pinctrl: abx500: Add device tree support

We use the same way to define pin muxing and pin configuration
than for nomadik. So pickup code from pinctrl_nomadik.c to be
able to implement pin multiplexing and pin configuration using
the device tree. Pin configuration uses generic parsing code.

Signed-off-by: Gabriel Fernandez <gabriel.fernandez@st.com>
Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Patrice Chotard 2013-06-20 16:04:59 +02:00 committed by Linus Walleij
parent 3a8d63d4b4
commit 64a45c9863
2 changed files with 536 additions and 0 deletions

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@ -0,0 +1,352 @@
ST Ericsson abx500 pinmux controller
Required properties:
- compatible: "stericsson,ab8500-gpio", "stericsson,ab8540-gpio",
"stericsson,ab8505-gpio", "stericsson,ab9540-gpio",
Please refer to pinctrl-bindings.txt in this directory for details of the
common pinctrl bindings used by client devices, including the meaning of the
phrase "pin configuration node".
ST Ericsson's pin configuration nodes act as a container for an arbitrary number of
subnodes. Each of these subnodes represents some desired configuration for a
pin, a group, or a list of pins or groups. This configuration can include the
mux function to select on those pin(s)/group(s), and various pin configuration
parameters, such as input, output, pull up, pull down...
The name of each subnode is not important; all subnodes should be enumerated
and processed purely based on their content.
Required subnode-properties:
- ste,pins : An array of strings. Each string contains the name of a pin or
group.
Optional subnode-properties:
- ste,function: A string containing the name of the function to mux to the
pin or group.
- generic pin configuration option to use. Example :
default_cfg {
ste,pins = "GPIO1";
bias-disable;
};
- ste,config: Handle of pin configuration node containing the generic
pinconfig options to use, as described in pinctrl-bindings.txt in
this directory. Example :
pcfg_bias_disable: pcfg_bias_disable {
bias-disable;
};
default_cfg {
ste,pins = "GPIO1";
ste.config = <&pcfg_bias_disable>;
};
Example board file extract:
&pinctrl_abx500 {
pinctrl-names = "default";
pinctrl-0 = <&sysclkreq2_default_mode>, <&sysclkreq3_default_mode>, <&gpio3_default_mode>, <&sysclkreq6_default_mode>, <&pwmout1_default_mode>, <&pwmout2_default_mode>, <&pwmout3_default_mode>, <&adi1_default_mode>, <&dmic12_default_mode>, <&dmic34_default_mode>, <&dmic56_default_mode>, <&sysclkreq5_default_mode>, <&batremn_default_mode>, <&service_default_mode>, <&pwrctrl0_default_mode>, <&pwrctrl1_default_mode>, <&pwmextvibra1_default_mode>, <&pwmextvibra2_default_mode>, <&gpio51_default_mode>, <&gpio52_default_mode>, <&gpio53_default_mode>, <&gpio54_default_mode>, <&pdmclkdat_default_mode>;
sysclkreq2 {
sysclkreq2_default_mode: sysclkreq2_default {
default_mux {
ste,function = "sysclkreq";
ste,pins = "sysclkreq2_d_1";
};
default_cfg {
ste,pins = "GPIO1";
bias-disable;
};
};
};
sysclkreq3 {
sysclkreq3_default_mode: sysclkreq3_default {
default_mux {
ste,function = "sysclkreq";
ste,pins = "sysclkreq3_d_1";
};
default_cfg {
ste,pins = "GPIO2";
output-low;
};
};
};
gpio3 {
gpio3_default_mode: gpio3_default {
default_mux {
ste,function = "gpio";
ste,pins = "gpio3_a_1";
};
default_cfg {
ste,pins = "GPIO3";
output-low;
};
};
};
sysclkreq6 {
sysclkreq6_default_mode: sysclkreq6_default {
default_mux {
ste,function = "sysclkreq";
ste,pins = "sysclkreq6_d_1";
};
default_cfg {
ste,pins = "GPIO4";
bias-disable;
};
};
};
pwmout1 {
pwmout1_default_mode: pwmout1_default {
default_mux {
ste,function = "pwmout";
ste,pins = "pwmout1_d_1";
};
default_cfg {
ste,pins = "GPIO14";
output-low;
};
};
};
pwmout2 {
pwmout2_default_mode: pwmout2_default {
pwmout2_default_mux {
ste,function = "pwmout";
ste,pins = "pwmout2_d_1";
};
pwmout2_default_cfg {
ste,pins = "GPIO15";
output-low;
};
};
};
pwmout3 {
pwmout3_default_mode: pwmout3_default {
pwmout3_default_mux {
ste,function = "pwmout";
ste,pins = "pwmout3_d_1";
};
pwmout3_default_cfg {
ste,pins = "GPIO16";
output-low;
};
};
};
adi1 {
adi1_default_mode: adi1_default {
adi1_default_mux {
ste,function = "adi1";
ste,pins = "adi1_d_1";
};
adi1_default_cfg1 {
ste,pins = "GPIO17","GPIO19","GPIO20";
bias-disable;
};
adi1_default_cfg2 {
ste,pins = "GPIO18";
output-low;
};
};
};
dmic12 {
dmic12_default_mode: dmic12_default {
dmic12_default_mux {
ste,function = "dmic";
ste,pins = "dmic12_d_1";
};
dmic12_default_cfg1 {
ste,pins = "GPIO27";
output-low;
};
dmic12_default_cfg2 {
ste,pins = "GPIO28";
bias-disable;
};
};
};
dmic34 {
dmic34_default_mode: dmic34_default {
dmic34_default_mux {
ste,function = "dmic";
ste,pins = "dmic34_d_1";
};
dmic34_default_cfg1 {
ste,pins = "GPIO29";
output-low;
};
dmic34_default_cfg2 {
ste,pins = "GPIO30";
bias-disable;{
};
};
};
dmic56 {
dmic56_default_mode: dmic56_default {
dmic56_default_mux {
ste,function = "dmic";
ste,pins = "dmic56_d_1";
};
dmic56_default_cfg1 {
ste,pins = "GPIO31";
output-low;
};
dmic56_default_cfg2 {
ste,pins = "GPIO32";
bias-disable;
};
};
};
sysclkreq5 {
sysclkreq5_default_mode: sysclkreq5_default {
sysclkreq5_default_mux {
ste,function = "sysclkreq";
ste,pins = "sysclkreq5_d_1";
};
sysclkreq5_default_cfg {
ste,pins = "GPIO42";
output-low;
};
};
};
batremn {
batremn_default_mode: batremn_default {
batremn_default_mux {
ste,function = "batremn";
ste,pins = "batremn_d_1";
};
batremn_default_cfg {
ste,pins = "GPIO43";
bias-disable;
};
};
};
service {
service_default_mode: service_default {
service_default_mux {
ste,function = "service";
ste,pins = "service_d_1";
};
service_default_cfg {
ste,pins = "GPIO44";
bias-disable;
};
};
};
pwrctrl0 {
pwrctrl0_default_mux: pwrctrl0_mux {
pwrctrl0_default_mux {
ste,function = "pwrctrl";
ste,pins = "pwrctrl0_d_1";
};
};
pwrctrl0_default_mode: pwrctrl0_default {
pwrctrl0_default_cfg {
ste,pins = "GPIO45";
bias-disable;
};
};
};
pwrctrl1 {
pwrctrl1_default_mux: pwrctrl1_mux {
pwrctrl1_default_mux {
ste,function = "pwrctrl";
ste,pins = "pwrctrl1_d_1";
};
};
pwrctrl1_default_mode: pwrctrl1_default {
pwrctrl1_default_cfg {
ste,pins = "GPIO46";
bias-disable;
};
};
};
pwmextvibra1 {
pwmextvibra1_default_mode: pwmextvibra1_default {
pwmextvibra1_default_mux {
ste,function = "pwmextvibra";
ste,pins = "pwmextvibra1_d_1";
};
pwmextvibra1_default_cfg {
ste,pins = "GPIO47";
bias-disable;
};
};
};
pwmextvibra2 {
pwmextvibra2_default_mode: pwmextvibra2_default {
pwmextvibra2_default_mux {
ste,function = "pwmextvibra";
ste,pins = "pwmextvibra2_d_1";
};
pwmextvibra1_default_cfg {
ste,pins = "GPIO48";
bias-disable;
};
};
};
gpio51 {
gpio51_default_mode: gpio51_default {
gpio51_default_mux {
ste,function = "gpio";
ste,pins = "gpio51_a_1";
};
gpio51_default_cfg {
ste,pins = "GPIO51";
output-low;
};
};
};
gpio52 {
gpio52_default_mode: gpio52_default {
gpio52_default_mux {
ste,function = "gpio";
ste,pins = "gpio52_a_1";
};
gpio52_default_cfg {
ste,pins = "GPIO52";
bias-pull-down;
};
};
};
gpio53 {
gpio53_default_mode: gpio53_default {
gpio53_default_mux {
ste,function = "gpio";
ste,pins = "gpio53_a_1";
};
gpio53_default_cfg {
ste,pins = "GPIO53";
bias-pull-down;
};
};
};
gpio54 {
gpio54_default_mode: gpio54_default {
gpio54_default_mux {
ste,function = "gpio";
ste,pins = "gpio54_a_1";
};
gpio54_default_cfg {
ste,pins = "GPIO54";
output-low;
};
};
};
pdmclkdat {
pdmclkdat_default_mode: pdmclkdat_default {
pdmclkdat_default_mux {
ste,function = "pdm";
ste,pins = "pdmclkdat_d_1";
};
pdmclkdat_default_cfg {
ste,pins = "GPIO55", "GPIO56";
bias-disable;
};
};
};
};

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@ -30,8 +30,10 @@
#include <linux/pinctrl/pinmux.h>
#include <linux/pinctrl/pinconf.h>
#include <linux/pinctrl/pinconf-generic.h>
#include <linux/pinctrl/machine.h>
#include "pinctrl-abx500.h"
#include "pinconf.h"
/*
* The AB9540 and AB8540 GPIO support are extended versions
@ -757,11 +759,193 @@ static void abx500_pin_dbg_show(struct pinctrl_dev *pctldev,
chip->base + offset - 1);
}
static void abx500_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_PIN)
kfree(map[i].data.configs.configs);
kfree(map);
}
static int abx500_dt_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 abx500_dt_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 abx500_dt_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_PIN;
(*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 const char *abx500_find_pin_name(struct pinctrl_dev *pctldev,
const char *pin_name)
{
int i, pin_number;
struct abx500_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
if (sscanf((char *)pin_name, "GPIO%d", &pin_number) == 1)
for (i = 0; i < npct->soc->npins; i++)
if (npct->soc->pins[i].number == pin_number)
return npct->soc->pins[i].name;
return NULL;
}
static int abx500_dt_subnode_to_map(struct pinctrl_dev *pctldev,
struct device_node *np,
struct pinctrl_map **map,
unsigned *reserved_maps,
unsigned *num_maps)
{
int ret;
const char *function = NULL;
unsigned long *configs;
unsigned int nconfigs = 0;
bool has_config = 0;
unsigned reserve = 0;
struct property *prop;
const char *group, *gpio_name;
struct device_node *np_config;
ret = of_property_read_string(np, "ste,function", &function);
if (ret >= 0)
reserve = 1;
ret = pinconf_generic_parse_dt_config(np, &configs, &nconfigs);
if (nconfigs)
has_config = 1;
np_config = of_parse_phandle(np, "ste,config", 0);
if (np_config) {
ret = pinconf_generic_parse_dt_config(np_config, &configs,
&nconfigs);
if (ret)
goto exit;
has_config |= nconfigs;
}
ret = of_property_count_strings(np, "ste,pins");
if (ret < 0)
goto exit;
if (has_config)
reserve++;
reserve *= ret;
ret = abx500_dt_reserve_map(map, reserved_maps, num_maps, reserve);
if (ret < 0)
goto exit;
of_property_for_each_string(np, "ste,pins", prop, group) {
if (function) {
ret = abx500_dt_add_map_mux(map, reserved_maps,
num_maps, group, function);
if (ret < 0)
goto exit;
}
if (has_config) {
gpio_name = abx500_find_pin_name(pctldev, group);
ret = abx500_dt_add_map_configs(map, reserved_maps,
num_maps, gpio_name, configs, 1);
if (ret < 0)
goto exit;
}
}
exit:
return ret;
}
static int abx500_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 = abx500_dt_subnode_to_map(pctldev, np, map,
&reserved_maps, num_maps);
if (ret < 0) {
abx500_dt_free_map(pctldev, *map, *num_maps);
return ret;
}
}
return 0;
}
static const struct pinctrl_ops abx500_pinctrl_ops = {
.get_groups_count = abx500_get_groups_cnt,
.get_group_name = abx500_get_group_name,
.get_group_pins = abx500_get_group_pins,
.pin_dbg_show = abx500_pin_dbg_show,
.dt_node_to_map = abx500_dt_node_to_map,
.dt_free_map = abx500_dt_free_map,
};
static int abx500_pin_config_get(struct pinctrl_dev *pctldev,