[PATCH u-boot-marvell] arm64: dts: armada-3720-espressobin: fix COMPHY nodes

Marek Behún marek.behun at nic.cz
Wed Aug 19 11:57:25 CEST 2020

This commit fixes initialization of COMPHY on EspressoBin.

Commit 22f418935be4 ("phy: marvell: a3700: Use comphy_mux on Armada
37xx.") introduced usage of comphy_mux on Armada 37xx comphy driver.
The lanes are defined in comphy_a3700.c as described in functional
specification, that is:
  lane 0 is SGMII1 or USB3
  lane 1 is PCIe or SGMII0
  lane 2 is SATA or USB3

But the DTS for EspressoBin configures PCIe on lane 0 and USB3 on
lane 1, which is wrong in the sense of the specification and doesn't
work with the comphy_mux code, which is 2 years now (the aardvark driver
causes synchronous abort in U-Boot).

It worked till the above mentioned commit, because the code for powering
up PCIe PHY doesn't work with lane number at all, and the code for
powering up USB3 PHY works differently only if USB3 is on lane 2, ie.
the check goes like:
  if (lane == 2)
    something else
so it does not differentiate between lanes 0 and 1.

In the future I shall post patches that remove the comphy_a3700 driver
and add comphy driver which uses calls to ATF, like Linux' driver does.
This will have the advantage of same DTS bindings as Linux', but till
this is done, we need this patch.

Signed-off-by: Marek Behún <marek.behun at nic.cz>
Tested-by: Pali Rohár <pali at kernel.org>
Cc: Stefan Roese <sr at denx.de>
 arch/arm/dts/armada-3720-espressobin.dts | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/arch/arm/dts/armada-3720-espressobin.dts b/arch/arm/dts/armada-3720-espressobin.dts
index 84e2c2adba..50381e979e 100644
--- a/arch/arm/dts/armada-3720-espressobin.dts
+++ b/arch/arm/dts/armada-3720-espressobin.dts
@@ -72,13 +72,13 @@
 &comphy {
 	max-lanes = <3>;
 	phy0 {
-		phy-type = <PHY_TYPE_PEX0>;
-		phy-speed = <PHY_SPEED_2_5G>;
+		phy-type = <PHY_TYPE_USB3_HOST0>;
+		phy-speed = <PHY_SPEED_5G>;
 	phy1 {
-		phy-type = <PHY_TYPE_USB3_HOST0>;
-		phy-speed = <PHY_SPEED_5G>;
+		phy-type = <PHY_TYPE_PEX0>;
+		phy-speed = <PHY_SPEED_2_5G>;
 	phy2 {

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