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

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Date:   Thu, 9 Nov 2017 10:28:03 +0200
From:   Roger Quadros <rogerq@...com>
To:     Chris Zhong <zyw@...k-chips.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Zapolskiy <vladimir_zapolskiy@...tor.com>,
        Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
        <andrew@...n.ch>
CC:     Mark Rutland <mark.rutland@....com>, <devicetree@...r.kernel.org>,
        <heiko@...ech.de>, <netdev@...r.kernel.org>,
        Russell King <linux@...linux.org.uk>,
        <linux-kernel@...r.kernel.org>,
        <linux-rockchip@...ts.infradead.org>,
        Rob Herring <robh+dt@...nel.org>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] ARM: dts: add phy-reset property for rk3066a-rayeager
 emac

On 08/11/17 11:49, Chris Zhong wrote:
> Hi Florian Fainelli
> 
> 
> On 2017年11月08日 02:26, Florian Fainelli wrote:
>> On 11/07/2017 01:51 AM, Chris Zhong wrote:
>>>
>>> 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.
>> Because it already exists does not mean it's correct, in fact, it is not
>> at all because it places the reset property for a PHY into the MAC node,
>> which is just not what this is, what we should be using instead is the
>> following patch series:
>>
>> http://patchwork.ozlabs.org/project/netdev/list/?series=9267
>>
>> http://patchwork.ozlabs.org/patch/828499/
>> http://patchwork.ozlabs.org/patch/828505/
>> http://patchwork.ozlabs.org/patch/828501/
>> http://patchwork.ozlabs.org/patch/828502/
> Okay, this series works for me, and I will push a new version patch following it,
> with a reset-gpios property under phy node.
> And hope this series can be applied soon.
> 

If 'reset-gpios' and 'reset-delay-us' as per [1] works for you
then why not use that?

[1] Documentation/devicetree/bindings/net/mdio.txt

> Thanks
> Chris Zhong
> 
> 
>>>> 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 {
>>>>>
>>>>
>>
> 

-- 
cheers,
-roger

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