[PATCH v4] ARM: dts: iwg20d-q7-common: Fix touch controller probe failure

[PATCH v4] ARM: dts: iwg20d-q7-common: Fix touch controller probe failure

[Biju Das]

As per the iWave RZ/G1M schematic, the signal LVDS_PPEN controls supply
voltage for touch panel, LVDS receiver and RGB LCD panel. Add regulator
for these device nodes and remove powerdown-gpios property from
lvds-receiver node as it results in touch controller driver probe failure.

Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
---
This patch depend on below patches

1) https://patchwork.kernel.org/patch/11707595/
2) https://patchwork.kernel.org/patch/11707593/

v3->v4 : Incorporated Laurent's review comments(https://patchwork.kernel.org/patch/11707887/)
         Added Laurent's Reviewed-by tag
v2->v3 : Added the missing part from the patch. removal of powerdown-gpios property.
v1->v2 : Add regulator in touch panel, LVDS receiver and RGB LCD panel device nodes
           (Ref: https://patchwork.kernel.org/patch/11707559/)
v1 : https://patchwork.kernel.org/patch/11705819/
---
 arch/arm/boot/dts/iwg20d-q7-common.dtsi | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/arch/arm/boot/dts/iwg20d-q7-common.dtsi b/arch/arm/boot/dts/iwg20d-q7-common.dtsi
index ebbe1518ef8a..afb7f0de9c7e 100644
--- a/arch/arm/boot/dts/iwg20d-q7-common.dtsi
+++ b/arch/arm/boot/dts/iwg20d-q7-common.dtsi
@@ -57,7 +57,7 @@
 
 	lvds-receiver {
 		compatible = "ti,ds90cf384a", "lvds-decoder";
-		powerdown-gpios = <&gpio7 25 GPIO_ACTIVE_LOW>;
+		vcc-supply = <&vcc_3v3_tft1>;
 
 		ports {
 			#address-cells = <1>;
@@ -81,6 +81,7 @@
 	panel {
 		compatible = "edt,etm0700g0dh6";
 		backlight = <&lcd_backlight>;
+		power-supply = <&vcc_3v3_tft1>;
 
 		port {
 			panel_in: endpoint {
@@ -113,6 +114,17 @@
 		};
 	};
 
+	vcc_3v3_tft1: regulator-panel {
+		compatible = "regulator-fixed";
+
+		regulator-name = "vcc-3v3-tft1";
+		regulator-min-microvolt = <3300000>;
+		regulator-max-microvolt = <3300000>;
+		enable-active-high;
+		startup-delay-us = <500>;
+		gpio = <&gpio7 25 GPIO_ACTIVE_HIGH>;
+	};
+
 	vcc_sdhi1: regulator-vcc-sdhi1 {
 		compatible = "regulator-fixed";
 
@@ -207,6 +219,7 @@
 		reg = <0x38>;
 		interrupt-parent = <&gpio2>;
 		interrupts = <12 IRQ_TYPE_EDGE_FALLING>;
+		vcc-supply = <&vcc_3v3_tft1>;
 	};
 };
 
-- 
2.17.1