On Wed, Aug 5, 2015 at 12:25 AM, Scott Wood <scottw...@freescale.com> wrote: > On Wed, 2015-08-05 at 00:22 +0300, Ran Shalit wrote: >> On Tue, Aug 4, 2015 at 11:31 PM, Scott Wood <scottw...@freescale.com> wrote: >> > On Tue, 2015-08-04 at 23:26 +0300, Ran Shalit wrote: >> > > On Tue, Aug 4, 2015 at 9:54 PM, Scott Wood <scottw...@freescale.com> >> > > wrote: >> > > > On Tue, 2015-08-04 at 18:29 +0300, Ran Shalit wrote: >> > > > > Hello, >> > > > > >> > > > > I would please like to ask if describing flash nor used with GPMC, >> > > > > whould be done as described in: >> > > > > https://www.kernel.org/doc/Documentation/devicetree/bindings/mtd/gpmc-nor.txt >> > > > > It is described in the above link as "TI's GPMC", so I'm not sure if >> > > > > it is relevent for powerpc too. >> > > > >> > > > That binding is for TI GPMC. >> > > > >> > > > Are you saying you have some PPC chip that has a flash controller >> > > > called >> > > > GPMC? >> > > > >> > > > -Scott >> > > > >> > > >> > > Hi Scott, >> > > >> > > Thanks, I've worked with TI's chips, so I now understand that I made >> > > here some confusion... >> > > It is GPCM , not GPMC, my mistake. >> > > We already configured it in u-boot, but on doing read/write from >> > > kernel it doesn not work. >> > > It seems that for the linux to use the correct driver, we need to >> > > define the nor in the device tree. >> > > Is there any example how to define nor GPCM in device tree ? Is it >> > > possible not to override the existing GPCM configuration ? >> > >> > Pretty much all of the mpc8xxx/qoriq device trees have GPCM NOR defined. >> > See >> > Documentation/devicetree/bindings/powerpc/fsl/lbc.txt and examples such as >> > arch/powerpc/boot/dts/p4080ds.dts (part of the lbc node is in >> > arch/powerpc/boot/dts/fsl/p4080si-post.dtsi). >> > >> > Linux will not change the GPCM configuration. >> > >> > -Scott >> > >> >> On more thing, if I may. >> The localbus is also connected to nvram & cpld. >> I've noticed that read/write works well, even though I didn't define >> anything in device tree. >> Is there any reasom to add these devices into device tree, or can we >> use the cpld and nvram without the definition in device tree ? > > I don't know what you're doing in your kernel to access devices that aren't > in the device tree. You should add the devices to the device tree, and have > the kernel use it rather than hardcoded info. > > -Scott > Hi,
Yes I understand. But It is worse noting that I have no localbus entry in the device tree. Yes, The nvram, cpld which are both connected to device tree, seems to work without any issues. Thanks, Ran _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
