Patchwork [4/6] dt-bindings: display: bridge: Add ICN6211 MIPI-DSI to RGB convertor bridge

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Submitter Jagan Teki
Date March 15, 2019, 1:08 p.m.
Message ID <20190315130825.9005-5-jagan@amarulasolutions.com>
Download mbox | patch
Permalink /patch/749529/
State New
Headers show

Comments

Jagan Teki - March 15, 2019, 1:08 p.m.
ICN6211 is MIPI-DSI/RGB converter bridge from chipone.
It has a flexible configuration of MIPI DSI signal input
and produce RGB565, RGB666, RGB888 output format.

Add dt-bingings for it.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
---
 .../display/bridge/chipone,icn6211.txt        | 36 +++++++++++++++++++
 1 file changed, 36 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/display/bridge/chipone,icn6211.txt
Maxime Ripard - March 15, 2019, 1:34 p.m.
On Fri, Mar 15, 2019 at 06:38:23PM +0530, Jagan Teki wrote:
> ICN6211 is MIPI-DSI/RGB converter bridge from chipone.
> It has a flexible configuration of MIPI DSI signal input
> and produce RGB565, RGB666, RGB888 output format.
> 
> Add dt-bingings for it.
> 
> Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
> ---
>  .../display/bridge/chipone,icn6211.txt        | 36 +++++++++++++++++++
>  1 file changed, 36 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/display/bridge/chipone,icn6211.txt
> 
> diff --git a/Documentation/devicetree/bindings/display/bridge/chipone,icn6211.txt b/Documentation/devicetree/bindings/display/bridge/chipone,icn6211.txt
> new file mode 100644
> index 000000000000..7f13efd7ee7f
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/bridge/chipone,icn6211.txt
> @@ -0,0 +1,36 @@
> +Chipone ICN6211 MIPI-DSI to RGB Convertor Bridge
> +
> +ICN6211 is MIPI-DSI/RGB converter bridge from chipone.
> +It has a flexible configuration of MIPI DSI signal input
> +and produce RGB565, RGB666, RGB888 output format.
> +
> +Required properties for RGB:
> +- compatible: must be "chipone,icn6211" and one of:
> +  * "bananapi,icn6211"

Why is that compatible needed?

> +- reg: the virtual channel number of a DSI peripheral
> +- reset-gpios: a GPIO phandle for the reset pin
> +
> +The device node can contain following 'port' child nodes,
> +according to the OF graph bindings defined in [1]:
> +  0: DSI Input, not required, if the bridge is DSI controlled
> +  1: RGB Output, mandatory

Your example doesn't have that input port

Maxime
Jagan Teki - March 18, 2019, 4:58 p.m.
On Fri, Mar 15, 2019 at 7:04 PM Maxime Ripard <maxime.ripard@bootlin.com> wrote:
>
> On Fri, Mar 15, 2019 at 06:38:23PM +0530, Jagan Teki wrote:
> > ICN6211 is MIPI-DSI/RGB converter bridge from chipone.
> > It has a flexible configuration of MIPI DSI signal input
> > and produce RGB565, RGB666, RGB888 output format.
> >
> > Add dt-bingings for it.
> >
> > Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
> > ---
> >  .../display/bridge/chipone,icn6211.txt        | 36 +++++++++++++++++++
> >  1 file changed, 36 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/display/bridge/chipone,icn6211.txt
> >
> > diff --git a/Documentation/devicetree/bindings/display/bridge/chipone,icn6211.txt b/Documentation/devicetree/bindings/display/bridge/chipone,icn6211.txt
> > new file mode 100644
> > index 000000000000..7f13efd7ee7f
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/display/bridge/chipone,icn6211.txt
> > @@ -0,0 +1,36 @@
> > +Chipone ICN6211 MIPI-DSI to RGB Convertor Bridge
> > +
> > +ICN6211 is MIPI-DSI/RGB converter bridge from chipone.
> > +It has a flexible configuration of MIPI DSI signal input
> > +and produce RGB565, RGB666, RGB888 output format.
> > +
> > +Required properties for RGB:
> > +- compatible: must be "chipone,icn6211" and one of:
> > +  * "bananapi,icn6211"
>
> Why is that compatible needed?

chipone,icn6211 - generic compatible bridge controller IC
bananapi,icn6211 -  compatible for icn6211 bridge using on bananapi panel

I hope this would be proper bindings in terms of controller IC with
associate device, anything wrong? Infact I used similar reference from
Ilitek Bananapi panel from here
Documentation/devicetree/bindings/display/panel/ilitek,ili9881c.txt

This is what I understood based on dt-binding, correct if I'm wrong.

ilitek,ili9881c - generic ilitek,ili9881c compatable
bananapi,lhr050h41 - compatible for bananapi panel associated with
this ilitek IC

>
> > +- reg: the virtual channel number of a DSI peripheral
> > +- reset-gpios: a GPIO phandle for the reset pin
> > +
> > +The device node can contain following 'port' child nodes,
> > +according to the OF graph bindings defined in [1]:
> > +  0: DSI Input, not required, if the bridge is DSI controlled
> > +  1: RGB Output, mandatory
>
> Your example doesn't have that input port

Yes, I intentionally did this by referring existing bridge binding.
Documentation/devicetree/bindings/display/bridge/toshiba,tc35876*.txt

Do we really need? since the input port can be part of panel binding.
Chen-Yu Tsai - March 19, 2019, 2:59 a.m.
On Tue, Mar 19, 2019 at 12:58 AM Jagan Teki <jagan@amarulasolutions.com> wrote:
>
> On Fri, Mar 15, 2019 at 7:04 PM Maxime Ripard <maxime.ripard@bootlin.com> wrote:
> >
> > On Fri, Mar 15, 2019 at 06:38:23PM +0530, Jagan Teki wrote:
> > > ICN6211 is MIPI-DSI/RGB converter bridge from chipone.
> > > It has a flexible configuration of MIPI DSI signal input
> > > and produce RGB565, RGB666, RGB888 output format.
> > >
> > > Add dt-bingings for it.
> > >
> > > Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
> > > ---
> > >  .../display/bridge/chipone,icn6211.txt        | 36 +++++++++++++++++++
> > >  1 file changed, 36 insertions(+)
> > >  create mode 100644 Documentation/devicetree/bindings/display/bridge/chipone,icn6211.txt
> > >
> > > diff --git a/Documentation/devicetree/bindings/display/bridge/chipone,icn6211.txt b/Documentation/devicetree/bindings/display/bridge/chipone,icn6211.txt
> > > new file mode 100644
> > > index 000000000000..7f13efd7ee7f
> > > --- /dev/null
> > > +++ b/Documentation/devicetree/bindings/display/bridge/chipone,icn6211.txt
> > > @@ -0,0 +1,36 @@
> > > +Chipone ICN6211 MIPI-DSI to RGB Convertor Bridge
> > > +
> > > +ICN6211 is MIPI-DSI/RGB converter bridge from chipone.
> > > +It has a flexible configuration of MIPI DSI signal input
> > > +and produce RGB565, RGB666, RGB888 output format.
> > > +
> > > +Required properties for RGB:
> > > +- compatible: must be "chipone,icn6211" and one of:
> > > +  * "bananapi,icn6211"
> >
> > Why is that compatible needed?
>
> chipone,icn6211 - generic compatible bridge controller IC
> bananapi,icn6211 -  compatible for icn6211 bridge using on bananapi panel
>
> I hope this would be proper bindings in terms of controller IC with
> associate device, anything wrong? Infact I used similar reference from
> Ilitek Bananapi panel from here
> Documentation/devicetree/bindings/display/panel/ilitek,ili9881c.txt
>
> This is what I understood based on dt-binding, correct if I'm wrong.
>
> ilitek,ili9881c - generic ilitek,ili9881c compatable
> bananapi,lhr050h41 - compatible for bananapi panel associated with
> this ilitek IC

ili9881c is an LCD driver chip with a MIPI DSI interface. It directly
drives the LCD panel, not outputting some RGB stuff. So it is a binding
and driver for a panel, not a bridge in your case.

> >
> > > +- reg: the virtual channel number of a DSI peripheral
> > > +- reset-gpios: a GPIO phandle for the reset pin
> > > +
> > > +The device node can contain following 'port' child nodes,
> > > +according to the OF graph bindings defined in [1]:
> > > +  0: DSI Input, not required, if the bridge is DSI controlled
> > > +  1: RGB Output, mandatory
> >
> > Your example doesn't have that input port
>
> Yes, I intentionally did this by referring existing bridge binding.
> Documentation/devicetree/bindings/display/bridge/toshiba,tc35876*.txt
>
> Do we really need? since the input port can be part of panel binding.

How could the input port of _your_ _bridge_ be part of the panel binding?

ChenYu
Jagan Teki - March 19, 2019, 7:48 a.m.
On Tue, Mar 19, 2019 at 8:29 AM Chen-Yu Tsai <wens@csie.org> wrote:
>
> On Tue, Mar 19, 2019 at 12:58 AM Jagan Teki <jagan@amarulasolutions.com> wrote:
> >
> > On Fri, Mar 15, 2019 at 7:04 PM Maxime Ripard <maxime.ripard@bootlin.com> wrote:
> > >
> > > On Fri, Mar 15, 2019 at 06:38:23PM +0530, Jagan Teki wrote:
> > > > ICN6211 is MIPI-DSI/RGB converter bridge from chipone.
> > > > It has a flexible configuration of MIPI DSI signal input
> > > > and produce RGB565, RGB666, RGB888 output format.
> > > >
> > > > Add dt-bingings for it.
> > > >
> > > > Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
> > > > ---
> > > >  .../display/bridge/chipone,icn6211.txt        | 36 +++++++++++++++++++
> > > >  1 file changed, 36 insertions(+)
> > > >  create mode 100644 Documentation/devicetree/bindings/display/bridge/chipone,icn6211.txt
> > > >
> > > > diff --git a/Documentation/devicetree/bindings/display/bridge/chipone,icn6211.txt b/Documentation/devicetree/bindings/display/bridge/chipone,icn6211.txt
> > > > new file mode 100644
> > > > index 000000000000..7f13efd7ee7f
> > > > --- /dev/null
> > > > +++ b/Documentation/devicetree/bindings/display/bridge/chipone,icn6211.txt
> > > > @@ -0,0 +1,36 @@
> > > > +Chipone ICN6211 MIPI-DSI to RGB Convertor Bridge
> > > > +
> > > > +ICN6211 is MIPI-DSI/RGB converter bridge from chipone.
> > > > +It has a flexible configuration of MIPI DSI signal input
> > > > +and produce RGB565, RGB666, RGB888 output format.
> > > > +
> > > > +Required properties for RGB:
> > > > +- compatible: must be "chipone,icn6211" and one of:
> > > > +  * "bananapi,icn6211"
> > >
> > > Why is that compatible needed?
> >
> > chipone,icn6211 - generic compatible bridge controller IC
> > bananapi,icn6211 -  compatible for icn6211 bridge using on bananapi panel
> >
> > I hope this would be proper bindings in terms of controller IC with
> > associate device, anything wrong? Infact I used similar reference from
> > Ilitek Bananapi panel from here
> > Documentation/devicetree/bindings/display/panel/ilitek,ili9881c.txt
> >
> > This is what I understood based on dt-binding, correct if I'm wrong.
> >
> > ilitek,ili9881c - generic ilitek,ili9881c compatable
> > bananapi,lhr050h41 - compatible for bananapi panel associated with
> > this ilitek IC
>
> ili9881c is an LCD driver chip with a MIPI DSI interface. It directly
> drives the LCD panel, not outputting some RGB stuff. So it is a binding
> and driver for a panel, not a bridge in your case.
>
> > >
> > > > +- reg: the virtual channel number of a DSI peripheral
> > > > +- reset-gpios: a GPIO phandle for the reset pin
> > > > +
> > > > +The device node can contain following 'port' child nodes,
> > > > +according to the OF graph bindings defined in [1]:
> > > > +  0: DSI Input, not required, if the bridge is DSI controlled
> > > > +  1: RGB Output, mandatory
> > >
> > > Your example doesn't have that input port
> >
> > Yes, I intentionally did this by referring existing bridge binding.
> > Documentation/devicetree/bindings/display/bridge/toshiba,tc35876*.txt
> >
> > Do we really need? since the input port can be part of panel binding.
>
> How could the input port of _your_ _bridge_ be part of the panel binding?

Here the panel is from another vendor say bananapi, so the binding of
that part could be already covered ie is what I mean.

Since I mentioned I took the reference binding from another bridge. It
has similar structure of binding / example.
arch/arm/boot/dts/exynos5250-arndale.dts
Bridge example binding:
Documentation/devicetree/bindings/display/bridge/toshiba,tc358764.txt
Panel example binding mentioned here
Documentation/devicetree/bindings/display/panel/boe,hv070wsa-100.txt
Maxime Ripard - March 19, 2019, 8:35 a.m.
On Mon, Mar 18, 2019 at 10:28:10PM +0530, Jagan Teki wrote:
> On Fri, Mar 15, 2019 at 7:04 PM Maxime Ripard <maxime.ripard@bootlin.com> wrote:
> >
> > On Fri, Mar 15, 2019 at 06:38:23PM +0530, Jagan Teki wrote:
> > > ICN6211 is MIPI-DSI/RGB converter bridge from chipone.
> > > It has a flexible configuration of MIPI DSI signal input
> > > and produce RGB565, RGB666, RGB888 output format.
> > >
> > > Add dt-bingings for it.
> > >
> > > Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
> > > ---
> > >  .../display/bridge/chipone,icn6211.txt        | 36 +++++++++++++++++++
> > >  1 file changed, 36 insertions(+)
> > >  create mode 100644 Documentation/devicetree/bindings/display/bridge/chipone,icn6211.txt
> > >
> > > diff --git a/Documentation/devicetree/bindings/display/bridge/chipone,icn6211.txt b/Documentation/devicetree/bindings/display/bridge/chipone,icn6211.txt
> > > new file mode 100644
> > > index 000000000000..7f13efd7ee7f
> > > --- /dev/null
> > > +++ b/Documentation/devicetree/bindings/display/bridge/chipone,icn6211.txt
> > > @@ -0,0 +1,36 @@
> > > +Chipone ICN6211 MIPI-DSI to RGB Convertor Bridge
> > > +
> > > +ICN6211 is MIPI-DSI/RGB converter bridge from chipone.
> > > +It has a flexible configuration of MIPI DSI signal input
> > > +and produce RGB565, RGB666, RGB888 output format.
> > > +
> > > +Required properties for RGB:
> > > +- compatible: must be "chipone,icn6211" and one of:
> > > +  * "bananapi,icn6211"
> >
> > Why is that compatible needed?
>
> chipone,icn6211 - generic compatible bridge controller IC
> bananapi,icn6211 -  compatible for icn6211 bridge using on bananapi panel
>
> I hope this would be proper bindings in terms of controller IC with
> associate device, anything wrong? Infact I used similar reference from
> Ilitek Bananapi panel from here
> Documentation/devicetree/bindings/display/panel/ilitek,ili9881c.txt
>
> This is what I understood based on dt-binding, correct if I'm wrong.

The ILI9881c is an LCD controller, and it has some panel specific
configuration.

Does your bridge have board specific configuration?

Maxime

--
Maxime Ripard, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

Patch

diff --git a/Documentation/devicetree/bindings/display/bridge/chipone,icn6211.txt b/Documentation/devicetree/bindings/display/bridge/chipone,icn6211.txt
new file mode 100644
index 000000000000..7f13efd7ee7f
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/bridge/chipone,icn6211.txt
@@ -0,0 +1,36 @@ 
+Chipone ICN6211 MIPI-DSI to RGB Convertor Bridge
+
+ICN6211 is MIPI-DSI/RGB converter bridge from chipone.
+It has a flexible configuration of MIPI DSI signal input
+and produce RGB565, RGB666, RGB888 output format.
+
+Required properties for RGB:
+- compatible: must be "chipone,icn6211" and one of:
+  * "bananapi,icn6211"
+- reg: the virtual channel number of a DSI peripheral
+- reset-gpios: a GPIO phandle for the reset pin
+
+The device node can contain following 'port' child nodes,
+according to the OF graph bindings defined in [1]:
+  0: DSI Input, not required, if the bridge is DSI controlled
+  1: RGB Output, mandatory
+
+[1]: Documentation/devicetree/bindings/media/video-interfaces.txt
+
+Example:
+
+	bridge@0 {
+		compatible = "bananapi,icn6211", "chipone,icn6211";
+		reg = <0>;
+		reset-gpios = <&pio 3 6 GPIO_ACTIVE_HIGH>; /* LCD-RST: PD6 */
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		port@1 {
+			reg = <1>;
+
+			bridge_out_ep: endpoint {
+				remote-endpoint = <&panel_ep>;
+			};
+		};
+	};