linux-kernel - Re: [RESEND PATCH v3 1/2] dmaengine: vdma: Add 64 bit addressing support to the driver

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Date:	Wed, 6 Apr 2016 08:42:26 -0700
From:	Vinod Koul <vinod.koul@...el.com>
To:	Kedareswara rao Appana <appana.durga.rao@...inx.com>
Cc:	robh+dt@...nel.org, pawel.moll@....com, mark.rutland@....com,
	ijc+devicetree@...lion.org.uk, galak@...eaurora.org,
	michal.simek@...inx.com, soren.brinkmann@...inx.com,
	dan.j.williams@...el.com, appanad@...inx.com,
	moritz.fischer@...us.com, laurent.pinchart@...asonboard.com,
	luis@...ethencourt.com, svemula@...inx.com, anirudh@...inx.com,
	devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, dmaengine@...r.kernel.org,
	Anurag Kumar Vulisha <anuragku@...inx.com>
Subject: Re: [RESEND PATCH v3 1/2] dmaengine: vdma: Add 64 bit addressing
 support to the driver

On Wed, Apr 06, 2016 at 10:38:08AM +0530, Kedareswara rao Appana wrote:
> This VDMA  is a soft ip, which can be programmed to support
> 32 bit addressing or greater than 32 bit addressing.
> 
> When the VDMA ip is configured for 32 bit address space
> the buffer address is specified by a single register
> (0x5C for MM2S and 0xAC for S2MM channel).
> 
> When the  VDMA core is configured for an address space greater
> than 32 then each buffer address is specified by a combination of
> two registers.
> 
> The first register specifies the LSB 32 bits of address,
> while the next register specifies the MSB 32 bits of address.
> 
> For example, 5Ch will specify the LSB 32 bits while 60h will
> specify the MSB 32 bits of the first start address.
> So we need to program two registers at a time.
> 
> This patch adds the 64 bit addressing support to the vdma driver.

Applied both, thanks

-- 
~Vinod