Re: [PATCH 2/2] ARM: dts: owl-s500-roseapplepi: Add ethernet support

Cristian Ciocaltea
2021-06-11T06:32:08Z

On Fri, Jun 11, 2021 at 11:26:06AM +0530, Manivannan Sadhasivam wrote:
> On Fri, Jun 11, 2021 at 12:09:22AM +0300, Cristian Ciocaltea wrote:
> > Add pinctrl configuration for enabling the Ethernet MAC on RoseapplePi
> > SBC. Additionally, provide the necessary properties for the generic S500
> > ethernet node in order to setup PHY and MDIO.
> >
> > Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@gmail.com>
> > ---
> > arch/arm/boot/dts/owl-s500-roseapplepi.dts | 56 ++++++++++++++++++++++
> > 1 file changed, 56 insertions(+)
> >
> > diff --git a/arch/arm/boot/dts/owl-s500-roseapplepi.dts b/arch/arm/boot/dts/owl-s500-roseapplepi.dts
> > index b8c5db2344aa..bffabc7eaa50 100644
> > --- a/arch/arm/boot/dts/owl-s500-roseapplepi.dts
> > +++ b/arch/arm/boot/dts/owl-s500-roseapplepi.dts
> > @@ -225,6 +225,38 @@ bias1-pinconf {
> > bias-pull-down;
> > };
> > };
> > +
> > + ethernet_pins: ethernet-pins {
> > + txd01-pinmux {
> > + groups = "rmii_txd0_mfp", "rmii_txd1_mfp";
> > + function = "eth_rmii";
> > + };
> > +
> > + rxd01-pinmux {
> > + groups = "rmii_rxd0_mfp", "rmii_rxd1_mfp";
> > + function = "eth_rmii";
> > + };
> > +
> > + txen_rxer-pinmux {
> > + groups = "rmii_txen_mfp", "rmii_rxen_mfp";
> > + function = "eth_rmii";
> > + };
> > +
> > + crs_dv_ref_clk-pinmux {
> > + groups = "rmii_crs_dv_mfp", "rmii_ref_clk_mfp";
> > + function = "eth_rmii";
>
> Since the function is same, just club all the groups together.

Sure.

> > + };
> > +
> > + ref_clk-pinconf {
> > + groups = "rmii_ref_clk_drv";
> > + drive-strength = <2>;
> > + };
> > +
> > + phy_clk-pinmux {
> > + groups = "clko_25m_mfp";
> > + function = "clko_25m";
> > + };
>
> Move this above node pinconf.

Ok.

> > + };
> > };
> >
> > /* uSD */
> > @@ -241,6 +273,30 @@ &mmc0 {
> > vqmmc-supply = <&sd_vcc>;
> > };
> >
> > +&ethernet {
> > + pinctrl-names = "default";
> > + pinctrl-0 = <&ethernet_pins>;
> > + phy-mode = "rmii";
> > + phy-handle = <&eth_phy>;
> > + status = "okay";
> > +
> > + mdio {
> > + #address-cells = <1>;
> > + #size-cells = <0>;
> > +
> > + reset-gpios = <&pinctrl 88 GPIO_ACTIVE_LOW>; /* GPIOC24 */
> > + reset-delay-us = <10000>;
> > + reset-post-delay-us = <150000>;
>
> reset-* properties belong to "ethernet-phy" node. Also, while adding new nodes
> please run the dtbs_check and try to address the warnings.

The properties are those described in Documentation/devicetree/bindings/net/mdio.yaml
The dtbs_check doesn't report any issues in my case, usually this
happens when dtschema is not updated to the latest version. I always
run the following command after rebasing to a new kernel version:

pip3 install --upgrade dtschema

Thanks for the review,
Cristi

> Thanks,
> Mani
>
> > +
> > + eth_phy: ethernet-phy@3 {
> > + reg = <0x3>;
> > + max-speed = <100>;
> > + interrupt-parent = <&sirq>;
> > + interrupts = <0 IRQ_TYPE_LEVEL_LOW>;
> > + };
> > + };
> > +};
> > +
> > &twd_timer {
> > status = "okay";
> > };
> > --
> > 2.32.0
> >