linux-kernel - Re: [PATCH RFC] dt-bindings: nvmem: u-boot, env: add any-name MAC cells compatible

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Message-ID: <7e2f36fa-c201-4c8b-a485-077f65a9a0e1@linaro.org>
Date: Mon, 25 Dec 2023 14:11:03 +0100
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Rafał Miłecki <zajec5@...il.com>,
 Simon Glass <sjg@...omium.org>
Cc: Rob Herring <robh+dt@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>,
 Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
 devicetree@...r.kernel.org, linux-mtd@...ts.infradead.org,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
 u-boot@...ts.denx.de, Rafał Miłecki <rafal@...ecki.pl>
Subject: Re: [PATCH RFC] dt-bindings: nvmem: u-boot, env: add any-name MAC
 cells compatible

On 18/12/2023 23:02, Rafał Miłecki wrote:
> On 14.12.2023 22:27, Simon Glass wrote:
>> On Thu, 14 Dec 2023 at 08:36, Rafał Miłecki <zajec5@...il.com> wrote:
>>>
>>> From: Rafał Miłecki <rafal@...ecki.pl>
>>>
>>> So far we had a property for "ethaddr" NVMEM cell containing base
>>> Ethernet MAC address. The problem is vendors often pick non-standard
>>> names for storing MAC(s) (other than "ethaddr"). A few names were
>>> noticed over years:
>>> 1. "wanaddr" (Edimax, ELECOM, EnGenius, I-O DATA, Sitecom)
>>> 2. "et1macaddr" (ASUS)
>>> 3. "eth1addr" (Buffalo)
>>> 4. "athaddr" (EnGenius)
>>> 5. "baseMAC" (Netgear)
>>> 6. "mac" (Netgear)
>>> 7. "mac_addr" (Moxa)
>>> and more ("HW_LAN_MAC", "HW_WAN_MAC", "INIC_MAC_ADDR", "LAN_MAC_ADDR",
>>> "RADIOADDR0", "RADIOADDR1", "WAN_MAC_ADDR", "lan1_mac_addr", "wanmac",
>>> "wmac1", "wmac2").
>>>
>>> It doesn't make sense to add property for every possible MAC cell name.
>>> Instead allow specifying cells with "mac" compatible.
>>>
>>> Signed-off-by: Rafał Miłecki <rafal@...ecki.pl>
>>> ---
>>> List of devices and their U-Boot MAC variables:
>>> alphanetworks,asl56026) wanmac
>>> asus,rt-ac65p) et1macaddr
>>> asus,rt-ac85p) et1macaddr
>>> belkin,f9k1109v1) HW_WAN_MAC + HW_LAN_MAC
>>> buffalo,ls220de) eth1addr
>>> buffalo,ls421de) eth1addr
>>> checkpoint,l-50) lan1_mac_addr
>>> dovado,tiny-ac) INIC_MAC_ADDR
>>> dovado,tiny-ac) LAN_MAC_ADDR + WAN_MAC_ADDR
>>> edimax,ra21s) wanaddr
>>> edimax,rg21s) wanaddr
>>> elecom,wrc-2533ghbk-i) wanaddr
>>> elecom,wrc-2533ghbk2-t) wanaddr
>>> engenius,ecb1200) athaddr
>>> engenius,ecb1750) athaddr
>>> engenius,epg5000) wanaddr
>>> engenius,epg600) wanaddr
>>> engenius,esr1200) wanaddr
>>> engenius,esr1750) wanaddr
>>> engenius,esr600) wanaddr
>>> engenius,esr600h) wanaddr
>>> engenius,esr900) wanaddr
>>> enterasys,ws-ap3705i) RADIOADDR0 + RADIOADDR1
>>> iodata,wn-ac1167dgr) wanaddr
>>> iodata,wn-ac1167gr) wanaddr
>>> iodata,wn-ac1600dgr) wanaddr
>>> iodata,wn-ac1600dgr2) wanaddr
>>> iodata,wn-ac733gr3) wanaddr
>>> iodata,wn-ag300dgr) wanaddr
>>> iodata,wnpr2600g) wanaddr
>>> moxa,awk-1137c) mac_addr
>>> netgear,wax220) mac
>>> netgear,wndap620) baseMAC
>>> netgear,wndap660) baseMAC
>>> ocedo,panda) wmac1 + wmac2
>>> sitecom,wlr-7100) wanaddr
>>> sitecom,wlr-8100) wanaddr
>>>
>>>   .../devicetree/bindings/nvmem/u-boot,env.yaml | 33 +++++++++++++++++++
>>>   1 file changed, 33 insertions(+)
>>>
>>
>> Are these upstream U-Boots, or just vendor forks?
> 
> I guess most of those devices don't have upstream U-Boot support. Please

We do not document properties used in all possible projects, like vendor
forks. Only upstream U-Boot matters.

> note that while upstreaming vendors changes would be great in most cases
> it doesn't happen. Most vendors sadly don't care and most end users
> don't have enough time for that. In practice we often stick with vendor
> provided bootloader to flash and boot self build Linux system (like
> OpenWrt).
> 
> I'm not sure if/how does it help with this PATCH but please note that
> upstream U-Boot code also supports few extra variables.
> 
> There is generic eth_env_get_enetaddr_by_index() that supports variables
> like "<%s><%d>addr" and "<%s>addr". Right now it's used only for
> "eth<%d>addr" and "ethaddr" so that mostly limits us to "ethaddr",
> "eth1addr", "eth2addr" and "eth3addr".
> 
>  From some rare cases: there are also "usbnet_devaddr" and "wolpassword".
> 
> So given that U-Boot oficially supports at least 6 env variables for
> MAC and there are many used with custom U-Boots and firmwares this
> binding would help a lot.

Please limit this to upstream U-Boot. Drop all custom and firmware ones.

Then, just fix upstream U-Boot to have only one property...

Best regards,
Krzysztof