linux-kernel - Re: [PATCH V2 6/6] pinctrl: tegra: Add complete device tree support

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Message-ID: <20120321093504.GA12118@shlinux2.ap.freescale.net>
Date:	Wed, 21 Mar 2012 17:35:06 +0800
From:	Dong Aisheng <aisheng.dong@...escale.com>
To:	Stephen Warren <swarren@...dotorg.org>
CC:	"linus.walleij@...aro.org" <linus.walleij@...aro.org>,
	"grant.likely@...retlab.ca" <grant.likely@...retlab.ca>,
	"rob.herring@...xeda.com" <rob.herring@...xeda.com>,
	"linus.walleij@...ricsson.com" <linus.walleij@...ricsson.com>,
	Dong Aisheng-B29396 <B29396@...escale.com>,
	"s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
	"dongas86@...il.com" <dongas86@...il.com>,
	"shawn.guo@...aro.org" <shawn.guo@...aro.org>,
	"thomas.abraham@...aro.org" <thomas.abraham@...aro.org>,
	"tony@...mide.com" <tony@...mide.com>,
	"sjg@...omium.org" <sjg@...omium.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>
Subject: Re: [PATCH V2 6/6] pinctrl: tegra: Add complete device tree support

On Wed, Mar 21, 2012 at 01:44:39AM +0800, Stephen Warren wrote:
> Implement pinctrl_ops dt_node_to_map() and dt_free_map(). These allow
> complete specification of the desired pinmux configuration using device
> tree.
> 
> Signed-off-by: Stephen Warren <swarren@...dotorg.org>
> ---
> v2: Rebase on of_property_for_each_string() API changes.
> ---
Nice code and a good example to people.

A small suggestion below:
> +static int add_map_configs(struct pinctrl_map **map, unsigned *num_maps,
> +			   const char *group, unsigned long *configs,
> +			   unsigned num_configs)
> +{
> +	unsigned i = *num_maps;
> +	unsigned long *dup_configs;
> +	int ret;
> +
> +	dup_configs = kmemdup(configs, num_configs * sizeof(*dup_configs),
> +			      GFP_KERNEL);
> +	if (!dup_configs)
> +		return -ENOMEM;
> +
> +	ret = add_map(map, num_maps);
> +	if (ret < 0)
> +		return ret;
> +
> +	(*map)[i].type = PIN_MAP_TYPE_CONFIGS_GROUP;
It still does not support PIN_MAP_TYPE_CONFIGS_PIN, right?

> +	for_each_child_of_node(np_config, np) {
> +		ret = of_property_read_string(np, "nvidia,function", &function);
> +		if (ret < 0)
> +			function = NULL;
> +
> +		for (i = 0; i < ARRAY_SIZE(cfg_params); i++) {
> +			ret = of_property_read_u32(np, cfg_params[i].property,
> +						   &val);
> +			if (!ret) {
> +				config = TEGRA_PINCONF_PACK(
> +						cfg_params[i].param, val);
> +				ret = add_config(&configs, &num_configs,
> +						 config);
> +				if (ret < 0)
> +					goto error;
> +			}
> +		}
> +
> +		of_property_for_each_string(np, "nvidia,pins", prop, group) {
If we calculate out the strings count and allocate corresponding size array, we may not
need to keep krealloc the maps and configs array size for each entry.
And this may be a little higher efficient.

Regards
Dong Aisheng

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