Re: [PATCH] ARM: dts: stm32: lxa-mc1: Fix kernel warning about PHY delays

From: Alexandre Torgue
Date: Fri Aug 28 2020 - 05:13:28 EST


Hi Holger

On 8/7/20 5:03 PM, Holger Assmann wrote:
The KSZ9031 PHY skew timings for rxc/txc, originally set to achieve
the desired phase shift between clock- and data-signal, now trigger a
kernel warning when used in rgmii-id mode:

*-skew-ps values should be used only with phy-mode = "rgmii"

This is because commit bcf3440c6dd7 ("net: phy: micrel: add phy-mode
support for the KSZ9031 PHY") now configures own timings when
phy-mode = "rgmii-id". Device trees wanting to set their own delays
should use phy-mode "rgmii" instead as the warning prescribes.

The "standard" timings now used with "rgmii-id" work fine on this
board, so drop the explicit timings in the device tree and thereby
silence the warning.

Fixes: 666b5ca85cd3 ("ARM: dts: stm32: add STM32MP1-based Linux Automation MC-1 board")
Signed-off-by: Holger Assmann <h.assmann@xxxxxxxxxxxxxx>
---
arch/arm/boot/dts/stm32mp157c-lxa-mc1.dts | 2 --
1 file changed, 2 deletions(-)

diff --git a/arch/arm/boot/dts/stm32mp157c-lxa-mc1.dts b/arch/arm/boot/dts/stm32mp157c-lxa-mc1.dts
index 5700e6b700d3..b85025d00943 100644
--- a/arch/arm/boot/dts/stm32mp157c-lxa-mc1.dts
+++ b/arch/arm/boot/dts/stm32mp157c-lxa-mc1.dts
@@ -121,8 +121,6 @@
reset-gpios = <&gpiog 0 GPIO_ACTIVE_LOW>; /* ETH_RST# */
interrupt-parent = <&gpioa>;
interrupts = <6 IRQ_TYPE_EDGE_FALLING>; /* ETH_MDINT# */
- rxc-skew-ps = <1860>;
- txc-skew-ps = <1860>;
reset-assert-us = <10000>;
reset-deassert-us = <300>;
micrel,force-master;


Applied on stm32-next.

Thanks.
Alex