linux-kernel - Re: [PATCH 1/4] pinctrl: Add NVIDIA Tegra XUSB pad controller support

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Date:	Fri, 6 Jun 2014 00:09:28 +0200
From:	Thierry Reding <thierry.reding@...il.com>
To:	Stephen Warren <swarren@...dotorg.org>
Cc:	Linus Walleij <linus.walleij@...aro.org>,
	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>,
	Andrew Bresticker <abrestic@...omium.org>,
	devicetree@...r.kernel.org, linux-tegra@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] pinctrl: Add NVIDIA Tegra XUSB pad controller support

On Thu, Jun 05, 2014 at 11:08:54AM -0600, Stephen Warren wrote:
> On 06/04/2014 09:16 AM, Thierry Reding wrote:
> > From: Thierry Reding <treding@...dia.com>
> > 
> > The XUSB pad controller found on NVIDIA Tegra SoCs provides several pads
> > that lanes can be assigned to in order to support a variety of interface
> > options: USB 2.0, USB 3.0, PCIe and SATA.
> > 
> > In addition to the pin controller used to assign lanes to pads two PHYs
> > are exposed to allow the bricks for PCIe and SATA to be powered up and
> > down by PCIe and SATA drivers.
> 
> > +#define TEGRA124_GROUP(_funcs)						\
> > +	{								\
> > +		.num_funcs = ARRAY_SIZE(tegra124_##_funcs##_functions),	\
> > +		.funcs = tegra124_##_funcs##_functions,			\
> > +	}
> > +
> > +static const struct tegra_xusb_padctl_group tegra124_groups[] = {
> > +	TEGRA124_GROUP(otg),
> > +	TEGRA124_GROUP(usb),
> > +	TEGRA124_GROUP(pci),
> > +};
> 
> I'm not sure what this set of groups is for.
> 
> pinctrl muxes functions onto groups, so given that each pin in padctl is
> individually configurable, we need 1 group per pin. As far as I can
> tell, tegra_xusb_padctl_get_groups_count()/name() implement this
> correctly, and this array isn't used anywhere?

Indeed, there seems to be no need for this anymore. Probably left-over
from some prior version.

Thanks,
Thierry

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