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Date: Sun, 20 Sep 2020 11:57:22 +0200 From: Ansuel Smith <ansuelsmth@...il.com> To: Miquel Raynal <miquel.raynal@...tlin.com> Cc: Ansuel Smith <ansuelsmth@...il.com>, Richard Weinberger <richard@....at>, Vignesh Raghavendra <vigneshr@...com>, Rob Herring <robh+dt@...nel.org>, "David S. Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>, Andrew Lunn <andrew@...n.ch>, Heiner Kallweit <hkallweit1@...il.com>, Russell King <linux@...linux.org.uk>, Frank Rowand <frowand.list@...il.com>, Boris Brezillon <bbrezillon@...nel.org>, linux-mtd@...ts.infradead.org, devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, netdev@...r.kernel.org Subject: [PATCH v3 4/4] dt-bindings: net: Document use of mac-address-increment Two new bindings are now supported by the of_net driver to increase (or decrease) a mac-address. This can be very useful in case where the system extract the mac-address for the device from a dedicated partition and have a generic mac-address that needs to be incremented based on the device number. - mac-address-increment-byte is used to tell what byte must be incremented (if not set the last byte is increased) - mac-address-increment is used to tell how much to increment of the extracted mac-address decided byte. Signed-off-by: Ansuel Smith <ansuelsmth@...il.com> --- .../bindings/net/ethernet-controller.yaml | 21 +++++++++++++++++++ 1 file changed, 21 insertions(+) diff --git a/Documentation/devicetree/bindings/net/ethernet-controller.yaml b/Documentation/devicetree/bindings/net/ethernet-controller.yaml index fa2baca8c726..8174f64e79bd 100644 --- a/Documentation/devicetree/bindings/net/ethernet-controller.yaml +++ b/Documentation/devicetree/bindings/net/ethernet-controller.yaml @@ -32,6 +32,27 @@ properties: - minItems: 6 maxItems: 6 + mac-address-increment: + description: + The MAC address can optionally be increased (or decreased using + negative values) from the original value read (from a nvmem cell + for example). This can be used if the mac is read from a dedicated + partition and must be increased based on the number of device + present in the system. The increment will not overflow/underflow to + the other bytes if it's over 255 or 0. + (example 00:01:02:03:04:ff + 1 == 00:01:02:03:04:00) + minimum: -255 + maximum: 255 + + mac-address-increment-byte: + description: + If 'mac-address-increment' is defined, this will tell what byte of + the mac-address will be increased. If 'mac-address-increment' is + not defined, this option will do nothing. + default: 5 + minimum: 3 + maximum: 5 + max-frame-size: $ref: /schemas/types.yaml#definitions/uint32 description: -- 2.27.0
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