On Mon, 12 Nov 2012 23:54:40 +0100, Per Förlin <[email protected]> wrote: > On 11/12/2012 04:20 PM, Grant Likely wrote: > > On Mon, Nov 12, 2012 at 2:59 PM, Per Forlin <[email protected]> > > wrote: > >> Add support to extract device name from device tree blob. > >> If the property "dev-name" is set in the DTS this name will > >> be used when creating the device. > >> The auxdata_lookup has precedence and will override > >> the "dev-name" property. > > > > Using a 'dev-name' property has the same problem that the 'cell-index' > > properties have in that it is encoding part of the global namespace > > local to the node and it becomes easy to create collisions. Instead of > > this check to see if one of the properties in /aliases points to the > > node and use that for the name. > > > > g. > > > Thanks Grant for your feedback, > > Extract from exynos5250.dtsi: > ----------- > aliases { > spi0 = &spi_0; > spi1 = &spi_1; > spi2 = &spi_2; > }; > > spi_0: spi@12d20000 { > ... > }; > > spi_1: spi@12d30000 { > ... > }; > > spi_2: spi@12d40000 { > ... > }; > --------------- > > Alias refers to the device node. The device node is not aware of the alias. > > How to get a device name from the aliases. > 1. Traverse all aliases for each device node (time consuming if there are > many aliases) > 2. Make a new function of_alias_get_name(), today there is only > of_alias_get_id() > 3. The functionality of setting device_name based on alias name needs to be > optional because one may want to use aliases without changing the name of the > device. > All this is feasible but perhaps not optimal. > > I don't really see how come name space is a big issue in this case. The name > space of "dev-name" is local to the device node. A child device node can use > the same dev-name as the parent (unless I'm mistaken which happens quite > often). Introducing yet another property name pollutes the name space of the > device node. Still I think the pros are stronger than the cons. > > Do you still prefer to use the name of the Alias? Could you please elaborate > a bit more how this can be done in practice? > I would agree with you if there was a reference from the device node to the > alias.
Oh, I see what you're trying to do. As Lee pointed out you're trying to make the Linux internal way of matching up clocks and regulators happy. That is very much a Linux-kernel internal thing and should be solved in the kernel. Trying to solve it with fixed names in the device tree will cause problems down the road. I though you were wanting to have logical names for the devices that make sense to the user which is how aliases is used now. So, no, don't do this. g.
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