From: Thierry Reding treding@nvidia.com
This node contains two sets of properties, one for the case where the VPR is resizable (in which case the VPR region will be dynamically allocated at boot time) and another case where the VPR is fixed in size and initialized by early firmware.
The firmware running on the device is responsible for updating the node with the real physical address for the fixed VPR case and remove the properties needed only for resizable VPR. Similarly, if the VPR is resizable, the firmware should remove the "reg" property since it is no longer needed.
Signed-off-by: Thierry Reding treding@nvidia.com --- Changes in v3: - comment out fixed VPR properties, assume resizable by default - rename node to "protected" --- arch/arm64/boot/dts/nvidia/tegra234.dtsi | 39 ++++++++++++++++++++++++++++++++ 1 file changed, 39 insertions(+)
diff --git a/arch/arm64/boot/dts/nvidia/tegra234.dtsi b/arch/arm64/boot/dts/nvidia/tegra234.dtsi index 8e0c51e496e2..52ff11873580 100644 --- a/arch/arm64/boot/dts/nvidia/tegra234.dtsi +++ b/arch/arm64/boot/dts/nvidia/tegra234.dtsi @@ -29,6 +29,45 @@ aliases { i2c8 = &dp_aux_ch3_i2c; };
+ reserved-memory { + #address-cells = <2>; + #size-cells = <2>; + ranges; + + vpr: protected { + compatible = "nvidia,tegra-video-protection-region"; + status = "disabled"; + + /* + * Two variants exist for this. For fixed VPR, the + * firmware is supposed to update the "reg" property + * with the fixed memory region configured as VPR. + * + * For resizable VPR we don't care about the exact + * address and instead want a reserved region to be + * allocated with a certain size and alignment at + * boot time. + * + * The below assumes resizable VPR by default. If the + * firmwares sets up fixed VPR, it is responsible for + * adding the missing "reg" property, removing any of + * the unused properties, as well as adding a unit- + * address matching the "reg" property. + */ + + /* fixed VPR */ + /* + reg = <0x0 0x0 0x0 0x0>; + no-map; + */ + + /* resizable VPR */ + size = <0x0 0x70000000>; + alignment = <0x0 0x100000>; + reusable; + }; + }; + bus@0 { compatible = "simple-bus";