[PATCH v2] ARM: dts: i.MX8MM: describe feature controller

[Ahmad Fatoum]

Now with i.MX8M feature controller driver support available, have the
OCOTP provide feature control on the i.MX8MM to ensure the kernel DT
does not cause Linux to access the VPU and its power domains,
when 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>
---
v1 was RFC patch 10/10 of:
https://lore.barebox.org/barebox/20220818051955.2088238-11-a.fatoum@pengutronix.de/T/#u

Patches 01-08 are still applicable, this replaces the approach in v1
with a standalone feature controller with having the OCOTP as feature
controller, like is done for i.MX8MN in patch 08/10 of above referenced
series.
---
 arch/arm/dts/imx8mm.dtsi | 52 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 52 insertions(+)

diff --git a/arch/arm/dts/imx8mm.dtsi b/arch/arm/dts/imx8mm.dtsi
index cdf212820594..1e81d03d6b84 100644
--- a/arch/arm/dts/imx8mm.dtsi
+++ b/arch/arm/dts/imx8mm.dtsi
@@ -1,10 +1,18 @@
 // SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+
+#include <dt-bindings/features/imx8m.h>
+
 / {
 	aliases {
 		gpr.reboot_mode = &reboot_mode_gpr;
 	};
 };
 
+feat: &ocotp {
+	#feature-cells = <1>;
+	barebox,feature-controller;
+};
+
 &pgc_otg1 {
 	barebox,allow-dummy;
 };
@@ -24,3 +32,47 @@
 		mode-serial = <0x00000010>, <0x40000000>;
 	};
 };
+
+&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>;
+};
+
+&vpu_g1 {
+	barebox,feature-gates = <&feat IMX8M_FEAT_VPU>;
+};
+
+&vpu_g2 {
+	barebox,feature-gates = <&feat IMX8M_FEAT_VPU>;
+};
+
+&vpu_blk_ctrl {
+	barebox,feature-gates = <&feat IMX8M_FEAT_VPU>;
+};
+
+&pgc_vpumix {
+	barebox,feature-gates = <&feat IMX8M_FEAT_VPU>;
+};
+
+&pgc_vpu_g1 {
+	barebox,feature-gates = <&feat IMX8M_FEAT_VPU>;
+};
+
+&pgc_vpu_g2 {
+	barebox,feature-gates = <&feat IMX8M_FEAT_VPU>;
+};
+
+&pgc_vpu_h1 {
+	barebox,feature-gates = <&feat IMX8M_FEAT_VPU>;
+};
-- 
2.30.2