netdev - Re: [RFC PATCH 1/3] arcnet: com20020: Add memory map of com20020

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Message-ID: <CAPoXtQK2s-G3sPHOQQcEQe+O9LGBWBv3Jrsy_NTVNo_nAtd1bg@mail.gmail.com>
Date:   Fri, 11 May 2018 12:50:16 +0200
From:   Andrea Greco <andrea.greco.gapmilano@...il.com>
To:     Rob Herring <robh@...nel.org>
Cc:     m.grzeschik@...gutronix.de, Andrea Greco <a.greco@...gma.it>,
        Mark Rutland <mark.rutland@....com>, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 1/3] arcnet: com20020: Add memory map of com20020

On 05/08/2018 06:16 PM, Rob Herring wrote:
> On Sat, May 05, 2018 at 11:34:45PM +0200, Andrea Greco wrote:
>> From: Andrea Greco <a.greco@...gma.it>
>>
>> Add support for com20022I/com20020, memory mapped chip version.
>> Support bus: Intel 80xx and Motorola 68xx.
>> Bus size: Only 8 bit bus size is supported.
>> Added related device tree bindings
>>
>> Signed-off-by: Andrea Greco <a.greco@...gma.it>
>> ---
>>   .../devicetree/bindings/net/smsc-com20020.txt      |  23 +++
>
> Please split bindings to separate patch.

Ok
>
>>   drivers/net/arcnet/Kconfig                         |  12 +-
>>   drivers/net/arcnet/Makefile                        |   1 +
>>   drivers/net/arcnet/arcdevice.h                     |  27 ++-
>>   drivers/net/arcnet/com20020-membus.c               | 191 +++++++++++++++++++++
>>   drivers/net/arcnet/com20020.c                      |   9 +-
>>   6 files changed, 253 insertions(+), 10 deletions(-)
>>   create mode 100644 Documentation/devicetree/bindings/net/smsc-com20020.txt
>>   create mode 100644 drivers/net/arcnet/com20020-membus.c
>>
>> diff --git a/Documentation/devicetree/bindings/net/smsc-com20020.txt b/Documentation/devicetree/bindings/net/smsc-com20020.txt
>> new file mode 100644
>> index 000000000000..39c5b19c55af
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/net/smsc-com20020.txt
>> @@ -0,0 +1,23 @@
>> +SMSC com20020, com20022I
>
> What does this device do?
>

Changed in:
SMSC com20020 Arcnet network controller

>> +
>> +timeout: Arcnet timeout, checkout datashet
>> +clockp: Clock Prescaler, checkout datashet
>
> s/datashet/datasheet/
>
>> +clockm: Clock multiplier, checkout datasheet
>
> Would these 3 properties be common for arcnet devices? If not, then they
> should have a vendor prefix.
>

Timeout is arcnet propelty:
Other is smsc params, then become:
- timeout: Arcnet timeout
- smsc-clockp: Clock Prescaler
- smsc-clockm: Clock multiplier
- smsc-backplane: Controller use backplane mode inside of transceiver

I forget backplane propelty, but is required

>> +
>> +phy-reset-gpios: Chip reset ppin
>
> Use 'reset-gpios' as that is standard.
>
>> +phy-irq-gpios: Chip irq pin
>
> Use 'interrupts'. Interrupt capable gpio controllers are also interrupt
> controllers.
>

Ok, change to standard

>> +
>> +com20020_A@0 {
>
> Node names should be generic based on the class of device. I don't think
> we have one defined, but how about 'arcnet'.
>
> Unit addresses must have a corresponding reg property. How is this
> device accessed?
>

Then: arcnet@...00000

>> +    compatible = "smsc,com20020";
>
> Not documented.
>
I miss something? Where add this doc?
Is not this file?
Documentation/devicetree/bindings/net/smsc-com20020.txt

>> +
>> + timeout = <0x3>;
>> + backplane = <0x0>;
>> +
>> + clockp = <0x0>;
>> + clockm = <0x3>;
>> +
>> + phy-reset-gpios = <&gpio3 21 GPIO_ACTIVE_LOW>;
>> + phy-irq-gpios = <&gpio2 10 GPIO_ACTIVE_LOW>;
>> +
>> + status = "okay";
>
> Don't should status in examples.
>
>> +};
Ok

Final result of new Patch, for bindings:

SMSC com20020 Arcnet network controller

Required propelty:
- timeout: Arcnet timeout
- smsc-clockp: Clock Prescaler
- smsc-clockm: Clock multiplier
- smsc-backplane: Controller use backplane mode inside of transceiver

- reset-gpios: Chip reset pin
- interrupts: Should contain controller interrupt

arcnet@...00000 {
     compatible = "smsc,com20020";

timeout = <0x3>;
smsc-backplane = <0x0>;
smsc-clockp = <0x0>;
smsc-clockm = <0x3>;

reset-gpios = <&gpio3 21 GPIO_ACTIVE_LOW>;
interrupts = <&gpio2 10 GPIO_ACTIVE_LOW>;
};

Andrea