linux-kernel - Re: [PATCH v2 1/3] dt-bindings: mailbox: Introduce Hi3660 controller binding

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Date:   Fri, 27 Oct 2017 09:38:44 -0500
From:   Rob Herring <robh@...nel.org>
To:     Kaihua Zhong <zhongkaihua@...wei.com>
Cc:     mark.rutland@....com, xuwei5@...ilicon.com,
        catalin.marinas@....com, will.deacon@....com,
        jassisinghbrar@...il.com, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        guodong.xu@...aro.org, haojian.zhuang@...aro.org,
        suzhuangluan@...ilicon.com, xuezhiliang@...ilicon.com,
        kevin.wangtao@...ilicon.com
Subject: Re: [PATCH v2 1/3] dt-bindings: mailbox: Introduce Hi3660 controller
 binding

On Fri, Oct 27, 2017 at 02:15:02PM +0800, Kaihua Zhong wrote:
> From: Leo Yan <leo.yan@...aro.org>
> 
> Introduce a binding for the Hi3660 mailbox controller, the mailbox is
> used within application processor (AP), communication processor (CP),
> HIFI and MCU, etc.
> 
> Cc: John Stultz <john.stultz@...aro.org>
> Cc: Guodong Xu <guodong.xu@...aro.org>
> Cc: Haojian Zhuang <haojian.zhuang@...aro.org>
> Cc: Niranjan Yadla <nyadla@...ence.com>
> Cc: Raj Pawate <pawateb@...ence.com>
> Signed-off-by: Leo Yan <leo.yan@...aro.org>
> ---
>  .../bindings/mailbox/hisilicon,hi3660-mailbox.txt  | 52 ++++++++++++++++++++++
>  1 file changed, 52 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/mailbox/hisilicon,hi3660-mailbox.txt
> 
> diff --git a/Documentation/devicetree/bindings/mailbox/hisilicon,hi3660-mailbox.txt b/Documentation/devicetree/bindings/mailbox/hisilicon,hi3660-mailbox.txt
> new file mode 100644
> index 0000000..8a8d7e1
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mailbox/hisilicon,hi3660-mailbox.txt
> @@ -0,0 +1,52 @@
> +Hisilicon Hi3660 Mailbox Driver

Bindings are for h/w, not drivers.

> +
> +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@...6b000 {
> +	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 {

clock@...6b500

> +	compatible = "hisilicon,hi3660-stub-clk";
> +	reg = <0x0 0xe896b500 0x0 0x0100>;
> +	#clock-cells = <1>;
> +	mbox-names = "mbox-tx";

Don't need -names when there is only one. Plus "mbox-" part is 
redundant.

> +	mboxes = <&mailbox 13 3 0>;
> +};
> -- 
> 1.9.1
>