linux-kernel - Re: [PATCH RFC 1/2] dt-bindings: simplefb: Support a list of regulator supply properties

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Date:	Wed, 14 Oct 2015 11:36:48 +0100
From:	Mark Brown <broonie@...nel.org>
To:	Hans de Goede <hdegoede@...hat.com>
Cc:	Chen-Yu Tsai <wens@...e.org>, Mark Rutland <mark.rutland@....com>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Tomi Valkeinen <tomi.valkeinen@...com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	"linux-fbdev@...r.kernel.org" <linux-fbdev@...r.kernel.org>,
	devicetree <devicetree@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH RFC 1/2] dt-bindings: simplefb: Support a list of
 regulator supply properties

On Tue, Oct 13, 2015 at 09:08:46AM +0200, Hans de Goede wrote:
> On 13-10-15 04:22, Chen-Yu Tsai wrote:
> >On Tue, Oct 13, 2015 at 1:10 AM, Mark Rutland <mark.rutland@....com> wrote:
> >>On Tue, Oct 13, 2015 at 01:04:17AM +0800, Chen-Yu Tsai wrote:

> >>>+- num-supplies : The number of regulators used by the framebuffer.
> >>>+- vinN-supply : The N-th (from 0) regulator used by the framebuffer.

> >>I don't see why you need num-supplies. Why not just try probing
> >>vin${N}-supply until such a property isn't present in the DT?

> +1 for this.

Even better would be to just enumerate all the properties on the node
and request anything with a FOO-supply name.  That way we can keep
using standard regulator bindings that name the supplies after their
actual names on the device.

> > That's doable. Though I'd add a hard limit on it. Does 16 seem
> > reasonable?

> I would not add a hard limit to the binding, you can use a fixed array in
> the code to make the code simpler. I would say 8 should be sufficient, since
> the limit will only be in the code we can always bump it when we need
> to.

Or just dynamically allocate the array and resize as needed if it starts
to get to be a problem.

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