linux-kernel - Re: [PATCH v4 4/5] regulator: tps65912: Add regulator driver for the TPS65912 PMIC

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Date:	Tue, 10 Nov 2015 11:52:12 -0600
From:	"Andrew F. Davis" <afd@...com>
To:	Mark Brown <broonie@...nel.org>
CC:	Rob Herring <robh+dt@...nel.org>, Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Lee Jones <lee.jones@...aro.org>,
	Alexandre Courbot <gnurou@...il.com>,
	Grygorii Strashko <grygorii.strashko@...com>,
	<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 4/5] regulator: tps65912: Add regulator driver for the
 TPS65912 PMIC

On 11/10/2015 11:04 AM, Mark Brown wrote:
> On Tue, Nov 10, 2015 at 10:47:33AM -0600, Andrew F. Davis wrote:
>> On 11/10/2015 03:57 AM, Mark Brown wrote:
>
>>> Of course this is a negative review of the binding!  What on earth did
>>> you think my feedback meant?  The driver and the binding go together.
>
>> The bindings should be driver/platform/OS agnostic, changing the bindings
>> because the Linux regulator subsystem maintainer doesn't like them
>> in regulator drivers is then not correct.
>
>> If the binding is accepted then the regulator driver will just have
>> to deal with it, so as I said, why not nack the bindings patch, and
>> explain your objection where DT maintainers might see it.
>
> If I'm not going to merge the driver because of issues in the DT code it
> is vanishingly unlikely that I'm going to merge the regulator bindings
> either.  I would have thought it should be clear that my review comments
> cover both the manifestation of the bindings in the driver and the
> bindings themselves.
>

Kind of an interesting situation, if I didn't have the regulator as a separate
node like you want, then I wouldn't really need a separate regulator binding Doc,
for you to merge, it could all be merged as a single MFD binding.

Anyway, All I'm trying to do here is keep things clean in the DT. We only have
one consistent option:

Match all sub parts by compatible:

tps65912: tps65912@2d {
	compatible = "ti,tps65912";
	reg = <0x58>;
	interrupts ...

	regulator {
		compatible = "ti,tps65912-regulator";
		dcdc1 {
			regulator-name = "vdd_core";
			regulator-min-microvolt = <912000>;
			regulator-max-microvolt = <1144000>;
		};
		...
	};

	pwrbutton {
		compatible = "ti,palmas-pwrbutton";
		interrupt-parent = <&tps65912>;
		interrupts = <1 IRQ_TYPE_EDGE_FALLING>;
		wakeup-source;
		ti,palmas-long-press-seconds = <12>;
	};

	gpio {
		compatible = "ti,palmas-gpio";
		gpio-controller;
		#gpio-cells = <2>;
	};
	...
};

Or we end up with some hybrid approach, matching some on node name, others
on compatible when needed. Yes, the above matches Linux device model (still
not sure why that is such a problem?), but it also matches modular functionality
in the device.
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