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

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Message-ID: <7cab13f6-ac54-8f5c-c1bf-35e6c3b5d9db@microchip.com>
Date:   Wed, 22 Jul 2020 11:38:37 +0000
From:   <Codrin.Ciubotariu@...rochip.com>
To:     <Claudiu.Beznea@...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 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 {
			...
		};
	};
};

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(-)