From 6c69a54be58c4a82c60eab1e9211e15d8ca7c816 Mon Sep 17 00:00:00 2001
From: Yi-Wei Wang <yiweiw@nvidia.com>
Date: Wed, 2 Aug 2023 15:15:54 +0800
Subject: [PATCH] t23x: overlay: Disable rail-gating for safety IGX

This change disables GPU rail-gating as it's not a mandatory feature for
safety IGX. The ideal approach for disabling GPU rail-gating should be
deleting the `power-domains` property in GPU node. But the
/delete-property/ is not a valid syntax in the device tree overlay, the
`nvidia,tegra-joint_xpu_rail` is specified to achieve the same as an
alternative.

Bug 4084478

Signed-off-by: Yi-Wei Wang <yiweiw@nvidia.com>
Change-Id: Ia186cc0bc18f5d1a216a511af3e5cc4588c07b21
Reviewed-on: https://git-master.nvidia.com/r/c/device/hardware/nvidia/t23x-public-dts/+/2946710
Reviewed-by: Sagar Kamble <skamble@nvidia.com>
Reviewed-by: svcacv <svcacv@nvidia.com>
Reviewed-by: Rajkumar Kasirajan <rkasirajan@nvidia.com>
Reviewed-by: Laxman Dewangan <ldewangan@nvidia.com>
GVS: Gerrit_Virtual_Submit <buildbot_gerritrpt@nvidia.com>
---
 overlay/tegra234-p3740-0002+p3701-0008-safety.dts | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/overlay/tegra234-p3740-0002+p3701-0008-safety.dts b/overlay/tegra234-p3740-0002+p3701-0008-safety.dts
index 935c119..af6f713 100644
--- a/overlay/tegra234-p3740-0002+p3701-0008-safety.dts
+++ b/overlay/tegra234-p3740-0002+p3701-0008-safety.dts
@@ -30,6 +30,19 @@
 					};
 				};
 			};
+
+			chosen {
+				/*
+				 * The ideal approach for disabling rail-gating
+				 * for GPU should be deleting the power-domains
+				 * property in GPU node. But /delete-property/
+				 * is not a valid syntax in the device tree
+				 * overlay, the nvidia,tegra-joint_xpu_rail is
+				 * specified to achieve the same as an
+				 * alternative.
+				 */
+				nvidia,tegra-joint_xpu_rail;
+			};
 		};
 	};