[Linux-stm32] [PATCH V4 00/22] ARM: dts: stm32: Repair AV96 board

[Marek Vasut]

On 4/6/20 9:27 AM, Manivannan Sadhasivam wrote:
> Hi,

Hi,

> On Wed, Apr 01, 2020 at 03:22:15PM +0200, Marek Vasut wrote:
>> The AV96 board device tree is completely broken and does not match the
>> hardware. This series fixes it up.
>>
>> Marek Vasut (22):
>>   ARM: dts: stm32: Add alternate pinmux for ethernet RGMII
>>   ARM: dts: stm32: Repair ethernet operation on AV96
>>   ARM: dts: stm32: Add missing ethernet PHY reset on AV96
>>   ARM: dts: stm32: Add missing ethernet PHY skews on AV96
> 
> Ethernet works fine with cold boot but after warm reboot it fails with below
> message,
> 
> [   18.192842] stm32-dwmac 5800a000.ethernet eth0: no phy at addr -1
> [   18.197539] stm32-dwmac 5800a000.ethernet eth0: stmmac_open: Cannot attach to PHY (err)

Try this patch:

diff --git a/arch/arm/boot/dts/stm32mp157a-avenger96.dts
b/arch/arm/boot/dts/stm32mp157a-avenger96.dts
index 9fcc15b6e76d..3387d6353418 100644
--- a/arch/arm/boot/dts/stm32mp157a-avenger96.dts
+++ b/arch/arm/boot/dts/stm32mp157a-avenger96.dts
@@ -136,12 +136,14 @@ &ethernet0 {
        phy-mode = "rgmii";
        max-speed = <1000>;
        phy-handle = <&phy0>;
-       phy-reset-gpios = <&gpioz 2 GPIO_ACTIVE_LOW>;

        mdio0 {
                #address-cells = <1>;
                #size-cells = <0>;
                compatible = "snps,dwmac-mdio";
+               reset-gpios = <&gpioz 2 GPIO_ACTIVE_LOW>;
+               reset-delay-us = <1000>;
+
                phy0: ethernet-phy at 7 {
                        reg = <7>;