arm64: dts: imx8mm-venice-gw7901.dts: disable pgc_gpumix

Since commit b21269b12e48 ("arm64: dts: imx8mm: add GPC node") the
GW7901 will hang during kernel init because it does not power the unused
GPU voltage rails on the IMX8MM. Disable pgc_gpumix to work around this.

We also disable the GPU devices that depend on the gpumix power domain
and pgc_gpu to avoid them staying in a probe deferred state forever.

Additionally as the MIPI voltage rail is also not connected on this
board we disable pgc_mipi and disp_blk_ctrl.
Signed-off-by: Tim Harvey <tharvey@gateworks.com>
Reviewed-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm64/boot/dts/freescale/imx8mm-venice-gw7901.dts

@@ -255,6 +255,10 @@ opp-750M {
 	};
 };
 
+&disp_blk_ctrl {
+	status = "disabled";
+};
+
 &ecspi1 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_spi1>;
@@ -282,6 +286,14 @@ fixed-link {
 	};
 };
 
+&gpu_2d {
+	status = "disabled";
+};
+
+&gpu_3d {
+	status = "disabled";
+};
+
 &i2c1 {
 	clock-frequency = <100000>;
 	pinctrl-names = "default";
@@ -632,6 +644,18 @@ &i2c4 {
 	status = "okay";
 };
 
+&pgc_gpu {
+	status = "disabled";
+};
+
+&pgc_gpumix {
+	status = "disabled";
+};
+
+&pgc_mipi {
+	status = "disabled";
+};
+
 &uart1 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_uart1>, <&pinctrl_uart1_gpio>;