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

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Date:	Thu, 22 Oct 2015 10:07:00 +0800
From:	Caesar Wang <caesar.upstream@...il.com>
To:	Jassi Brar <jassisinghbrar@...il.com>
Cc:	Caesar Wang <wxt@...k-chips.com>,
	Mark Rutland <mark.rutland@....com>,
	Devicetree List <devicetree@...r.kernel.org>,
	Heiko Stübner <heiko@...ech.de>,
	Pawel Moll <pawel.moll@....com>,
	"ijc+devicetree@...lion.org.uk" <ijc+devicetree@...lion.org.uk>,
	frank.wang@...k-chips.com,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-rockchip@...ts.infradead.org,
	Rob Herring <robh+dt@...nel.org>,
	Kumar Gala <galak@...eaurora.org>,
	"olof@...om.net" <olof@...om.net>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 1/3] dt-bindings: Add document of Rockchip mailbox

Hello Jassi,

Sorry for delay reply.
在 2015年10月06日 18:34, Jassi Brar 写道:
> On Mon, Sep 14, 2015 at 4:36 PM, 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
>> +       region.
> Please make shared-sram a property of user drivers.

As Rob points out,
maybe, don't we need also define it in user drivers.
As the SRAM binding (misc/sram.txt) had defined.

I just make the SCPI protocol client driver to work for mailbox.
>
> 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.
>
> _______________________________________________
> Linux-rockchip mailing list
> Linux-rockchip@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-rockchip

-- 
Thanks,
Caesar

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