[PATCH v2 0/2] *** IT6505 driver read dt properties ***

[PATCH v2 0/2] *** IT6505 driver read dt properties ***

[allen]

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

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

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

 .../bindings/display/bridge/ite,it6505.yaml   | 10 ++++++
 drivers/gpu/drm/bridge/ite-it6505.c           | 35 +++++++++++++++++--
 2 files changed, 42 insertions(+), 3 deletions(-)

-- 
2.25.1

[PATCH v2 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>
---
 .../devicetree/bindings/display/bridge/ite,it6505.yaml | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/Documentation/devicetree/bindings/display/bridge/ite,it6505.yaml b/Documentation/devicetree/bindings/display/bridge/ite,it6505.yaml
index 833d11b2303a..62b9f2192202 100644
--- a/Documentation/devicetree/bindings/display/bridge/ite,it6505.yaml
+++ b/Documentation/devicetree/bindings/display/bridge/ite,it6505.yaml
@@ -52,6 +52,14 @@ properties:
     maxItems: 1
     description: extcon specifier for the Power Delivery
 
+  data-lanes:
+    maxItems: 1
+    description: restrict the dp output data-lanes with value of 1-4
+
+  max-pixel-clock-khz:
+    maxItems: 1
+    description: restrict max pixel clock
+
   port:
     $ref: /schemas/graph.yaml#/properties/port
     description: A port node pointing to DPI host port node
@@ -84,6 +92,8 @@ examples:
             pwr18-supply = <&it6505_pp18_reg>;
             reset-gpios = <&pio 179 1>;
             extcon = <&usbc_extcon>;
+            data-lanes = <2>;
+            max-pixel-clock-khz = <150000>;
 
             port {
                 it6505_in: endpoint {
-- 
2.25.1

Re: [PATCH v2 1/2] dt-bindings: it6505: add properties to restrict output bandwidth

[Neil Armstrong]

Hi,

On 29/09/2022 03:44, 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>
> ---
>   .../devicetree/bindings/display/bridge/ite,it6505.yaml | 10 ++++++++++
>   1 file changed, 10 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/display/bridge/ite,it6505.yaml b/Documentation/devicetree/bindings/display/bridge/ite,it6505.yaml
> index 833d11b2303a..62b9f2192202 100644
> --- a/Documentation/devicetree/bindings/display/bridge/ite,it6505.yaml
> +++ b/Documentation/devicetree/bindings/display/bridge/ite,it6505.yaml
> @@ -52,6 +52,14 @@ properties:
>       maxItems: 1
>       description: extcon specifier for the Power Delivery
>   
> +  data-lanes:
> +    maxItems: 1
> +    description: restrict the dp output data-lanes with value of 1-4

Can't you use the data-lanes property in the first port endpoint ?

Look at Documentation/devicetree/bindings/display/bridge/ti,sn65dsi83.yaml

> +
> +  max-pixel-clock-khz:
> +    maxItems: 1
> +    description: restrict max pixel clock

New vendor specific properties should have the ite, prefix.

> +
>     port:
>       $ref: /schemas/graph.yaml#/properties/port
>       description: A port node pointing to DPI host port node
> @@ -84,6 +92,8 @@ examples:
>               pwr18-supply = <&it6505_pp18_reg>;
>               reset-gpios = <&pio 179 1>;
>               extcon = <&usbc_extcon>;
> +            data-lanes = <2>;
> +            max-pixel-clock-khz = <150000>;
>   
>               port {
>                   it6505_in: endpoint {

Thanks,
Neil

Re: [PATCH v2 1/2] dt-bindings: it6505: add properties to restrict output bandwidth

[Krzysztof Kozlowski]

On 29/09/2022 03:44, 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>
> ---
>  .../devicetree/bindings/display/bridge/ite,it6505.yaml | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/display/bridge/ite,it6505.yaml b/Documentation/devicetree/bindings/display/bridge/ite,it6505.yaml
> index 833d11b2303a..62b9f2192202 100644
> --- a/Documentation/devicetree/bindings/display/bridge/ite,it6505.yaml
> +++ b/Documentation/devicetree/bindings/display/bridge/ite,it6505.yaml
> @@ -52,6 +52,14 @@ properties:
>      maxItems: 1
>      description: extcon specifier for the Power Delivery
>  
> +  data-lanes:
> +    maxItems: 1
> +    description: restrict the dp output data-lanes with value of 1-4

Where is the definition of this property?

> +
> +  max-pixel-clock-khz:
> +    maxItems: 1
> +    description: restrict max pixel clock

This looks wrong. You do not use proper unit suffix
(https://github.com/devicetree-org/dt-schema/blob/main/dtschema/schemas/property-units.yaml),
no vendor prefix, no type and weird maxItems like it was array. Is it
coming from any other schema?

Best regards,
Krzysztof

RE: [PATCH v2 1/2] dt-bindings: it6505: add properties to restrict output bandwidth

[allen.chen]

Hi

data-lanes is output configuration. Maybe it is not suitable to put data-lanes in input endpoint.
extcon doesn't have output endpoint, so I don't know where to put is better.

-----Original Message-----
From: Neil Armstrong <neil.armstrong@linaro.org> 
Sent: Thursday, September 29, 2022 4:40 PM
To: Allen Chen (陳柏宇) <allen.chen@ite.com.tw>
Cc: open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS <devicetree@vger.kernel.org>; Kenneth Hung (洪家倫) <Kenneth.Hung@ite.com.tw>; Jernej Skrabec <jernej.skrabec@gmail.com>; Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>; Jau-Chih Tseng (曾昭智) <Jau-Chih.Tseng@ite.com.tw>; David Airlie <airlied@linux.ie>; open list:DRM DRIVERS <dri-devel@lists.freedesktop.org>; Neil Armstrong <narmstrong@baylibre.com>; open list <linux-kernel@vger.kernel.org>; Robert Foss <robert.foss@linaro.org>; Pin-yen Lin <treapking@chromium.org>; Hermes Wu (吳佳宏) <Hermes.Wu@ite.com.tw>; Rob Herring <robh+dt@kernel.org>; Laurent Pinchart <Laurent.pinchart@ideasonboard.com>; Andrzej Hajda <andrzej.hajda@intel.com>; Jonas Karlman <jonas@kwiboo.se>
Subject: Re: [PATCH v2 1/2] dt-bindings: it6505: add properties to restrict output bandwidth

Hi,

On 29/09/2022 03:44, 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>
> ---
>   .../devicetree/bindings/display/bridge/ite,it6505.yaml | 10 ++++++++++
>   1 file changed, 10 insertions(+)
> 
> diff --git 
> a/Documentation/devicetree/bindings/display/bridge/ite,it6505.yaml 
> b/Documentation/devicetree/bindings/display/bridge/ite,it6505.yaml
> index 833d11b2303a..62b9f2192202 100644
> --- a/Documentation/devicetree/bindings/display/bridge/ite,it6505.yaml
> +++ b/Documentation/devicetree/bindings/display/bridge/ite,it6505.yaml
> @@ -52,6 +52,14 @@ properties:
>       maxItems: 1
>       description: extcon specifier for the Power Delivery
>   
> +  data-lanes:
> +    maxItems: 1
> +    description: restrict the dp output data-lanes with value of 1-4

Can't you use the data-lanes property in the first port endpoint ?

Look at Documentation/devicetree/bindings/display/bridge/ti,sn65dsi83.yaml

> +
> +  max-pixel-clock-khz:
> +    maxItems: 1
> +    description: restrict max pixel clock

New vendor specific properties should have the ite, prefix.

> +
>     port:
>       $ref: /schemas/graph.yaml#/properties/port
>       description: A port node pointing to DPI host port node @@ -84,6 
> +92,8 @@ examples:
>               pwr18-supply = <&it6505_pp18_reg>;
>               reset-gpios = <&pio 179 1>;
>               extcon = <&usbc_extcon>;
> +            data-lanes = <2>;
> +            max-pixel-clock-khz = <150000>;
>   
>               port {
>                   it6505_in: endpoint {

Thanks,
Neil

Re: [PATCH v2 1/2] dt-bindings: it6505: add properties to restrict output bandwidth

[neil.armstrong]

On 05/10/2022 08:19, allen.chen@ite.com.tw wrote:
> Hi
> 
> data-lanes is output configuration. Maybe it is not suitable to put data-lanes in input endpoint.
> extcon doesn't have output endpoint, so I don't know where to put is better.

Ok it wasn't clear enough

Then rename the property to something more specific like:
ite,dp-output-data-lane-count

Use the same naming scheme for the other property:
ite,dp-output-max-pixel-clock-khz

Neil

> 
> -----Original Message-----
> From: Neil Armstrong <neil.armstrong@linaro.org>
> Sent: Thursday, September 29, 2022 4:40 PM
> To: Allen Chen (陳柏宇) <allen.chen@ite.com.tw>
> Cc: open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS <devicetree@vger.kernel.org>; Kenneth Hung (洪家倫) <Kenneth.Hung@ite.com.tw>; Jernej Skrabec <jernej.skrabec@gmail.com>; Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>; Jau-Chih Tseng (曾昭智) <Jau-Chih.Tseng@ite.com.tw>; David Airlie <airlied@linux.ie>; open list:DRM DRIVERS <dri-devel@lists.freedesktop.org>; Neil Armstrong <narmstrong@baylibre.com>; open list <linux-kernel@vger.kernel.org>; Robert Foss <robert.foss@linaro.org>; Pin-yen Lin <treapking@chromium.org>; Hermes Wu (吳佳宏) <Hermes.Wu@ite.com.tw>; Rob Herring <robh+dt@kernel.org>; Laurent Pinchart <Laurent.pinchart@ideasonboard.com>; Andrzej Hajda <andrzej.hajda@intel.com>; Jonas Karlman <jonas@kwiboo.se>
> Subject: Re: [PATCH v2 1/2] dt-bindings: it6505: add properties to restrict output bandwidth
> 
> Hi,
> 
> On 29/09/2022 03:44, 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>
>> ---
>>    .../devicetree/bindings/display/bridge/ite,it6505.yaml | 10 ++++++++++
>>    1 file changed, 10 insertions(+)
>>
>> diff --git
>> a/Documentation/devicetree/bindings/display/bridge/ite,it6505.yaml
>> b/Documentation/devicetree/bindings/display/bridge/ite,it6505.yaml
>> index 833d11b2303a..62b9f2192202 100644
>> --- a/Documentation/devicetree/bindings/display/bridge/ite,it6505.yaml
>> +++ b/Documentation/devicetree/bindings/display/bridge/ite,it6505.yaml
>> @@ -52,6 +52,14 @@ properties:
>>        maxItems: 1
>>        description: extcon specifier for the Power Delivery
>>    
>> +  data-lanes:
>> +    maxItems: 1
>> +    description: restrict the dp output data-lanes with value of 1-4
> 
> Can't you use the data-lanes property in the first port endpoint ?
> 
> Look at Documentation/devicetree/bindings/display/bridge/ti,sn65dsi83.yaml
> 
>> +
>> +  max-pixel-clock-khz:
>> +    maxItems: 1
>> +    description: restrict max pixel clock
> 
> New vendor specific properties should have the ite, prefix.
> 
>> +
>>      port:
>>        $ref: /schemas/graph.yaml#/properties/port
>>        description: A port node pointing to DPI host port node @@ -84,6
>> +92,8 @@ examples:
>>                pwr18-supply = <&it6505_pp18_reg>;
>>                reset-gpios = <&pio 179 1>;
>>                extcon = <&usbc_extcon>;
>> +            data-lanes = <2>;
>> +            max-pixel-clock-khz = <150000>;
>>    
>>                port {
>>                    it6505_in: endpoint {
> 
> Thanks,
> Neil