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

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Date:   Fri, 11 Jun 2021 09:31:47 +0300
From:   Cristian Ciocaltea <cristian.ciocaltea@...il.com>
To:     Manivannan Sadhasivam <mani@...nel.org>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Andreas Färber <afaerber@...e.de>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-actions@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] ARM: dts: owl-s500-roseapplepi: Add ethernet support

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@...il.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
> >