Messages in this thread | | | Date | Mon, 5 Dec 2022 22:15:16 +0300 | Subject | Re: [PATCH 5/5] powerpc: dts: remove label = "cpu" from DSA dt-binding | From | Arınç ÜNAL <> |
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On 4.12.2022 21:59, Vladimir Oltean wrote: > Hi Pali, > > On Fri, Dec 02, 2022 at 08:35:52PM +0100, Pali Rohár wrote: >> On Thursday 01 December 2022 17:44:00 Rob Herring wrote: >>> On Thu, Dec 01, 2022 at 06:39:02PM +0100, Pali Rohár wrote: >>>> I was told by Marek (CCed) that DSA port connected to CPU should have >>>> label "cpu" and not "cpu<number>". Modern way for specifying CPU port is >>>> by defining reference to network device, which there is already (&enet1 >>>> and &enet0). So that change just "fixed" incorrect naming cpu0 and cpu1. >>>> >>>> So probably linux kernel does not need label = "cpu" in DTS anymore. But >>>> this is not the reason to remove this property. Linux kernel does not >>>> use lot of other nodes and properties too... Device tree should describe >>>> hardware and not its usage in Linux. "label" property is valid in device >>>> tree and it exactly describes what or where is this node connected. And >>>> it may be used for other systems. >>>> >>>> So I do not see a point in removing "label" properties from turris1x.dts >>>> file, nor from any other dts file. >>> >>> Well, it seems like a bit of an abuse of 'label' to me. 'label' should >>> be aligned with a sticker or other identifier identifying something to a >>> human. Software should never care what the value of 'label' is. >> >> But it already does. "label" property is used for setting (initial) >> network interface name for DSA drivers. And you can try to call e.g. >> git grep '"cpu"' net/dsa drivers/net/dsa to see that cpu is still >> present on some dsa places (probably relict or backward compatibility >> before eth reference). > > Can you try to eliminate the word "probably" from the information you > transmit and be specific about when did the DSA binding parse or require > the 'label = "cpu"' property for CPU ports in any way?
As Jonas (on CC) pointed out, I only see this being used in the swconfig b53 driver which uses the label to identify the cpu port.
https://git.openwrt.org/?p=openwrt/openwrt.git;a=blob;f=target/linux/generic/files/drivers/net/phy/b53/b53_common.c;h=87d731ec3e2a868dc8389f554b1dc9ab42c30be2;hb=HEAD#l1508
Maybe this got into DSA dt-bindings unchecked before it was decided to move forward with DSA instead of swconfig on Linux.
Arınç
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