c45 phy support on AM62A

ren ranxi

Prodigy 100 points

Part Number: AM62A7

Tool/software:

Translation

TI Engineer,

I am using TJA110 C45 on AM62A7 ,the driver is

board-support/ti-linux-kernel-6.6.32+git-ti/drivers/net/phy/nxp-c45-tja11xx.c

Encountered the following issue:

Environment:
ti-processor-sdk-linux-edgeai-am62a-evm-10_00_00_08

Device Tree

&cpsw3g_mdio {
        status = "okay";
        pinctrl-names = "default";
        pinctrl-0 = <&main_mdio1_pins_default>;

        cpsw3g_phy1: ethernet-phy@1 {
                compatible = "ethernet-phy-ieee802.3-c45";
                reg = <1>;
                //ti,rx-internal-delay = <DP83867_RGMIIDCTL_2_00_NS>;
                //ti,fifo-depth = <DP83867_PHYCR_FIFO_DEPTH_4_B_NIB>;
                ti,min-output-impedance;
        };
};

Error
get_phy_device

get_phy_c45_ids
- get_phy_c45_devs_in_pkg
  - mdiobus_c45_read // returns -22

How should I resolve this issue?

Best regards,
ranxi ren

2 days ago

0 Daolin Qiu 1 day ago

TI__Expert 8175 points

Hello Ranxi,

ren ranxi said:
mdiobus_c45_read // returns -22

First, I took a look at the get_phy_c45_devs_ids function (drivers/net/phy/phy_device.c) and it seems that the only expected return values are 0, -EIO (-5), or -ENODEV (-19). A return value of -22 (-EINVAL) would indicate some sort of invalid argument. https://elixir.bootlin.com/linux/v6.12.4/source/include/uapi/asm-generic/errno-base.h

On AM62Ax devices, the ethernet driver should be am65-cpsw-nuss.c and the mdio driver is davinci_mdio.c. Within davinci_mdio.c (drivers/net/ethernet/ti/davinci_mdio.c), there is a function callback davinci_mdiobb_read_c45 that is needed for reading clause 45 registers via mdio bitbang/manual mode.

https://lore.kernel.org/all/20221227-v6-2-rc1-c45-seperation-v3-6-ade1deb438da@walle.cc/

Reading c45 registers using davinci_mdiobb_read_c45 requires your MDIO to be operating in bitbang/manual mode. By default, on our TI Linux SDK, MDIO should already be configured in bitbang/manual mode: https://lore.kernel.org/netdev/20220810111345.31200-1-r-gunasekaran@ti.com/T/

1. Can you check if your MDIO running in bitbang/manual mode?

2. Does the davinci_mdiobb_read_c45 function get called when your PHY device is initializing?

3. Can you insert a boot log of your device booting up? (Paste the log with Insert->Code)

-Daolin

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c45 phy support on AM62A