linux-kernel - Re: [PATCH V3] ARM: dts: da850-evm: use phandles to extend nodes

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Date:   Thu, 10 May 2018 10:39:01 -0500
From:   Adam Ford <aford173@...il.com>
To:     Sekhar Nori <nsekhar@...com>
Cc:     Adam Ford <adam.ford@...icpd.com>,
        Kevin Hilman <khilman@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        arm-soc <linux-arm-kernel@...ts.infradead.org>,
        devicetree <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V3] ARM: dts: da850-evm: use phandles to extend nodes

On Thu, May 10, 2018 at 10:19 AM, Sekhar Nori <nsekhar@...com> wrote:
> On Thursday 10 May 2018 08:38 PM, Adam Ford wrote:
>> On Thu, May 10, 2018 at 4:10 AM, Sekhar Nori <nsekhar@...com> wrote:
>>> On Monday 07 May 2018 06:07 PM, Adam Ford wrote:
>>>> Many node labels in the device tree (like serial0, serial1, etc) are being
>>>> redefined, so let's modernize the device tree by using phandles to
>>>> extend the existing nodes.  This helps reduce the whitespace.
>>>>
>>>> Signed-off-by: Adam Ford <aford173@...il.com>
>>>
>>> I applied this without the pmic changes. I am not convinced about those.
>>> The tps node is already being referred to as phandle. I am not sure
>>> referring to each individual regulator using phandle is needed. Other
>>> files like am335x-evm.dts don't do it as well.
>>
>> I tested the regulator values and names after booting to see if the
>> names and values matched the expected values. They did, so I am
>> fairly confident it would have worked.
>
> Not doubting that. But I am not sure if thats the "norm". Do you see any
> other device-tree file doing this?

The omap3 boards do this.  For example, the beagle-xm board includes
the twl4030 files

#include "twl4030.dtsi"
#include "twl4030_omap3.dtsi"

These files setup the PMIC regulators, but the beagle-xm modifies the
PMIC settings phandles.

&vaux2 {
regulator-name = "usb_1v8";
regulator-min-microvolt = <1800000>;
regulator-max-microvolt = <1800000>;
regulator-always-on;
};

I was trying to mimic this behavior when I did it for the da850-evm,
however, it seems like a moot point we merge the
 tp6507x.dtsi contents into the da850-evm.dts.

>
>>
>>>
>>> Another thing is whether we really need the tp6507x.dtsi file. It does
>>> not seem to contain much and also da850-evm.dts is the only file
>>> including it. So it seems pretty pointless to me.
>>
>> Do you want me to do a patch that removes the  tp6507x.dtsi file and
>> just sets up the
>> PMIC from scratch within the da850-evm file?
>
> I am fine with the plan, but not something urgent, IMO.

I'm going to try and revisit the LCD again first, but I'll try to do
them both this weekend if I can get some time.

>
>>
>>>
>>> Here is what I committed.
>>
>> Thank you.  I think looks cleaner this way, and more consistent with
>> many of the other platforms and boards.
>
> Yes.
>
> Thanks,
> Sekhar

Thank you,

adam