From mboxrd@z Thu Jan 1 00:00:00 1970 From: Neil Armstrong Subject: [PATCH 2/3] dt-bindings: mailbox: Add Amlogic Meson MHU Bindings Date: Tue, 9 Aug 2016 10:52:16 +0200 Message-ID: <1470732737-18391-3-git-send-email-narmstrong@baylibre.com> References: <1470732737-18391-1-git-send-email-narmstrong@baylibre.com> Return-path: In-Reply-To: <1470732737-18391-1-git-send-email-narmstrong@baylibre.com> Sender: linux-kernel-owner@vger.kernel.org To: linux-kernel@vger.kernel.org, linux-amlogic@lists.infradead.org, linux-arm-kernel@lists.infradead.org, jassisinghbrar@gmail.com, devicetree@vger.kernel.org Cc: Neil Armstrong List-Id: devicetree@vger.kernel.org Signed-off-by: Neil Armstrong --- .../devicetree/bindings/mailbox/meson-mhu.txt | 33 ++++++++++++++++++++++ 1 file changed, 33 insertions(+) create mode 100644 Documentation/devicetree/bindings/mailbox/meson-mhu.txt diff --git a/Documentation/devicetree/bindings/mailbox/meson-mhu.txt b/Documentation/devicetree/bindings/mailbox/meson-mhu.txt new file mode 100644 index 0000000..4a80b44 --- /dev/null +++ b/Documentation/devicetree/bindings/mailbox/meson-mhu.txt @@ -0,0 +1,33 @@ +Amlogic Meson MHU Mailbox Driver +================================ + +The Amlogic's Meson SoCs Message-Handling-Unit (MHU) is a mailbox controller +that has 2 independent channels/links to communicate with remote processor(s). +MHU links are hardwired on a platform. A link raises interrupt for any +received data. However, there is no specified way of knowing if the sent +data has been read by the remote. This driver assumes the sender polls +STAT register and the remote clears it after having read the data. + +Mailbox Device Node: +==================== + +Required properties: +-------------------- +- compatible: Shall be "amlogic,meson-gxbb-mhu" +- reg: Contains the mailbox register address range (base + address and length) +- #mbox-cells Shall be 1 - the index of the channel needed. +- interrupts: Contains the interrupt information corresponding to + each of the 2 links of MHU. + +Example: +-------- + + mailbox: mailbox@c883c400 { + #mbox-cells = <1>; + compatible = "amlogic,meson-gxbb-mhu"; + reg = <0 0xc883c400 0 0x4c>; + interrupts = <0 209 IRQ_TYPE_EDGE_RISING>, + <0 210 IRQ_TYPE_EDGE_RISING>; + #mbox-cells = <1>; + }; -- 2.7.0