^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) ======================================================================
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) Device tree bindings for Aspeed AST2400/AST2500 PCI-to-AHB Bridge Control Driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) ======================================================================
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) The bridge is available on platforms with the VGA enabled on the Aspeed device.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) In this case, the host has access to a 64KiB window into all of the BMC's
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) memory. The BMC can disable this bridge. If the bridge is enabled, the host
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) has read access to all the regions of memory, however the host only has read
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) and write access depending on a register controlled by the BMC.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) Required properties:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) ===================
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) - compatible: must be one of:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) - "aspeed,ast2400-p2a-ctrl"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) - "aspeed,ast2500-p2a-ctrl"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) Optional properties:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) ===================
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) - reg: A hint for the memory regions associated with the P2A controller
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) - memory-region: A phandle to a reserved_memory region to be used for the PCI
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) to AHB mapping
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) The p2a-control node should be the child of a syscon node with the required
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) property:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) - compatible : Should be one of the following:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) "aspeed,ast2400-scu", "syscon", "simple-mfd"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) "aspeed,ast2500-scu", "syscon", "simple-mfd"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) Example
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) ===================
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) g4 Example
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) ----------
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) syscon: scu@1e6e2000 {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) compatible = "aspeed,ast2400-scu", "syscon", "simple-mfd";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) reg = <0x1e6e2000 0x1a8>;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) p2a: p2a-control {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) compatible = "aspeed,ast2400-p2a-ctrl";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) memory-region = <&reserved_memory>;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) };