linux-kernel - Re: [RFC PATCH 10/12] arm/tegra: Add device tree support to pinmux driver

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Message-ID: <20110813104850.GD2643@pulham.picochip.com>
Date:	Sat, 13 Aug 2011 11:48:50 +0100
From:	Jamie Iles <jamie@...ieiles.com>
To:	Jamie Iles <jamie@...ieiles.com>
Cc:	Stephen Warren <swarren@...dia.com>,
	Grant Likely <grant.likely@...retlab.ca>,
	Colin Cross <ccross@...roid.com>,
	Erik Gilling <konkers@...roid.com>,
	Olof Johansson <olof@...om.net>,
	Russell King <linux@....linux.org.uk>,
	devicetree-discuss@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	linux-tegra@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [RFC PATCH 10/12] arm/tegra: Add device tree support to pinmux
 driver

On Sat, Aug 13, 2011 at 11:43:23AM +0100, Jamie Iles wrote:
> Hi Stephen,
> 
> On Fri, Aug 12, 2011 at 04:54:55PM -0600, Stephen Warren wrote:
> > Signed-off-by: Stephen Warren <swarren@...dia.com>
> > ---
> >  arch/arm/mach-tegra/pinmux.c |  115 ++++++++++++++++++++++++++++++++++++++++++
> >  1 files changed, 115 insertions(+), 0 deletions(-)
> > 
> > diff --git a/arch/arm/mach-tegra/pinmux.c b/arch/arm/mach-tegra/pinmux.c
> > index 05fa1a3..33246c2 100644
> > --- a/arch/arm/mach-tegra/pinmux.c
> > +++ b/arch/arm/mach-tegra/pinmux.c
> > @@ -20,6 +20,7 @@
> >  #include <linux/errno.h>
> >  #include <linux/spinlock.h>
> >  #include <linux/io.h>
> > +#include <linux/of.h>
> >  #include <linux/platform_device.h>
> >  
> >  #include <mach/iomap.h>
> > @@ -147,6 +148,41 @@ static const char *func_name(enum tegra_mux_func func)
> >  	return tegra_mux_names[func];
> >  }
> >  
> > +#ifdef CONFIG_OF
> > +static int func_enum(const char *name, enum tegra_mux_func *func_out)
> > +{
> > +	int func;
> > +
> > +	if (!strcmp(name, "RSVD1")) {
> > +		*func_out = TEGRA_MUX_RSVD1;
> > +		return 0;
> > +	}
> > +	if (!strcmp(name, "RSVD2")) {
> > +		*func_out = TEGRA_MUX_RSVD2;
> > +		return 0;
> > +	}
> > +	if (!strcmp(name, "RSVD3")) {
> > +		*func_out = TEGRA_MUX_RSVD3;
> > +		return 0;
> > +	}
> > +	if (!strcmp(name, "RSVD4")) {
> > +		*func_out = TEGRA_MUX_RSVD4;
> > +		return 0;
> > +	}
> > +	if (!strcmp(name, "NONE")) {
> > +		*func_out = TEGRA_MUX_NONE;
> > +		return 0;
> > +	}
> > +
> > +	for (func = 0; func < TEGRA_MAX_MUX; func++)
> > +		if (!strcmp(name, tegra_mux_names[func])) {
> > +			*func_out = func;
> > +			return 0;
> > +		}
> > +
> > +	return -EINVAL;
> > +}
> > +#endif
> >  
> >  static const char *tri_name(unsigned long val)
> >  {
> > @@ -666,15 +702,94 @@ void tegra_pinmux_config_pullupdown_table(const struct tegra_pingroup_config *co
> >  	}
> >  }
> >  
> > +#ifdef CONFIG_OF
> > +static void __init tegra_pinmux_probe_dt(struct platform_device *pdev)
> > +{
> > +	int pg;
> > +
> > +	for (pg = 0; pg < TEGRA_MAX_PINGROUP; pg++) {
> > +		const char *pg_name = pingroup_name(pg);
> > +		struct tegra_pingroup_config config;
> > +		struct device_node *pg_node;
> > +		int ret;
> > +		const char *s;
> > +
> > +		pg_node = of_find_child_node_by_name(pdev->dev.of_node,
> > +						     pg_name);
> > +		if (pg_node == NULL)
> > +			continue;
> 
> Rather than iterating over all of the mux names in the pinmux driver and 
> searching for a matching DT node, could you not do it the other way 
> round?  So do an for_each_child_of_node() on the pinmux node then find 
> the matching pingroup keyed by the node name?  This would eliminate 
> of_find_child_node_by_name().  You could also catch invalid 
> configurations for non-existent pins this way.

I just re-read your introduction email and saw you've already discussed 
this!  Would this require an explicit pin name property though or could 
you just key off of the pg_node->name?

Jamie
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