On Thu, Jul 28, 2016 at 08:49:16PM +0200, Maxime Ripard wrote:

On Thu, Jul 28, 2016 at 03:40:31PM +0200, LABBE Corentin wrote:

quoted

On Thu, Jul 21, 2016 at 09:55:19AM +0200, Maxime Ripard wrote:

quoted

Hi,

On Wed, Jul 20, 2016 at 10:03:18AM +0200, LABBE Corentin wrote:

quoted

This patch adds documentation for Device-Tree bindings for the
Allwinner sun8i-emac driver.

Signed-off-by: LABBE Corentin <redacted>
---
 .../bindings/net/allwinner,sun8i-emac.txt          | 65 ++++++++++++++++++++++
 1 file changed, 65 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/net/allwinner,sun8i-emac.txt

diff --git a/Documentation/devicetree/bindings/net/allwinner,sun8i-emac.txt b/Documentation/devicetree/bindings/net/allwinner,sun8i-emac.txt
new file mode 100644
index 0000000..4bf4e53
--- /dev/null
+++ b/Documentation/devicetree/bindings/net/allwinner,sun8i-emac.txt

@@ -0,0 +1,65 @@
+* Allwinner sun8i EMAC ethernet controller
+
+Required properties:
+- compatible: "allwinner,sun8i-a83t-emac", "allwinner,sun8i-h3-emac",
+		or "allwinner,sun50i-a64-emac"
+- reg: address and length of the register sets for the device.
+- reg-names: should be "emac" and "syscon", matching the register sets

Blindly mapping a register of some other device on the SoC doesn't
look very reasonable.

As we discuss after this mail on IRC, this register is dedicated to EMAC.

I don't think we did. It's still right in the middle of some other
hardware block register space. You actually have a syscon driver to do
just that, why not use it?

I will try with syscon driver

quoted

quoted

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+See ethernet.txt in the same directory for generic bindings for ethernet
+controllers.
+
+The device node referenced by "phy" or "phy-handle" should be a child node
+of this node. See phy.txt for the generic PHY bindings.
+
+Optional properties:
+- phy-supply: phandle to a regulator if the PHY needs one
+- phy-io-supply: phandle to a regulator if the PHY needs a another one for I/O.
+		 This is sometimes found with RGMII PHYs, which use a second
+		 regulator for the lower I/O voltage.
+- allwinner,tx-delay: The setting of the TX clock delay chain
+- allwinner,rx-delay: The setting of the RX clock delay chain

In which unit? What is the default value?

The unit is unknown to me, but I have added a comment for the
default and acceptable range value.

That's unfortunate. We'll see how the DT maintainers feel about that.

I have searched for txdelay in Documentation, and found a few driver that give the units (us/ps).
But in that case, the value in ps/us must be found in a table indexed by the Xxdelay value.
So the settings seems always a raw number, and for sun8i-emac nothing in user manual could help to find what each value is/related to.

So the good value is either found by "try and test" or "copy the value found in fex file".

Regards

LABBE Corentin