Commit dd4d01f7 authored by Soren Brinkmann's avatar Soren Brinkmann Committed by Linus Walleij
Browse files

pinctrl: pinconf-generic: Allow driver to specify DT params 



Additionally to the generic DT parameters, allow drivers to provide
driver-specific DT parameters to be used with the generic parser
infrastructure.

To achieve this 'struct pinctrl_desc' is extended to pass custom pinconf
option to the core. In order to pass this kind of information, the
related data structures - 'struct pinconf_generic_dt_params',
'pin_config_item' - are moved from pinconf internals to the
pinconf-generic header.

Additionally pinconfg-generic is refactored to not only iterate over the
generic pinconf parameters but also take the parameters into account
that are provided through the driver's 'struct pinctrl_desc'.
In particular 'pinconf_generic_parse_dt_config()' and
'pinconf_generic_dump' helpers are split into two parts each. In order
to have a more generic helper that can be used to process the generic
parameters as well as the driver-specific ones.

v2:
 - fix typo
 - add missing documentation for @conf_items member in struct
 - rebase to pinctrl/devel: conflict in abx500
 - rename _pinconf_generic_dump() to pinconf_generic_dump_one()
 - removed '_' from _parse_dt_cfg()
 - removed BUG_ONs, error condition is handled in if statements
 - removed pinconf_generic_dump_group() & pinconf_generic_dump_pin
   helpers
   - fixed up corresponding call sites
   - renamed pinconf_generic_dump() to pinconf_generic_dump_pins()
   - added kernel-doc to pinconf_generic_dump_pins()
 - add kernel-doc
 - more verbose commit message

Signed-off-by: default avatarSoren Brinkmann <soren.brinkmann@xilinx.com>
Tested-by: default avatarAndreas Färber <afaerber@suse.de>
Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
parent 31c89c95

drivers/pinctrl/nomadik/pinctrl-abx500.c

+1 −1
Original line number Diff line number Diff line
@@ -914,7 +914,7 @@ static int abx500_dt_subnode_to_map(struct pinctrl_dev *pctldev, 
		}

	}



	ret = pinconf_generic_parse_dt_config(np, &configs, &nconfigs);

	ret = pinconf_generic_parse_dt_config(np, pctldev, &configs, &nconfigs);

	if (nconfigs) {

		const char *gpio_name;

		const char *pin;

drivers/pinctrl/pinconf-generic.c

+100 −82
Original line number Diff line number Diff line
@@ -27,17 +27,6 @@ 
#include "pinctrl-utils.h"



#ifdef CONFIG_DEBUG_FS



struct pin_config_item {

	const enum pin_config_param param;

	const char * const display;

	const char * const format;

	bool has_arg;

};



#define PCONFDUMP(a, b, c, d) { .param = a, .display = b, .format = c, \

				.has_arg = d }



static const struct pin_config_item conf_items[] = {

	PCONFDUMP(PIN_CONFIG_BIAS_DISABLE, "input bias disabled", NULL, false),

	PCONFDUMP(PIN_CONFIG_BIAS_HIGH_IMPEDANCE, "input bias high impedance", NULL, false),
@@ -60,21 +49,24 @@ static const struct pin_config_item conf_items[] = { 
	PCONFDUMP(PIN_CONFIG_OUTPUT, "pin output", "level", true),

};



void pinconf_generic_dump_pin(struct pinctrl_dev *pctldev,

			      struct seq_file *s, unsigned pin)

static void pinconf_generic_dump_one(struct pinctrl_dev *pctldev,

				     struct seq_file *s, const char *gname,

				     unsigned pin,

				     const struct pin_config_item *items,

				     int nitems)

{

	const struct pinconf_ops *ops = pctldev->desc->confops;

	int i;



	if (!ops->is_generic)

		return;



	for (i = 0; i < ARRAY_SIZE(conf_items); i++) {

	for (i = 0; i < nitems; i++) {

		unsigned long config;

		int ret;



		/* We want to check out this parameter */

		config = pinconf_to_config_packed(conf_items[i].param, 0);

		config = pinconf_to_config_packed(items[i].param, 0);

		if (gname)

			ret = pin_config_group_get(dev_name(pctldev->dev),

						   gname, &config);

		else

			ret = pin_config_get_for_pin(pctldev, pin, &config);

		/* These are legal errors */

		if (ret == -EINVAL || ret == -ENOTSUPP)
@@ -85,56 +77,46 @@ void pinconf_generic_dump_pin(struct pinctrl_dev *pctldev, 
		}

		/* Space between multiple configs */

		seq_puts(s, " ");

		seq_puts(s, conf_items[i].display);

		seq_puts(s, items[i].display);

		/* Print unit if available */

		if (conf_items[i].has_arg) {

		if (items[i].has_arg) {

			seq_printf(s, " (%u",

				   pinconf_to_config_argument(config));

			if (conf_items[i].format)

				seq_printf(s, " %s)", conf_items[i].format);

			if (items[i].format)

				seq_printf(s, " %s)", items[i].format);

			else

				seq_puts(s, ")");

		}

	}

}



void pinconf_generic_dump_group(struct pinctrl_dev *pctldev,

			      struct seq_file *s, const char *gname)

/**

 * pinconf_generic_dump_pins - Print information about pin or group of pins

 * @pctldev:	Pincontrol device

 * @s:		File to print to

 * @gname:	Group name specifying pins

 * @pin:	Pin number specyfying pin

 *

 * Print the pinconf configuration for the requested pin(s) to @s. Pins can be

 * specified either by pin using @pin or by group using @gname. Only one needs

 * to be specified the other can be NULL/0.

 */

void pinconf_generic_dump_pins(struct pinctrl_dev *pctldev, struct seq_file *s,

			       const char *gname, unsigned pin)

{

	const struct pinconf_ops *ops = pctldev->desc->confops;

	int i;



	if (!ops->is_generic)

		return;



	for (i = 0; i < ARRAY_SIZE(conf_items); i++) {

		unsigned long config;

		int ret;



		/* We want to check out this parameter */

		config = pinconf_to_config_packed(conf_items[i].param, 0);

		ret = pin_config_group_get(dev_name(pctldev->dev), gname,

					   &config);

		/* These are legal errors */

		if (ret == -EINVAL || ret == -ENOTSUPP)

			continue;

		if (ret) {

			seq_printf(s, "ERROR READING CONFIG SETTING %d ", i);

			continue;

		}

		/* Space between multiple configs */

		seq_puts(s, " ");

		seq_puts(s, conf_items[i].display);

		/* Print unit if available */

		if (conf_items[i].has_arg) {

			seq_printf(s, " (%u",

				   pinconf_to_config_argument(config));

			if (conf_items[i].format)

				seq_printf(s, " %s)", conf_items[i].format);

			else

				seq_puts(s, ")");

		}

	}

	/* generic parameters */

	pinconf_generic_dump_one(pctldev, s, gname, pin, conf_items,

				 ARRAY_SIZE(conf_items));

	/* driver-specific parameters */

	if (pctldev->desc->num_dt_params && pctldev->desc->conf_items)

		pinconf_generic_dump_one(pctldev, s, gname, pin,

					 pctldev->desc->conf_items,

					 pctldev->desc->num_dt_params);

}



void pinconf_generic_dump_config(struct pinctrl_dev *pctldev,
@@ -148,17 +130,21 @@ void pinconf_generic_dump_config(struct pinctrl_dev *pctldev, 
		seq_printf(s, "%s: 0x%x", conf_items[i].display,

			   pinconf_to_config_argument(config));

	}



	if (!pctldev->desc->num_dt_params || !pctldev->desc->conf_items)

		return;



	for (i = 0; i < pctldev->desc->num_dt_params; i++) {

		if (pinconf_to_config_param(config) != pctldev->desc->conf_items[i].param)

			continue;

		seq_printf(s, "%s: 0x%x", pctldev->desc->conf_items[i].display,

			   pinconf_to_config_argument(config));

	}

}

EXPORT_SYMBOL_GPL(pinconf_generic_dump_config);

#endif



#ifdef CONFIG_OF

struct pinconf_generic_dt_params {

	const char * const property;

	enum pin_config_param param;

	u32 default_value;

};



static const struct pinconf_generic_dt_params dt_params[] = {

	{ "bias-disable", PIN_CONFIG_BIAS_DISABLE, 0 },

	{ "bias-high-impedance", PIN_CONFIG_BIAS_HIGH_IMPEDANCE, 0 },
@@ -183,6 +169,47 @@ static const struct pinconf_generic_dt_params dt_params[] = { 
	{ "slew-rate", PIN_CONFIG_SLEW_RATE, 0},

};



/**

 * parse_dt_cfg - Parse DT pinconf parameters

 * @np:	DT node

 * @params:	Array of describing DT parameters

 * @count:	Number of entries in @params

 * @cfg:	Array of parsed config options

 * @ncfg:	Number of entries in @cfg

 *

 * Parse the config options described in @params from @np and puts the result

 * in @cfg. @cfg does not need to be empty, entries are added beggining at

 * @ncfg. @ncfg is updated to reflect the number of entries after parsing. @cfg

 * needs to have enough memory allocated to hold all possible entries.

 */

static void parse_dt_cfg(struct device_node *np,

			 const struct pinconf_generic_dt_params *params,

			 unsigned int count, unsigned long *cfg,

			 unsigned int *ncfg)

{

	int i;



	for (i = 0; i < count; i++) {

		u32 val;

		int ret;

		const struct pinconf_generic_dt_params *par = &params[i];



		ret = of_property_read_u32(np, par->property, &val);



		/* property not found */

		if (ret == -EINVAL)

			continue;



		/* use default value, when no value is specified */

		if (ret)

			val = par->default_value;



		pr_debug("found %s with value %u\n", par->property, val);

		cfg[*ncfg] = pinconf_to_config_packed(par->param, val);

		(*ncfg)++;

	}

}



/**

 * pinconf_generic_parse_dt_config()

 * parse the config properties into generic pinconfig values.
@@ -191,39 +218,29 @@ static const struct pinconf_generic_dt_params dt_params[] = { 
 * @nconfigs: umber of configurations

 */

int pinconf_generic_parse_dt_config(struct device_node *np,

				    struct pinctrl_dev *pctldev,

				    unsigned long **configs,

				    unsigned int *nconfigs)

{

	unsigned long *cfg;

	unsigned int ncfg = 0;

	unsigned int max_cfg, ncfg = 0;

	int ret;

	int i;

	u32 val;



	if (!np)

		return -EINVAL;



	/* allocate a temporary array big enough to hold one of each option */

	cfg = kzalloc(sizeof(*cfg) * ARRAY_SIZE(dt_params), GFP_KERNEL);

	max_cfg = ARRAY_SIZE(dt_params);

	if (pctldev)

		max_cfg += pctldev->desc->num_dt_params;

	cfg = kcalloc(max_cfg, sizeof(*cfg), GFP_KERNEL);

	if (!cfg)

		return -ENOMEM;



	for (i = 0; i < ARRAY_SIZE(dt_params); i++) {

		const struct pinconf_generic_dt_params *par = &dt_params[i];

		ret = of_property_read_u32(np, par->property, &val);



		/* property not found */

		if (ret == -EINVAL)

			continue;



		/* use default value, when no value is specified */

		if (ret)

			val = par->default_value;



		pr_debug("found %s with value %u\n", par->property, val);

		cfg[ncfg] = pinconf_to_config_packed(par->param, val);

		ncfg++;

	}

	parse_dt_cfg(np, dt_params, ARRAY_SIZE(dt_params), cfg, &ncfg);

	if (pctldev && pctldev->desc->num_dt_params && pctldev->desc->params)

		parse_dt_cfg(np, pctldev->desc->params,

			      pctldev->desc->num_dt_params, cfg, &ncfg);



	ret = 0;
@@ -274,7 +291,8 @@ int pinconf_generic_dt_subnode_to_map(struct pinctrl_dev *pctldev, 
		function = NULL;

	}



	ret = pinconf_generic_parse_dt_config(np, &configs, &num_configs);

	ret = pinconf_generic_parse_dt_config(np, pctldev, &configs,

					      &num_configs);

	if (ret < 0) {

		dev_err(dev, "could not parse node property\n");

		return ret;

drivers/pinctrl/pinconf.c

+2 −2
Original line number Diff line number Diff line
@@ -288,7 +288,7 @@ static void pinconf_dump_pin(struct pinctrl_dev *pctldev, 
	const struct pinconf_ops *ops = pctldev->desc->confops;



	/* no-op when not using generic pin config */

	pinconf_generic_dump_pin(pctldev, s, pin);

	pinconf_generic_dump_pins(pctldev, s, NULL, pin);

	if (ops && ops->pin_config_dbg_show)

		ops->pin_config_dbg_show(pctldev, s, pin);

}
@@ -333,7 +333,7 @@ static void pinconf_dump_group(struct pinctrl_dev *pctldev, 
	const struct pinconf_ops *ops = pctldev->desc->confops;



	/* no-op when not using generic pin config */

	pinconf_generic_dump_group(pctldev, s, gname);

	pinconf_generic_dump_pins(pctldev, s, gname, 0);

	if (ops && ops->pin_config_group_dbg_show)

		ops->pin_config_group_dbg_show(pctldev, s, selector);

}

drivers/pinctrl/pinconf.h

+7 −15
Original line number Diff line number Diff line
@@ -92,26 +92,17 @@ static inline void pinconf_init_device_debugfs(struct dentry *devroot, 


#if defined(CONFIG_GENERIC_PINCONF) && defined(CONFIG_DEBUG_FS)



void pinconf_generic_dump_pin(struct pinctrl_dev *pctldev,

			      struct seq_file *s, unsigned pin);



void pinconf_generic_dump_group(struct pinctrl_dev *pctldev,

			      struct seq_file *s, const char *gname);

void pinconf_generic_dump_pins(struct pinctrl_dev *pctldev,

			       struct seq_file *s, const char *gname,

			       unsigned pin);



void pinconf_generic_dump_config(struct pinctrl_dev *pctldev,

				 struct seq_file *s, unsigned long config);

#else



static inline void pinconf_generic_dump_pin(struct pinctrl_dev *pctldev,

					    struct seq_file *s,

					    unsigned pin)

{

	return;

}



static inline void pinconf_generic_dump_group(struct pinctrl_dev *pctldev,

static inline void pinconf_generic_dump_pins(struct pinctrl_dev *pctldev,

					     struct seq_file *s,

					      const char *gname)

					     const char *gname, unsigned pin)

{

	return;

}
@@ -126,6 +117,7 @@ static inline void pinconf_generic_dump_config(struct pinctrl_dev *pctldev, 


#if defined(CONFIG_GENERIC_PINCONF) && defined(CONFIG_OF)

int pinconf_generic_parse_dt_config(struct device_node *np,

				    struct pinctrl_dev *pctldev,

				    unsigned long **configs,

				    unsigned int *nconfigs);

#endif

drivers/pinctrl/pinctrl-rockchip.c

+1 −1
Original line number Diff line number Diff line
@@ -1140,7 +1140,7 @@ static int rockchip_pinctrl_parse_groups(struct device_node *np, 
			return -EINVAL;



		np_config = of_find_node_by_phandle(be32_to_cpup(phandle));

		ret = pinconf_generic_parse_dt_config(np_config,

		ret = pinconf_generic_parse_dt_config(np_config, NULL,

				&grp->data[j].configs, &grp->data[j].nconfigs);

		if (ret)

			return ret;

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