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6c12873824
The original PolarFire SoC mailbox devicetree bindings described the control/status and interrupt registers as standalone reg regions of the mailbox device. This was incorrect, as these registers are shared system control blocks and should instead be modeled as syscon devices. Linux has since corrected this by introducing syscon-based bindings for the MPFS mailbox and updating the mailbox driver to access the control and interrupt registers via syscon/regmap. U-Boot, however, continued to expect the legacy binding, causing mailbox access to fail when using Linux-aligned devicetrees. Update the U-Boot MPFS mailbox driver to support the new syscon-based bindings by resolving the control and sysreg syscon nodes and accessing the registers through regmap. Support for the legacy mailbox binding is retained for backwards compatibility with existing firmware-provided devicetrees. This brings the U-Boot mailbox driver in line with the corrected hardware description and matches the behavior of the Linux mailbox driver. Signed-off-by: Jamie Gibbons <jamie.gibbons@microchip.com> Reviewed-by: Conor Dooley <conor.dooley@microchip.com>