linux-kernel - Re: [PATCH 2/4] soc: qcom: Add GSBI driver

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Message-ID: <20140421172606.GB11778@joshc.qualcomm.com>
Date:	Mon, 21 Apr 2014 12:26:06 -0500
From:	Josh Cartwright <joshc@...eaurora.org>
To:	Andy Gross <agross@...eaurora.org>
Cc:	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-arm-msm@...r.kernel.org, Kumar Gala <galak@...eaurora.org>,
	Santosh Shilimkar <santosh.shilimkar@...com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH 2/4] soc: qcom: Add GSBI driver

On Mon, Apr 21, 2014 at 12:11:18PM -0500, Andy Gross wrote:
> On Mon, Apr 21, 2014 at 11:54:00AM -0500, Josh Cartwright wrote:
> > > +	if (of_property_read_u32(node, "qcom,mode", &mode)) {
> > > +		dev_err(gsbi->dev, "missing mode configuration\n");
> > > +		return -EINVAL;
> > > +	}
> > 
> > I'm wondering if you should really be a (very simple) pinctrl driver
> > proper.
> 
> Perhaps.  But how would i reconcile more than one device node that uses the same
> GSBI?  One could still trounce the other unless I only allow one setting of the
> GSBI.
> 

I don't understand, as long as the pins/functions have been specified
properly to the pinctrl core, I would expect a conflicting configuration
to be rejected.

Anyway, I wouldn't expect the subnodes to be consuming the GSBI pin
configuration anyway (although that could probably be done), instead, I
would expect the GSBI node to consume it's own pin configuration.

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