linux-kernel - Re: [PATCH 1/3] dt/bindings: arm-pl330: add description of arm,pl330-periph-burst

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Message-ID: <0df0ab4f-0032-6487-2c30-b1ccd7d9ae62@metafoo.de>
Date:	Tue, 9 Aug 2016 10:39:43 +0200
From:	Lars-Peter Clausen <lars@...afoo.de>
To:	Shawn Lin <shawn.lin@...k-chips.com>,
	Vinod Koul <vinod.koul@...el.com>
Cc:	Rob Herring <robh+dt@...nel.org>,
	Huibin Hong <huibin.hong@...k-chips.com>,
	Xing Zheng <zhengxing@...k-chips.com>,
	devicetree@...r.kernel.org, dianders@...omium.org,
	briannorris@...omium.org, Caesar Wang <wxt@...k-chips.com>,
	dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-rockchip@...ts.infradead.org
Subject: Re: [PATCH 1/3] dt/bindings: arm-pl330: add description of
 arm,pl330-periph-burst

On 08/05/2016 09:25 AM, Shawn Lin wrote:
> Hi Vinod,
> 
> 在 2016/8/5 11:34, Vinod Koul 写道:
>> On Fri, Aug 05, 2016 at 10:53:20AM +0800, Shawn Lin wrote:
>>> This patch adds the "arm,pl330-periph-burst" for arm-pl330 to
>>> support busrt mode.
>>
>> why should this be DT property. Only reason I can think of if some hw
>> versions support this and some won't.
> 
> yes, if we want to support burst mode, both of the master(pl330) and
> client(several peripherals) should implement it, otherwise it will
> be broken when enabling.

As you said, it is up to the consumer peripheral whether it supports BURST,
SINGLE or both. So this is a per client property, but you specify this as a
a global property on the producer side.