Message-id: <003a01cf42ef$57c32ee0$07498ca0$@samsung.com>
Date:	Tue, 18 Mar 2014 14:16:28 -0700
From:	Byungho An <bh74.an@...sung.com>
To:	'Florian Fainelli' <f.fainelli@...il.com>
Cc:	'netdev' <netdev@...r.kernel.org>,
	linux-samsung-soc@...r.kernel.org, devicetree@...r.kernel.org,
	'David Miller' <davem@...emloft.net>, siva.kallam@...sung.com,
	ilho215.lee@...sung.com, ks.giri@...sung.com,
	vipul.pandya@...sung.com
Subject: RE: [PATCH V5 1/8] sxgbe: Add device-tree binding support document

Florian Fainelli <f.fainelli@...il.com> wrote :
> 2014-03-18 11:19 GMT-07:00 Byungho An <bh74.an@...sung.com>:
> > From: Siva Reddy <siva.kallam@...sung.com>
> >
> > This patch adds binding document for SXGBE ethernet driver via device-tree.
> >
> > Signed-off-by: Siva Reddy Kallam <siva.kallam@...sung.com>
> > Signed-off-by: Byungho An <bh74.an@...sung.com>
> > ---
> >  .../devicetree/bindings/net/samsung-sxgbe.txt      |   52 ++++++++++++++++++++
> >  1 file changed, 52 insertions(+)
> >  create mode 100644
> > Documentation/devicetree/bindings/net/samsung-sxgbe.txt
> >
> > diff --git a/Documentation/devicetree/bindings/net/samsung-sxgbe.txt
> > b/Documentation/devicetree/bindings/net/samsung-sxgbe.txt
> > new file mode 100644
> > index 0000000..340eff6
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/net/samsung-sxgbe.txt
> > @@ -0,0 +1,52 @@
> > +* Samsung 10G Ethernet driver (SXGBE)
> > +
> > +Required properties:
> > +- compatible: Should be "samsung,sxgbe-v2.0a"
> > +- reg: Address and length of the register set for the device
> > +- interrupt-parent: Should be the phandle for the interrupt
> > +controller
> > +  that services interrupts for this device
> > +- interrupts: Should contain the SXGBE interrupts
> > +  These interrupts are ordered by fixed and follows variable
> > +  trasmit DMA interrupts, receive DMA interrupts and lpi interrupt.
> > +  index 0 - this is fixed common interrupt of SXGBE and it is always
> > +  available.
> > +  index 1 to 25 - 8 variable trasmit interrupts, variable 16 receive
> > +interrupts
> > +  and 1 optional lpi interrupt.
> > +- phy-mode: String, operation mode of the PHY interface.
> 
> You should reference
> Documentation/devicetree/bindings/net/ethernet.txt which is more thorough about what this is about.
OK.

> 
> > +  Supported values are: "xaui", "gmii".
> 
> xaui is not documented in
> Documentation/devicetree/bindings/net/ethernet.txt, nor is it supported in include/linux/phy.h and drivers/of/of_net.c, that should
> be part of the patchset.
OK.  It will be changed to xgmii and xaui support patch will be posted later.

> 
> > +- samsung,pbl: Integer, Programmable Burst Length.
> > +  Supported values are 1, 2, 4, 8, 16, or 32.
> > +- samsung,burst-map: Integer, Program the possible bursts supported
> > +by sxgbe
> > +  This is an interger and represents allowable DMA bursts when fixed burst.
> > +  Allowable range is 0x00-0x3F. This field is valid only when fixed
> > +burst is
> > +  enabled, otherwise ignored.
> > +- samsung,adv-addr-mode: Boolean, Program the DMA to use Enhanced address mode.
> > +- samsung,force-thresh-dma-mode: Boolean, Force DMA to use the
> > +threshold mode
> > +  for both tx and rx
> > +- samsung,force-sf-dma-mode: Boolean, Force DMA to use the Store and
> > +Forward
> > +  mode for both tx and rx. This flag is ignored if force-thresh-dma-mode is set.
> > +- samsung,phy-addr: Integer, Address of the PHY attached with SXGBE.
> 
> Please don't use a custom property for that, use a phy-handle which points to an ePAPR compliant Ethernet PHY device tree node as
> described in Documentation/devicetree/bindings/net/phy.txt.
OK.

> 
> > +
> > +Optional properties:
> > +- mac-address: 6 bytes, mac address
> 
> Did you intend to use 'local-mac-address'. 'mac-address' is described by ePAPR as:
> 
> "Specifies the MAC address that was last used by the boot program.
> This property should be
> used in cases where the MAC address assigned to the device by the boot program is different from the local-mac-address property.
> This property shall be used only if the value differs from local-mac-address property value."
> 
> Does your bootloader really do something which falls into that description? If not, use 'local-mac-address'.
In my case, bootloader assigns mac address so mac-address is suitable according to Documentation/devicetree/binings/net/ethernet.txt.

> 
> > +
> > +Example:
> > +
> > +       aliases {
> > +               ethernet0 = <&sxgbe0>;
> > +       };
> > +
> > +       sxgbe0: ethernet@...40000 {
> > +               compatible = "samsung,sxgbe-v2.0a";
> > +               reg = <0 0x1a040000 0 0x10000>;
> > +               interrupt-parent = <&gic>;
> > +               interrupts = <0 209 4>, <0 185 4>, <0 186 4>, <0 187 4>,
> > +                            <0 188 4>, <0 189 4>, <0 190 4>, <0 191 4>,
> > +                            <0 192 4>, <0 193 4>, <0 194 4>, <0 195 4>,
> > +                            <0 196 4>, <0 197 4>, <0 198 4>, <0 199 4>,
> > +                            <0 200 4>, <0 201 4>, <0 202 4>, <0 203 4>,
> > +                            <0 204 4>, <0 205 4>, <0 206 4>, <0 207 4>,
> > +                            <0 208 4>, <0 210 4>;
> > +               mac-address = [000000000000]; /* Filled in by U-Boot
> > + */
> 
> The preferred way to format this is:
>                     mac-address = [ 00 00 00 00 00 00 ]; even better is something directly usable in case people copy/paste this example such as
> 00 11 22 33 44 55.
OK.

> 
> > +               phy-mode = "xaui";
> 
> Your example is lacking a corresponding Ethernet PHY address/node.
OK. Will be updated.

> --
> Florian
> --
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