netdev - Re: [PATCH v5 1/4] riscv: dts: starfive: jh7100: Add sysmain and gmac DT nodes

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Date: Wed, 20 Dec 2023 07:33:51 -0800
From: Emil Renner Berthing <emil.renner.berthing@...onical.com>
To: Cristian Ciocaltea <cristian.ciocaltea@...labora.com>, 
	Emil Renner Berthing <emil.renner.berthing@...onical.com>, Emil Renner Berthing <kernel@...il.dk>, 
	Conor Dooley <conor@...nel.org>, Rob Herring <robh+dt@...nel.org>, 
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, 
	Paul Walmsley <paul.walmsley@...ive.com>, Palmer Dabbelt <palmer@...belt.com>, 
	Albert Ou <aou@...s.berkeley.edu>, Richard Cochran <richardcochran@...il.com>, 
	Andrew Lunn <andrew@...n.ch>, Jacob Keller <jacob.e.keller@...el.com>
Cc: linux-riscv@...ts.infradead.org, devicetree@...r.kernel.org, 
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org, kernel@...labora.com
Subject: Re: [PATCH v5 1/4] riscv: dts: starfive: jh7100: Add sysmain and gmac
 DT nodes

Cristian Ciocaltea wrote:
> On 12/20/23 15:43, Emil Renner Berthing wrote:
> > Cristian Ciocaltea wrote:
> >> Provide the sysmain and gmac DT nodes supporting the DWMAC found on the
> >> StarFive JH7100 SoC.
> >>
> >> Co-developed-by: Emil Renner Berthing <emil.renner.berthing@...onical.com>
> >> Signed-off-by: Emil Renner Berthing <emil.renner.berthing@...onical.com>
> >> Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@...labora.com>
> >> Reviewed-by: Jacob Keller <jacob.e.keller@...el.com>
> >> ---
> >>  arch/riscv/boot/dts/starfive/jh7100.dtsi | 36 ++++++++++++++++++++++++
> >>  1 file changed, 36 insertions(+)
> >>
> >> diff --git a/arch/riscv/boot/dts/starfive/jh7100.dtsi b/arch/riscv/boot/dts/starfive/jh7100.dtsi
> >> index c216aaecac53..2ebdebe6a81c 100644
> >> --- a/arch/riscv/boot/dts/starfive/jh7100.dtsi
> >> +++ b/arch/riscv/boot/dts/starfive/jh7100.dtsi
> >> @@ -204,6 +204,37 @@ sdio1: mmc@...10000 {
> >>  			status = "disabled";
> >>  		};
> >>
> >> +		gmac: ethernet@...20000 {
> >> +			compatible = "starfive,jh7100-dwmac", "snps,dwmac";
> >> +			reg = <0x0 0x10020000 0x0 0x10000>;
> >> +			clocks = <&clkgen JH7100_CLK_GMAC_ROOT_DIV>,
> >> +				 <&clkgen JH7100_CLK_GMAC_AHB>,
> >> +				 <&clkgen JH7100_CLK_GMAC_PTP_REF>,
> >> +				 <&clkgen JH7100_CLK_GMAC_TX_INV>,
> >> +				 <&clkgen JH7100_CLK_GMAC_GTX>;
> >> +			clock-names = "stmmaceth", "pclk", "ptp_ref", "tx", "gtx";
> >> +			resets = <&rstgen JH7100_RSTN_GMAC_AHB>;
> >> +			reset-names = "ahb";
> >> +			interrupts = <6>, <7>;
> >> +			interrupt-names = "macirq", "eth_wake_irq";
> >> +			max-frame-size = <9000>;
> >> +			snps,multicast-filter-bins = <32>;
> >> +			snps,perfect-filter-entries = <128>;
> >> +			starfive,syscon = <&sysmain 0x70 0>;
> >> +			rx-fifo-depth = <32768>;
> >> +			tx-fifo-depth = <16384>;
> >> +			snps,axi-config = <&stmmac_axi_setup>;
> >> +			snps,fixed-burst;
> >> +			snps,force_thresh_dma_mode;
> >
> > Compared to v4 you're missing a
> >
> >   snps,no-pbl-x8;
> >
> > here. It might be the right thing to do, but then I would have expected
> > it to me mentioned in the cover letter version history.
>
> Oh yes, I missed to add this to the changelog, sorry!  I dropped that
> because the property is only valid for snps,dwmac-{3.50a, 4.10a, 4.20a,
> 5.20} compatibles, while we have plain snps,dwmac to handle 3.7x.
>
> We could have probably used snps,dwmac-3.70a or snps,dwmac-3.710, but
> I'm not sure which is the exact chip revision and it wouldn't really
> change anything as there is no special handling for them in the
> snps,dwmac.yaml binding.

I see, makes sense. This way works fine for me.

/Emil