On 13:44-20240112, Sjoerd Simons wrote:
> The beagleplay dts was using a bit-bang gpio mdio bus as a work-around
> for errata i2329. However since commit d04807b80691 ("net: ethernet: ti:
> davinci_mdio: Add workaround for errata i2329") the mdio driver itself
> already takes care of this errata for effected silicon, which landed
> well before the beagleplay dts. So i suspect the reason for the
> workaround in upstream was simply due to copying the vendor dts.
>
> Switch the dts to the ti,cpsw-mdio instead so it described the actual
> hardware and is consistent with other AM625 based boards
>
> Signed-off-by: Sjoerd Simons <sjoerd@xxxxxxxxxxxxx>
>
> ---
We have had issues with the ethernet integration previously (also why
ethernet in u-boot is not yet functional on beagleplay[1]).
https://openbeagle.org/beagleplay/beagleplay/-/issues/101
we should probably do a 1000 boot nfs test or something to ensure this
doesn't introduce regressions (I recollect mdio wasn't stable on
beagleplay) and switching to bitbang driver stopped all complains.
[1] https://lore.kernel.org/u-boot/20230822121350.51324-1-rogerq@xxxxxxxxxx/
>
> .../arm64/boot/dts/ti/k3-am625-beagleplay.dts | 42 +++++++------------
> 1 file changed, 16 insertions(+), 26 deletions(-)
>
> diff --git a/arch/arm64/boot/dts/ti/k3-am625-beagleplay.dts b/arch/arm64/boot/dts/ti/k3-am625-beagleplay.dts
> index eadbdd9ffe37..49fb21ba62b0 100644
> --- a/arch/arm64/boot/dts/ti/k3-am625-beagleplay.dts
> +++ b/arch/arm64/boot/dts/ti/k3-am625-beagleplay.dts
> @@ -29,7 +29,6 @@ aliases {
> i2c3 = &main_i2c3;
> i2c4 = &wkup_i2c0;
> i2c5 = &mcu_i2c0;
> - mdio-gpio0 = &mdio0;
> mmc0 = &sdhci0;
> mmc1 = &sdhci1;
> mmc2 = &sdhci2;
> @@ -231,27 +230,6 @@ simple-audio-card,codec {
> };
> };
>
> - /* Workaround for errata i2329 - just use mdio bitbang */
> - mdio0: mdio {
> - compatible = "virtual,mdio-gpio";
> - pinctrl-names = "default";
> - pinctrl-0 = <&mdio0_pins_default>;
> - gpios = <&main_gpio0 86 GPIO_ACTIVE_HIGH>, /* MDC */
> - <&main_gpio0 85 GPIO_ACTIVE_HIGH>; /* MDIO */
> - #address-cells = <1>;
> - #size-cells = <0>;
> -
> - cpsw3g_phy0: ethernet-phy@0 {
> - reg = <0>;
> - };
> -
> - cpsw3g_phy1: ethernet-phy@1 {
> - reg = <1>;
> - reset-gpios = <&main_gpio1 5 GPIO_ACTIVE_LOW>;
> - reset-assert-us = <25>;
> - reset-deassert-us = <60000>; /* T2 */
> - };
> - };
> };
>
> &main_pmx0 {
> @@ -312,8 +290,8 @@ AM62X_IOPAD(0x00b4, PIN_INPUT_PULLUP, 1) /* (K24) GPMC0_CSn3.I2C2_SDA */
>
> mdio0_pins_default: mdio0-default-pins {
> pinctrl-single,pins = <
> - AM62X_IOPAD(0x0160, PIN_OUTPUT, 7) /* (AD24) MDIO0_MDC.GPIO0_86 */
> - AM62X_IOPAD(0x015c, PIN_INPUT, 7) /* (AB22) MDIO0_MDIO.GPIO0_85 */
> + AM62X_IOPAD(0x0160, PIN_OUTPUT, 0) /* (AD24) MDIO0_MDC */
> + AM62X_IOPAD(0x015c, PIN_INPUT, 0) /* (AB22) MDIO0_MDIO */
> >;
> };
>
> @@ -611,8 +589,20 @@ &cpsw_port2 {
> };
>
> &cpsw3g_mdio {
> - /* Workaround for errata i2329 - Use mdio bitbang */
> - status = "disabled";
> + status = "okay";
> + pinctrl-names = "default";
> + pinctrl-0 = <&mdio0_pins_default>;
> +
> + cpsw3g_phy0: ethernet-phy@0 {
> + reg = <0>;
> + };
> +
> + cpsw3g_phy1: ethernet-phy@1 {
> + reg = <1>;
> + reset-gpios = <&main_gpio1 5 GPIO_ACTIVE_LOW>;
> + reset-assert-us = <25>;
> + reset-deassert-us = <60000>; /* T2 */
> + };
> };
>
> &main_gpio0 {
> --
> 2.43.0
>
--
Regards,
Nishanth Menon
Key (0xDDB5849D1736249D) / Fingerprint: F8A2 8693 54EB 8232 17A3 1A34 DDB5 849D 1736 249D
