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

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Date:	Sat, 13 Aug 2011 11:43:23 +0100
From:	Jamie Iles <jamie@...ieiles.com>
To:	Stephen Warren <swarren@...dia.com>
Cc:	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

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.

Jamie
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