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

[Rafał Miłecki]

From: Rafał Miłecki <rafal at milecki.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 at milecki.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(+)

diff --git a/Documentation/devicetree/bindings/nvmem/u-boot,env.yaml b/Documentation/devicetree/bindings/nvmem/u-boot,env.yaml
index 0006f022d0af..68214b96f5c9 100644
--- a/Documentation/devicetree/bindings/nvmem/u-boot,env.yaml
+++ b/Documentation/devicetree/bindings/nvmem/u-boot,env.yaml
@@ -67,6 +67,34 @@ properties:
         description: The first argument is a MAC address offset.
         const: 1
 
+patternProperties:
+  ".*":
+    allOf:
+      - if:
+          type: object
+        then:
+          properties:
+            compatible:
+              enum:
+                - mac
+      - if:
+          properties:
+            compatible:
+              contains:
+                const: mac
+        then:
+          description:
+            Ethernet interfaces base MAC address.
+
+          properties:
+            compatible: true
+
+            "#nvmem-cell-cells":
+              description: The first argument is a MAC address offset.
+              const: 1
+
+          additionalProperties: false
+
 additionalProperties: false
 
 examples:
@@ -90,6 +118,11 @@ examples:
             mac: ethaddr {
                 #nvmem-cell-cells = <1>;
             };
+
+            wanaddr {
+                compatible = "mac";
+                #nvmem-cell-cells = <1>;
+            };
         };
     };
   - |
-- 
2.35.3