From mboxrd@z Thu Jan 1 00:00:00 1970 From: sshtylyov@mvista.com (Sergei Shtylyov) Date: Tue, 04 Jan 2011 21:50:43 +0300 Subject: [PATCH v5 1/3] ARM: add CPPI 4.1 DMA support In-Reply-To: <20110104184244.GC2647@legolas.emea.dhcp.ti.com> References: <20110103163447.GB2911@n2100.arm.linux.org.uk> <19F8576C6E063C45BE387C64729E739404BD3F2C4D@dbde02.ent.ti.com> <4D220246.5020303@mvista.com> <19F8576C6E063C45BE387C64729E739404BD3F2C58@dbde02.ent.ti.com> <20110103204416.GA2240@legolas.emea.dhcp.ti.com> <4D231B5F.7030607@mvista.com> <1294149984.1822.9.camel@eowin> <1294152988.1822.12.camel@eowin> <20110104184244.GC2647@legolas.emea.dhcp.ti.com> Message-ID: <4D236C03.9040707@mvista.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Hello. Felipe Balbi wrote: > On Tue, Jan 04, 2011 at 11:41:05PM +0800, Ming Lei wrote: >> OMAP GPIOs have many usages or use cases, so we can use gpiolib >> to simplify access to GPIOs. If GPIOs has only one usage or use case, >> it is not necessary to access GPIOs by gpiolib. >> Now this kind of DMA controllers are only used by MUSB or only for >> MUSB, so it doesn't matter to access them by dmaengine or not. > Not entirely true. TUSB uses OMAP system DMA and AFAICT CPPI is used > also for ethernet. Yes, but the CPPI registers are not compatible between MUSB and EMAC, only the descriptors are, AFAIK. WBR, Sergei