linux-kernel - Re: [PATCH 1/3] dt-bindings: Add document of Rockchip mailbox

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Message-ID: <CAL_Jsq+36CqbUnccU_LKgmeswoPgr0vBzh4PLM4nOtsCAYE0SA@mail.gmail.com>
Date:	Tue, 6 Oct 2015 09:50:16 -0500
From:	Rob Herring <robh@...nel.org>
To:	Caesar Wang <wxt@...k-chips.com>
Cc:	Heiko Stübner <heiko@...ech.de>,
	Jaswinder Singh <jassisinghbrar@...il.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Kumar Gala <galak@...eaurora.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	linux-rockchip@...ts.infradead.org,
	Pawel Moll <pawel.moll@....com>,
	Will Deacon <will.deacon@....com>,
	Mark Rutland <mark.rutland@....com>,
	Olof Johansson <olof@...om.net>,
	Catalin Marinas <catalin.marinas@....com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>, frank.wang@...k-chips.com
Subject: Re: [PATCH 1/3] dt-bindings: Add document of Rockchip mailbox

On Mon, Sep 14, 2015 at 6:06 AM, Caesar Wang <wxt@...k-chips.com> wrote:
> This add the necessary binding documentation for mailbox
> found on RK3368 SoC.
>
> Signed-off-by: Caesar Wang <wxt@...k-chips.com>
> ---
>
>  .../bindings/mailbox/rockchip-mailbox.txt          | 33 ++++++++++++++++++++++
>  1 file changed, 33 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/mailbox/rockchip-mailbox.txt
>
> diff --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

s/share/shared/

> +       region.
> + - interrupts: The interrupt number to the cpu. The interrupt specifier format
> +       depends on the interrupt controller.

Need to specify the value of #mbox-cells.

> +
> +Example:
> +--------
> +
> +/* RK3368 */
> +mbox: mbox@...b0000 {
> +       compatible = "rockchip,rk3368-mailbox";
> +       reg = <0x0 0xff6b0000 0x0 0x1000>,
> +             <0x0 0xff8cf000 0x0 0x1000>; /* the end 4k of sram */

If this is just onchip SRAM usable for anything, then use the SRAM
binding (misc/sram.txt). It has provisions for defining the use.

> +       interrupts = <GIC_SPI 146 IRQ_TYPE_LEVEL_HIGH>,
> +                    <GIC_SPI 147 IRQ_TYPE_LEVEL_HIGH>,
> +                    <GIC_SPI 148 IRQ_TYPE_LEVEL_HIGH>,
> +                    <GIC_SPI 149 IRQ_TYPE_LEVEL_HIGH>;
> +       #mbox-cells = <1>;
> +};
> --
> 1.9.1
>
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