[PATCH v7 2/7] mailbox: arm_mhu: add driver for ARM MHU controller
sudeep.holla at arm.com
Thu Mar 26 04:43:21 PDT 2015
On 04/03/15 11:01, Vincent Yang wrote:
> From: Jassi Brar <jaswinder.singh at linaro.org>
> Add driver for the ARM Primecell Message-Handling-Unit(MHU) controller.
> Signed-off-by: Jassi Brar <jaswinder.singh at linaro.org>
> Signed-off-by: Andy Green <andy.green at linaro.org>
> Signed-off-by: Vincent Yang <vincent.yang at socionext.com>
> Signed-off-by: Tetsuya Nuriya <nuriya.tetsuya at socionext.com>
> .../devicetree/bindings/mailbox/arm-mhu.txt | 43 +++++
> drivers/mailbox/Kconfig | 9 +
> drivers/mailbox/Makefile | 2 +
> drivers/mailbox/arm_mhu.c | 195 +++++++++++++++++++++
> 4 files changed, 249 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/mailbox/arm-mhu.txt
> create mode 100644 drivers/mailbox/arm_mhu.c
> diff --git a/Documentation/devicetree/bindings/mailbox/arm-mhu.txt b/Documentation/devicetree/bindings/mailbox/arm-mhu.txt
> new file mode 100644
> index 0000000..4971f03
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mailbox/arm-mhu.txt
> @@ -0,0 +1,43 @@
> +ARM MHU Mailbox Driver
> +The ARM's Message-Handling-Unit (MHU) is a mailbox controller that has
> +3 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.
> +The last channel is specified to be a 'Secure' resource, hence can't be
> +used by Linux running NS.
> +Mailbox Device Node:
> +Required properties:
> +- compatible: Shall be "arm,mhu" & "arm,primecell"
> +- 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 3 links of MHU.
I tried using this driver and found that AMBA driver expects apb_clk
without which probe fails. Though your example have it, it's not
explicit from the binding. Also AMBA binding expects the primecell id in
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