linux-kernel - Re: [PATCH 2/2] dts: r40: add second ethernet support

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Date:   Mon, 8 Mar 2021 14:37:43 +0100
From:   Maxime Ripard <maxime@...no.tech>
To:     Evgeny Boger <boger@...enboard.com>
Cc:     Chen-Yu Tsai <wens@...e.org>, linux-arm-kernel@...ts.infradead.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Rob Herring <robh+dt@...nel.org>
Subject: Re: [PATCH 2/2] dts: r40: add second ethernet support

Hi,

On Sun, Mar 07, 2021 at 06:13:53AM +0300, Evgeny Boger wrote:
> R40 (aka V40, A40i, T3) has two different Ethernet IP
> called EMAC and GMAC.
> EMAC only support 10/100 Mbit in MII mode,
> while GMAC support both 10/100 (MII) and 10/100/1000 (RGMII).
> 
> In contrast to A10/A20 where GMAC and EMAC share the same pins
> making EMAC somewhat pointless, on R40 EMAC can be routed to port H.
> Both EMAC (on port H) and GMAC (on port A)
>  can be then enabled at the same time, allowing for two ethernet ports.
> 
> Signed-off-by: Evgeny Boger <boger@...enboard.com>
> ---
>  arch/arm/boot/dts/sun8i-r40.dtsi | 53 ++++++++++++++++++++++++++++++++
>  1 file changed, 53 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/sun8i-r40.dtsi b/arch/arm/boot/dts/sun8i-r40.dtsi
> index d5ad3b9efd12..c102c1510012 100644
> --- a/arch/arm/boot/dts/sun8i-r40.dtsi
> +++ b/arch/arm/boot/dts/sun8i-r40.dtsi
> @@ -217,6 +217,20 @@
>  			#size-cells = <1>;
>  			ranges;
>  
> +			sram_a: sram@0 {
> +				compatible = "mmio-sram";
> +				reg = <0x00000000 0xc000>;
> +				#address-cells = <1>;
> +				#size-cells = <1>;
> +				ranges = <0 0x00000000 0xc000>;
> +
> +				emac_sram: sram-section@...0 {
> +					compatible = "allwinner,sun4i-a10-sram-a3-a4";
> +					reg = <0x8000 0x4000>;
> +					status = "okay";
> +				};
> +			};
> +
>  			sram_c: sram@...0000 {
>  				compatible = "mmio-sram";
>  				reg = <0x01d00000 0xd0000>;
> @@ -541,6 +555,24 @@
>  				drive-strength = <40>;
>  			};
>  
> +			emac_ph_pins: emac-ph-pins {
> +				pins = "PH8", "PH9", "PH10", "PH11",
> +				       "PH14", "PH15", "PH16", "PH17",
> +				       "PH18","PH19", "PH20", "PH21",
> +				       "PH22", "PH23", "PH24", "PH25",
> +				       "PH26", "PH27";
> +				function = "emac";
> +			};
> +
> +			emac_pa_pins: emac-pa-pins {
> +				pins = "PA0", "PA1", "PA2",
> +				       "PA3", "PA4", "PA5", "PA6",
> +				       "PA7", "PA8", "PA9", "PA10",
> +				       "PA11", "PA12", "PA13", "PA14",
> +				       "PA15", "PA16";
> +				function = "emac";
> +			};
> +

These nodes should be order alphabetically 

>  			i2c0_pins: i2c0-pins {
>  				pins = "PB0", "PB1";
>  				function = "i2c0";
> @@ -885,6 +917,27 @@
>  			};
>  		};
>  
> +		emac: ethernet@...b000 {
> +			syscon = <&ccu>;

Why is the syscon needed? You weren't using it in the driver

> +			compatible = "allwinner,sun4i-a10-emac";
> +			reg = <0x01c0b000 0x1000>;
> +			interrupts = <GIC_SPI 55 IRQ_TYPE_LEVEL_HIGH>;
> +			clocks = <&ccu CLK_BUS_EMAC>;
> +			resets = <&ccu RST_BUS_EMAC>;
> +			allwinner,sram = <&emac_sram 1>;
> +			pinctrl-names = "default";
> +			pinctrl-0 = <&emac_ph_pins>;

If there's several options, we really can't enforce a default here, it
should be in the board DTS.

Maxime

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