From mboxrd@z Thu Jan 1 00:00:00 1970 From: Emil Medve Subject: Re: [PATCH v3 1/4] dt/bindings: Introduce the FSL QorIQ DPAA BMan Date: Fri, 7 Nov 2014 03:38:10 -0600 Message-ID: <545C9302.50703@Freescale.com> References: <1415200734-6978-1-git-send-email-Emilian.Medve@Freescale.com> <1415200734-6978-2-git-send-email-Emilian.Medve@Freescale.com> <1415310579.23458.402.camel@snotra.buserror.net> <545C754C.9080700@Freescale.com> <1415345665.23458.428.camel@snotra.buserror.net> <545C7F77.90200@Freescale.com> <1415348363.23458.432.camel@snotra.buserror.net> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1415348363.23458.432.camel@snotra.buserror.net> Sender: linux-doc-owner@vger.kernel.org To: Scott Wood Cc: galak@kernel.crashing.org, corbet@lwn.net, robh+dt@kernel.org, ijc+devicetree@hellion.org.uk, galak@codeaurora.org, pawel.moll@arm.com, mark.rutland@arm.com, grant.likely@linaro.org, Geoff.Thorpe@Freescale.com, linuxppc-dev@ozlabs.org, devicetree@vger.kernel.org, linux-doc@vger.kernel.org List-Id: devicetree@vger.kernel.org Hello Scott, On 11/07/2014 02:19 AM, Scott Wood wrote: > On Fri, 2014-11-07 at 02:14 -0600, Emil Medve wrote: >> Hello Scott, >> >> >> On 11/07/2014 01:34 AM, Scott Wood wrote: >>> On Fri, 2014-11-07 at 01:31 -0600, Emil Medve wrote: >>>> Hello Scott, >>>> >>>> >>>> On 11/06/2014 03:49 PM, Scott Wood wrote: >>>>> On Wed, 2014-11-05 at 09:18 -0600, Emil Medve wrote: >>>>>> +Devices connected to a BMan instance via Direct Connect Portals (DCP) must link >>>>>> +to the respective BMan instance >>>>>> + >>>>>> +- fsl,bman >>>>>> + Usage: Required >>>>>> + Value type: >>>>>> + Description: List of phandle and DCP index pairs, to the BMan instance >>>>>> + to which this device is connected via the DCP >>>>> >>>>> Does software need the DCP index (though for QMan there do seem to be a >>>>> few registers associated with each DCP)? Where can I find that info in >>>>> the manual? >>>> >>>> The DCP index helps describe the topology of the devices connected to >>>> the B/QMan. One might be tempted to use some address to reference said >>>> DCP, unfortunately the pertinent registers/bits for said DCP(s) are not >>>> into a compact region. Look at the CCSR memory map for B/QMan >>>> >>>> In the QMan case things are marginally better. For each hardware portal >>>> there are a handful of (vaguely named *DCx*, *DCPx* or *DCP*) registers >>>> (configuration, performance monitoring and debugging). However, still >>>> registers and bits spread here and there >>>> >>>> In the BMan case things are a bit worse as the registers names are less >>>> friendly and still spread around >>>> >>>> Do you need specific names/offsets? >>> >>> My question about the manual wasn't rhetorical -- I tried to find this >>> information and couldn't. >> >> I get that. As I said, the registers/bits are spread around in the CCSR >> space of each block and not named excessively friendly. As such I hinted >> for some search patterns to make it easier to find them. In order to >> progress the review I'm willing to prepare a list. Just let me know > > Could you point me to the section of the manual where this information > is -- friendly or otherwise? I saw the QMan direct connect portal > registers. I didn't see how to tell which in DCPi_xxx goes with > which device. For QMan look into section '6.3.10 Direct Connect Portals (DCPs)'. The BMan DCP assignment is the same Cheers,