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When building the CVNAS driver as an external module against upstream Linux kernels, there are some downstream fuse APIs that are not found. To fix building CVNAS for upstream kernels ... 1. Use the device-tree machine compatibility string instead of the downstream fuse function tegra_get_chip_id(). 2. For the functions tegra_platform_is_silicon() and tegra_platform_is_sim() add implementations in a fuse-helper.h that always assume that platform is silicon and not a simulator. Note this assumption is only applied to upstream kernels and downstream kernel still use the downstream implementation. Long term we need to revisit this. 3. Copy the downstream implementation for function tegra_get_sku_id() to the fuse-helper.h so that this is available for upstream kernels. The functions implemented in fuse-helper.h are only used if the compiler flag CONFIG_TEGRA_FUSE_UPSTREAM is defined. Bug 3459526 Change-Id: I5bbd08ac2560c236f932606ce5ad0e73dc71205a Signed-off-by: Jon Hunter <jonathanh@nvidia.com> Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvidia/+/2650491 Reviewed-by: Sachin Nikam <snikam@nvidia.com> Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/2894844 Reviewed-by: Laxman Dewangan <ldewangan@nvidia.com> GVS: Gerrit_Virtual_Submit <buildbot_gerritrpt@nvidia.com> Tested-by: Laxman Dewangan <ldewangan@nvidia.com>