Merge tag 'mailbox-v6.20' of git://git.kernel.org/pub/scm/linux/kernel/git/jassibrar/mailbox

Pull mailbox updates from Jassi Brar:
 "Platform and core updates

  PCC:
   - Updates to transmission and interrupt handling, including dynamic
     txdone configuration, ->last_tx_done() wiring, and SHMEM
     initialization fixes. Reverted previous shared buffer patch

  MediaTek
   - Introduce mtk-vcp-mailbox driver and bindings for MT8196 VCP
   - Expand mtk-cmdq for MT8196 with GCE virtualization, mminfra_offset,
     and instruction generation data

  Spreadtrum (SPRD)
   - Add Mailbox Revision 2 support and UMS9230 bindings
   - Fix unhandled interrupt masking and TX done delivery flags

  Microchip
   - Add pic64gx compatibility to MPFS
   - Fix out-of-bounds access and smatch warnings in mchp-ipc-sbi

  Core & Misc Platform Updates
   - Prevent out-of-bounds access in fw_mbox_index_xlate()
   - Add bindings for Qualcomm CPUCP (Kaanapali)
   - Simplify mtk-cmdq and zynqmp-ipi with scoped OF child iterators
   - Consolidate various minor fixes, dead code removal, and typo
     corrections across Broadcom, NXP, Samsung, Xilinx, ARM, and core
     headers"

* tag 'mailbox-v6.20' of git://git.kernel.org/pub/scm/linux/kernel/git/jassibrar/mailbox: (34 commits)
  mailbox: sprd: mask interrupts that are not handled
  mailbox: sprd: add support for mailbox revision 2
  mailbox: sprd: clear delivery flag before handling TX done
  dt-bindings: mailbox: sprd: add compatible for UMS9230
  mailbox: bcm-ferxrm-mailbox: Use default primary handler
  mailbox: Remove mailbox_client.h from controller drivers
  mailbox: zynqmp-ipi: Simplify with scoped for each OF child loop
  mailbox: mtk-cmdq: Simplify with scoped for each OF child loop
  dt-bindings: mailbox: xlnx,zynqmp-ipi-mailbox: Document msg region requirement
  mailbox: Improve RISCV_SBI_MPXY_MBOX guidance
  mailbox: mchp-ipc-sbi: fix uninitialized symbol and other smatch warnings
  mailbox: arm_mhuv3: fix typo in comment
  mailbox: cix: fix typo in error message
  mailbox: imx: Skip the suspend flag for i.MX7ULP
  mailbox: exynos: drop unneeded runtime pointer (pclk)
  mailbox: pcc: Remove spurious IRQF_ONESHOT usage
  mailbox: mtk-cmdq: Add driver data to support for MT8196
  mailbox: mtk-cmdq: Add mminfra_offset configuration for DRAM transaction
  mailbox: mtk-cmdq: Add GCE hardware virtualization configuration
  mailbox: mtk-cmdq: Add cmdq private data to cmdq_pkt for generating instruction
  ...

2 files changed, 32 insertions, 29 deletions

diff --git a/include/acpi/pcc.h b/include/acpi/pcc.h
index 9af3b502f839..840bfc95bae3 100644
--- a/include/acpi/pcc.h
+++ b/include/acpi/pcc.h
@@ -17,35 +17,6 @@ struct pcc_mbox_chan {
 	u32 latency;
 	u32 max_access_rate;
 	u16 min_turnaround_time;
-
-	/* Set to true to indicate that the mailbox should manage
-	 * writing the dat to the shared buffer. This differs from
-	 * the case where the drivesr are writing to the buffer and
-	 * using send_data only to  ring the doorbell.  If this flag
-	 * is set, then the void * data parameter of send_data must
-	 * point to a kernel-memory buffer formatted in accordance with
-	 * the PCC specification.
-	 *
-	 * The active buffer management will include reading the
-	 * notify_on_completion flag, and will then
-	 * call mbox_chan_txdone when the acknowledgment interrupt is
-	 * received.
-	 */
-	bool manage_writes;
-
-	/* Optional callback that allows the driver
-	 * to allocate the memory used for receiving
-	 * messages.  The return value is the location
-	 * inside the buffer where the mailbox should write the data.
-	 */
-	void *(*rx_alloc)(struct mbox_client *cl,  int size);
-};
-
-struct pcc_header {
-	u32 signature;
-	u32 flags;
-	u32 length;
-	u32 command;
 };
 
 /* Generic Communications Channel Shared Memory Region */
diff --git a/include/linux/mailbox/mtk-vcp-mailbox.h b/include/linux/mailbox/mtk-vcp-mailbox.h
new file mode 100644
index 000000000000..16e59d6780a7
--- /dev/null
+++ b/include/linux/mailbox/mtk-vcp-mailbox.h
@@ -0,0 +1,32 @@
+/* SPDX-License-Identifier: (GPL-2.0 OR MIT) */
+/*
+ * Copyright (c) 2025 MediaTek Inc.
+ */
+
+#ifndef __MTK_VCP_MAILBOX_H__
+#define __MTK_VCP_MAILBOX_H__
+
+#define MTK_VCP_MBOX_SLOT_MAX_SIZE	0x100 /* mbox max slot size */
+
+/**
+ * struct mtk_ipi_info - mailbox message info for mtk-vcp-mailbox
+ * @msg: The share buffer between IPC and mailbox driver
+ * @len: Message length
+ * @id: This is for identification purposes and not actually used
+ *	by the mailbox hardware.
+ * @index: The signal number of the mailbox message.
+ * @slot_ofs: Data slot offset.
+ * @irq_status: Captures incoming signals for the RX path.
+ *
+ * It is used between IPC with mailbox driver.
+ */
+struct mtk_ipi_info {
+	void *msg;
+	u32 len;
+	u32 id;
+	u32 index;
+	u32 slot_ofs;
+	u32 irq_status;
+};
+
+#endif