u-boot.git/drivers/mailbox, branch v2026.07

mailbox: mpfs-mbox: support new syscon based devicetree configuration

2026-06-08T21:38:25Z

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 Reviewed-by: Conor Dooley

mailbox: mpfs-mbox: fix driver bug and cleanup

2026-06-08T21:38:25Z

Remove an unused and invalid struct mbox_chan pointer from the private data and fix incorrect memory handling in the probe path, where the private data structure was allocated. This change corrects a functional bugs and cleans up the driver without altering its behavior. Fixes: 111e9bf6a5ac ("mailbox: add PolarFire SoC mailbox driver") Signed-off-by: Jamie Gibbons Reviewed-by: Conor Dooley

mailbox: mpfs-mbox: fix Driver Model private data handling

2026-06-08T21:38:25Z

The MPFS mailbox driver declares priv_auto but also allocates a second private data structure in the legacy probe path and overwrites the device’s private pointer using dev_set_priv(). This results in leaking the auto-allocated private data and replacing the driver’s private state mid-probe, which is incorrect usage of the U-Boot Driver Model and can lead to undefined behavior. Remove the redundant allocation and dev_set_priv() call so that the driver consistently uses the auto-allocated private data provided by U-Boot. Fixes: 111e9bf6a5ac ("mailbox: add PolarFire SoC mailbox driver") Signed-off-by: Jamie Gibbons Reviewed-by: Conor Dooley

mailbox: mpfs-mbox: fix MMIO mapping calculation

2026-06-08T21:38:25Z

Correct the MMIO mapping size calculation, which previously relied on an invalid start/end subtraction. This change corrects a functional bug and cleans up the driver without altering its behavior. Fixes: 111e9bf6a5ac ("mailbox: add PolarFire SoC mailbox driver") Signed-off-by: Jamie Gibbons Reviewed-by: Conor Dooley

treewide: Clean up DECLARE_GLOBAL_DATA_PTR usage

2026-02-17T19:50:22Z

Remove DECLARE_GLOBAL_DATA_PTR from files where gd is not used, and drop the unnecessary inclusion of asm/global_data.h. Headers should be included directly by the files that need them, rather than indirectly via global_data.h. Reviewed-by: Patrice Chotard #STMicroelectronics boards and STM32MP1 ram test driver Tested-by: Anshul Dalal #TI boards Acked-by: Yao Zi #TH1520 Signed-off-by: Peng Fan

dm: core: Default to using DEVRES outside of xPL

2026-01-09T15:08:14Z

The devm alloc functions that we have may follow the Linux kernel model where allocations are (almost always) automatically free()'d. However, quite often we don't enable, in full U-Boot, the tracking and free()'ing functionality. This in turn leads to memory leaks because the driver author expects that since the functions have the same name as in the Linux Kernel they have the same behavior. In turn we then get functionally correct commits such as commit 00e1fed93c8c ("firmware: ti_sci: Fix memory leaks in devm_ti_sci_get_of_resource") that manually add these calls. Rather than manually tracking allocations and implementing free()s, rework things so that we follow expectations by enabling the DEVRES functionality (outside of xPL phases). This turns DEVRES from a prompted symbol to a symbol that must be select'd, and we now remove our non-managed alloc/free functions from outside of xPL builds. Reviewed-by: Michael Trimarchi Signed-off-by: Tom Rini

mailbox: renesas: Add Renesas MFIS Multifunctional Interface mailbox driver

2025-12-02T23:17:15Z

Add support for the Renesas MFIS mailbox, which provides an interface between the different CPU Cores, such as AP System Core domain and the Realtime Core domain, SCP Core domain and AP System Core domain or Realtime Core domain and AP System Core domain or Realtime Core domain. Signed-off-by: Tuyen Dang Signed-off-by: Marek Vasut # Update the driver [Marek: Rename the driver to renesas-mfis, simplify the driver. Always use only one TX channel and no RX channel, drop all unnecessary code. Perform 1ms delay in send callback which is perfectly fine to do in U-Boot which does RX polling]

mailbox: Allow operation without .recv callback

2025-11-07T16:40:42Z

Some shared memory mailboxes may have empty receive operation, because the data are polled by upper layers directly from the shared memory region, and there is no completion interrupt or bit of any sort. Allow empty .recv callback, and if the .recv callback is empty, exit from mbox_recv() right away, because any polling for completion here would be meaningless. Signed-off-by: Marek Vasut Reviewed-by: Alice Guo

mailbox: zynqmp-ipi: Mark zynqmp_ipi_dest_mbox_ops as const

2025-08-26T05:30:09Z

Operations are not changing that's why mark them as const which ensure that structure will be moved from .data section to .rodata section. Also mark them as static because they are not used out of this file. Signed-off-by: Michal Simek Link: https://lore.kernel.org/r/b7e5dc8841f6e904a7365f2ed45248609c007ddd.1753444878.git.michal.simek@amd.com

mailbox: zynqmp: Fix off by 1 errors

2025-08-25T14:20:47Z

Use resource_size to correctly calculate the size to pass to devm_ioremap and avoid the off by 1 errors previously present. This issue was found by Smatch. Signed-off-by: Andrew Goodbody Link: https://lore.kernel.org/r/20250728-zynqmp-ipi-v1-1-b2bd144a9521@linaro.org Signed-off-by: Michal Simek