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From: Ahmad Fatoum <a.fatoum@pengutronix.de>
To: barebox@lists.infradead.org
Subject: Re: [PATCH] ARM: dts: imx6qdl: phycore: Remove emmc vmmc-supply
Date: Thu, 5 Dec 2019 09:37:44 +0100	[thread overview]
Message-ID: <67c1cd67-9156-9e43-2be4-b3502877d95f@pengutronix.de> (raw)
In-Reply-To: <20191205080755.nc2ao3hjb5eli7ud@pengutronix.de>

Hello,

On 12/5/19 9:07 AM, Sascha Hauer wrote:
> On Tue, Dec 03, 2019 at 02:48:41PM +0100, Stefan Riedmueller wrote:
>> There is no driver for the eMMC's vmmc-supply regulator in the barebox.
>> Use a dummy regulator instead by simply deleting the vmmc-supply
>> property.
>>
>> Signed-off-by: Stefan Riedmueller <s.riedmueller@phytec.de>
>> ---
>>  arch/arm/dts/imx6qdl-phytec-phycore-som.dtsi | 1 +
>>  1 file changed, 1 insertion(+)
>>
>> diff --git a/arch/arm/dts/imx6qdl-phytec-phycore-som.dtsi b/arch/arm/dts/imx6qdl-phytec-phycore-som.dtsi
>> index 69f252b42382..974e271f453d 100644
>> --- a/arch/arm/dts/imx6qdl-phytec-phycore-som.dtsi
>> +++ b/arch/arm/dts/imx6qdl-phytec-phycore-som.dtsi
>> @@ -112,6 +112,7 @@
>>  };
>>  
>>  &usdhc4 {
>> +	/delete-property/ vmmc-supply;
> 
> I don't like this approach very much. It's fine for barebox, but leads
> to problems once you start Linux with the barebox device tree. I'd
> rather go with the unmodified device trees (apart from the things
> barebox changes to the device trees in order to start Linux).

How about a barebox,regulator-always-on property? If the regulator is unnecessary,
it basically means you can assume it's always on when barebox runs.

If regulator_get is called with a property that points to such a node, a dummy
regulator is returned with which enable is a no-op. Additionally, do the same
for regulator-always-on, so the in-barebox device tree only needs to mark
non regulator-always-on that are expected to be always on when it runs due to
strapping/fuses as barebox,regulator-always-on.

Thoughts?
Ahmad

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  reply	other threads:[~2019-12-05  8:37 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-03 13:48 Stefan Riedmueller
2019-12-05  8:07 ` Sascha Hauer
2019-12-05  8:37   ` Ahmad Fatoum [this message]
2019-12-05 13:08     ` Stefan Riedmüller
2019-12-05 13:31       ` Ahmad Fatoum
2019-12-06 14:23         ` Sascha Hauer

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