Merge tag 'mailbox-v4.17' of git://git.linaro.org/landing-teams/working/fujitsu/integration

Pull mailbox updates from Jassi Brar:

 - New Hi3660 mailbox driver

 - Fix TEGRA Kconfig warning

 - Broadcom: use dma_pool_zalloc instead of dma_pool_alloc+memset

* tag 'mailbox-v4.17' of git://git.linaro.org/landing-teams/working/fujitsu/integration:
  mailbox: Add support for Hi3660 mailbox
  dt-bindings: mailbox: Introduce Hi3660 controller binding
  mailbox: tegra: relax TEGRA_HSP_MBOX Kconfig dependencies
  maillbox: bcm-flexrm-mailbox: Use dma_pool_zalloc()

Documentation/devicetree/bindings/mailbox/hisilicon,hi3660-mailbox.txt

@@ -0,0 +1,51 @@
+Hisilicon Hi3660 Mailbox Controller
+
+Hisilicon Hi3660 mailbox controller supports up to 32 channels.  Messages
+are passed between processors, including application & communication
+processors, MCU, HIFI, etc.  Each channel is unidirectional and accessed
+by using MMIO registers; it supports maximum to 8 words message.
+
+Controller
+----------
+
+Required properties:
+- compatible:		: Shall be "hisilicon,hi3660-mbox"
+- reg:			: Offset and length of the device's register set
+- #mbox-cells:		: Must be 3
+			  <&phandle channel dst_irq ack_irq>
+			    phandle	: Label name of controller
+			    channel	: Channel number
+			    dst_irq	: Remote interrupt vector
+			    ack_irq	: Local interrupt vector
+
+- interrupts:		: Contains the two IRQ lines for mailbox.
+
+Example:
+
+mailbox: mailbox@e896b000 {
+	compatible = "hisilicon,hi3660-mbox";
+	reg = <0x0 0xe896b000 0x0 0x1000>;
+	interrupts = <0x0 0xc0 0x4>,
+		     <0x0 0xc1 0x4>;
+	#mbox-cells = <3>;
+};
+
+Client
+------
+
+Required properties:
+- compatible		: See the client docs
+- mboxes		: Standard property to specify a Mailbox (See ./mailbox.txt)
+			  Cells must match 'mbox-cells' (See Controller docs above)
+
+Optional properties
+- mbox-names		: Name given to channels seen in the 'mboxes' property.
+
+Example:
+
+stub_clock: stub_clock@e896b500 {
+	compatible = "hisilicon,hi3660-stub-clk";
+	reg = <0x0 0xe896b500 0x0 0x0100>;
+	#clock-cells = <1>;
+	mboxes = <&mailbox 13 3 0>;
+};