linux-kernel - Re: [PATCH 3/6] gpio: dt-bindings: Add documentation for gpio controllers on Armada 7K/8K

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Date:   Wed, 31 May 2017 12:05:49 +0200
From:   Gregory CLEMENT <gregory.clement@...e-electrons.com>
To:     Rob Herring <robh@...nel.org>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Alexandre Courbot <gnurou@...il.com>,
        linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jason Cooper <jason@...edaemon.net>,
        Andrew Lunn <andrew@...n.ch>,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
        Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        Russell King <rmk+kernel@...linux.org.uk>,
        Nadav Haklai <nadavh@...vell.com>,
        Kostya Porotchkin <kostap@...vell.com>,
        Neta Zur Hershkovits <neta@...vell.com>,
        Marcin Wojtas <mw@...ihalf.com>,
        Omri Itach <omrii@...vell.com>,
        Shadi Ammouri <shadi@...vell.com>
Subject: Re: [PATCH 3/6] gpio: dt-bindings: Add documentation for gpio controllers on Armada 7K/8K

Hi Rob,
 
 On mer., mai 31 2017, Rob Herring <robh@...nel.org> wrote:
>>  
>>  Required properties:
>>  
>> -- compatible : Should be "marvell,orion-gpio", "marvell,mv78200-gpio"
>> -  or "marvell,armadaxp-gpio". "marvell,orion-gpio" should be used for
>> -  Orion, Kirkwood, Dove, Discovery (except MV78200) and Armada
>> -  370. "marvell,mv78200-gpio" should be used for the Discovery
>> -  MV78200. "marvel,armadaxp-gpio" should be used for all Armada XP
>> -  SoCs (MV78230, MV78260, MV78460).
>> +- compatible : Should be "marvell,orion-gpio", "marvell,mv78200-gpio",
>> +  "marvell,armadaxp-gpio" or "marvell,armada-8k-gpio".
>> +
>> +    "marvell,orion-gpio" should be used for Orion, Kirkwood, Dove,
>> +    Discovery (except MV78200) and Armada 370. "marvell,mv78200-gpio"
>> +    should be used for the Discovery MV78200.
>> +
>> +    "marvel,armadaxp-gpio" should be used for all Armada XP SoCs
>> +    (MV78230, MV78260, MV78460).
>> +
>> +    "marvell,armada-8k-gpio" should be used for the Armada 7K and 8K
>> +    SoCs (either from AP or CP), see
>> +    Documentation/devicetree/bindings/arm/marvell/cp110-system-controller0.txt
>> +    and
>> +    Documentation/devicetree/bindings/arm/marvell/ap806-system-controller.txt
>> +    for specific details about the offset property.
>>  
>>  - reg: Address and length of the register set for the device. Only one
>>    entry is expected, except for the "marvell,armadaxp-gpio" variant
>>    for which two entries are expected: one for the general registers,
>> -  one for the per-cpu registers.
>> +  one for the per-cpu registers. Not used for marvell,armada-8k-gpio.
>
> Why can't use you use reg instead of offset?

I looked for how the other syscon user did, and I found the offset
usage. So I assumed it was the way to do it. But if you wan I can use a
reg property.

Gregory

>
> Rob

-- 
Gregory Clement, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com