is any order and yours does.
>
> Rob

Re: [PATCH v5 1/2] dt-bindings: it6505: add properties to restrict output bandwidth

[Krzysztof Kozlowski]

On 26/10/2022 00:03, Pin-yen Lin wrote:
>>> +                  - minItems: 4
>>> +                    maxItems: 4
>>> +                    uniqueItems: true
>>> +                    items:
>>> +                      enum:
>>> +                        - 0
>>> +                        - 1
>>> +                        - 2
>>> +                        - 3
>>> +                    description: For four lanes operation.
>>
>> I would do just:
>>
>> data-lanes:
>>   minItems: 1
>>   items:
>>     - enum: [ 0, 1 ]
>>     - const: 1
>>     - const: 2
>>     - const: 3
> 
> I believe we also want a `uniqueItems: true` to prevent duplicate
> items like `<1 1>`.

... and are <1 1> passing with Rob's proposal?

Best regards,
Krzysztof

RE: [PATCH v5 1/2] dt-bindings: it6505: add properties to restrict output bandwidth

[allen.chen]

Hi rob

-----Original Message-----
From: Rob Herring <robh@kernel.org> 
Sent: Tuesday, October 25, 2022 12:38 AM
To: Allen Chen (陳柏宇) <allen.chen@ite.com.tw>
Cc: Pin-Yen Lin <treapking@chromium.org>; Jau-Chih Tseng (曾昭智) <Jau-Chih.Tseng@ite.com.tw>; Hermes Wu (吳佳宏) <Hermes.Wu@ite.com.tw>; Kenneth Hung (洪家倫) <Kenneth.Hung@ite.com.tw>; Andrzej Hajda <andrzej.hajda@intel.com>; Neil Armstrong <narmstrong@baylibre.com>; Robert Foss <robert.foss@linaro.org>; Laurent Pinchart <Laurent.pinchart@ideasonboard.com>; Jonas Karlman <jonas@kwiboo.se>; Jernej Skrabec <jernej.skrabec@gmail.com>; David Airlie <airlied@linux.ie>; Daniel Vetter <daniel@ffwll.ch>; Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>; open list:DRM DRIVERS <dri-devel@lists.freedesktop.org>; open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS <devicetree@vger.kernel.org>; open list <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v5 1/2] dt-bindings: it6505: add properties to restrict output bandwidth

On Wed, Oct 19, 2022 at 05:32:13PM +0800, allen wrote:
> From: allen chen <allen.chen@ite.com.tw>
> 
> Add properties to restrict dp output data-lanes and clock.
> 
> Signed-off-by: Pin-Yen Lin <treapking@chromium.org>
> Signed-off-by: Allen Chen <allen.chen@ite.com.tw>
> ---
>  .../bindings/display/bridge/ite,it6505.yaml   | 89 +++++++++++++++++--
>  1 file changed, 83 insertions(+), 6 deletions(-)
> 
> diff --git 
> a/Documentation/devicetree/bindings/display/bridge/ite,it6505.yaml 
> b/Documentation/devicetree/bindings/display/bridge/ite,it6505.yaml
> index 833d11b2303a7..8e607b6929fc9 100644
> --- a/Documentation/devicetree/bindings/display/bridge/ite,it6505.yaml
> +++ b/Documentation/devicetree/bindings/display/bridge/ite,it6505.yaml
> @@ -52,9 +52,70 @@ properties:
>      maxItems: 1
>      description: extcon specifier for the Power Delivery
>  
> -  port:
> -    $ref: /schemas/graph.yaml#/properties/port
> -    description: A port node pointing to DPI host port node

No existing users you are breaking? The commit msg should explain.

==> There are no it6505 users in community.
> +  ports:
> +    $ref: /schemas/graph.yaml#/properties/ports
> +
> +    properties:
> +      port@0:
> +        $ref: /schemas/graph.yaml#/$defs/port-base
> +        unevaluatedProperties: false
> +        description: A port node pointing to DPI host port node
> +
> +        properties:
> +          endpoint:
> +            $ref: /schemas/graph.yaml#/$defs/endpoint-base
> +            unevaluatedProperties: false
> +
> +            properties:
> +              link-frequencies:
> +                minItems: 1
> +                maxItems: 1
> +                description: Allowed max link frequencies in Hz
> +
> +      port@1:
> +        $ref: /schemas/graph.yaml#/$defs/port-base
> +        unevaluatedProperties: false
> +        description: Video port for DP output
> +
> +        properties:
> +          endpoint:
> +            $ref: /schemas/graph.yaml#/$defs/endpoint-base
> +            unevaluatedProperties: false
> +
> +            properties:
> +              data-lanes:
> +                oneOf:
> +                  - minItems: 1
> +                    maxItems: 1
> +                    uniqueItems: true
> +                    items:
> +                      enum:
> +                        - 0
> +                        - 1
> +                    description: For one lane operation.
> +
> +                  - minItems: 2
> +                    maxItems: 2
> +                    uniqueItems: true
> +                    items:
> +                      enum:
> +                        - 0
> +                        - 1
> +                    description: For two lanes operation.
> +
> +                  - minItems: 4
> +                    maxItems: 4
> +                    uniqueItems: true
> +                    items:
> +                      enum:
> +                        - 0
> +                        - 1
> +                        - 2
> +                        - 3
> +                    description: For four lanes operation.

I would do just:

data-lanes:
  minItems: 1
  items:
    - enum: [ 0, 1 ]
    - const: 1
    - const: 2
    - const: 3

It does allow 3 lanes, but I don't think that's a big deal. What it does doesn't allow is any order and yours does.

Rob

Re: [PATCH v5 1/2] dt-bindings: it6505: add properties to restrict output bandwidth

[Pin-yen Lin]

Hi Allen,

On Thu, Oct 27, 2022 at 9:09 AM <allen.chen@ite.com.tw> wrote:
>
> Hi rob
>
> -----Original Message-----
> From: Rob Herring <robh@kernel.org>
> Sent: Tuesday, October 25, 2022 12:38 AM
> To: Allen Chen (陳柏宇) <allen.chen@ite.com.tw>
> Cc: Pin-Yen Lin <treapking@chromium.org>; Jau-Chih Tseng (曾昭智) <Jau-Chih.Tseng@ite.com.tw>; Hermes Wu (吳佳宏) <Hermes.Wu@ite.com.tw>; Kenneth Hung (洪家倫) <Kenneth.Hung@ite.com.tw>; Andrzej Hajda <andrzej.hajda@intel.com>; Neil Armstrong <narmstrong@baylibre.com>; Robert Foss <robert.foss@linaro.org>; Laurent Pinchart <Laurent.pinchart@ideasonboard.com>; Jonas Karlman <jonas@kwiboo.se>; Jernej Skrabec <jernej.skrabec@gmail.com>; David Airlie <airlied@linux.ie>; Daniel Vetter <daniel@ffwll.ch>; Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>; open list:DRM DRIVERS <dri-devel@lists.freedesktop.org>; open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS <devicetree@vger.kernel.org>; open list <linux-kernel@vger.kernel.org>
> Subject: Re: [PATCH v5 1/2] dt-bindings: it6505: add properties to restrict output bandwidth
>
> On Wed, Oct 19, 2022 at 05:32:13PM +0800, allen wrote:
> > From: allen chen <allen.chen@ite.com.tw>
> >
> > Add properties to restrict dp output data-lanes and clock.
> >
> > Signed-off-by: Pin-Yen Lin <treapking@chromium.org>
> > Signed-off-by: Allen Chen <allen.chen@ite.com.tw>
> > ---
> >  .../bindings/display/bridge/ite,it6505.yaml   | 89 +++++++++++++++++--
> >  1 file changed, 83 insertions(+), 6 deletions(-)
> >
> > diff --git
> > a/Documentation/devicetree/bindings/display/bridge/ite,it6505.yaml
> > b/Documentation/devicetree/bindings/display/bridge/ite,it6505.yaml
> > index 833d11b2303a7..8e607b6929fc9 100644
> > --- a/Documentation/devicetree/bindings/display/bridge/ite,it6505.yaml
> > +++ b/Documentation/devicetree/bindings/display/bridge/ite,it6505.yaml
> > @@ -52,9 +52,70 @@ properties:
> >      maxItems: 1
> >      description: extcon specifier for the Power Delivery
> >
> > -  port:
> > -    $ref: /schemas/graph.yaml#/properties/port
> > -    description: A port node pointing to DPI host port node
>
> No existing users you are breaking? The commit msg should explain.
>
> ==> There are no it6505 users in community.

I would say, currently there are no "upstream" users. So, no existing
users to break.

The term "community" is a bit vague and broad.

Regards,
Pin-yen

> > +  ports:
> > +    $ref: /schemas/graph.yaml#/properties/ports
> > +
> > +    properties:
> > +      port@0:
> > +        $ref: /schemas/graph.yaml#/$defs/port-base
> > +        unevaluatedProperties: false
> > +        description: A port node pointing to DPI host port node
> > +
> > +        properties:
> > +          endpoint:
> > +            $ref: /schemas/graph.yaml#/$defs/endpoint-base
> > +            unevaluatedProperties: false
> > +
> > +            properties:
> > +              link-frequencies:
> > +                minItems: 1
> > +                maxItems: 1
> > +                description: Allowed max link frequencies in Hz
> > +
> > +      port@1:
> > +        $ref: /schemas/graph.yaml#/$defs/port-base
> > +        unevaluatedProperties: false
> > +        description: Video port for DP output
> > +
> > +        properties:
> > +          endpoint:
> > +            $ref: /schemas/graph.yaml#/$defs/endpoint-base
> > +            unevaluatedProperties: false
> > +
> > +            properties:
> > +              data-lanes:
> > +                oneOf:
> > +                  - minItems: 1
> > +                    maxItems: 1
> > +                    uniqueItems: true
> > +                    items:
> > +                      enum:
> > +                        - 0
> > +                        - 1
> > +                    description: For one lane operation.
> > +
> > +                  - minItems: 2
> > +                    maxItems: 2
> > +                    uniqueItems: true
> > +                    items:
> > +                      enum:
> > +                        - 0
> > +                        - 1
> > +                    description: For two lanes operation.
> > +
> > +                  - minItems: 4
> > +                    maxItems: 4
> > +                    uniqueItems: true
> > +                    items:
> > +                      enum:
> > +                        - 0
> > +                        - 1
> > +                        - 2
> > +                        - 3
> > +                    description: For four lanes operation.
>
> I would do just:
>
> data-lanes:
>   minItems: 1
>   items:
>     - enum: [ 0, 1 ]
>     - const: 1
>     - const: 2
>     - const: 3
>
> It does allow 3 lanes, but I don't think that's a big deal. What it does doesn't allow is any order and yours does.
>
> Rob