netdev - Re: [PATCH] ARM: dts: add phy-reset property for rk3066a-rayeager emac

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Date:   Tue, 7 Nov 2017 17:51:27 +0800
From:   Chris Zhong <zyw@...k-chips.com>
To:     Vladimir Zapolskiy <vladimir_zapolskiy@...tor.com>,
        Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
        Roger Quadros <rogerq@...com>
Cc:     heiko@...ech.de, Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Russell King <linux@...linux.org.uk>,
        linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH] ARM: dts: add phy-reset property for rk3066a-rayeager
 emac



On 2017年11月07日 15:54, Vladimir Zapolskiy wrote:
> Hello Chris,
>
> On 11/07/2017 04:49 AM, Chris Zhong wrote:
>> The ethernet phy of rk3066a-rayeager has a reset pin, it controlled by
>> GPIO1_D6, this pin should be pull down then pull up to reset the phy.
>> Add a phy-reset property in emac, make the phy can be reset when emac
>> power on.
> for PHY reset there are properties 'reset-gpios' and 'reset-delay-us',
> please reference to Documentation/devicetree/bindings/net/mdio.txt
>
> Can you try to reuse them instead of adding new custom properties?
This phy-reset is from Documentation/devicetree/bindings/net/arc_emac.txt.
And copy from arch/arm/boot/dts/rk3036-kylin.dts.
Can we just use these properties, they are not new.
> As a side question, which is mainly addressed to Sergei and Roger,
> I don't quite understand why PHY properties were initially added to
> MAC/MDIO bus device tree nodes, in my opinion they must be moved under
> PHY device tree nodes.
>
> --
> With best wishes,
> Vladimir
>
>> Signed-off-by: Chris Zhong <zyw@...k-chips.com>
>> ---
>>
>>   arch/arm/boot/dts/rk3066a-rayeager.dts | 2 ++
>>   1 file changed, 2 insertions(+)
>>
>> diff --git a/arch/arm/boot/dts/rk3066a-rayeager.dts b/arch/arm/boot/dts/rk3066a-rayeager.dts
>> index 570157f..6064a0a 100644
>> --- a/arch/arm/boot/dts/rk3066a-rayeager.dts
>> +++ b/arch/arm/boot/dts/rk3066a-rayeager.dts
>> @@ -173,6 +173,8 @@
>>   	pinctrl-0 = <&emac_xfer>, <&emac_mdio>, <&rmii_rst>;
>>   	phy = <&phy0>;
>>   	phy-supply = <&vcc_rmii>;
>> +	phy-reset-gpios = <&gpio1 RK_PD6 GPIO_ACTIVE_LOW>; /* PHY_RST */
>> +	phy-reset-duration = <10>; /* millisecond */
>>   	status = "okay";
>>   
>>   	phy0: ethernet-phy@0 {
>>
>
>

-- 
Chris Zhong