Re: [RFC v2 PATCH v4 09/14] ARM: dts: s6e3fa0: add DT bindings

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Hi Andrzej

Thank you for comment.

On 04/22/2014 11:02 PM, Andrzej Hajda wrote:
On 04/21/2014 02:28 PM, YoungJun Cho wrote:
This patch adds DT bindings for s6e3fa0 panel.
The bindings describes panel resources, display timings and cpu timings.

Changelog v2:
- Adds unit address (commented by Sachin Kamat)
Changelog v3:
- Removes optional delay, size properties (commented by Laurent Pinchart)
- Adds OLED detection, TE gpio properties
Changelog v4:
- Moves CPU timings relevant properties from FIMD DT
   (commeted by Laurent Pinchart, Andrzej Hajda)

Signed-off-by: YoungJun Cho <yj44.cho@xxxxxxxxxxx>
Acked-by: Inki Dae <inki.dae@xxxxxxxxxxx>
Acked-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
---
  .../devicetree/bindings/panel/samsung,s6e3fa0.txt  |   63 ++++++++++++++++++++
  1 file changed, 63 insertions(+)
  create mode 100644 Documentation/devicetree/bindings/panel/samsung,s6e3fa0.txt

diff --git a/Documentation/devicetree/bindings/panel/samsung,s6e3fa0.txt b/Documentation/devicetree/bindings/panel/samsung,s6e3fa0.txt
new file mode 100644
index 0000000..9eeb38b
--- /dev/null
+++ b/Documentation/devicetree/bindings/panel/samsung,s6e3fa0.txt
@@ -0,0 +1,63 @@
+Samsung S6E3FA0 AMOLED LCD 5.7 inch panel
+
+Required properties:
+  - compatible: "samsung,s6e3fa0"
+  - reg: the virtual channel number of a DSI peripheral
+  - vdd3-supply: core voltage supply
+  - vci-supply: voltage supply for analog circuits
+  - reset-gpio: a GPIO spec for the reset pin
+  - det-gpio: a GPIO spec for the OLED detection pin
+  - te-gpio: a GPIO spec for the TE pin

Just FYI, according to DT documentation [1] gpio spec should be in form
[name]-gpios, however there is plenty bindings with -gpio suffix, so I
am not sure if it is really enforced. On the other side it is enforced
by descriptor based gpio framework[2]. Integer-based gpio framework
used in your driver is obsolete according to [2].

Yes, you're right. That is my mistake.
They should be attached 's'.
At first I used integer-based gpio framework and replaced to descriptor
based one, but did not updated DT bindings.

I'll update again.

Thank you.
Best regards YJ


[1]: Documentation/devicetree/bindings/gpio/gpio.txt
[2]: Documentation/gpio/gpio.txt

Regards
Andrzej

+  - display-timings: timings for the connected panel as described by [1]
+  - cpu-timings: CPU interface timings for the connected panel, and it contains
+        following optional properties.
+          - cs-setup: clock cycles for the active period of address signal
+                enable until chip select is enable in CPU interface
+          - wr-setup: clock cycles for the active period of CS signal enable
+                until write signal is enable in CPU interface
+          - wr-act: clock cycles for the active period of CS enable in CPU
+                interface
+          - wr-hold: clock cycles for the active period of CS disable until
+                write signal is disable in CPU interface
+
+Optional properties:
+
+The device node can contain one 'port' child node with one child
+'endpoint' node, according to the bindings defined in [2]. This
+node should describe panel's video bus.
+
+[1]: Documentation/devicetree/bindings/video/display-timing.txt
+[2]: Documentation/devicetree/bindings/media/video-interfaces.txt
+
+Example:
+
+	panel@0 {
+		compatible = "samsung,s6e3fa0";
+		reg = <0>;
+		vdd3-supply = <&vcclcd_reg>;
+		vci-supply = <&vlcd_reg>;
+		reset-gpio = <&gpy7 4 0>;
+		det-gpio = <&gpg0 6 0>;
+		te-gpio = <&gpd1 7 0>;
+
+		display-timings {
+			timing0: timing-0 {
+				clock-frequency = <0>;
+				hactive = <1080>;
+				vactive = <1920>;
+				hfront-porch = <2>;
+				hback-porch = <2>;
+				hsync-len = <1>;
+				vfront-porch = <1>;
+				vback-porch = <4>;
+				vsync-len = <1>;
+			};
+		};
+
+		cpu-timings {
+			cs-setup = <0>;
+			wr-setup = <0>;
+			wr-act = <1>;
+			wr-hold = <0>;
+		};
+	};




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