linux-kernel - Re: [PATCH 2/2] arm64: dts: allwinner: h616: update emac properties for Orange Pi Zero 3

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Date:   Sun, 22 Oct 2023 19:08:11 +0800
From:   Chukun Pan <amadeus@....edu.cn>
To:     jernej.skrabec@...il.com
Cc:     andre.przywara@....com, conor+dt@...nel.org, robh+dt@...nel.org,
        samuel@...lland.org, wens@...e.org, devicetree@...r.kernel.org,
        krzysztof.kozlowski+dt@...aro.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-sunxi@...ts.linux.dev, Chukun Pan <amadeus@....edu.cn>
Subject: Re: [PATCH 2/2] arm64: dts: allwinner: h616: update emac properties for Orange Pi Zero 3

> Can you also explain how did you figure out that additional PHY properties
> are needed? At first glance, based on description of motorcomm,keep-pll-enabled,
> it's not immediately clear why it should be needed. Same goes for second
> property.

This is based on a search for
'motorcomm,clk-out-frequency-hz = <125000000>' in the kernel.
Refer to device tree of other devices with the same properties.
After a simple short test, it seems that it is unnecessary.
I will delete these two properties in patch v2.

> 1800 ps delay basically means that rgmii is not correct type and rgmii-rxid
> should be used instead. Indeed, schematic confirms that's the case. With that,
> allwinner,rx-delay-ps can be 0 and thus ommited from DT file.

Thanks, rgmii-rxid works for me. Will be corrected in patch v2.

Thanks,
Chukun

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