linux-kernel - Re: [PATCH v2 05/13] ARM: dts: db600c: add pmic regulator supplies

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Date:	Fri, 22 Apr 2016 10:11:55 +0100
From:	Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:	Stephen Boyd <sboyd@...eaurora.org>,
	Andy Gross <andy.gross@...aro.org>,
	linux-arm-msm@...r.kernel.org
Cc:	devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, linux-soc@...r.kernel.org
Subject: Re: [PATCH v2 05/13] ARM: dts: db600c: add pmic regulator supplies



On 19/04/16 20:10, Stephen Boyd wrote:
> On 04/12/2016 02:33 AM, Srinivas Kandagatla wrote:
>> This patch adds pmic regulator supplies connected on the board.
>> Rest of the invidual regulators would be added as and when required by
>> the devices.
>>
>> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
>> Acked-by: Bjorn Andersson <bjorn.andersson@...aro.org>
>> ---
>>   arch/arm/boot/dts/qcom-apq8064-arrow-db600c.dts | 62 +++++++++++++++++++++++++
>>   1 file changed, 62 insertions(+)
>>
>> diff --git a/arch/arm/boot/dts/qcom-apq8064-arrow-db600c.dts b/arch/arm/boot/dts/qcom-apq8064-arrow-db600c.dts
>> index 57d4500..6695b00 100644
>> --- a/arch/arm/boot/dts/qcom-apq8064-arrow-db600c.dts
>> +++ b/arch/arm/boot/dts/qcom-apq8064-arrow-db600c.dts
>> @@ -9,7 +9,69 @@
>>   		serial1 = &gsbi1_serial;
>>   	};
>>
>> +	regulators {
>> +		compatible = "simple-bus";
>> +		vph: regulator-fixed@1 {
>> +			compatible = "regulator-fixed";
>> +			regulator-min-microvolt = <4500000>;
>> +			regulator-max-microvolt = <4500000>;
>> +			regulator-name = "VPH";
>> +			regulator-type = "voltage";
>> +			regulator-boot-on;
>> +		};
>> +	};
>
> Just curious why we added the vph supply? Is that for some framework
> requirement? We haven't done this on other boards, although we probably
> should if there's a good reason for it.

This is an on board 12V TO 4.5V @5.5A DC/DC convertor for PMIC VPH 
power. Yep we should do something similar on the other boards too. 
Without this probably you would notice some error messages from 
rpm_regulators about missing supply nodes.


thanks,
srini



>