[PATCH v4 1/9] dt-bindings: display: renesas,cmm: Add R-Car CMM documentation

[PATCH v4 1/9] dt-bindings: display: renesas,cmm: Add R-Car CMM documentation

[Jacopo Mondi]

Add device tree bindings documentation for the Renesas R-Car Display
Unit Color Management Module.

CMM is the image enhancement module available on each R-Car DU video
channel on R-Car Gen2 and Gen3 SoCs (V3H and V3M excluded).

Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
---
 .../bindings/display/renesas,cmm.yaml         | 64 +++++++++++++++++++
 1 file changed, 64 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/display/renesas,cmm.yaml

diff --git a/Documentation/devicetree/bindings/display/renesas,cmm.yaml b/Documentation/devicetree/bindings/display/renesas,cmm.yaml
new file mode 100644
index 000000000000..9e5922689cd7
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/renesas,cmm.yaml
@@ -0,0 +1,64 @@
+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/renesas,cmm.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Renesas R-Car Color Management Module (CMM)
+
+maintainers:
+  - Laurent Pinchart <laurent.pinchart@ideasonboard.com>
+  - Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
+  - Jacopo Mondi <jacopo+renesas@jmondi.org>
+
+description: |+
+  Renesas R-Car color management module connected to R-Car DU video channels.
+  It provides image enhancement functions such as 1-D look-up tables (LUT),
+  3-D look-up tables (CMU), 1D-histogram generation (HGO), and color
+  space conversion (CSC).
+
+properties:
+  compatible:
+    items:
+      - enum:
+        - renesas,r8a7795-cmm
+        - renesas,r8a7796-cmm
+        - renesas,r8a77965-cmm
+        - renesas,r8a77990-cmm
+        - renesas,r8a77995-cmm
+      - enum:
+        - renesas,rcar-gen3-cmm
+        - renesas,rcar-gen2-cmm
+  reg:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  resets:
+    maxItems: 1
+
+  power-domains:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - resets
+  - power-domains
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/r8a7796-cpg-mssr.h>
+    #include <dt-bindings/power/r8a7796-sysc.h>
+
+    cmm0: cmm@fea40000 {
+         compatible = "renesas,r8a7796-cmm";
+         reg = <0 0xfea40000 0 0x1000>;
+         power-domains = <&sysc R8A7796_PD_ALWAYS_ON>;
+         clocks = <&cpg CPG_MOD 711>;
+         resets = <&cpg 711>;
+    };
--
2.23.0

[PATCH v4 1/9] dt-bindings: display: renesas,cmm: Add R-Car CMM documentation

[Jacopo Mondi]

Add device tree bindings documentation for the Renesas R-Car Display
Unit Color Management Module.

CMM is the image enhancement module available on each R-Car DU video
channel on R-Car Gen2 and Gen3 SoCs (V3H and V3M excluded).

Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
---
 .../bindings/display/renesas,cmm.yaml         | 64 +++++++++++++++++++
 1 file changed, 64 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/display/renesas,cmm.yaml

diff --git a/Documentation/devicetree/bindings/display/renesas,cmm.yaml b/Documentation/devicetree/bindings/display/renesas,cmm.yaml
new file mode 100644
index 000000000000..9e5922689cd7
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/renesas,cmm.yaml
@@ -0,0 +1,64 @@
+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/renesas,cmm.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Renesas R-Car Color Management Module (CMM)
+
+maintainers:
+  - Laurent Pinchart <laurent.pinchart@ideasonboard.com>
+  - Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
+  - Jacopo Mondi <jacopo+renesas@jmondi.org>
+
+description: |+
+  Renesas R-Car color management module connected to R-Car DU video channels.
+  It provides image enhancement functions such as 1-D look-up tables (LUT),
+  3-D look-up tables (CMU), 1D-histogram generation (HGO), and color
+  space conversion (CSC).
+
+properties:
+  compatible:
+    items:
+      - enum:
+        - renesas,r8a7795-cmm
+        - renesas,r8a7796-cmm
+        - renesas,r8a77965-cmm
+        - renesas,r8a77990-cmm
+        - renesas,r8a77995-cmm
+      - enum:
+        - renesas,rcar-gen3-cmm
+        - renesas,rcar-gen2-cmm
+  reg:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  resets:
+    maxItems: 1
+
+  power-domains:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - resets
+  - power-domains
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/r8a7796-cpg-mssr.h>
+    #include <dt-bindings/power/r8a7796-sysc.h>
+
+    cmm0: cmm@fea40000 {
+         compatible = "renesas,r8a7796-cmm";
+         reg = <0 0xfea40000 0 0x1000>;
+         power-domains = <&sysc R8A7796_PD_ALWAYS_ON>;
+         clocks = <&cpg CPG_MOD 711>;
+         resets = <&cpg 711>;
+    };
--
2.23.0

[PATCH v4 2/9] dt-bindings: display, renesas,du: Document cmms property

[Jacopo Mondi]

Document the newly added 'cmms' property which accepts a list of phandle
and channel index pairs that point to the CMM units available for each
Display Unit output video channel.

Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
---
 Documentation/devicetree/bindings/display/renesas,du.txt | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Documentation/devicetree/bindings/display/renesas,du.txt b/Documentation/devicetree/bindings/display/renesas,du.txt
index c97dfacad281..1773b0a2f54f 100644
--- a/Documentation/devicetree/bindings/display/renesas,du.txt
+++ b/Documentation/devicetree/bindings/display/renesas,du.txt
@@ -45,6 +45,10 @@ Required Properties:
     instance that serves the DU channel, and the channel index identifies the
     LIF instance in that VSP.

+  - renesas,cmms: A list of phandles to the CMM instances present in the SoC,
+    one for each available DU channel. The property shall not be specified for
+    SoCs that do not provide any CMM (such as V3M and V3H).
+
 Required nodes:

 The connections to the DU output video ports are modeled using the OF graph
@@ -91,6 +95,7 @@ Example: R8A7795 (R-Car H3) ES2.0 DU
 			 <&cpg CPG_MOD 721>;
 		clock-names = "du.0", "du.1", "du.2", "du.3";
 		vsps = <&vspd0 0>, <&vspd1 0>, <&vspd2 0>, <&vspd0 1>;
+		renesas,cmms = <&cmm0 &cmm1 &cmm2 &cmm3>;

 		ports {
 			#address-cells = <1>;
--
2.23.0

Re: [PATCH v4 1/9] dt-bindings: display: renesas,cmm: Add R-Car CMM documentation

[Simon Horman]

On Fri, Sep 06, 2019 at 03:43:33PM +0200, Jacopo Mondi wrote:
> Add device tree bindings documentation for the Renesas R-Car Display
> Unit Color Management Module.
> 
> CMM is the image enhancement module available on each R-Car DU video
> channel on R-Car Gen2 and Gen3 SoCs (V3H and V3M excluded).
> 
> Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
> ---
>  .../bindings/display/renesas,cmm.yaml         | 64 +++++++++++++++++++
>  1 file changed, 64 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/display/renesas,cmm.yaml
> 
> diff --git a/Documentation/devicetree/bindings/display/renesas,cmm.yaml b/Documentation/devicetree/bindings/display/renesas,cmm.yaml
> new file mode 100644
> index 000000000000..9e5922689cd7
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/renesas,cmm.yaml
> @@ -0,0 +1,64 @@
> +# SPDX-License-Identifier: GPL-2.0
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/display/renesas,cmm.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Renesas R-Car Color Management Module (CMM)
> +
> +maintainers:
> +  - Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> +  - Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
> +  - Jacopo Mondi <jacopo+renesas@jmondi.org>
> +
> +description: |+
> +  Renesas R-Car color management module connected to R-Car DU video channels.
> +  It provides image enhancement functions such as 1-D look-up tables (LUT),
> +  3-D look-up tables (CMU), 1D-histogram generation (HGO), and color
> +  space conversion (CSC).
> +
> +properties:
> +  compatible:
> +    items:
> +      - enum:
> +        - renesas,r8a7795-cmm
> +        - renesas,r8a7796-cmm
> +        - renesas,r8a77965-cmm
> +        - renesas,r8a77990-cmm
> +        - renesas,r8a77995-cmm
> +      - enum:
> +        - renesas,rcar-gen3-cmm
> +        - renesas,rcar-gen2-cmm

Should we continue the long standing practice in .txt bindings
for Renesas IP blocks to document briefly the purpose of each compat string?

> +  reg:
> +    maxItems: 1
> +
> +  clocks:
> +    maxItems: 1
> +
> +  resets:
> +    maxItems: 1
> +
> +  power-domains:
> +    maxItems: 1
> +
> +required:
> +  - compatible
> +  - reg
> +  - clocks
> +  - resets
> +  - power-domains
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/clock/r8a7796-cpg-mssr.h>
> +    #include <dt-bindings/power/r8a7796-sysc.h>
> +
> +    cmm0: cmm@fea40000 {
> +         compatible = "renesas,r8a7796-cmm";

Should "renesas,rcar-gen3-cmm" be listed as the secondary compat string
here?

> +         reg = <0 0xfea40000 0 0x1000>;
> +         power-domains = <&sysc R8A7796_PD_ALWAYS_ON>;
> +         clocks = <&cpg CPG_MOD 711>;
> +         resets = <&cpg 711>;
> +    };
> --
> 2.23.0
> 

Re: [PATCH v4 2/9] dt-bindings: display, renesas,du: Document cmms property

[Kieran Bingham]

Hi Jacopo,

On 06/09/2019 14:54, Jacopo Mondi wrote:
> Document the newly added 'cmms' property which accepts a list of phandle
> and channel index pairs that point to the CMM units available for each
> Display Unit output video channel.
> 
> Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> ---
>  Documentation/devicetree/bindings/display/renesas,du.txt | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/display/renesas,du.txt b/Documentation/devicetree/bindings/display/renesas,du.txt
> index c97dfacad281..1773b0a2f54f 100644
> --- a/Documentation/devicetree/bindings/display/renesas,du.txt
> +++ b/Documentation/devicetree/bindings/display/renesas,du.txt
> @@ -45,6 +45,10 @@ Required Properties:
>      instance that serves the DU channel, and the channel index identifies the
>      LIF instance in that VSP.
> 
> +  - renesas,cmms: A list of phandles to the CMM instances present in the SoC,
> +    one for each available DU channel. The property shall not be specified for
> +    SoCs that do not provide any CMM (such as V3M and V3H).
> +
>  Required nodes:
> 
>  The connections to the DU output video ports are modeled using the OF graph
> @@ -91,6 +95,7 @@ Example: R8A7795 (R-Car H3) ES2.0 DU
>  			 <&cpg CPG_MOD 721>;
>  		clock-names = "du.0", "du.1", "du.2", "du.3";
>  		vsps = <&vspd0 0>, <&vspd1 0>, <&vspd2 0>, <&vspd0 1>;
> +		renesas,cmms = <&cmm0 &cmm1 &cmm2 &cmm3>;

Should these be comma separated in the same fashion as the vsps are
separated?

I don't really mind either way though ...

Reviewed-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>


> 
>  		ports {
>  			#address-cells = <1>;
> --
> 2.23.0
> 

Re: [PATCH v4 1/9] dt-bindings: display: renesas,cmm: Add R-Car CMM documentation

[Kieran Bingham]

Hi Jacopo,

On 06/09/2019 14:54, Jacopo Mondi wrote:
> Add device tree bindings documentation for the Renesas R-Car Display
> Unit Color Management Module.
> 
> CMM is the image enhancement module available on each R-Car DU video
> channel on R-Car Gen2 and Gen3 SoCs (V3H and V3M excluded).
> 
> Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
> ---
>  .../bindings/display/renesas,cmm.yaml         | 64 +++++++++++++++++++
>  1 file changed, 64 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/display/renesas,cmm.yaml
> 
> diff --git a/Documentation/devicetree/bindings/display/renesas,cmm.yaml b/Documentation/devicetree/bindings/display/renesas,cmm.yaml
> new file mode 100644
> index 000000000000..9e5922689cd7
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/renesas,cmm.yaml
> @@ -0,0 +1,64 @@
> +# SPDX-License-Identifier: GPL-2.0
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/display/renesas,cmm.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Renesas R-Car Color Management Module (CMM)
> +
> +maintainers:
> +  - Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> +  - Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
> +  - Jacopo Mondi <jacopo+renesas@jmondi.org>
> +
> +description: |+
> +  Renesas R-Car color management module connected to R-Car DU video channels.
> +  It provides image enhancement functions such as 1-D look-up tables (LUT),
> +  3-D look-up tables (CMU), 1D-histogram generation (HGO), and color

s/CMU/CLU/


> +  space conversion (CSC).
> +
> +properties:
> +  compatible:
> +    items:
> +      - enum:
> +        - renesas,r8a7795-cmm
> +        - renesas,r8a7796-cmm
> +        - renesas,r8a77965-cmm
> +        - renesas,r8a77990-cmm
> +        - renesas,r8a77995-cmm
> +      - enum:
> +        - renesas,rcar-gen3-cmm
> +        - renesas,rcar-gen2-cmm
> +  reg:
> +    maxItems: 1
> +
> +  clocks:
> +    maxItems: 1
> +
> +  resets:
> +    maxItems: 1
> +
> +  power-domains:
> +    maxItems: 1
> +
> +required:
> +  - compatible
> +  - reg
> +  - clocks
> +  - resets
> +  - power-domains
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/clock/r8a7796-cpg-mssr.h>
> +    #include <dt-bindings/power/r8a7796-sysc.h>
> +
> +    cmm0: cmm@fea40000 {
> +         compatible = "renesas,r8a7796-cmm";
> +         reg = <0 0xfea40000 0 0x1000>;
> +         power-domains = <&sysc R8A7796_PD_ALWAYS_ON>;
> +         clocks = <&cpg CPG_MOD 711>;
> +         resets = <&cpg 711>;
> +    };
> --
> 2.23.0
> 

Re: [PATCH v4 1/9] dt-bindings: display: renesas,cmm: Add R-Car CMM documentation

[Rob Herring]

On Fri, Sep 06, 2019 at 03:54:28PM +0200, Jacopo Mondi wrote:
> Add device tree bindings documentation for the Renesas R-Car Display
> Unit Color Management Module.
> 
> CMM is the image enhancement module available on each R-Car DU video
> channel on R-Car Gen2 and Gen3 SoCs (V3H and V3M excluded).
> 
> Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
> ---
>  .../bindings/display/renesas,cmm.yaml         | 64 +++++++++++++++++++
>  1 file changed, 64 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/display/renesas,cmm.yaml
> 
> diff --git a/Documentation/devicetree/bindings/display/renesas,cmm.yaml b/Documentation/devicetree/bindings/display/renesas,cmm.yaml
> new file mode 100644
> index 000000000000..9e5922689cd7
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/renesas,cmm.yaml
> @@ -0,0 +1,64 @@
> +# SPDX-License-Identifier: GPL-2.0

For new bindings:

GPL-2.0-only OR BSD-2-Clause

> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/display/renesas,cmm.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Renesas R-Car Color Management Module (CMM)
> +
> +maintainers:
> +  - Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> +  - Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
> +  - Jacopo Mondi <jacopo+renesas@jmondi.org>
> +
> +description: |+
> +  Renesas R-Car color management module connected to R-Car DU video channels.
> +  It provides image enhancement functions such as 1-D look-up tables (LUT),
> +  3-D look-up tables (CMU), 1D-histogram generation (HGO), and color
> +  space conversion (CSC).
> +
> +properties:
> +  compatible:
> +    items:
> +      - enum:
> +        - renesas,r8a7795-cmm
> +        - renesas,r8a7796-cmm
> +        - renesas,r8a77965-cmm
> +        - renesas,r8a77990-cmm
> +        - renesas,r8a77995-cmm
> +      - enum:
> +        - renesas,rcar-gen3-cmm
> +        - renesas,rcar-gen2-cmm

This allows 10 valid cases when I imagine there's only really 5. I'm 
okay leaving it, but might be better to split into 2 under a 'oneOf'.

I imagine there will be a lot of these for Renesas, so just be 
consistent.

> +  reg:
> +    maxItems: 1
> +
> +  clocks:
> +    maxItems: 1
> +
> +  resets:
> +    maxItems: 1
> +
> +  power-domains:
> +    maxItems: 1
> +
> +required:
> +  - compatible
> +  - reg
> +  - clocks
> +  - resets
> +  - power-domains
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/clock/r8a7796-cpg-mssr.h>
> +    #include <dt-bindings/power/r8a7796-sysc.h>
> +
> +    cmm0: cmm@fea40000 {
> +         compatible = "renesas,r8a7796-cmm";
> +         reg = <0 0xfea40000 0 0x1000>;
> +         power-domains = <&sysc R8A7796_PD_ALWAYS_ON>;
> +         clocks = <&cpg CPG_MOD 711>;
> +         resets = <&cpg 711>;
> +    };
> --
> 2.23.0
> 

Re: [PATCH v4 2/9] dt-bindings: display, renesas,du: Document cmms property

[Rob Herring]

On Wed, Sep 11, 2019 at 05:06:33PM +0100, Kieran Bingham wrote:
> Hi Jacopo,
> 
> On 06/09/2019 14:54, Jacopo Mondi wrote:
> > Document the newly added 'cmms' property which accepts a list of phandle
> > and channel index pairs that point to the CMM units available for each
> > Display Unit output video channel.
> > 
> > Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
> > Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> > ---
> >  Documentation/devicetree/bindings/display/renesas,du.txt | 5 +++++
> >  1 file changed, 5 insertions(+)
> > 
> > diff --git a/Documentation/devicetree/bindings/display/renesas,du.txt b/Documentation/devicetree/bindings/display/renesas,du.txt
> > index c97dfacad281..1773b0a2f54f 100644
> > --- a/Documentation/devicetree/bindings/display/renesas,du.txt
> > +++ b/Documentation/devicetree/bindings/display/renesas,du.txt
> > @@ -45,6 +45,10 @@ Required Properties:
> >      instance that serves the DU channel, and the channel index identifies the
> >      LIF instance in that VSP.
> > 
> > +  - renesas,cmms: A list of phandles to the CMM instances present in the SoC,
> > +    one for each available DU channel. The property shall not be specified for
> > +    SoCs that do not provide any CMM (such as V3M and V3H).
> > +
> >  Required nodes:
> > 
> >  The connections to the DU output video ports are modeled using the OF graph
> > @@ -91,6 +95,7 @@ Example: R8A7795 (R-Car H3) ES2.0 DU
> >  			 <&cpg CPG_MOD 721>;
> >  		clock-names = "du.0", "du.1", "du.2", "du.3";
> >  		vsps = <&vspd0 0>, <&vspd1 0>, <&vspd2 0>, <&vspd0 1>;
> > +		renesas,cmms = <&cmm0 &cmm1 &cmm2 &cmm3>;
> 
> Should these be comma separated in the same fashion as the vsps are
> separated?

Yes. Doesn't matter from a dtb standpoint, but the schema are going to 
be stricter here. Bracket each unit.

With that,

Reviewed-by: Rob Herring <robh@kernel.org>

> 
> I don't really mind either way though ...
> 
> Reviewed-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
> 
> 
> > 
> >  		ports {
> >  			#address-cells = <1>;
> > --
> > 2.23.0
> > 
> 

Re: [PATCH v4 1/9] dt-bindings: display: renesas,cmm: Add R-Car CMM documentation

[Laurent Pinchart]

Hi Jacopo,

Thank you for the patch.

On Fri, Sep 06, 2019 at 03:54:28PM +0200, Jacopo Mondi wrote:
> Add device tree bindings documentation for the Renesas R-Car Display
> Unit Color Management Module.
> 
> CMM is the image enhancement module available on each R-Car DU video
> channel on R-Car Gen2 and Gen3 SoCs (V3H and V3M excluded).
> 
> Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org>

With the small issues pointed out by Kieran and Rob fixed,

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

> ---
>  .../bindings/display/renesas,cmm.yaml         | 64 +++++++++++++++++++
>  1 file changed, 64 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/display/renesas,cmm.yaml
> 
> diff --git a/Documentation/devicetree/bindings/display/renesas,cmm.yaml b/Documentation/devicetree/bindings/display/renesas,cmm.yaml
> new file mode 100644
> index 000000000000..9e5922689cd7
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/renesas,cmm.yaml
> @@ -0,0 +1,64 @@
> +# SPDX-License-Identifier: GPL-2.0
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/display/renesas,cmm.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Renesas R-Car Color Management Module (CMM)
> +
> +maintainers:
> +  - Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> +  - Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
> +  - Jacopo Mondi <jacopo+renesas@jmondi.org>
> +
> +description: |+
> +  Renesas R-Car color management module connected to R-Car DU video channels.
> +  It provides image enhancement functions such as 1-D look-up tables (LUT),
> +  3-D look-up tables (CMU), 1D-histogram generation (HGO), and color
> +  space conversion (CSC).
> +
> +properties:
> +  compatible:
> +    items:
> +      - enum:
> +        - renesas,r8a7795-cmm
> +        - renesas,r8a7796-cmm
> +        - renesas,r8a77965-cmm
> +        - renesas,r8a77990-cmm
> +        - renesas,r8a77995-cmm
> +      - enum:
> +        - renesas,rcar-gen3-cmm
> +        - renesas,rcar-gen2-cmm
> +  reg:
> +    maxItems: 1
> +
> +  clocks:
> +    maxItems: 1
> +
> +  resets:
> +    maxItems: 1
> +
> +  power-domains:
> +    maxItems: 1
> +
> +required:
> +  - compatible
> +  - reg
> +  - clocks
> +  - resets
> +  - power-domains
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/clock/r8a7796-cpg-mssr.h>
> +    #include <dt-bindings/power/r8a7796-sysc.h>
> +
> +    cmm0: cmm@fea40000 {
> +         compatible = "renesas,r8a7796-cmm";
> +         reg = <0 0xfea40000 0 0x1000>;
> +         power-domains = <&sysc R8A7796_PD_ALWAYS_ON>;
> +         clocks = <&cpg CPG_MOD 711>;
> +         resets = <&cpg 711>;
> +    };

-- 
Regards,

Laurent Pinchart