[PATCH 1/3] dt-bindings: Add document of Rockchip mailbox
From: jassisinghbrar@gmail.com (Jassi Brar)
Date: 2015-10-06 10:34:55
Also in:
linux-devicetree, linux-rockchip, lkml
On Mon, Sep 14, 2015 at 4:36 PM, Caesar Wang [off-list ref] wrote:
quoted hunk ↗ jump to hunk
This add the necessary binding documentation for mailbox found on RK3368 SoC. Signed-off-by: Caesar Wang <redacted> --- .../bindings/mailbox/rockchip-mailbox.txt | 33 ++++++++++++++++++++++ 1 file changed, 33 insertions(+) create mode 100644 Documentation/devicetree/bindings/mailbox/rockchip-mailbox.txtdiff --git a/Documentation/devicetree/bindings/mailbox/rockchip-mailbox.txt b/Documentation/devicetree/bindings/mailbox/rockchip-mailbox.txt new file mode 100644 index 0000000..b9b4768 --- /dev/null +++ b/Documentation/devicetree/bindings/mailbox/rockchip-mailbox.txt@@ -0,0 +1,33 @@ +Rockchip mailbox + +The Rockchip mailbox is used by the Rockchip CPU cores to communicate +requests to MCU processor. + +Refer to ./mailbox.txt for generic information about mailbox device-tree +bindings. + +Required properties: + + - compatible: should be one of the following. + - "rockchip,rk3368-mbox" for rk3368 + - reg: physical base address of the controller and length of memory mapped + region. + physical base address of the share buffer and length of memory mapped + region.
Please make shared-sram a property of user drivers. Location and size of shared-memory is a platform property, mailbox controller doesn't need sram to function. For example, protocol on some platform, with this controller, may be trivial enough to not need a shared sram... say only 32-bits wide requests and responses which can be passed via mailbox registers directly. mbox_client.tx_prepare() is where the user driver sets up the shared-memory.