netdev - Re: [PATCH net-next v8 3/6] arm64: dts: mt2712: update ethernet device node

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Date:   Thu, 16 Dec 2021 17:19:08 +0800
From:   Biao Huang <biao.huang@...iatek.com>
To:     Matthias Brugger <matthias.bgg@...il.com>, <davem@...emloft.net>,
        "Jakub Kicinski" <kuba@...nel.org>,
        Rob Herring <robh+dt@...nel.org>
CC:     Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Jose Abreu <joabreu@...opsys.com>,
        "Maxime Coquelin" <mcoquelin.stm32@...il.com>,
        <netdev@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <srv_heupstream@...iatek.com>, <macpaul.lin@...iatek.com>,
        <angelogioacchino.delregno@...labora.com>, <dkirjanov@...e.de>
Subject: Re: [PATCH net-next v8 3/6] arm64: dts: mt2712: update ethernet
 device node

Dear Matthias,
	Thanks for your comments~

On Wed, 2021-12-15 at 20:20 +0100, Matthias Brugger wrote:
> 
> On 10/12/2021 02:31, Biao Huang wrote:
> > Since there are some changes in ethernet driver,
> > update ethernet device node in dts to accommodate to it.
> > 
> 
> I have a hard time to understand how the changes in 1/6 and 2/6 are
> related to 
> that.
> 
> Please explain better what has changed. Also beware that we shouldn't
> introduce 
> any non-backward compatible DTS changes. That means, the device
> should work with 
> the new driver but an older device tree.
> 
> Regards,
> Matthias
> 

http://lists.infradead.org/pipermail/linux-mediatek/2021-December/032812.html
I've add more details to commit message in v10 send,
please kindly review it.

Regards!
Biao

> > Signed-off-by: Biao Huang <biao.huang@...iatek.com>
> > ---
> >   arch/arm64/boot/dts/mediatek/mt2712-evb.dts |  1 +
> >   arch/arm64/boot/dts/mediatek/mt2712e.dtsi   | 14 +++++++++-----
> >   2 files changed, 10 insertions(+), 5 deletions(-)
> > 
> > diff --git a/arch/arm64/boot/dts/mediatek/mt2712-evb.dts
> > b/arch/arm64/boot/dts/mediatek/mt2712-evb.dts
> > index 7d369fdd3117..11aa135aa0f3 100644
> > --- a/arch/arm64/boot/dts/mediatek/mt2712-evb.dts
> > +++ b/arch/arm64/boot/dts/mediatek/mt2712-evb.dts
> > @@ -110,6 +110,7 @@ &eth {
> >   	phy-handle = <&ethernet_phy0>;
> >   	mediatek,tx-delay-ps = <1530>;
> >   	snps,reset-gpio = <&pio 87 GPIO_ACTIVE_LOW>;
> > +	snps,reset-delays-us = <0 10000 10000>;
> >   	pinctrl-names = "default", "sleep";
> >   	pinctrl-0 = <&eth_default>;
> >   	pinctrl-1 = <&eth_sleep>;
> > diff --git a/arch/arm64/boot/dts/mediatek/mt2712e.dtsi
> > b/arch/arm64/boot/dts/mediatek/mt2712e.dtsi
> > index a9cca9c146fd..9e850e04fffb 100644
> > --- a/arch/arm64/boot/dts/mediatek/mt2712e.dtsi
> > +++ b/arch/arm64/boot/dts/mediatek/mt2712e.dtsi
> > @@ -726,7 +726,7 @@ queue2 {
> >   	};
> >   
> >   	eth: ethernet@...1c000 {
> > -		compatible = "mediatek,mt2712-gmac";
> > +		compatible = "mediatek,mt2712-gmac", "snps,dwmac-
> > 4.20a";
> >   		reg = <0 0x1101c000 0 0x1300>;
> >   		interrupts = <GIC_SPI 237 IRQ_TYPE_LEVEL_LOW>;
> >   		interrupt-names = "macirq";
> > @@ -734,15 +734,19 @@ eth: ethernet@...1c000 {
> >   		clock-names = "axi",
> >   			      "apb",
> >   			      "mac_main",
> > -			      "ptp_ref";
> > +			      "ptp_ref",
> > +			      "rmii_internal";
> >   		clocks = <&pericfg CLK_PERI_GMAC>,
> >   			 <&pericfg CLK_PERI_GMAC_PCLK>,
> >   			 <&topckgen CLK_TOP_ETHER_125M_SEL>,
> > -			 <&topckgen CLK_TOP_ETHER_50M_SEL>;
> > +			 <&topckgen CLK_TOP_ETHER_50M_SEL>,
> > +			 <&topckgen CLK_TOP_ETHER_50M_RMII_SEL>;
> >   		assigned-clocks = <&topckgen CLK_TOP_ETHER_125M_SEL>,
> > -				  <&topckgen CLK_TOP_ETHER_50M_SEL>;
> > +				  <&topckgen CLK_TOP_ETHER_50M_SEL>,
> > +				  <&topckgen
> > CLK_TOP_ETHER_50M_RMII_SEL>;
> >   		assigned-clock-parents = <&topckgen
> > CLK_TOP_ETHERPLL_125M>,
> > -					 <&topckgen CLK_TOP_APLL1_D3>;
> > +					 <&topckgen CLK_TOP_APLL1_D3>,
> > +					 <&topckgen
> > CLK_TOP_ETHERPLL_50M>;
> >   		power-domains = <&scpsys MT2712_POWER_DOMAIN_AUDIO>;
> >   		mediatek,pericfg = <&pericfg>;
> >   		snps,axi-config = <&stmmac_axi_setup>;
> >