>-----Original Message----- >From: Arnd Bergmann [mailto:arnd@xxxxxxxx] >Sent: Wednesday, September 24, 2014 11:55 PM >To: Lu Jingchang-B35083 >Cc: Guo Shawn-R65073; mark.rutland@xxxxxxx; linux-arm- >kernel@xxxxxxxxxxxxxxxxxxx; devicetree@xxxxxxxxxxxxxxx; Lu Chen-B46807; Fu >Chao-B44548 >Subject: Re: [PATCHv4 3/6] ARM: dts: Add initial LS1021A TWR board dts >support > >On Wednesday 24 September 2014 11:00:34 Jingchang Lu wrote: >> >> We also do the phy-handle fixup on our PowerPC platform based on the >> aliases, and so I adopt the same way to make these fixup consistent >between SoCs. >> And the u-boot fdt fixup code base on the aliases has been upstreamed, >> so may we keep this aliases unchanged? > >I don't see a strong reason to change it, it just seemed strange to me. > >> BTW, find a node by alias is easily, could you give me some clue on >> finding a node by a label directly, Thanks. > >I haven't used libfdt in this way myself, so I don't know how it would be >done. However, the idea is that the labels in dts files end up as ELF >symbols in the dtb, so you can look them up by following the ELF headers. > > Arnd Libfdt doesn't provide way to find a node by label. Label is just a shortcut to a full absolute path, it's useful in device tree source reference, but is hard to find a label after build to dtb. Aliases just provide the way to save a full absolute path in properties like label, but they can be find in dtb after build so that fixup on dtb can find a node efficiently. So I think the aliases for the phy nodes is also reasonable. Many others boards also use labels for various dts nodes. Thanks. Best Regards, Jingchang ��.n��������+%������w��{.n����z�{��ܨ}���Ơz�j:+v�����w����ޙ��&�)ߡ�a����z�ޗ���ݢj��w�f
