linux-kernel - Re: [PATCH v2] arm, am335x: add support for the bosch shc board

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Message-ID: <565D3997.9060905@denx.de>
Date:	Tue, 1 Dec 2015 07:09:27 +0100
From:	Heiko Schocher <hs@...x.de>
To:	Tony Lindgren <tony@...mide.com>
Cc:	linux-kernel@...r.kernel.org,
	Benoît Cousson <bcousson@...libre.com>,
	Robert Nelson <robertcnelson@...il.com>,
	devicetree@...r.kernel.org, Dave Gerlach <d-gerlach@...com>,
	Georg.Soffel@...ch-si.com, linux-omap@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	Mark Brown <broonie@...nel.org>
Subject: Re: [PATCH v2] arm, am335x: add support for the bosch shc board

Hello Tony,

Am 01.12.2015 um 06:53 schrieb Tony Lindgren:
> * Heiko Schocher <hs@...x.de> [151130 21:21]:
>> Hello Tony,
>>
>> Am 30.11.2015 um 22:41 schrieb Tony Lindgren:
>>> * Heiko Schocher <hs@...x.de> [151117 00:25]:
>>>> --- /dev/null
>>>> +++ b/arch/arm/boot/dts/am335x-shc.dts
>>>> +&tps {
>>>> +	compatible = "ti,tps65217";
>>>> +	ti,pmic-shutdown-controller;
>>>> +
>>>> +	regulators {
>>>> +		#address-cells = <1>;
>>>> +		#size-cells = <0>;
>>>> +
>>>> +		dcdc1_reg: regulator@0 {
>>>> +			reg = <0>;
>>>> +			regulator-name = "vdds_dpr";
>>>> +			regulator-compatible = "dcdc1";
>>>> +			regulator-min-microvolt = <1300000>;
>>>> +			regulator-max-microvolt = <1450000>;
>>>> +			regulator-boot-on;
>>>> +			regulator-always-on;
>>>> +		};
>>>> +
>>>> +		dcdc2_reg: regulator@1 {
>>>> +			reg = <1>;
>>>> +			/*
>>>> +			 * VDD_MPU voltage limits 0.95V - 1.26V with
>>>> +			 * +/-4% tolerance
>>>> +			 */
>>>> +			regulator-compatible = "dcdc2";
>>>> +			regulator-name = "vdd_mpu";
>>>> +			regulator-min-microvolt = <925000>;
>>>> +			regulator-max-microvolt = <1375000>;
>>>> +			regulator-boot-on;
>>>> +			regulator-always-on;
>>>> +			regulator-ramp-delay = <70000>;
>>>> +		};
>>>> +
>>>> +		dcdc3_reg: regulator@2 {
>>>> +			reg = <2>;
>>>> +			/*
>>>> +			 * VDD_CORE voltage limits 0.95V - 1.1V with
>>>> +			 * +/-4% tolerance
>>>> +			 */
>>>> +			regulator-name = "vdd_core";
>>>> +			regulator-compatible = "dcdc3";
>>>> +			regulator-min-microvolt = <925000>;
>>>> +			regulator-max-microvolt = <1125000>;
>>>> +			regulator-boot-on;
>>>> +			regulator-always-on;
>>>> +		};
>>>> +
>>>> +		ldo1_reg: regulator@3 {
>>>> +			reg = <3>;
>>>> +			regulator-name = "vio,vrtc,vdds";
>>>> +			regulator-compatible = "ldo1";
>>>> +			regulator-min-microvolt = <1000000>;
>>>> +			regulator-max-microvolt = <1800000>;
>>>> +			regulator-always-on;
>>>> +		};
>>>> +
>>>> +		ldo2_reg: regulator@4 {
>>>> +			reg = <4>;
>>>> +			regulator-name = "vdd_3v3aux";
>>>> +			regulator-compatible = "ldo2";
>>>> +			regulator-min-microvolt = <900000>;
>>>> +			regulator-max-microvolt = <3300000>;
>>>> +			regulator-always-on;
>>>> +		};
>>>> +
>>>> +		ldo3_reg: regulator@5 {
>>>> +			reg = <5>;
>>>> +			regulator-name = "vdd_1v8";
>>>> +			regulator-compatible = "ldo3";
>>>> +			regulator-min-microvolt = <900000>;
>>>> +			regulator-max-microvolt = <1800000>;
>>>> +			regulator-always-on;
>>>> +		};
>>>> +
>>>> +		ldo4_reg: regulator@6 {
>>>> +			reg = <6>;
>>>> +			regulator-name = "vdd_3v3a";
>>>> +			regulator-compatible = "ldo4";
>>>> +			regulator-min-microvolt = <1800000>;
>>>> +			regulator-max-microvolt = <3300000>;
>>>> +			regulator-always-on;
>>>> +		};
>>>> +	};
>>>> +};
>>>
>>> Applying this into omap-for-v4.5/dt.. But I'm getting concerned about this
>>> "regulator-always-on" stuff and having multiple copies of the same thing.
>>>
>>> I think we should have a common am33xx-tps65217.dtsi file that has the
>>> regulators defined at one place and other then include it. And they are
>>> controllable AFAIK..
>>
>> Hmm... Mark Brown (added to Cc) suggested to move this regulator nodes
>> into the board DT file and remove such files [1].
>
> Hmm it was probably the name of that file causing confusion as it was not
> am33xx specific. If we have many board variants using almost the same exact
> regulators and configuration it totally makes sense to have a shared dtsi
> file for them :)

Ack.

> It may actually be better to have it as am33xx-common.dtsi and I bet that
> covers quite a few am33xx boards for the basic shared functionality.

I try to find some time to make such a patch...

bye,
Heiko
>
> Regards,
>
> Tony
>
>
>> [1] https://lkml.org/lkml/2015/10/21/581
>

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