On 08/14/2013 10:48 AM, dinguyen@xxxxxxxxxx wrote: > From: Dinh Nguyen <dinguyen@xxxxxxxxxx> > > Add bindings for SD/MMC for SOCFPGA. > diff --git a/Documentation/devicetree/bindings/mmc/socfpga-dw-mshc.txt b/Documentation/devicetree/bindings/mmc/socfpga-dw-mshc.txt > +* altr,sysmgr: Should be the phandle to the system_mgr node. As this is where > + this where the register that controls the CIU clock phases > + reside. On the surface, this binding series seems OK, but I do have a question: how is the sysmgr phandle used? I assume there's some register in this syscon device that resets or enables or otherwise controls this MSHC module. How does the code know which register it is? The phandle in the altr,sysmgr property would usually be followed by a/some cell(s) that encode this information, so that the MSHC driver doesn't have to know anything about the layout of the syscon registers, and so the sysconf driver doesn't have to know anything about the identity of the MSHC client device. That way, the MSHC driver will work fine if a HW designer has dropped the MSHC IP block into a completely different SoC with a different syscon register layout. -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
