[PATCH 2/2] arm64: dts: PinePhone Pro: describe the OV8858 user camera

Olivier Benjamin
2025-01-19T23:01:08Z

Add the description of the front/user camera (OV8858) on the PinePhone Pro
to the device dts file.
It receives commands over SCCB, an I2C-compatible protocol, at
I2C address 0x36 and transmits data over CSI-MIPI.
I confirmed this address experimentally.

The pin control mapping was again extracted from the PinePhone Pro
schematic v1.0 as well as the RK3399 datasheet revision 1.8.

Table 2-3 in section 2.8 of the RK3399 datasheet contains the mapping
of IO functions for the SoC pins. Page 52 shows GPIO1_A4, page 54 shows
GPIO2_B4.

For the reset (RESET) signal:
page 11 quadrant D2 | p.18 q.B3-4 | p.18 q.C2
RK3399_E.R28 -> GPIO1_A4 -> Camera2_RST -> MIPI_RST1 -> OV8858.12

For the powerdown (PWDN) signal:
page 9 quadrants D4-5 | p.18 q.B2
RK3399_L.F31 -> GPIO2_B4 -> DVP_PDN0_H -> OV8858.14

Helped-by: Dragan Simic <dsimic@manjaro.org>
Co-developed-by: Ondrej Jirman <megi@xff.cz>
Signed-off-by: Ondrej Jirman <megi@xff.cz>
Signed-off-by: Olivier Benjamin <olivier.benjamin@bootlin.com>
---
.../boot/dts/rockchip/rk3399-pinephone-pro.dts | 45 ++++++++++++++++++++++
1 file changed, 45 insertions(+)

diff --git a/arch/arm64/boot/dts/rockchip/rk3399-pinephone-pro.dts b/arch/arm64/boot/dts/rockchip/rk3399-pinephone-pro.dts
index 4c059b4cda198b0f1973c7bba677ce12d37211b3..9129320b51e6a870f8b86d4bc6bb2ea39d9ab483 100644
--- a/arch/arm64/boot/dts/rockchip/rk3399-pinephone-pro.dts
+++ b/arch/arm64/boot/dts/rockchip/rk3399-pinephone-pro.dts
@@ -481,6 +481,27 @@ wcam_lens: camera-lens@c {
/* Same I2c bus as both cameras, depends on vcca1v8_codec for power. */
vcc-supply = <&vcc1v8_dvp>;
};
+
+ ucam: camera@36 {
+ compatible = "ovti,ov8858";
+ reg = <0x36>;
+ clocks = <&cru SCLK_CIF_OUT>; /* MIPI_MCLK1, derived from CIF_CLK0 */
+ clock-names = "xvclk";
+ pinctrl-names = "default";
+ pinctrl-0 = <&ucam_rst &ucam_pwdn>;
+ dovdd-supply = <&vcc1v8_dvp>;
+ reset-gpios = <&gpio1 RK_PA4 GPIO_ACTIVE_LOW>;
+ powerdown-gpios = <&gpio2 RK_PB4 GPIO_ACTIVE_LOW>;
+ orientation = <0>; /* V4L2_CAMERA_ORIENTATION_FRONT */
+ rotation = <90>;
+
+ port {
+ ucam_out: endpoint {
+ remote-endpoint = <&mipi_in_ucam>;
+ data-lanes = <1 2 3 4>;
+ };
+ };
+ };
};

&i2c3 {
@@ -546,6 +567,24 @@ &io_domains {
status = "okay";
};

+&isp0 {
+ status = "okay";
+
+ ports {
+ port@0 {
+ mipi_in_ucam: endpoint@0 {
+ reg = <0>;
+ remote-endpoint = <&ucam_out>;
+ data-lanes = <1 2 3 4>;
+ };
+ };
+ };
+};
+
+&isp0_mmu {
+ status = "okay";
+};
+
&isp1 {
status = "okay";

@@ -621,6 +660,12 @@ camera {
wcam_rst: wcam-rst {
rockchip,pins = <1 RK_PA0 RK_FUNC_GPIO &pcfg_pull_none>;
};
+ ucam_rst: ucam-rst {
+ rockchip,pins = <1 RK_PA4 RK_FUNC_GPIO &pcfg_pull_none>;
+ };
+ ucam_pwdn: ucam-pwdn {
+ rockchip,pins = <2 RK_PB4 RK_FUNC_GPIO &pcfg_pull_none>;
+ };
};

leds {

--
2.47.1