linux-kernel - Re: [PATCH v6 7/8] dmaengine: add a driver for Intel integrated DMA 64-bit

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Message-ID: <20150728084347.GB29916@localhost>
Date:	Tue, 28 Jul 2015 14:13:47 +0530
From:	Vinod Koul <vinod.koul@...el.com>
To:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:	linux-acpi@...r.kernel.org, linux-pm@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Lee Jones <lee.jones@...aro.org>,
	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	linux-kernel@...r.kernel.org, dmaengine@...r.kernel.org,
	Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
	Jarkko Nikula <jarkko.nikula@...ux.intel.com>,
	"Wysocki, Rafael J" <rafael.j.wysocki@...el.com>,
	mturquette@...libre.com, sboyd@...eaurora.org
Subject: Re: [PATCH v6 7/8] dmaengine: add a driver for Intel integrated DMA
 64-bit

On Mon, Jul 27, 2015 at 06:04:02PM +0300, Andy Shevchenko wrote:
> Intel integrated DMA (iDMA) 64-bit is a specific IP that is used as a part of
> LPSS devices such as HSUART or SPI. The iDMA IP is attached for private
> usage on each host controller independently.
> 
> While it has similarities with Synopsys DesignWare DMA, the following
> distinctions doesn't allow to use the existing driver:
> - 64-bit mode with corresponding changes in Hardware Linked List data structure
> - many slight differences in the channel registers
> 
> Moreover this driver is based on the DMA virtual channels framework that helps
> to make the driver cleaner and easy to understand.
Acked-by: Vinod Koul <vinod.koul@...el.com>

-- 
~Vinod

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