opensbi.git/lib/utils/fdt/objects.mk, branch master

lib: utils: Initialize miscellaneous drivers in one pass

2025-02-12T16:09:25Z

For driver subsystems that are not tightly integrated into the OpenSBI init sequence, it is not important that the drivers are initialized in any particular order. By putting all of these drivers in one array, they can all be initialized with a single pass through the devicetree. This saves about 10 ms of boot time on HiFive Unmatched. Signed-off-by: Samuel Holland Reviewed-by: Anup Patel

lib: utils/fdt: Add helpers for generic driver initialization

2024-11-28T11:43:05Z

Currently, each driver subsystem contains its own code for matching drivers against the platform's devicetree blob. This bloats firmware size because the several FDT scanning loops are almost exact copies of each other, and is confusing because the loops do have some subtle differences. Furthermore, the existing match algorithm is inefficient: it scans the FDT structure separately for each driver in the list. A faster algorithm scans the FDT blob only once, matching all drivers in the list for each `compatible` property seen. Add new helpers implementing this faster algorithm. Since they must iterate through the list of drivers, the driver structure cannot be opaque. However, since the driver list is an array of pointers, the `struct fdt_driver` can be embedded in a subsystem-specific driver structure if needed. These three helpers cover all existing use cases for driver initialization within OpenSBI. An additional benefit of centralized driver initialization is the consistent use of fdt_node_is_enabled(). Signed-off-by: Samuel Holland Reviewed-by: Anup Patel

lib: utils/fdt: Use kconfig for enabling/disabling

2022-08-08T04:04:08Z

We update FDT support makefile to use kconfig for enabling/disabling. To avoid compilation errors, we also enable FDT for each platform. Signed-off-by: Anup Patel Tested-by: Andrew Jones Acked-by: Atish Patra Tested-by: Atish Patra

utils: fdt: Add fdt helper functions to parse PMU DT nodes

2021-07-11T04:57:57Z

The PMU DT node bindings are defined in docs/pmu_support.md Add few fdt helper functions to parse the DT node and update the event-counter mapping tables. Reviewed-by: Anup Patel Signed-off-by: Atish Patra

lib: utils: Add helper routines to populate domains from FDT

2020-12-04T15:40:44Z

We add various helper routines to populate domains, iterate domains, iterate domain memregions, and parse HART to domain assignment from the FDT. These helper routines can be used by platform support code and FDT fixup code. Signed-off-by: Anup Patel Reviewed-by: Atish Patra

lib: utils: Move fdt fixup helper routines to a different file

2020-03-24T08:00:32Z

FDT helper file contain both fdt fixup and parsing functions. Split the fixup related functions to a separate file for a better code organization. Signed-off-by: Atish Patra Reviewed-by: Anup Patel

lib: utils: Add a fdt_reserved_memory_fixup() helper

2020-03-18T03:49:44Z

Add a helper routine to insert a child node of the reserved memory node in the device tree that describes the protected memory region done by OpenSBI via PMP. Signed-off-by: Bin Meng Reviewed-by: Atish Patra