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// SPDX-License-Identifier: GPL-2.0-only
#define pr_fmt(fmt) "generic pinconfig core: " fmt
#include <linux/array_size.h>
#include <linux/device.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/slab.h>
#include <linux/pinctrl/pinconf-generic.h>
#include <linux/pinctrl/pinconf.h>
#include <linux/pinctrl/pinctrl.h>
#include "core.h"
#include "pinconf.h"
#include "pinctrl-utils.h"
#include "pinmux.h"
static int pinctrl_generic_pins_function_dt_subnode_to_map(struct pinctrl_dev *pctldev,
struct device_node *parent,
struct device_node *np,
struct pinctrl_map **maps,
unsigned int *num_maps,
unsigned int *num_reserved_maps,
const char **group_names,
unsigned int ngroups)
{
struct device *dev = pctldev->dev;
const char **functions;
const char *group_name;
unsigned long *configs;
unsigned int num_configs, pin, *pins;
int npins, ret, reserve = 1;
npins = of_property_count_u32_elems(np, "pins");
if (npins < 1) {
dev_err(dev, "invalid pinctrl group %pOFn.%pOFn %d\n",
parent, np, npins);
return npins;
}
group_name = devm_kasprintf(dev, GFP_KERNEL, "%pOFn.%pOFn", parent, np);
if (!group_name)
return -ENOMEM;
group_names[ngroups] = group_name;
pins = devm_kcalloc(dev, npins, sizeof(*pins), GFP_KERNEL);
if (!pins)
return -ENOMEM;
functions = devm_kcalloc(dev, npins, sizeof(*functions), GFP_KERNEL);
if (!functions)
return -ENOMEM;
for (int i = 0; i < npins; i++) {
ret = of_property_read_u32_index(np, "pins", i, &pin);
if (ret)
return ret;
pins[i] = pin;
ret = of_property_read_string(np, "function", &functions[i]);
if (ret)
return ret;
}
ret = pinctrl_utils_reserve_map(pctldev, maps, num_reserved_maps, num_maps, reserve);
if (ret)
return ret;
ret = pinctrl_utils_add_map_mux(pctldev, maps, num_reserved_maps, num_maps, group_name,
parent->name);
if (ret < 0)
return ret;
ret = pinctrl_generic_add_group(pctldev, group_name, pins, npins, functions);
if (ret < 0)
return dev_err_probe(dev, ret, "failed to add group %s: %d\n",
group_name, ret);
ret = pinconf_generic_parse_dt_config(np, pctldev, &configs, &num_configs);
if (ret)
return dev_err_probe(dev, ret, "failed to parse pin config of group %s\n",
group_name);
if (num_configs == 0)
return 0;
ret = pinctrl_utils_reserve_map(pctldev, maps, num_reserved_maps, num_maps, reserve);
if (ret)
return ret;
ret = pinctrl_utils_add_map_configs(pctldev, maps, num_reserved_maps, num_maps, group_name,
configs,
num_configs, PIN_MAP_TYPE_CONFIGS_GROUP);
kfree(configs);
if (ret)
return ret;
return 0;
};
/*
* For platforms that do not define groups or functions in the driver, but
* instead use the devicetree to describe them. This function will, unlike
* pinconf_generic_dt_node_to_map() etc which rely on driver defined groups
* and functions, create them in addition to parsing pinconf properties and
* adding mappings.
*/
int pinctrl_generic_pins_function_dt_node_to_map(struct pinctrl_dev *pctldev,
struct device_node *np,
struct pinctrl_map **maps,
unsigned int *num_maps)
{
struct device *dev = pctldev->dev;
struct device_node *child_np;
const char **group_names;
unsigned int num_reserved_maps = 0;
int ngroups = 0;
int ret;
*maps = NULL;
*num_maps = 0;
/*
* Check if this is actually the pins node, or a parent containing
* multiple pins nodes.
*/
if (!of_property_present(np, "pins"))
goto parent;
group_names = devm_kcalloc(dev, 1, sizeof(*group_names), GFP_KERNEL);
if (!group_names)
return -ENOMEM;
ret = pinctrl_generic_pins_function_dt_subnode_to_map(pctldev, np, np,
maps, num_maps,
&num_reserved_maps,
group_names,
ngroups);
if (ret) {
pinctrl_utils_free_map(pctldev, *maps, *num_maps);
return dev_err_probe(dev, ret, "error figuring out mappings for %s\n", np->name);
}
ret = pinmux_generic_add_function(pctldev, np->name, group_names, 1, NULL);
if (ret < 0) {
pinctrl_utils_free_map(pctldev, *maps, *num_maps);
return dev_err_probe(dev, ret, "error adding function %s\n", np->name);
}
return 0;
parent:
for_each_available_child_of_node(np, child_np)
ngroups += 1;
group_names = devm_kcalloc(dev, ngroups, sizeof(*group_names), GFP_KERNEL);
if (!group_names)
return -ENOMEM;
ngroups = 0;
for_each_available_child_of_node_scoped(np, child_np) {
ret = pinctrl_generic_pins_function_dt_subnode_to_map(pctldev, np, child_np,
maps, num_maps,
&num_reserved_maps,
group_names,
ngroups);
if (ret) {
pinctrl_utils_free_map(pctldev, *maps, *num_maps);
return dev_err_probe(dev, ret, "error figuring out mappings for %s\n",
np->name);
}
ngroups++;
}
ret = pinmux_generic_add_function(pctldev, np->name, group_names, ngroups, NULL);
if (ret < 0) {
pinctrl_utils_free_map(pctldev, *maps, *num_maps);
return dev_err_probe(dev, ret, "error adding function %s\n", np->name);
}
return 0;
}
EXPORT_SYMBOL_GPL(pinctrl_generic_pins_function_dt_node_to_map);
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