Hello Paul, Maxime. I suggest the patch to fix it.
diff --no-dereference -u -r -N
linux-5.0-rc6_origin/Documentation/devicetree/bindings/display/panel/ronbo,rb070d30.txt
linux-5.0-rc6/Documentation/devicetree/bindings/display/panel/ronbo,rb070d30.txt
---
linux-5.0-rc6_origin/Documentation/devicetree/bindings/display/panel/ronbo,rb070d30.txt
1970-01-01 07:00:00.000000000 +0700
+++
linux-5.0-rc6/Documentation/devicetree/bindings/display/panel/ronbo,rb070d30.txt
2019-02-14 18:00:06.613795857 +0700
@@ -0,0 +1,23 @@
+Ronbo RB070D30N01A MIPI-DSI panel
+
+Required properties:
+ - compatible: must be "ronbo,rb070d30"
+ - reg: DSI virtual channel used by that screen
+ - vcc-lcd-supply: phandle to the power regulator
+ - backlight: phandle to the backlight used
+ - reset-gpios: a GPIO phandle for the reset pin
+ - power-gpios: a GPIO phandle for the power pin
+ - updn-gpios: a GPIO phandle for the updn pin (vertical flip)
+ - shlr-gpios: a GPIO phandle for the shlr pin (horizontal flip)
+
+Example:
+panel@0 {
+ compatible = "ronbo,rb070d30";
+ reg = <0>;
+ vcc-lcd-supply = <®_display>;
+ backlight = <&backlight>;
+ reset-gpios = <&r_pio 0 1 GPIO_ACTIVE_HIGH>; /* PL01 */
+ power-gpios = <&r_pio 0 2 GPIO_ACTIVE_HIGH>; /* PL02 */
+ updn-gpios = <&r_pio 0 3 GPIO_ACTIVE_HIGH>; /* PL03 */
+ shlr-gpios = <&r_pio 0 4 GPIO_ACTIVE_LOW>; /* PL04 */
+};
diff --no-dereference -u -r -N
linux-5.0-rc6_origin/Documentation/devicetree/bindings/vendor-prefixes.txt
linux-5.0-rc6/Documentation/devicetree/bindings/vendor-prefixes.txt
--- linux-5.0-rc6_origin/Documentation/devicetree/bindings/vendor-prefixes.txt
2019-02-11 05:42:20.000000000 +0700
+++ linux-5.0-rc6/Documentation/devicetree/bindings/vendor-prefixes.txt
2019-02-14 17:39:46.667994322 +0700
@@ -334,6 +334,7 @@
riscv RISC-V Foundation
rockchip Fuzhou Rockchip Electronics Co., Ltd
rohm ROHM Semiconductor Co., Ltd
+ronbo Ronbo Electronics Ltd.
roofull Shenzhen Roofull Technology Co, Ltd
samsung Samsung Semiconductor
samtec Samtec/Softing company
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