[PATCH 08/10] ARM: dts: i.MX8MN: describe feature controller

[Ahmad Fatoum]

Now with i.MX8M feature controller driver support available, have the
OCOTP provide feature control on the i.MX8MN to ensure the kernel DT does
not attempt accessing the GPU and its power domain if barebox knows
them to be unavailable.

This is needed because the upstream kernel imx8mm.dtsi only describes
the full-featured SoC, which can lead to hangs when instantiating
drivers for hardware that's unavailable in a less-featureful variant
of the SoC.

Signed-off-by: Ahmad Fatoum <a.fatoum at pengutronix.de>
---
 arch/arm/dts/imx8mn.dtsi | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/arch/arm/dts/imx8mn.dtsi b/arch/arm/dts/imx8mn.dtsi
index 176125e73bce..c8ea034e9553 100644
--- a/arch/arm/dts/imx8mn.dtsi
+++ b/arch/arm/dts/imx8mn.dtsi
@@ -1,5 +1,37 @@
 // SPDX-License-Identifier: (GPL-2.0+ OR MIT)
 
+#include <dt-bindings/features/imx8m.h>
+
 &pgc_otg1 {
 	barebox,allow-dummy;
 };
+
+
+feat: &ocotp {
+	#feature-cells = <1>;
+	barebox,feature-controller;
+};
+
+&A53_1 {
+	barebox,feature-gates = <&feat IMX8M_FEAT_CPU_DUAL>;
+};
+
+&A53_2 {
+	barebox,feature-gates = <&feat IMX8M_FEAT_CPU_QUAD>;
+};
+
+&A53_3 {
+	barebox,feature-gates = <&feat IMX8M_FEAT_CPU_QUAD>;
+};
+
+&gpc {
+	barebox,feature-gates = <&feat 0>;
+};
+
+&gpu {
+	barebox,feature-gates = <&feat IMX8M_FEAT_GPU>;
+};
+
+&pgc_gpumix {
+	barebox,feature-gates = <&feat IMX8M_FEAT_GPU>;
+};
-- 
2.30.2