pinctrl: tegra: Add complete device tree support
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@nvidia.com> Acked-by: Dong Aisheng <dong.aisheng@linaro.org> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Stephen Warren
Linus Walleij
parent
a3c9454e53
commit
60f7f5003d
|
|
@ -23,9 +23,11 @@
|
|||
#include <linux/io.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/of_device.h>
|
||||
#include <linux/pinctrl/machine.h>
|
||||
#include <linux/pinctrl/pinctrl.h>
|
||||
#include <linux/pinctrl/pinmux.h>
|
||||
#include <linux/pinctrl/pinconf.h>
|
||||
#include <linux/slab.h>
|
||||
|
||||
#include <mach/pinconf-tegra.h>
|
||||
|
||||
|
|
@ -88,11 +90,214 @@ static void tegra_pinctrl_pin_dbg_show(struct pinctrl_dev *pctldev,
|
|||
seq_printf(s, " " DRIVER_NAME);
|
||||
}
|
||||
|
||||
static int reserve_map(struct pinctrl_map **map, unsigned *reserved_maps,
|
||||
unsigned *num_maps, unsigned reserve)
|
||||
{
|
||||
unsigned old_num = *reserved_maps;
|
||||
unsigned new_num = *num_maps + reserve;
|
||||
struct pinctrl_map *new_map;
|
||||
|
||||
if (old_num >= new_num)
|
||||
return 0;
|
||||
|
||||
new_map = krealloc(*map, sizeof(*new_map) * new_num, GFP_KERNEL);
|
||||
if (!new_map)
|
||||
return -ENOMEM;
|
||||
|
||||
memset(new_map + old_num, 0, (new_num - old_num) * sizeof(*new_map));
|
||||
|
||||
*map = new_map;
|
||||
*reserved_maps = new_num;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int add_map_mux(struct pinctrl_map **map, unsigned *reserved_maps,
|
||||
unsigned *num_maps, const char *group,
|
||||
const char *function)
|
||||
{
|
||||
if (*num_maps == *reserved_maps)
|
||||
return -ENOSPC;
|
||||
|
||||
(*map)[*num_maps].type = PIN_MAP_TYPE_MUX_GROUP;
|
||||
(*map)[*num_maps].data.mux.group = group;
|
||||
(*map)[*num_maps].data.mux.function = function;
|
||||
(*num_maps)++;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int add_map_configs(struct pinctrl_map **map, unsigned *reserved_maps,
|
||||
unsigned *num_maps, const char *group,
|
||||
unsigned long *configs, unsigned num_configs)
|
||||
{
|
||||
unsigned long *dup_configs;
|
||||
|
||||
if (*num_maps == *reserved_maps)
|
||||
return -ENOSPC;
|
||||
|
||||
dup_configs = kmemdup(configs, num_configs * sizeof(*dup_configs),
|
||||
GFP_KERNEL);
|
||||
if (!dup_configs)
|
||||
return -ENOMEM;
|
||||
|
||||
(*map)[*num_maps].type = PIN_MAP_TYPE_CONFIGS_GROUP;
|
||||
(*map)[*num_maps].data.configs.group_or_pin = group;
|
||||
(*map)[*num_maps].data.configs.configs = dup_configs;
|
||||
(*map)[*num_maps].data.configs.num_configs = num_configs;
|
||||
(*num_maps)++;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int add_config(unsigned long **configs, unsigned *num_configs,
|
||||
unsigned long config)
|
||||
{
|
||||
unsigned old_num = *num_configs;
|
||||
unsigned new_num = old_num + 1;
|
||||
unsigned long *new_configs;
|
||||
|
||||
new_configs = krealloc(*configs, sizeof(*new_configs) * new_num,
|
||||
GFP_KERNEL);
|
||||
if (!new_configs)
|
||||
return -ENOMEM;
|
||||
|
||||
new_configs[old_num] = config;
|
||||
|
||||
*configs = new_configs;
|
||||
*num_configs = new_num;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
void tegra_pinctrl_dt_free_map(struct pinctrl_dev *pctldev,
|
||||
struct pinctrl_map *map, unsigned num_maps)
|
||||
{
|
||||
int i;
|
||||
|
||||
for (i = 0; i < num_maps; i++)
|
||||
if (map[i].type == PIN_MAP_TYPE_CONFIGS_GROUP)
|
||||
kfree(map[i].data.configs.configs);
|
||||
|
||||
kfree(map);
|
||||
}
|
||||
|
||||
static const struct cfg_param {
|
||||
const char *property;
|
||||
enum tegra_pinconf_param param;
|
||||
} cfg_params[] = {
|
||||
{"nvidia,pull", TEGRA_PINCONF_PARAM_PULL},
|
||||
{"nvidia,tristate", TEGRA_PINCONF_PARAM_TRISTATE},
|
||||
{"nvidia,enable-input", TEGRA_PINCONF_PARAM_ENABLE_INPUT},
|
||||
{"nvidia,open-drain", TEGRA_PINCONF_PARAM_OPEN_DRAIN},
|
||||
{"nvidia,lock", TEGRA_PINCONF_PARAM_LOCK},
|
||||
{"nvidia,io-reset", TEGRA_PINCONF_PARAM_IORESET},
|
||||
{"nvidia,high-speed-mode", TEGRA_PINCONF_PARAM_HIGH_SPEED_MODE},
|
||||
{"nvidia,schmitt", TEGRA_PINCONF_PARAM_SCHMITT},
|
||||
{"nvidia,low-power-mode", TEGRA_PINCONF_PARAM_LOW_POWER_MODE},
|
||||
{"nvidia,pull-down-strength", TEGRA_PINCONF_PARAM_DRIVE_DOWN_STRENGTH},
|
||||
{"nvidia,pull-up-strength", TEGRA_PINCONF_PARAM_DRIVE_UP_STRENGTH},
|
||||
{"nvidia,slew-rate-falling", TEGRA_PINCONF_PARAM_SLEW_RATE_FALLING},
|
||||
{"nvidia,slew-rate-rising", TEGRA_PINCONF_PARAM_SLEW_RATE_RISING},
|
||||
};
|
||||
|
||||
int tegra_pinctrl_dt_subnode_to_map(struct device_node *np,
|
||||
struct pinctrl_map **map,
|
||||
unsigned *reserved_maps,
|
||||
unsigned *num_maps)
|
||||
{
|
||||
int ret, i;
|
||||
const char *function;
|
||||
u32 val;
|
||||
unsigned long config;
|
||||
unsigned long *configs = NULL;
|
||||
unsigned num_configs = 0;
|
||||
unsigned reserve;
|
||||
struct property *prop;
|
||||
const char *group;
|
||||
|
||||
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 exit;
|
||||
}
|
||||
}
|
||||
|
||||
reserve = 0;
|
||||
if (function != NULL)
|
||||
reserve++;
|
||||
if (num_configs)
|
||||
reserve++;
|
||||
ret = of_property_count_strings(np, "nvidia,pins");
|
||||
if (ret < 0)
|
||||
goto exit;
|
||||
reserve *= ret;
|
||||
|
||||
ret = reserve_map(map, reserved_maps, num_maps, reserve);
|
||||
if (ret < 0)
|
||||
goto exit;
|
||||
|
||||
of_property_for_each_string(np, "nvidia,pins", prop, group) {
|
||||
if (function) {
|
||||
ret = add_map_mux(map, reserved_maps, num_maps,
|
||||
group, function);
|
||||
if (ret < 0)
|
||||
goto exit;
|
||||
}
|
||||
|
||||
if (num_configs) {
|
||||
ret = add_map_configs(map, reserved_maps, num_maps,
|
||||
group, configs, num_configs);
|
||||
if (ret < 0)
|
||||
goto exit;
|
||||
}
|
||||
}
|
||||
|
||||
ret = 0;
|
||||
|
||||
exit:
|
||||
kfree(configs);
|
||||
return ret;
|
||||
}
|
||||
|
||||
int tegra_pinctrl_dt_node_to_map(struct pinctrl_dev *pctldev,
|
||||
struct device_node *np_config,
|
||||
struct pinctrl_map **map, unsigned *num_maps)
|
||||
{
|
||||
unsigned reserved_maps;
|
||||
struct device_node *np;
|
||||
int ret;
|
||||
|
||||
reserved_maps = 0;
|
||||
*map = NULL;
|
||||
*num_maps = 0;
|
||||
|
||||
for_each_child_of_node(np_config, np) {
|
||||
ret = tegra_pinctrl_dt_subnode_to_map(np, map, &reserved_maps,
|
||||
num_maps);
|
||||
if (ret < 0) {
|
||||
tegra_pinctrl_dt_free_map(pctldev, *map, *num_maps);
|
||||
return ret;
|
||||
}
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct pinctrl_ops tegra_pinctrl_ops = {
|
||||
.get_groups_count = tegra_pinctrl_get_groups_count,
|
||||
.get_group_name = tegra_pinctrl_get_group_name,
|
||||
.get_group_pins = tegra_pinctrl_get_group_pins,
|
||||
.pin_dbg_show = tegra_pinctrl_pin_dbg_show,
|
||||
.dt_node_to_map = tegra_pinctrl_dt_node_to_map,
|
||||
.dt_free_map = tegra_pinctrl_dt_free_map,
|
||||
};
|
||||
|
||||
static int tegra_pinctrl_get_funcs_count(struct pinctrl_dev *pctldev)
|
||||
|
|
|
|||
Loading…
Reference in New Issue