From mboxrd@z Thu Jan 1 00:00:00 1970 From: Scott Wood Subject: Re: [PATCH v3 1/4] dt/bindings: Introduce the FSL QorIQ DPAA BMan Date: Fri, 7 Nov 2014 10:49:54 -0600 Message-ID: <1415378994.3805.5.camel@snotra.buserror.net> 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> <545C9302.50703@Freescale.com> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <545C9302.50703@Freescale.com> Sender: linux-doc-owner@vger.kernel.org To: Emil Medve 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 On Fri, 2014-11-07 at 03:38 -0600, Emil Medve wrote: > 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 Thanks, I'm not sure how I missed that. -Scott