linux-kernel - Re: [PATCH 4/4] arm: dts: zynq: Replace 'io-standard' with 'power-source' property

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Date:   Fri, 30 Jul 2021 14:46:24 +0200
From:   Michal Simek <michal.simek@...inx.com>
To:     Linus Walleij <linus.walleij@...aro.org>,
        Rob Herring <robh@...nel.org>
CC:     Sai Krishna Potthuri <lakshmi.sai.krishna.potthuri@...inx.com>,
        "Michal Simek" <michal.simek@...inx.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        git <git@...inx.com>, <saikrishna12468@...il.com>
Subject: Re: [PATCH 4/4] arm: dts: zynq: Replace 'io-standard' with
 'power-source' property



On 7/30/21 2:43 PM, Linus Walleij wrote:
> On Thu, Jul 29, 2021 at 9:59 PM Rob Herring <robh@...nel.org> wrote:
>> On Wed, Jul 21, 2021 at 05:22:33PM +0530, Sai Krishna Potthuri wrote:
>>> Replace 'io-standard' property with 'power-source' property in all zynq dts
>>> files to be in sync with Zynq pinctrl driver.
>>>
>>> Signed-off-by: Sai Krishna Potthuri <lakshmi.sai.krishna.potthuri@...inx.com>
>>> ---
>>>  arch/arm/boot/dts/zynq-ebaz4205.dts |  8 ++++----
>>>  arch/arm/boot/dts/zynq-microzed.dts |  2 +-
>>>  arch/arm/boot/dts/zynq-zc702.dts    | 20 ++++++++++----------
>>>  arch/arm/boot/dts/zynq-zc706.dts    | 18 +++++++++---------
>>>  4 files changed, 24 insertions(+), 24 deletions(-)
>>>
>>> diff --git a/arch/arm/boot/dts/zynq-ebaz4205.dts b/arch/arm/boot/dts/zynq-ebaz4205.dts
>>> index b0b836aedd76..be7eae611fb7 100644
>>> --- a/arch/arm/boot/dts/zynq-ebaz4205.dts
>>> +++ b/arch/arm/boot/dts/zynq-ebaz4205.dts
>>> @@ -57,7 +57,7 @@
>>>
>>>               conf {
>>>                       groups = "gpio0_20_grp", "gpio0_32_grp";
>>> -                     io-standard = <3>;
>>> +                     power-source = <3>;
>>
>> This will break using a new DT with a kernel without patch 3.
> 
> The old (Linux) kernel never supported the "io-standard" property
> anyway.
> 
> Unless someone is running som BSD or Windows with support for
> this property it can be merged by the quality of zero real-world
> impacts (no-one there to hear the tree fall in the forest).
> 
> Sai Krishna: correct?

Linux Zynq pinctrl driver and in tree dts files are using io-standard
properties at least from 2015.

M