From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tony Lindgren Subject: Re: [RFC v02 03/15] dmaengine: core: Introduce new, universal API to request a channel Date: Wed, 2 Dec 2015 07:00:05 -0800 Message-ID: <20151202150005.GB23396@atomide.com> References: <1448891145-10766-1-git-send-email-peter.ujfalusi@ti.com> <1448891145-10766-4-git-send-email-peter.ujfalusi@ti.com> <20151130155142.GZ2517@atomide.com> <565D56A0.2090204@ti.com> <20151201170031.GT23396@atomide.com> <565EC14A.6020502@ti.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <565EC14A.6020502-l0cyMroinI0@public.gmane.org> Sender: linux-spi-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Peter Ujfalusi Cc: vinod.koul-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org, arnd-r2nGTMty4D4@public.gmane.org, andy.shevchenko-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org, linux-mmc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, nsekhar-l0cyMroinI0@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-spi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, dmaengine-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-omap-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org List-Id: linux-mmc@vger.kernel.org * Peter Ujfalusi [151202 02:01]: > On 12/01/2015 07:00 PM, Tony Lindgren wrote: > >> I see. The dm81xx basically am33xx/am43xx? > > > > Yeah similar to am33xx with different clocks and with a bunch of accelerators. > > > >> Actually I would prefer to use the dmaengine's event router framework and we > >> do have support for the am33xx/am43xx type of crossbar already implemented. > >> I'm going to resend the DTS series for am33xx/am43xx to convert them to use > >> the new DT bindings along with the dma event router support: > >> https://www.mail-archive.com/linux-omap%40vger.kernel.org/msg120828.html > > > > OK yes a dmaengine event router works too when available. Good to see > > them as separate driver instances now :) Are only the dts changes missing > > now? > > > > FYI, when we have separate interconnect driver instances, we don't want to > > and cannot tweak registers outside the interconnect instance because of them > > being in separate clock and/or power domains :p > > What does this mean in practice? We can not touch these registers? The DMA > crossbar is a separate driver from the eDMA driver. Seem like it should not affect DMA crossbar as it's a separate driver. What I meant is we need a separate driver for clocks, pinctrl, regulators, PHY, crossbar or syscon to use the SCM registers from drivers sitting on a L4 interonnect. > > In any case, it seems there's no harm using pinctrl for evtmux on dm81xx > > until the event router is available. It's currently only needed on the > > t410 emmc that I'm aware of :) > > The AM33xx/AM43xx DMA crossbar support is in 4.4 already: > 42dbdcc6bf96 dmaengine: ti-dma-crossbar: Add support for crossbar on AM33xx/AM43xx OK great. Tony -- To unsubscribe from this list: send the line "unsubscribe linux-spi" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html