linux-kernel - Re: [linux-sunxi] Re: [PATCH v2] ARM: dts: sunxi: Add regulators for LeMaker BananaPi

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Message-ID: <56162A28.8000104@redhat.com>
Date:	Thu, 8 Oct 2015 09:32:40 +0100
From:	Hans de Goede <hdegoede@...hat.com>
To:	monnier@....umontreal.ca, linux-sunxi@...glegroups.com
Cc:	devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [linux-sunxi] Re: [PATCH v2] ARM: dts: sunxi: Add regulators for
 LeMaker BananaPi

Hi,

On 10/07/2015 05:01 PM, Stefan Monnier wrote:
>> @Maxime: How should we handle this? In its current form, the patch applies
>> only to the BananaPi dts by overriding the inherited opp from the SoC dtsi.
>> In an earlier discussion, it was said that this can be done, even though it
>> might not be the most elegant approach. But then again, I think it
>> shouldn't be necessary to change the opp in the sun7i-a20.dtsi for all A20
>> boards since this is - to my knowledge - the first and only report that an
>> A20 board has stability issues at the lower voltages (although not too many
>> boards use voltage scaling yet).
>
> IIUC this setting doesn't affect signals external to the A20, so it
> seems like it should be board-agnostic.

This setting configures the voltage at the pmic output pin, not at the SoC
power-input pins. And how much of the voltage actually makes it from the pmic
to the SoC definitely is board-specific. So we are going to need board-specific
opp-s in some cases (like this one for example).

Regards,

Hans
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