linux-kernel - Re: [PATCH net-next v2 0/7] Add an MDIO sub-node under MACB

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Date:   Thu, 23 Jul 2020 07:51:48 +0000
From:   <Claudiu.Beznea@...rochip.com>
To:     <Codrin.Ciubotariu@...rochip.com>, <netdev@...r.kernel.org>,
        <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
CC:     <Nicolas.Ferre@...rochip.com>, <davem@...emloft.net>,
        <kuba@...nel.org>, <andrew@...n.ch>, <f.fainelli@...il.com>,
        <robh+dt@...nel.org>, <alexandre.belloni@...tlin.com>,
        <Ludovic.Desroches@...rochip.com>
Subject: Re: [PATCH net-next v2 0/7] Add an MDIO sub-node under MACB



On 22.07.2020 14:38, Codrin Ciubotariu - M19940 wrote:
> On 22.07.2020 13:32, Claudiu Beznea - M18063 wrote:
>>
>>
>> On 21.07.2020 20:13, Codrin Ciubotariu wrote:
>>> Adding the PHY nodes directly under the Ethernet node became deprecated,
>>> so the aim of this patch series is to make MACB use an MDIO node as
>>> container for MDIO devices.
>>> This patch series starts with a small patch to use the device-managed
>>> devm_mdiobus_alloc(). In the next two patches we update the bindings and
>>> adapt macb driver to parse the device-tree PHY nodes from under an MDIO
>>> node. The last patches add the MDIO node in the device-trees of sama5d2,
>>> sama5d3, samad4 and sam9x60 boards.
>>>
>>
>> Tested this series on sama5d2_xplained in the following scenarios:
>>
>> 1/ PHY bindings from patch 4/7:
>> mdio {
>> 	#address-cells = <1>;
>> 	#size-cells = <0>;
>> 	ethernet-phy@1 {
>> 		reg = <0x1>;
>> 		interrupt-parent = <&pioA>;
>> 		interrupts = <PIN_PC9 IRQ_TYPE_LEVEL_LOW>;
>> };
>>
>> 2/ PHY bindings before this series:
>> ethernet-phy@1 {
>> 	reg = <0x1>;
>> 	interrupt-parent = <&pioA>;
>> 	interrupts = <PIN_PC9 IRQ_TYPE_LEVEL_LOW>;
>> };
>>
>> 3/ No PHY bindings at all.
>>
>> All 3 cases went OK.
>>
>> You can add:
>> Tested-by: Claudiu Beznea <claudiu.beznea@...rochip.com>
>> Acked-by: Claudiu Beznea <claudiu.beznea@...rochip.com>
> 
> Thank you very much Claudiu!
> There is still one more case in my mind. macb could be a fixed-link with 
> an MDIO DSA switch. While the macb would have a fixed connection with a 
> port from the DSA switch, the switch could be configured using macb's 
> MDIO. The dt would be something like:
> 
> macb {
> 	fixed-link {
> 		...
> 	};
> 	mdio {
> 		switch@0 {
> 			...
> 		};
> 	};
> };

Do you have a setup for testing this? At the moment I don't know a
configuration like this that macb is working with.

> 
> To support this, in patch 3/7 I should first check for the mdio node to 
> return of_mdiobus_register() and then check if it's a fixed-link to 
> return simple mdiobus_register(). I will address this in v3...> 
> Thanks and best regards,
> Codrin
> 
>>
>> Thank you,
>> Claudiu Beznea
>>
>>> Changes in v2:
>>>   - renamed patch 2/7 from "macb: bindings doc: use an MDIO node as a
>>>     container for PHY nodes" to "dt-bindings: net: macb: use an MDIO
>>>     node as a container for PHY nodes"
>>>   - added back a newline removed by mistake in patch 3/7
>>>
>>> Codrin Ciubotariu (7):
>>>    net: macb: use device-managed devm_mdiobus_alloc()
>>>    dt-bindings: net: macb: use an MDIO node as a container for PHY nodes
>>>    net: macb: parse PHY nodes found under an MDIO node
>>>    ARM: dts: at91: sama5d2: add an mdio sub-node to macb
>>>    ARM: dts: at91: sama5d3: add an mdio sub-node to macb
>>>    ARM: dts: at91: sama5d4: add an mdio sub-node to macb
>>>    ARM: dts: at91: sam9x60: add an mdio sub-node to macb
>>>
>>>   Documentation/devicetree/bindings/net/macb.txt | 15 ++++++++++++---
>>>   arch/arm/boot/dts/at91-sam9x60ek.dts           |  8 ++++++--
>>>   arch/arm/boot/dts/at91-sama5d27_som1.dtsi      | 16 ++++++++++------
>>>   arch/arm/boot/dts/at91-sama5d27_wlsom1.dtsi    | 17 ++++++++++-------
>>>   arch/arm/boot/dts/at91-sama5d2_ptc_ek.dts      | 13 ++++++++-----
>>>   arch/arm/boot/dts/at91-sama5d2_xplained.dts    | 12 ++++++++----
>>>   arch/arm/boot/dts/at91-sama5d3_xplained.dts    | 16 ++++++++++++----
>>>   arch/arm/boot/dts/at91-sama5d4_xplained.dts    | 12 ++++++++----
>>>   drivers/net/ethernet/cadence/macb_main.c       | 18 ++++++++++++------
>>>   9 files changed, 86 insertions(+), 41 deletions(-)
>